IMR Press / RCM / Volume 23 / Issue 2 / DOI: 10.31083/j.rcm2302060
Open Access Review
Natural products from traditional Chinese medicine for the prevention and treatment of heart failure: progress and perspectives
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1 Department of Cardiology, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, 310006 Hangzhou, Zhejiang, China
2 Translational Medicine Research Center, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, 310006 Hangzhou, Zhejiang, China
3 Zhejiang Chinese Medical University, 310053 Hangzhou, Zhejiang, China
4 Pharmaceutical Informatics Institute, College of Pharmaceutical Sciences, Zhejiang University, 310009 Hangzhou, Zhejiang, China
*Correspondence: (Yizhou Xu); (Yigang Zhong)
These authors contributed equally.
Academic Editors: Brian Tomlinson and Takatoshi Kasai
Rev. Cardiovasc. Med. 2022 , 23(2), 60;
Submitted: 29 October 2021 | Revised: 19 December 2021 | Accepted: 20 December 2021 | Published: 12 February 2022
(This article belongs to the Special Issue State-of-the-Art Cardiovascular Medicine in Asia 2021)
Copyright: © 2022 The Author(s). Published by IMR Press.
This is an open access article under the CC BY 4.0 license.

Heart failure (HF) is the end stage of several cardiovascular diseases with high mortality worldwide; however, current chemical drugs have not beneficial effect on reducing its mortality rate. Due to its properties of multiple targets components with multiple targets, natural products derived from traditional Chinese medicine (TCM) have exerts unique effects on the amelioration of the clinical symptoms of HF, yet, TCM is not widely used in the clinic since the potential therapeutic targets have not been fully investigated. Therefore, in this review, we briefly summarized the pathophysiological mechanism of HF and reviewed the published clinical evaluations of TCM and natural products from Chinese herbs to treat HF. Then, the therapeutic potential and the underlying mechanisms by which the natural products from Chinese herb exert their protective effects were further summarized. We concluded from this review that natural products from Chinese herbs have been shown to be more effective in treating HF by targeting multiple signaling pathways, including anticardiac hypertrophy, antifibrotic, anti-inflammatory, antioxidative and antiapoptotic activities. However, the major limitations of these compounds is that there are a lack of large scale, multicenter, randomized and controlled clinical trials for their use in treatment of HF, and the toxic effects of natural products from Chinese herbs also needed further investigation. Despite these limitations, further clinical trials and experimental studies will provide a better understanding of the mechanism of natural products from Chinese herbs and promote their wide use to treat HF.

Natural products
Chinese herb
Heart failure
Cardiac hypertrophy
Oxidative stress
Myocardial apoptosis
1. Introduction

Heart failure (HF) is a complicated syndrome in which ventricle filling or ejection is impaired due to structural or functional cardiac disorders [1]. Globally, there are more than 37.7 million individuals with HF, and almost 50% of HF patients die within 5 years after diagnosis; thus, the mortality rate of HF exceeds that of many cancers [2]. From a population-based study reported in 2021, the age-standardized prevalence and incidence of HF were 1.10% (an estimated 15 million HF patients) in China [3]. According to treatment guidelines, the main drugs used to treat HF in the clinic are angiotensin receptor blockers (ARBs) and mineralocorticoid receptor antagonists (MRAs). Although there has been a significant improvement in the number of hospital admissions, the 5-year mortality has not been reduced [4]. Indeed, there are some novel drugs used to treat HF in clinical trials, such as vericiguat (an oral soluble guanylate cyclase stimulator) [5], finerenone (a third-generation mineralocorticoid receptor antagonist) [6, 7] and ferric carboxymaltose [8], however, not all of them have an apparent effect on the risk of cardiovascular death. According to one Phase IIb trial, finerenone had a beneficial effect on reducing HF mortality, however, whether the high occurrence of malignant arrhythmia and hyperkalemia caused by finerenonen still needs to be further verified [7]. Moreover, prolonged use of the above mentioned chemical drugs may result in severe side effects, such as electrolyte depletion and hypotension [9]. Therefore, natural products from Chinese herbs have been considered an alternative therapeutic strategy for the treatment of HF that is less expensive and associated with fewer side effects.

Chinese herbs have been used as complementary therapy to treat HF for a long history [10]. Traditional Chinese medicine (TCM) combined with Western medicine treatment has been shown to improve the quality of life of HF patients [11]. In China, there are many patent Chinese drugs (where the active ingredients were extracted from these herbs and made into the form of capsules, pills or injections by modern therapeutic techniques) and Chinese formulae (several herbs in different amounts are prescribed together by physicians and boiled and concentrated using a rotary evaporator according to the Standard Operation Procedure of the Chinese Pharmacopoeia) used to treat patients with HF; however, their mechanisms of action, complex pharmacokinetics and therapeutic targets have not been fully investigated. Therefore, TCM is often criticized or even rejected by Western scientists. In this review, we will summarize the pathogenesis of HF and clinically evaluate common Chinese formulae and patent Chinese drugs. Furthermore, putative molecular mechanism of these natural products of traditional Chinese medicine will also be reviewed with respect to current research surrounding their use in treating HF.

2. Pathophysiology of HF

HF is characterized by a decrease in cardiac output. According to the guidelines of American College of Cardiology Foundation (ACCF)/American Heart Association (AHA), HF with reduced ejection fraction (HFrEF) is defined as an ejection fraction 40%, whereas HF with preserved ejection fraction (HFpEF) is defined as an ejection fraction 50% and HF with mid-range ejection fraction (HFmrEF) is defined as an ejection fraction between 41% and 49% [12]. Although the diagnosis of HFrEF, HFmrEF, and HFpEF is different, they can all lead to heart dysfunction by causing structural changes to the myocardium and activating multiple molecular signaling pathway-related processes, such as cardiomyocyte hypertrophy, endothelial dysfunction, oxidative stress, interstitial fibrosis and cardiac inflammation [13, 14]. However, some of the mechanisms of HF development remain unclear, as few therapeutic approaches can significantly decrease the mortality of HF patients in the clinic [1]. Therefore, an improved investigation of the pathophysiological mechanisms of HF will be beneficial to evaluate and manage HF patients and provide novel therapeutic strategies to improve clinical outcomes.

2.1 Cardiomyocyte hypertrophy

During HF, the heart usually increases in size, which results in pathological cardiac hypertrophy. Pathological hypertrophy is characterized by contractile dysfunction and causes cardiac structural remodeling [15]. According to a previous study, calcium abnormalities and changes in gene expression play important roles in the development of cardiac hypertrophy [16] (Fig. 1).

Fig. 1.

