EGCG mediated downregulation of NF-AT and macrophage infiltration in experimental hepatic steatosis

Abstract

Scope: Increased fat consumption in industrialized countries has resulted in hepatic steatosis that upregulates atherogenic aspirant genes, leading to atherosclerosis and mortality. Although extensive studies have been carried out to elucidate the atheroprotective efficacy of epigallocatechin-3-gallate (EGCG), the effect of EGCG on hepatic steatosis has not been studied comprehensively. Hence, the current study was designed to find out the effect of EGCG on hepatic events that prelude atherosclerosis with special reference to macrophage infiltration.

Methods and results: Male albino rats of Wistar strain were used in this study. Basic biochemical assays along with the protein expression of CAMs, NF-κB, TNF-α and NF-AT were assayed in the current study. EGCG supplementation significantly reverted the alterations in both biochemical and histological parameters and is shown to reduce the TNF-α mediated NF-AT expression and thereby its downstream targets like ICAM-1 and E-selectin expression to a greater extent than NF-κB mediated downstream targets like VCAM-1 and P-selectin in hypercholesterolemic rat liver.

Conclusion: Our results suggest that EGCG influences the early events of atherosclerosis that occur; thereby modulating the NF-AT pathway and thereby mitigating the hypercholesterolemic stress.

Keywords: Epigallocatechin-3-gallate; Green tea; Hepatic damage; High cholesterol diet; Hypercholesterolemia; Macrophage infiltration.