IMR Press / FBE / Volume 3 / Issue 4 / DOI: 10.2741/E355

Frontiers in Bioscience-Elite (FBE) is published by IMR Press from Volume 13 Issue 2 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on imrpress.com as a courtesy and upon agreement with Frontiers in Bioscience.

Open Access Article
EPO reduces reactive gliosis and stimulates neurotrophin expression in Muller cells
Show Less
1 Department of Ophthalmology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
2 Tongji Eye Institute and Department of Regenerative Medicine, Tongji University School of Medicine, Shanghai, China
3 Laboratory of Clinical Visual Sciences, Institute of Health Sciences, Shanghai Institutes for Biological Sciences and Shanghai Jiaotong University School of Medicine, Chinese Academy of Sciences, Shanghai, China
4 Beyoglu Eye Research and Training Hospital, Istanbul, Turkey
5 Department of Ophthalmology, Drexel University College of Medicine, Philadelphia, PA, USA

*Author to whom correspondence should be addressed.

Academic Editor: Qingli Li

Front. Biosci. (Elite Ed) 2011, 3(4), 1541–1555; https://doi.org/10.2741/E355
Published: 1 June 2011
(This article belongs to the Special Issue Hyperspectral imaging in biomedicine)
Abstract

To characterize Müller cell-mediated neuroprotective and neurotrophic functions of the erythropoietin (EPO)/EPO receptor (EpoR) system in diabetic rat retina. A single intravitreal injection of EPO (8 mU/eye) was administered in rats 4 or 24 weeks after diabetes onset. The results showed that intravitreal EPO ameliorated the up-regulation of GFAP and vimentin in the diabetic retina evaluated by immunofluorescence and Western blotting; but up-regulated BDNF and CNTF expressions, quantified by real-time PCR and ELISA, in the 24-week diabetic rat retinas. In vitro, BDNF and CNTF expressions were stimulated by EPO through both extracellular signal-regulated kinase1/2 (ERK1/2) and Akt pathways. The neuro-regenerative function of EPO, as indicated by promotion of neurite outgrowth, was corroborated in vitro. BDNF was involved in EPO-induced neurite outgrowth of primary rat retinal neurons. Exogenous EPO exerts neuroprotective and neurotrophic functions by attenuating reactive gliosis and promoting neurotrophic factors in Muller cells in diabetic retina. Signaling pathways that are responsible for these Muller cell-mediated EPO/EpoR functions may be therapeutic targets for diabetic retinopathy.

Keywords
Diabetic Retinopathy
Erythropoietin
Müller cells
Neurotrophin
Gliosis
MAPK/ERK
PI3K
Share
Back to top