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Int J Mol Sci. 2011;12(12):9342-53. doi: 10.3390/ijms12129342. Epub 2011 Dec 13.

The relationships between biological activities and structure of flavan-3-ols.

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  • 1Department of Functional Genomics and Experimental Pathology, Cancer Institute "Ion Chiricuta", 34-35 Republicii, Cluj-Napoca 400015, Romania. cornelia.braicu@iocn.ro

Abstract

Flavan-3-ols are involved in multiple metabolic pathways that induce inhibition of cell proliferation. We studied the structure-activity relationship of gallic acid (GA) and four flavan-3-ols: epigallocatechin gallate (EGCG), epigallocatechin (EGC), catechin (C), and epicatechin (EC). We measured the cell viability by the MTT assay and we determined the concentration of testing compound required to reduce cell viability by 50% (IC(50)). All tested compounds showed a dose-dependent and time-dependent inhibitory antiproliferative effect on Hs578T cells; IC(50) values varying from the 15.81 to 326.8 μM. Intracellular ROS (reactive oxygen species) were quantified using a fluorescent probe 2',7'-dichlorofluorescin diacetate (DCFH-DA). Only the treatment with 10 μM EGC and EGCG was able to induce a significant decrease of ROS concentration and increased levels of ROS were registered for 100 μM EGCG, EGC and GA. Flavans-3-ols and GA induced apoptosis in a dose- and time-dependent manner, which indicated that the induction of apoptosis mediated their cytotoxic activity at least partially. The galloylated catechins have shown a stronger antiproliferative activity and apoptotic effect than the one produced by non galloylated catechins. The galloylated flavan-3-ols are potential therapeutic agents for patients with triple negative breast cancer via induction of apoptosis.

KEYWORDS:

apoptosis; catechins; cell proliferation; gallate moiety; pro/antioxidant; structure-activity relationship

PMID:
22272136
[PubMed - in process]
PMCID:
PMC3257133
Free PMC Article

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