A schematic of the major signaling pathways involved in cardiac hypertrophy, impaired antioxidant systems and fibrosis progression in the failing heart. First, calcium homeostasis imbalance is induced by multiple channels. The release of Ca2+ from the sarcoplasmic reticulum (SR) is accelerated by inactivation of sarcoendoplasmic reticulum calcium ATPase (SERCA2a) and the phosphorylation of type 2 ryanodine receptors (RyR2). The density of L-type Ca2+ channels (LTCCs) is reduced to decrease Ca2+ entry into the cytoplasm. The activity of Na+/Ca2+ exchanger (NCX) is enhanced, which pumps Ca2+ out of the cell. On the other hand, increased angiotensin II (Ang II), endothelin (ET)-1 and noradrenaline (NA) binding to G-protein-coupled receptors (GPCRs) induces the expression of hypertrophic genes, such as atrial natriuretic peptide (ANP), B-type natriuretic peptide (BNP) and β-myosin heavy chain (β-MHC). Second, reactive oxygen species (ROS) generation is also enhanced in HF due to impaired antioxidant capacity [superoxide dismutase (SOD)] and the increased activity of certain enzymes, such as NADPH oxidase (NOX), xanthine oxidase (XO), and uncoupled nitric oxide synthases (NOS). Finally, several signaling pathways are involved in fibrosis progression. Transforming growth factor β-1 (TGFβ-1) and certain proinflammatory cytokines, such as tumor necrosis factor-α (TNF-α), interleukin-1 (IL-1), IL-6, and IL-18, induce ECM protein gene expression and regulate fibrous tissue deposition.

Calcium homeostasis imbalance has been observed in HF and plays a major role in its progression [17]. There are two major receptors in the sarcoplasmic reticulum (SR) membrane, type 2 ryanodine receptor (RyR2) and sarcoendoplasmic reticulum calcium ATPase (SERCA), both of are involved in regulating Ca2+ homeostasis. In HF patients, it was reported that the expression and activity of SERCA2a is reduced which could reduce the amount of Ca2+ pumped back into the SR [18, 19]. On the other hand, phosphorylation of RyR2 is enhanced in the failing human heart, suggesting that Ca2+ leakage from the SR is accelerated in HF patients and can result in contractile dysfunction [20]. Although the precise mechanism of RyR2 phosphorylation is being still debated, it has been reported that RyR2 phosphorylation is enhanced by protein kinase A (PKA) andcalcium/calmodulin-dependent protein kinase II (CaMKII) [21]. Overexpression of CaMKII causes cardiac hypertrophy that rapidly transitions into HF [22], while CaMKII-KO mice are resistant to HF [23]. Therefore, specific CaMKII inhibition is a promising drug strategy for future studies. Finally, Ca2+ enters cardiomyocytes via L-type calcium channels (LTCCs) located within t-tubules; however, in the failing heart, the density of LTCCs is reduced [24]. Moreover, Na+/Ca2+ exchanger (NCX) activity is enhanced, which pumps Ca2+ out of the cell [25].

In addition to calcium abnormalities, the altered gene expression also contributes to the progression of cardiac hypertrophy [26]. For instance, some ligands, such as angiotensin (Ang) II, endothelin (ET)-1 and noradrenaline (NA), are closely associated with the progress of pathological cardiac hypertrophy. These ligands can bind with G-protein-coupled receptors (GPCRs) to activate downstream signaling molecules, including phospholipase C (PLC), Protein kinase C (PKC) and mitogen-activated protein kinases (MAPKs), and then induce the expression of certain hypertrophic genes, such as atrial natriuretic peptide (ANP), B-type natriuretic peptide (BNP) and β-myosin heavy chain (β-MHC) [27]. According to a previous study, Ang II is known to contribute to the pathogenesis of HF, and its expression was found to be increased in HF patients [28].

2.2 Oxidative stress

Oxidative stress, defined as the excessive generation of reactive oxygen species (ROS), has been shown to play a critical role in the pathophysiology of HF [29, 30]. Normally, ROS are constantly formed in cells and removed by the antioxidant defense system; however, this balance is disturbed in HF. First, antioxidant capacity is impaired in HF; for example, the activities of superoxide dismutase (SOD) and other catalases are decreased [29]. In addition, ROS generation is enhanced in HF due to increased activity of certain enzymes, including NADPH oxidase (NOX), xanthine oxidase (XO), and uncoupled nitric oxide synthases (NOS) [31]. Therefore, we believe that oxidative stress in HF is not only induced by the enhancement of ROS generation but also by the impairment of the antioxidant defense within the heart (Fig. 1).

When excessive ROS are produced, myocardial cell injury is induced via multiple mechanisms (Fig. 1). First, ROS can impair the contractile machinery of cardiomyocytes by modifying the proteins that bind to multiple ion channels, such as calcium, potassium, and sodium channels [32]. Second, ROS can lead to contractile dysfunction by reducing myofilament calcium sensitivity and inhibiting the activity of SERCA [32]. Third, increased ROS production inversely results in further mitochondrial and energy metabolism dysfunction [29]. Fourth, ROS induce cardiac fibroblast proliferation, resulting in extracellular remodeling. Finally, prolonged excessive ROS production could cause DNA damage and lead to cell damage and death.

2.3 Myocardial fibrosis

Cardiac fibrosis is characterized by the accumulation of extracellular matrix (ECM) in the myocardium and is an integral aspect of most pathological cardiac conditions, including HF [33]. In the healthy adult heart, cardiomyocytes are supported by ECM which is synthesized in cardiac fibroblasts. According to a previous study, the concentration of myocardial collagen increases by as much as 3- to 6-fold in HF patients [34]. Although the pathogenesis of cardiac fibrosis in HF has not been fully classified, there are two main related theories. One is that fibrotic changes are due to an accumulation of reactive collagen fibers in the interstitium and perivascular regions [35]. On the other hand, myocyte loss is suspected to stimulate replacement fibrosis to replace dead tissue. Finally, cardiac systolic and diastolic function are affected by collagen accumulation. A wide range of molecular signals are involved in this process (Fig. 1).

