IMR Press / FBL / Volume 13 / Issue 3 / DOI: 10.2741/2748

Frontiers in Bioscience-Landmark (FBL) is published by IMR Press from Volume 26 Issue 5 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on as a courtesy and upon agreement with Frontiers in Bioscience.

The biological role of the unique molecule RCAS1: a bioactive marker that induces connective tissue remodeling and lymphocyte apoptosis
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1 Department of Obstetrics and Gynecology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
2 Department of Biochemistry, Faculty of Medicine, Fukuoka University, Fukuoka 814-0180, Japan
3 Department of Clinical Pharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka 814-0180, Japan
Front. Biosci. (Landmark Ed) 2008, 13(3), 1106–1116;
Published: 1 January 2008

RCAS1 is a receptor-binding cancer antigen which is expressed on human uterine cervical adenocarcinoma cell line (SiSo). Finding a correlation between the expression of this gene and the overall survival of patients with 14 different types of cancer points to the clinical significance of this gene. Moreover, the expression RCAS1 correlates with other clinicopathological parameters including the histological type of cancer, its differentiation, tumor size, clinical stage, the depth of invasion, lymphovascular space involvement, lymph node metastasis, and positive peritoneal cytological results. RCAS1 can induce apoptosis in peripheral lymphocytes in vitro as well as in an increased number of apoptotic tumor-infiltrating lymphocytes. RCAS1 is also believed to contribute to the escape of tumor cells from immune surveillance. RCAS1 is secreted via ectodomain shedding, and its expression is related to changes in the characteristics of the extracellular matrix and to a reduced number of vimentin-positive tumor stromal cells, findings that suggest that RCAS1 may induce connective tissue remodeling. The concentration of RCAS1 in serum or pleural effusions has been found to be significantly higher in patients with several different types of cancer as compared to normal controls. Together, the available data shows that RCAS1 may have value as a biomarker for monitoring therapeutic efficacy. Further exploration of the biological function of RCAS1 should help in the development of new therapeutic strategies against human malignancies.

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