PMID: 9186904May 1, 1997Paper

Linoleic acid enhances the secretion of plasminogen activator inhibitor type 1 by HepG2 cells.

Journal of Lipid Research
C BanfiE Tremoli

Abstract

This study was undertaken in order to assess whether triglycerides and/or their fatty acids directly influence the secretion of plasminogen activator inhibitor type 1 (PAI-1) in HepG2 cells. To this end, subconfluent HepG2 cells were incubated with triglyceride-rich particles (TGRP) isolated from Intralipid for 16 h, and PAI-1 levels were determined in conditioned medium using a specific ELISA. TGRP (1 to 6 mg triglycerides/ml) concentration-dependently increased PAI-1 secretion by cells, concomitantly with significant increases in intracellular triglyceride (TG) levels. Fatty acid analysis indicated that the incubation of cells with 3 mg of TG per ml of TGRP induced significant accumulation of 18:2 n-6 (linoleic acid, LA) and 18:3 n-3 (linolenic acid) reflecting the fatty acid composition at the added triglycerides. We then tested the comparative effects on PAI-1 secretion by HepG2 cells of LA and 18:1 n-9 (oleic acid, OA). LA, as a bovine serum albumin (BSA) complex, concentration-dependently (1 to 35 mumol/L) increased the secretion of PAI-1 by cells, whereas OA-BSA only minimally affected it at the highest concentration used (35 mumol/L). Incorporation of LA into cell pools, in the presence of increasing concentration of th...Continue Reading

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