Transforming growth factor β-1 (TGFβ-1) is one of the most important growth factors in the development of cardiac fibrosis, and its expression has been found to be increased in HF patients [36]. Stimulation of TGFβ-1 induces the transformation of fibroblasts to myofibroblasts and enhances ECM production [37], while TGFβ-1 inhibition reverses these fibrotic effects [38]. When the TGFβ-1 pathway is activated, it can induce ECM protein and gene expression and regulate fibrous tissue deposition via the Smad2/3 signaling pathway [39]. In addition to inducing ECM protein synthesis, TGFβ-1 can also reduce collagen degradation by activating tissue inhibitors of metalloproteinases (TIMPs) [40]. Furthermore, proinflammatory cytokines are believed to play a physiological or pathological role in the development and progression of HF [41]. Increased circulating levels of tumor necrosis factor-α (TNF-α), interleukin-1 (IL-1), IL-6, and IL-18 have been reported in patients with chronic HF [42, 43]. These cytokines can stimulate increases in cardiac fibroblast migration and enhance fibroblast sphingosine kinase activity [44]. According to a previous study, overexpression of TNF-α in cardiomyocytes can result in HF, which is associated with increased collagen synthesis [45].

2.4 Inflammation

In HF, the innate and adaptive immune systems in the heart are activated (Fig. 2). At the beginning of myocardial injury, the innate immune system is activated to allow the heart to adapt to increased stress in the short term [46]. However, this inflammatory response can become dysregulated, resulting in activation of the expression of certain proinflammatory cytokines. According to a previous study, TNF-α and IL-6 are expressed in the failing heart [47]. TNF-α can bind to TNF receptor 1 (TNFR1) in the cell membrane to activate the NADPH oxidase (NOX) complex. The activated NOX complex converts extracellular O2 into O2- and induces oxidative stress [48]. Finally, TNF-induced ROS production contributes to apoptosis by inducing mitochondrial outer-membrane permeabilization (MOMP) and Jun N-terminal kinase (JNK) activation [49]. Therefore, TNF-α can activate multiple signaling pathways to affect cardiomyocytes. Regarding other cytokines, the expression levels of both IL-1α and IL-1β are upregulated in HF patients [50].

Fig. 2.

The innate and adaptive immune systems are activated in heart failure. Acute injury, such as ischemia, pressure, or volume overload, can induce the binding of certain proinflammatory cytokines (TNF-α and IL-1) to their receptors, which activates the nuclear factor-κB (NF-κB) signaling pathway to aggravate proinflammatory cytokine expression. These effects can also increase ROS production and lead to apoptosis. Finally, activation of the innate immune system triggers the activation of the adaptive immune response through the recruitment of immune cells, including macrophages, B cells, T cells and natural killer (NK) cells.

On the other hand, the adaptive immune system provides a highly specific response that is mediated by certain cellular components, such as activated T lymphocytes, macrophages and NK cells. These cells were observed to be increased in number in histological heart specimens from patients with chronic HF [51]. These activated macrophages, T cells and B cells can trigger a sustained inflammatory response by stimulating cytokine production, ultimately resulting in cytotoxicity and tissue injury [43].

2.5 Cardiomyocyte death

The loss of cardiomyocytes due to cell death, including apoptosis and necrosis, has been implicated in HF [52, 53], while inhibition of cardiomyocyte death has beneficial effects in the prevention of HF [54, 55]; therefore, blocking cardiomyocyte death may be a new potential approach for the HF treatment. It was reported that FasL is expressed in HF patients [56]; furthermore, suppression of FasL has beneficial antiapoptotic effects and reduces the risk of death in HF patients [57, 58]. On the other hand, the loss of mitochondrial cristae and destruction of the inner mitochondrial membrane were observed in vivo in animal models and in HF patients [59]. This process could mediate the cleavage of Bid and promote cytochrome c release. Finally, the induction of mitochondrial necrosis is triggered by the opening of the mitochondrial permeability transition pore (mPTP) due to Ca2+ influx. The loss of mitochondrial membrane potential and a decrease in ATP synthesis can result, eventually inducing necrotic cell death [60]. Moreover, inhibiting the opening of mPTP could attenuate myocardial necrosis induced by ischemia and oxidative stress [61].

3. Short summary of the progress of understanding HF pathophysiology

Considering the complex mechanisms of HF pathophysiology, it is clear that multiple signaling pathways and processes are involved in the induction of HF. More importantly, these processes do not function alone and are affected by each other. For instance, calcium abnormalities not only induce cardiomyocyte hypertrophy but also aggravate oxidative stress and increase ROS production. In addition, some proteins, such as Ang II and TNF-α, have multiple effects on inflammation, fibrosis, and even cardiomyocyte death. In the early stage, oxidative stress is induced by the increased activity of certain enzymes and impaired antioxidant capacity. During this phase, the contractile dysfunction of cardiac myocytes is triggered by calcium abnormalities. Then, in the following stage, fibrosis and inflammation are induced, resulting in an increase in oxidative stress. Next, increased cardiomyocyte hypertrophy, apoptosis, and fibrotic changes in the extracellular matrix lead to the microstructural reorganization of cardiomyocytes. Although remarkable progress has been made in interventional and surgical methods in recent decades, the mortality rate of HF has not been reduced. Therefore, an increased understanding of the pathophysiological mechanisms behind the development of HF will help us to find novel, optimized pharmacotherapeutic targets.

4. Natural products from Chinese herbs to treat HF

As mentioned above, Chinese herbs have been used for the effective management of HF for a long time. There are four different types of Chinese medicines that are being used in preclinical studies and in the clinic to treat HF, including TCM formulae, Chinese medicines, crude extracts of herbsand active components and compounds.

The herbs commonly used to treat HF are: Radix aconiti carmichaeli (Fuzi), Radix astragali (Huangqi), Panax ginseng (Renshen), Salvia miltiorrhiza (Danshen), etc. Chinese herbs have been successfully produced and made into the form of capsules, pills or injections, such as Qishenyiqi dripping pill (QSYQ), Danqi pill (DQP), Shengmai capsule, Shenmai injection, and Shengmai injection. On the other hand, several herbs in different proportions can be prescribed together. These decoctions prescribed by physicians include: Baoyuan tang, Fuzhengkangfu Decoction, Shengmai san, Xuefuzhuyu tang and Zhenwu tang, etc. Compared to herbal compounds, active components and compounds can easily be investigated by scientifically rigorous clinical evaluations and some have been approved by the Food and Drug Administration (FDA) [62]. The different types of Chinese medicine used in the clinic and their components and sources are listed in Table 1.

