Statins Inhibit the Growth of Variant Human Embryonic Stem Cells and Cancer Cells in Vitro but Not Normal Human Embryonic Stem Cells

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 2009 May 15

PMID 19438511

Citations 20

Authors

K Gauthaman

N Manasi

A Bongso

Affiliations

Soon will be listed here.

Abstract

Background And Purpose: Statins inhibit proliferation of various human cancer cell lines in vitro. As human embryonic stem cells (hESCs) possess neoplastic-like properties we have evaluated the role of various statins on karyotypically normal hESCs (HES3 and BG01), abnormal hESCs (BG01V) and breast adenocarcinoma cells (MCF-7) to evaluate whether the mode of action of the statins was via a stemness pathway.

Experimental Approach: All cell lines were treated with simvastatin, pravastatin, lovastatin and mevastatin (1 micromol x L(-1) to 20 micromol x L(-1)) up to 7 days and their effects on cell proliferation, cell cycle, apoptosis and pluripotency studied.

Key Results: All four statins did not inhibit HES3 and BG01 proliferation, but BG01V and MCF-7 were inhibited by simvastatin, lovastatin and mevastatin. These inhibitory effects were reversed by the endogenous isoprenoids, farnesylpyrophosphate and geranylgeranylpyrophosphate. Terminal deoxynucleotidyl transferase biotin-dUTP nick end labelling and cell cycle assay confirmed apoptosis in BG01V and MCF-7. Stem cell surface markers [stage-specific embryonic antigen-4, tumour rejection antigen-1-81, octamer-4 (OCT-4)] were expressed in HES3 and BG01, but not in BG01V cells, even after prolonged treatment with simvastatin. In BG01V and MCF-7, the pro-apoptotic Bcl-2-associated X protein genes were up-regulated, while the antiapoptotic BCL2 and SURVIVIN genes were down-regulated. Expression of the stemness-related genes namely, the growth differentiation factor-3, NANOG and OCT-4 was decreased in BG01V compared with BG01 and HES3.

Conclusions And Implications: Normal hESCs were resistant to prolonged exposure to statins over a range of doses, compared with BG01V and MCF-7, probably because of genetic and behavioural differences. The statins not only have anti-cancer properties but can suppress abnormal hESCs thus promoting growth of normal hESCs in vitro.

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