NO Chi Generation by Cultured Small Intestinal Epithelial Cells

Overview

Journal Dig Dis Sci

Specialty Gastroenterology

Date 1995 Sep 1

PMID 7555434

Citations 8

Authors

A U Dignass

D K Podolsky

D Rachmilewitz

Affiliations

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Abstract

The effect of cytokines, growth factors, mitogens, and bacterial products on nitric oxide (NO) generation by monolayers of small intestinal epithelial cells-6 (IEC-6) cells was evaluated. Subconfluent IEC-6 cells were maintained in DMEM containing 5% fetal calf serum and after 16-24 hr of incubation, the medium was replaced with fresh medium in the presence or absence of calcium ionophore (CaI), L-NAME, L-NNA, individual growth factors, cytokines, or mitogens. After 72 hr of culture, the media supernatant was collected and NO chi generation was determined. NO synthase activity was determined in sonicated supernatants of IEC-6 cells by [14C] arginine conversion to citrulline. NO chi generation in subconfluent cultures was greater than in fully confluent cultures, suggesting contact inhibition. NO chi generation by IEC-6 cells was significantly increased by CaI and inhibited by L-NAME and L-NNA. LPS, IL-1 beta, IL-2, IL-8, IFN-8, TFN-alpha, EGF, TGF-alpha, bFGF, and PHA significantly increased NO chi generation. NO synthase activity in IEC-6 cells (4.2 +/- 1.7 pmol/min/10(6) cells) was NADPH dependent. These results suggest that stimulation of NO chi generation by intestinal epithelial cells through cytokine bacterial products and mitogens may be one of the mechanisms responsible for their effects in the intestinal tract.

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