Table 1.Summary of the prescribed formulae and natural products from Chinese herbs used in clinical trials.
Medicine form Name Dosage form Prescription rights Source Major active compounds Target disease
TCM formula Baoyuan tang Decoction TCM Physicians Panax ginseng, Radix astragali, Glycyrrhiza uralensis, Cinnamomum cassia Astragaloside IV, Ginsenoside, etc. Coronary disease, Congestive heart failure
Danshen Yin Decoction TCM Physicians Salvia miltiorrhiza, Santalum album, Amomum villosum Tanshinone IIA, Salvianolic acid B, etc. Coronary disease
Fuzhengkangfu Decoction Decoction TCM Physicians Radix codonopsis, Radix saposhnikoviae, Rhizoma atractylodis macrocephalae, Poria, Radix morindae officinalis, Radix glycyrrhizae Tangshenoside, Trametenolic acid, Arachic acid, etc. Non small cell lung cancer, Heart failure
Shengmai San Decoction TCM Physicians Panax ginseng, Ophiopogon japonicas, Schisandra chinensis Ophiopogon saponin, Ginsenoside, etc. Coronary disease, Congestive heart failure
Taohongsiwu Tang Decoction TCM Physicians Angelica sinensis, Ligusticum chuanxiong, Paeonia lactiflora, Carthamus tinctorius, Radix rehmanniae preparata, Prunus persica Polysaccharide, Iridoids, Ligustrazine, Carthamin, Paeoniflorin, Amygdalin, etc. Coronary disease, Cerebral infarction
Xuefuzhuyu Decoction Decoction TCM Physicians Prunus persica, Angelica sinensis, Carthamus tinctorius, Radix paeoniae, Achyranthes bidentata, Ligusticum chuanxiong, Platycodon grandiflorus, Radix Bupleuri, Citrus aurantium, Rehmannia glutinosa, Glycyrrhiza uralensis Carthamin, Amygdalin,Paeoniflorin, Triterpene saponins, Lgustrazine, Saikoside, Iridoids, Umbellifera lactone, etc. Coronary disease, Congestive heart failure
Zhenwu Tang Decoction TCM Physicians Poria cocos, Paeonia lactiflora, Atractylodes macrocephala, Zingiber officinale Roscoe, Radix Praeparata Ganodericacid, Paeoniflorin, Atractylol, Zingiberol, etc. Cardiogenic edema heart failure
Chinese medicine Danqi Pill Guttate Pills Western medicine/TCM Physicians Salvia miltiorrhiza, Panax notoginseng, Borneol Borneol, Notoginsenoside Tanshinone IIA, etc. Coronary disease,Angina pectoris
Danhong Injection Injection Western medicine/TCM Physicians Salvia miltiorrhiza, Carthamus tinctorius Carthamin, Tanshinone IIA, etc. Coronary disease, Angina pectoris, Myocardial infarction
Qili Qiangxin Capsule Capsule Western medicine/TCM Physicians Radix astragali, Ginseng, Aconitum carmichaelii Debx, Salvia miltiorrhiza, Lepidium virginicum, Alisma orientalis, Polygonatum odoratum, Cinnamomum cassia Presl, Carthamus tinctorius , Periploca sepium , Citrus reticulata Blanco Astragaloside IV, Ginsenoside, Aconitine, Tanshinone IIA, Alisol, Carthamin, Cinnamaldehyde, Hesperidin, etc. Coronary disease, Congestive heart failure
Qishen Yiqi Dripping Pill (QSYQ) Guttate Pills Western medicine/ TCM Physicians Radix astragali, Salvia miltiorrhiza, Panax notoginseng, Dalbergia odorifera Astragaloside IV, Tanshinone IIA, Duartin, Ginsenoside, etc. Coronary disease, Angina pectoris
Shenmai Injection Injection TCM Physicians Panax ginseng, Ophiopogon japonicus Ginsenoside, Ophiopogonin, etc. Coronary disease, Viral myocarditis
Shengmai Injection Injection TCM Physicians Panax ginseng, Ophiopogon japonicas, Schisandra chinensis Ginsenoside, Ophiopogonin, Schizandrin, etc. Myocardial infarction,Chronic heart failure
Crude extract of herb Di’ao XinxuekangCapsule Capsule Western medicine/TCM Physicians Dioscorea panthaica Steroidal saponins Coronary disease, Chronic heart failure,
Huangqi Injection Injection TCM Physicians Radix astragali Astragaloside IV (AS-IV) Viral myocarditis
Active component and compound Adoniside Tablet Western medicine/TCM Physicians Adonis vernalis Adoniside Acute and chronic heart failure
Astragaloside IV (AS-IV) Tablet Western medicine/TCM Physicians Radix astragali Astragaloside IV(AS-IV) Chronic heart failure
Digitoxin Tablet/Injection Western medicine/TCM Physicians Digitalis lanata Digitoxin Coronary disease Chronic heart failure
Tanshinone IIA Injection TCM Physicians Salvia miltiorrhiza Tanshinone IIA Acute myocardial infarction, severe heart failure
Ibopamine Tablet Western medicine/TCM Physicians Plectranthus barbatus Ibopamine Heart failure
Ouabain Tablet Western medicine/TCM Physicians Strophanthus gratus Ouabain Coronary disease Congestive heart failure
5. Clinical evaluations of natural products from Chinese herbs

Although TCMs in China do not undergo the same rigorous testing procedures as Western drugs, a large number of randomized controlled trials were carried out to assess the efficacy of TCMs to treat HF. Some of these TCMs have already been put into clinical evaluations.

Di’ao Xinxuekang capsule is extracted from the rhizomes of Dioscorea panthaica. A randomized control trial showed that the proportion of angina pectoris patients was significantly reduced after 20 weeks of treatment with Di’ao Xinxuekang capsule [63]. Furthermore, a randomized clinical trial demonstrated that Di’ao Xinxuekang capsule seemed to have a better protective effect on HF patients than isosorbide dinitrate [64].

QSYQ, a patented Chinese prescription, has been applied for the integrative treatment of HF patients. A randomized clinical trial demonstrated that 12 months of QSYQ treatment had effects similar to those of aspirin for the treatment of myocardial infarction [65].

Qili qiangxin capsule was approved for the treatment of HF in 2004. It contains extract of 11 Chinese herbs, as shown in Table 1. In a clinical trial, N-terminal prohormone of brain natriuretic peptide (NT-proBNP) levels were downregulated by Qili qiangxin capsule and its performance was superior compared with the placebo [66].

Huangqi injection is an extract of Radix astragali that is also commonly used to treat chronic HF in the clinic. It was found that Huangqi injection has a beneficial effect on improving heart function, such as increased left ventricular ejection fraction (LVEF) and decreased stroke volume (SV) levels [67]. On the other hand, it was found that the expression levels of sIL-2R, IgG and IgA were reduced in congestive HF patients after Huangqi injection treatment which suggested that immune function was also rescued [68].

Shenmai injection is extracted from Panax ginseng. A double-blind, multicenter study showed that the Shenmai injection group demonstrated a significant improvement in heart function compared with the placebo group [69]. On the other hand, Shenmai injection also improved left ventricular diastolic function (LVDF) in chronic HF patients [70]. Finally, Shenmai injectionreduced the expression levels of plasma neuropeptide Y (NPY), endothelin (ET) and atrial natriuretic polypeptide (ANP) to improve the cardiac function in HF patient [71].

