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Acetaldehyde activates the promoter of the mouse α2(I) collagen gene

✍ Scribed by Albert Parés,*; James J. Potter; Lynda Rennie; Esteban Mezey

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
644 KB
Volume
19
Category
Article
ISSN
0270-9139

No coin nor oath required. For personal study only.

✦ Synopsis

The mechanism whereby ethanol ingestion results in hepatic fibrosis remains unknown. Acetaldehyde has been shown to increase a,(I) collagen gene transcription in human fibroblasts and in rat myofibroblastlike cells (Ito cells) in culture. In this study, the effect of acetaldehyde was determined on the activation of the %(I) collagen promoter. A plasmid containing the mouse a#) collagen promoter region (-2000 to 54), fused to the coding sequence of the reporter gene chloramphenicol acetyl transferase and similar plasmid constructs containing deletions in the collagen promoter, were transfected into NIH 3T3 fibroblasts in culture. Acetaldehyde (200 pmol/L) and transforming growth factor-61 (5 ng/ml) activated the wild type promoter. The combination of acetaldehyde and transforming growth factor-fil did not result in a greater effect than either alone. Acetaldehyde inhibited, whereas transforming growth factor-61 did not activate, the promoter, with a -352 to -104 deletion. By contrast, acetaldehyde had no effect, whereas transforming growth factor-61 resulted in a small decrease in the activity of the promoter, with a -501 to -352 deletion. This study shows that acetaldehyde and transforming growth factor-f3l independently activate the mouse %(I) collagen promoter and that this activation is mediated by the same proximal region of the promoter. (HEPATOLOGY 1994; 19:498-503.) Alcoholism is a principal cause of cirrhosis. The mechanism whereby ethanol ingestion results in hepatic fibrosis is unknown. Hepatic lipocytes, which are localized in the space of Disse, are the principal source of collagen accumulation after liver injury. After long-term ethanol feeding (1) or CCl, injury (2) the hepatic lipocytes proliferate and are activated to myofibroblastslike cells in association with an increase in depo-

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