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Indexed/Abstracted in: BIOSIS Previews, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,6
Online ISSN 1827-1898
Shu X. L. 1, Xu H. 1, Yu T. T. 1, Zhong J. X. 2, Lei T. 2
1 Department of Nutrition, East Hospital, Tong Ji University School of Medicine, Shanghai, Republic of China;
2 Department of Pediatrics, Tongji Hospital, Tongji University School of Medicine, Shanghai, Republic of China
AIM: L-arginine (L-Arg) is an aminoacid that has immunomodulating and antitumor effects. It is possible that antitumor effects of L-Arg are due to induction of apoptosis in tumor cells. The present study assessed antiproliferating and proapoptotic effects of L-Arg in human gastric cancer cell line SGC-7901.
METHODS: Cell proliferation was quantified by MTT assay. Apoptosis was assessed using flow cytometry and FITC-Annexin-V/propidium iodide staining. Expression and activation of proteins pertinent to apoptosis (Bcl-2, surviving, p53, and XIAP) were studied using PCR, Western blot, and activity assays.
RESULTS: L-Arg significantly inhibited growth of SCG-7901 gastric cancer cells and downregulated expression of antiapoptotic gene Bcl-2 and survivin. By contrast, expression of p53 was upregulated by L-Arg.
CONCLUSION: Regulation of apoptosis by L-Arg via downregulation of antiapoptotic proteins Bcl-2 and surviving, and upregulation of proapoptotic protein p53 may represent the mechanism behind antitumor effects of L-Arg.