Shengmai injection is extracted from Panax ginseng, Ophiopogon japonicas and Schisandra chinensis. It was reported that Shengmai injection could improve heart function in HF patients and inhibit myocardial cell apoptosis by reducing the death receptor of soluble tumor necrosis factor related apoptosis inducing ligand (TRAIL) [72]. The levels of plasma P-selectin, von Willebrand factor (vWF) and D-dimer in HF patients were also reduced after Shengmai injection which suggests that cardiac function was improved [73].

Digitoxin, a traditional Chinese medicine monomer extracted from Digitalis lanata Ehrh (Maohua Yangdihua) has been commonly applied in the treatment of HF patients. Several double-blind placebo-controlled trials have proven the efficacy of digoxin in the treatment of HF [74, 75, 76]. From the PROVED trial, a significant worsening of exercise duration occurred in patients on placebo medication when compared with the digoxin group. Moreover, the left ventricular ejection fraction was increased in the digoxin group and decreased in the placebo group [74]. A randomized, placebo-controlled clinical trial enrolled 3505 patients and revealed that digitoxin could reduce the risks of mortality and hospital admission for HF patients [75]. On the other hand, it was shown that the differences in chronic HF scores during the digoxin and digitoxin periods were not significant [76]. In addition to digitoxin, other natural products extracted from Digitalis lanata, including lanatoside A/C, were used to treat HF in clinical trials [77, 78].

Tanshinone IIA is a potent pharmacological compound extracted from Salvia miltiorrhiza (Danshen). Tanshinone IIA has a similar therapeutic effect on myocardial infarction as alprostadil; however, the cardiac functions of all patients who were treated with Tanshinone IIA injection were significantly improved [79]. As a derivative of Tanshinone IIA, sodium Tanshinone IIA sulfonate (STS) also has a cardioprotective effect. In a randomized clinical trial, 101 myocardial infarction patients were immediately assigned to receive STS or saline control, and 6-months of treatment with STS inhibited the damage to the infarcted myocardium by significantly reducing the level of neutrophils [80].

Astragaloside IV(AS-IV) is the main component of Radix Astragali (Huangqi) which is widely used among patients with chronic HF in the clinic [81]. Alleviation was shown in 15 congestive heart failure patients, and their exercise capability was reinforced after AS-IV injection [82]; however, there have been no direct clinical trials to explore the cardioprotective effect of adoniside.

Ibopamine is extracted from Plectranthus barbatus. A double-blind placebo-controlled study showed that ibopamine inhibited neurohumoral activation in patients with mild to moderate chronic HF [83].

6. The mechanisms by which natural products from Chinese herbs treat HF

The pharmacological mechanisms by which these natural products treat HF have been explored in numerous studies [84]. Experimental studies have demonstrated that natural products from Chinese herbs have anticardiac hypertrophy, antioxidant, antifibrotic, antiinflammatory and antiapoptotic properties (Table 2, Ref. [85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135]). As discussed above, these biological pathways are interconnected, and these natural products may function in a multicomponent and multitarget manner.

Table 2.The mechanisms by which the natural products from Chinese herbs treat HF.
Property Natural products Targets or pathways Type of study References
Inhibiting hypertrophy Zhenwu Tang p-ERK1/2↓, p-p38↓, p-JNK↓ and BNP↓ Constricting the abdominal aorta in Rat [85, 86]
Danhong injection p38 and NF-κb pathway↓→ANP and BNP↓ ISO in H9C2 and rat [87]
Shengmai injection AMPK signaling pathway↑ Angiotensin II in primary cardiomyocyte [88]
Digitoxin Na+/Ca2+ exchanger levels↑, SERCA2↑ Coronary artery ligation in rats [89]
Tanshinone IIA Voltage-gated Ca2+ channels↓ Systolic blood pressure in rat [90]
Store-operated Ca2+channels (SOCC) Hypoxia in smooth muscle cells [91]
MAPKs and IGF-2R pathway ↓ Angiotensin II in H9C2 cells [92]
Astragaloside IV(AS-IV) CaSR/PLC/PKCα/PP1↓→SERCA2α Ligaturing LAD in rats [93]
Nrf2 ↑→TBK1/PI3K/AKT activity↓ Aortic banding in mice [94, 95]
TLR4/NF-кB↓ ISO in rat [96]
Anti-oxidation Shengmai San MDA↓ Ligaturing LAD in rat [97]
Danqi Pill HIF-1α/PGC-1α signaling pathway↑ Ligaturing LAD in rat, OGD/R-induced H9C2 cells [98]
Shengmai injection AKT and ERK1/2→SOD ↑ H2O2 in n primary cardiomyocyte [99]
Tanshinone IIA GPx↑→SOD ↑, MDA↓ H2O2 in macrophages [100]
Nrf2↑ H2O2 in H9C2 cells [101]
NADPH oxidase↑ Ligaturing LAD in rats [102]
Astragaloside IV(AS-IV) NOXs ↓→SOD ↑ ApoE−/− mice, ISO in primary rat [103, 104]
MDA, CPK, LDH ↓ H/R in cardiomyocyte [105]
NADPH oxidase-ROS-NF-κB ↓ H2O2 in HUVECs [106]
Ouabain PI3K/Akt↑→NO ↑ Ligaturing LAD in rats [107]
NADPH oxidase↑ Primary cardiomyocytes [108]
Anti- fibrosis Danshen formulae NOX2/ROS/p38→Collagen I↓ ISO in rat [109]
Shengmai San Collagen I, Collagen III↓ Myocardial infarction (MI) in rat [110]
Xuefuzhuyu Decoction TGF-β1↓ Spontaneously hypertensive rats [111]
Qishen Yiqi Dripping Pill (QSYQ) RAAS↓→MMP-2,MMP-9, Ligaturing LAD in rats [112]
Collagen I, Collagen III↓
Shengmai Collagen I, Collagen III↓, TGF-β1↓ Doxorubicin injection in rat [113]
Tanshinone IIA NADPH oxidase↑→collagen I, Ligaturing LAD in rats [102]
collagen III, TGF‑β1 ↓
NO↑, eNOS phosphorylation↑ Angiotensin II in rat cardiac fibroblasts [114]
NOX↓ LPS in mice [115]
Astragaloside IV(AS-IV) TRPM7 ↓→Collagen ↓ ISO in rats; Hypoxia or ISO in fibroblasts [116]
ROS‑mediated MAPK↓ ISO in rat [105]
ROS↓→cardiotrophin‑1↓→Collagen ↓ ISO in cardiac fibroblasts [117]
Anti-inflammtion Danqi pill PLA2, COX-2, NF-κB↓ Ligaturing LAD in rat [118]
HIF-1α/PGC-1α signaling pathway↑ Ligaturing LAD in rat [98]
TXB2↓, PGI2↑ Ligaturing LAD in rat [119]
Qishen Yiqi Dripping Pill (QSYQ) NF-κB↓, JAK1↓ and AKT↓ Ligaturing LAD in rats [112]
Danhong injection NF-κB↓→TNF-α, IL-1β, and IL-6↓ Ligaturing LAD in rat [120]
Tanshinone IIA TLR4-NF-κB↓ Ligaturing LAD in mice [121]
SIRT1↑→TNF-α and IL-6↓ TAC in rat [122]
Astragaloside IV(AS-IV) TLR4/NF-κB ↓ ISO in rats [96, 123]
NF-кB signaling ↓, PI3K/AKT↑→TNF-α LPS in mice [124]
Ouabain IL-6↓, TNF-alpha↓ LPS in mice [125]
Anti-cardiomyocyte death Fuzhengkangfu decoction Bcl-2↑, cleaved caspase-3↓ Doxorubicin in H9C2 [126]
Qili Qiangxin Capsule Fas↓, cleaved caspase-3↓ Ligaturing LAD in rat [127]
Shengmai injection ER stress↓ →caspase-12↓ Doxorubicin in rat [128]
Tanshinone IIA/ Bcl-X↓, cleaved caspase-3↓ Abdominal aortic coarctation in rat, Doxorubicin in cardiomyocyte [129, 130]
Nrf2↑→p38 and mTOR signaling↓ TAC in mice [131]
AMPA↑→Bax, cleaved caspase-3↓ LAD in rat, H2O2 in H9C2 [132]
Astragaloside IV(AS-IV) Calpain-1 and ROS ↓→Bcl-2/Bax↑, MMP ↑ ISO in rats or H9C2 cells [133]
PI3K/AKT↑ Doxorubicin in cardiomyocyte [134]
Senp1↓→Bcl-2/bax↑, cleaved caspase-3↓ LAD in mice [135]
AKT, protein kinase B; AMPK, AMP-activated protein kinase; ANP, atrial natriuretic peptide; BNP, B-type natriuretic peptide; CaSR, calcium-sensing receptor; COX-2, cyclooxygenase 2; ERK1/2, extracellular signal-regulated kinase 1/2; GPx, glutathione peroxidase; HIF-1α, hypoxia-inducible factor-1alpha; IGF-2R, insulin-like growth factor 2 receptor; ISO, isoproterenol; JAK1, Janus kinase-1; JNK, Jun N-terminal kinase; LAD, the coronary artery; MAPKs, mitogen-activated protein kinases; MDA, malondialdehyde; MMP, matrix metalloproteinase; mTOR, mammalian target of rapamycin; NF-кB, nuclear factor kappa B; NO, nitric oxide; NOX, NADPH oxidase; Nrf2, nuclear factor erythroid 2-related factor; PGC-1α, peroxisome proliferator-activated receptor-gamma coactivator-1alpha; PGI2, prostaglandin I2; PI3K, Phosphatidylinositol-4,5-bisphosphate 3-kinase; PKC-α, protein kinase C-α; PLA2, phospholipase A2; PLC, phospholipase C; PP-1, Protein phosphatase-1; ROS, reactive oxygen species; RAAS, renin-angiotensin-aldosterone system; SERCA2a, sarcoendoplasmic reticulum calcium ATPase; Senp1, small ubiquitin-like modifier (SUMO)-specific protease 1; SIRT1, silent information regulator 1; SOD, superoxide dismutase; TBK1, TANK-binding kinase 1; TGFβ-1, transforming growth factor β-1; TLR4, toll-like receptor 4; TNF-α, tumour necrosis factor; TRPM7, transient receptor potential melastatin 7; TXB2, thromboxane B2. Up arrows indicate increased activity or production. Down arrows indicate decreased activity or production.
6.1 Anticardiac hypertrophy effects

Although it was reported that Zhenwu Tang could reduce the weight and volume of the heart and improve cardiac function, the mechanism is not clear [85]. Another study showed that Zhenwu Tang delayed ventricular hypertrophy by suppressing the expression of BNP, p-extracellular signal-regulated kinase 1/2 (ERK1/2), p-p38 and p-JNK [86].

According to previous study, the mass of the left ventricle (LV) and the thickness of the LV end-systolic posterior wall (LVPWs) in isoproterenol (ISO)-induced rats were reduced after Danghong injection which was associated with a reduction in atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) [87]. On the other hand, Danghong injection significantly attenuated cardiac hypertrophy by suppressing cell area enlargement and downregulating ET-1-induced brain natriuretic peptide (BNP) and cardiac muscle troponin T (TNNT2) protein expression [136]. In addition, it was reported that Shengmai injection could improve the cell-survival rate and reduce myocardial cell hypertrophy via activation of the AMP-activated protein kinase (AMPK) signaling pathway [88].

The intracellular calcium level is an important hypertrophic messenger and there are many Ca2+ channels that regulate intracellular calcium levels. In rats with HF, digitoxin mitigated myocardial remodeling and contractile impairment via Na+/Ca2+ exchanger levels, and decreased SERCA [89].

Tanshinone IIA has the ability to open ATP-sensitive K+ channels which could result in decreased Ca2+ levels in the cytoplasm and ultimately lead to vasodilatation [90]. On the other hand, it has been shown that sodium tanshinone IIA sulfonate (STS), a derivative of Tanshinone IIA, can inhibit Ca2+entry through reducing store-operated Ca2+ channels (SOCCs) and the expression of transient receptor potential canonical proteins (TRPCs) [91]. Tan IIA can also alleviate Ang II-induced hypertrophy in myocytes; however, multiple signaling pathways are involved, such as the MAPK and insulin-like growth factor 2 receptor (IGF-2R) pathways [92].

AS-IV improved cardiac diastole in chronic HF by decreasing the expression of protein kinase C-α (PKC-α), reducing PP-1 activity and enhancing SERCA activity [93]. On the other hand, it was reported that As-IV significantly improved cardiac function and limited hypertrophy by suppressing TANK-binding kinase 1 (TBK1)/ phosphatidylinositol - 3-kinase (PI3K)/protein kinase B (AKT) activity [94] which was partially mediated by activating the nuclear factor erythroid 2-related factor (Nrf2)/HO-1 signaling pathway [95]. Finally, AS-IV suppressed hypertrophy-related parameters and Toll-like receptor 4 (TLR4)/nuclear factor kappa B (NF-κB) in a rat model of ISO-induced cardiac hypertrophy [96]. This result indicated that AS-IV could inhibit myocardial hypertrophy by suppressing inflammation.

6.2 Anti-oxidative properties

As discussed above, oxidative stress plays a key role in the development of HF. It was reported that YiQiFuMai powder injection (YQFM), a traditional Chinese medicine prescription redeveloped based on Sheng-Mai-San, could decrease the content of malondialdehyde (MDA) [97]. Moreover, Danqi Pill protects against HF induced myocardial infarction by improving myocardial glucose metabolism, mitochondrial oxidative phosphorylation and biogenesis, which is associated with regulation of the hypoxia-inducible factor-1alpha (HIF-1α)/peroxisome proliferator-activated receptor-gamma coactivator-1alpha (PGC-1α) signaling pathway [98]. Furthermore, Shengmai injection restored the activity of superoxide dismutase (SOD), and glutathione reductase (GSR) in cardiomyocytes with H2O2-induced oxidative stress by activating AKT and the ERK1/2 pathway [99].

According to Chen et al. [137], Tanshinone IIA reduces the level of MDA and elevates the level of SOD, which is consistent with our previous study [138]. Furthermore, Tanshinone IIA can prevent oxidative stress injury by increasing glutathione peroxidase (GPx) activity and mRNA levels [100]. Although there is no direct evidence for the underlying mechanism, some studies have reported that Tan IIA can induce the expression of nuclear factor (erythroid-derived 2)-like 2 (Nrf2), a redox-sensitive transcription factor, to attenuate oxidative stress injury via increased transcription of certain antioxidant genes, including SOD [101]. Finally, a recent study showed that Tanshinone IIA reversed the decreases in superoxide dismutase activity and malondialdehyde and the increases of superoxide anions and NADPH oxidase activity in both HF rats and Ang IItreated cardiac fibroblasts [102].

It was reported that AS-IV treatment could attenuate oxidative stress via increasing the activity of SOD and reducing nicotinamide adenine dinucleotide phosphate oxidase (NOX) levels [103]. On the other hand, AS-IV could markedly enhanced cell viability and reduced MDA content and lactate dehydrogenase (LDH) activity in cardiomyocytes a hypoxia/reoxygenation (H/R) model [104]. AS-IV could also block ROS production in ISO-treated primary rat cardiac fibroblasts which might be associated with inhibiting nicotinamide adenine dinucleotide phosphate (NADPH) oxidase-NF-κB signaling [105, 106].

Ouabain is an endogenous cardiac glycoside produced in the central nervous system that can also be extracted from the seeds of Strophanthus gratus [139]. It was reported that ouabain could decrease the vascular reactivity of aortic rings and increase nitric oxide production via a PI3K/Akt-dependent pathway in HF rats [107]. On the other hand, ouabain could also stimulate mitochondrial NADH production to attenuate the oxidative metabolic state [108].

6.3 Anti-fibrotic effects

Several TCM formulae have been shown to have anti-fibrotic effects. Isopropyl 3-(3,4-dihydroxyphenyl)-2-hydroxylpropanoate (IDHP), a metabolite of Danshen formulae, attenuates cardiac fibrosis and decreases collagen I synthesis via a NOX2/ROS/p38 pathway [109]. Additionally, a recent study showed that a Shengmai San-derived herbal improved the conduction velocity and homogeneity and decreased left atrial positive fibrosis areas and the expression of type I and III collagen in myocardial infarction (MI)-induced HF rats [110]. Finally, a study showed that Xuefuzhuyu decoction treatment decreased cardiac fibrosis induced by hypertension and inhibited the expression of TGF-β1 [111]

QSYQ exerted an anti-fibrotic effect in AMI rat models by reducing matrix metalloproteinase-2 (MMP-2), MMP-9, collagen I and collagen III by inhibiting the renin-angiotensin-aldosterone system (RAAS) [112]. Other studies confirmed that QSYQ had definite effect on myocardial fibrosis via the TGFβ1 signaling pathway [140]. Furthermore, Shengmai has protective effect on reducing cardiac toxicity in rats treated with doxorubicin (DOX). Myocardial fibrosis markers, including procollagen type III and TGF-β1, were suppressed after Shengmai treatment [113].

According to a previous study, Tan IIA administration markedly reversed the increases of expression levels of collagen I, III, TGFβ1, αSMA, MMP-2 and MMP-9 in a rat model of HF [102]. Although the underlying mechanism is not clear, it is associated with the activation of Smad2/3, NF-κB and Nrf2 expression, which not only has an antioxidant effect but also attenuates fibrosis [141]. Furthermore, Tan IIA inhibits Ang II-induced cell proliferation in rat cardiac fibroblasts by increasing NO generation and eNOS phosphorylation [114]. Finally, Tan IIA attenuates the development of myocardial fibrosis and fibrosis-related genes and mediators by decreasing the expression of NADPH oxidase subunit (NOX) and ROS levels [115]. However, the anti-fibrotic effect mainly involves other organs, such as the lungs and kidney; therefore, the anti-fibrotic effects of Tan IIA on cardiac tissue need to be further investigated.

According to a previous study, AS-IV inhibited transient receptor potential melastatin 7 (TRPM7) protein expression and blocked hypoxia-induced fibrosis to attenuate fibrosis of the heart tissue [116]. On the other hand, AS-IV significantly inhibited ISO-induced fibrosis by blocking MAPK activation in rat cardiac fibroblasts [105]. Finally, cardiac fibroblast proliferation and type I collagen synthesis were effectively abrogated by cardiotrophin-1 (CT-1) small interfering RNA. This result suggested that AS-IV could also prevent cardiac fibrosis by inhibiting CT-1 upregulation [117].

6.4 Anti-inflammatory effects

According to a previous study, the Danqi pill downregulated the expression of phospholipase A2 (PLA2), cyclooxygenase 2 (COX-2) and NF-κB in the inflammatory pathway in a model of coronary heart disease [118]; however, the underlying mechanism remains elusive. A recent study showed that the Danqi pill could improve cardiac functions and attenuate inflammatory infiltration by regulating HIF-1α/PGC-1α signaling pathway in HF post-AMI rats [98]. Furthermore, the Danqi pill downregulated the expression of thromboxane B2 (TXB2) and upregulated the expression of prostaglandin I2 (PGI2) to suppress inflammation [119].

Furthermore, QSYQ attenuated myocardial fibrosis by reducing the expression of the angiotensin type 1 receptor (AT1), increasing the expression of AT2 in the RAAS pathway and suppressing the levels of NF-κB, JAK1 and AKT [112]. Finally, Danhong injection also suppressed the expression of inflammatory factors and inhibited NF-κB p65 nuclear translocation and phosphorylation of IκBα to exert anti-inflammatory effects, which were associated with the regulation of miRNA expression [120]. In a clinical trial, inflammatory factor-soluble CD40 ligand was also reduced by Danhong injection in acute coronary syndrome (ACS) patients [142].

Tanshinone IIA has been used in TCM for the treatment of a variety of inflammatory and cardiovascular disorders. According to a previous study, Tan-IIA can attenuate LADinduced myocardial ischemia injury by inhibiting the expression of certain proinflammatory cytokines (IL-1β and TNF-α) associated with inhibiting Toll-like receptor (TLR) 4-NF-κB signaling [121]. Furthermore, Tan IIA significantly alleviates transverse aortic constriction-induced myocardial remodeling by activating the silent information regulator 1 (SIRT1) signaling pathway and then reduces myocardium malondialdehyde (MDA) content and cardiac inflammatory cytokines (TNF-α and IL-6) [122]. In addition to suppressing the expression of proinflammatory cytokines, Tanshinone IIA can also elevate the levels of anti-inflammatory cytokines, such as IL-10, to suppress T cell activation [143].

AS-IV has a strong effect against inflammation. AS-IV treatment inhibited the highly activated inflammatory response by suppressing the TLR4/NF-κB pathway in HF rats [96, 123]. In LPS-induced HF mice, AS-IV significantly decreased serum inflammatory mediators, including TNF-αand monocyte chemoattractant protein-1 (MCP-1), by suppressing NF-κB signaling and activating the PI3K/AKT pathway [124].

Ouabain was found to protect against LPS-induced inflammation in mice and decrease the expression levels of IL-6 and TNF-alpha in vivo [125]; however, a recent study demonstrated that ouabain could induce NLRP3 inflammasome activation as well as subsequent IL-1β release from macrophages and then promote cardiac inflammation [144]. Thus, the underlying adverse effects of cardiac glycosides needed to be further investigated.

6.5 Anti-cardiomyocyte death effects

According to our study, Fuzhengkangfu decoction ameliorated DOX-induced H9C2 cell apoptosis and increased the Bcl-2/Bax ratio which might be associated with inhibiting the loss of mitochondrial membrane potential [126]. Qili qiangxin capsule inhibited cardiomyocyte apoptosis in ischemic heart tissues by suppressing the expression of Fas and caspase-3 [127]. QishenYiqi Dripping Pill also efficiently improved cardiac function by inhibiting cardiac apoptosis via the β2-adrenergic receptor signaling pathway [145]. Shengmai injection inhibited endoplasmic reticulum stress-induced apoptosis and rescued heart dysfunction induced by DOX [128]. On the other hand, one study showed that Shengmai injection reduced apoptotic cardiomyocytes induced by H2O2 by upregulating intracellular AKT phosphorylation and downregulating ERK1/2 phosphorylation [99].

Several studies have reported that Tan IIA plays a critical role in attenuating cardiomyocyte apoptosis in models of HF [129, 130]. Specifically, Tan IIA can protect cardiomyocytes from doxorubicin-induced apoptosis by reducing the levels of cleaved caspase-3 and cytosolic cytochrome c, which are associated with the activation of AKT signaling pathways and suppression of ROS generation [130]. Indeed, our previous study showed that Tan IIA can increase the activity of SOD [146]. Although the underlying mechanism is not clear, it might be associated with an increase in Nrf2 gene transcription. It has been demonstrated that Tan IIA can increase Nrf2 expression to reduce myocardial apoptosis and that this effect is significantly dampened in cardiac-specific Nrf2 knockout mice [131]. Tan IIA can also upregulate AMPK expression and downregulate mammalian target of rapamycin (mTOR) expression to inhibit apoptosis [132]. Finally, Tan IIA can reduce apoptosis via inhibition of endoplasmic reticulum stress [146].

It was found that the apoptosis rate was reduced by AS-IV treatment which was associated with increasing Bcl-2 levels, decreasing the expression of calpain-1 and improving the integrity of the mitochondrial structure and the mitochondrial membrane potential (MMP) in ISO-induced hypertrophic cardiomyocytes; moreover, AS-IV also increased the expression of mitochondrial superoxide dismutase (mito-SOD) [133]. Furthermore, AS-IV significantly inhibited apoptosis via the PI3K/Akt signaling pathway in DOX-induced cardiotoxicity [134]. Finally, AS-IV improved the cardiac function of HF mice by decreasing the levels of ROS and H2O2 in the myocardium, suppressing the decrease in mitochondrial membrane potential and decreasing myocardial cell apoptosis by decreasing the expression of Bcl-2 and increasing the expression of cleaved caspase-3 and Bax. These functions were mediated by inhibiting the increased expression of small ubiquitin-like modifier (SUMO)-specific protease 1 (Senp1) [135].

7. Conclusions and perspectives

As discussed above, HF is associated with multiple risk factors. Therefore, multitargeted treatments may be more effective in treating HF than therapy against a single target. However, chemical drugs do not have ideal therapeutic effects according to recent clinical studies. The combined application of herbal and chemical drugs for the treatment of HF is emerging as a trend in modern medicine. Natural products from Chinese herbs have been shown to have anticardiac hypertrophy, antifibrotic, anti-inflammatory, antioxidative and antiapoptotic properties. However, there are several limitations to these findings. First, most of the evidence did not come from clinical studies, and there is a lack of large scale, multicenter, randomized and controlled clinical trials for the use of these drugs to treat HF. Second, it has been shown that at high concentrations, some natural products have toxic effects on embryonic development [147]. The systemic and organ-specific toxic effects and the minimally toxic dose of these natural products remain to be investigated. Finally, HF is caused by multiple factors. A large part of the published literature has focused on examining the effects of natural products on one or a few aspects of HF. Despite these limitations, further clinical trials and experimental studies will provide a better understanding of the mechanism of natural products from Chinese herbs to promote the development of these natural products from Chinese herbs for the treatment and prevention of HF.

Author contributions

LHX, LYC and GYG wrote the manuscript with support from YW, YZX and YGZ; LHX LYC and GYG revised the manuscript under the guidance of YW, YZX and YGZ. All authors read and approved the final manuscript.

Ethics approval and consent to participate

Not applicable.


We would like to thank the key medical discipline (Cardiovascular medicine) of Hangzhou for supporting references material during the preparation of this manuscript.


This research was funded by the Science and Technology Program of Traditional Chinese Medicine in Zhejiang Province (2022ZZ028).

Conflict of interest

The authors declare no conflict of interest.

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