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. 1994 Aug;35(8):1102–1106. doi: 10.1136/gut.35.8.1102

Enhancement of ethanol induced rectal mucosal hyper regeneration with age in F344 rats.

U A Simanowski 1, P Suter 1, R M Russell 1, M Heller 1, R Waldherr 1, R Ward 1, T J Peters 1, D Smith 1, H K Seitz 1
PMCID: PMC1375063  PMID: 7926914

Abstract

Experimental studies in rats have shown an independent stimulation of rectal cell turnover by either chronic ethanol consumption or age. In this study the combined effect of these two factors on colorectal cell regeneration has been investigated. Ninety male F344 rats aged 2, 12, and 22 months were pair fed nutritionally adequate liquid diets containing 36% of total energy either as ethanol or isoenergetic carbohydrates. After four weeks of feeding, colorectal crypt cell production rates were measured using a stathmokinetic technique with vincristine. While age by itself did not affect colorectal cell renewal, chronic ethanol consumption stimulated rectal, but not colonic crypt cell production rate in an age dependent manner. While no significant effect of ethanol was noted in young animals, cell proliferation was significantly enhanced in middle aged animals by 81% (4.1 (2.7-5.5) v 7.4 (6.0-8.7) cells/crypt/hour, p < 0.001) and in old animals by 138% (4.5 (3.3-5.6) v 10.7 (8.9-12.4) cells/crypt/hour, p < 0.001) after ethanol ingestion. Because acetaldehyde, the first and most toxic metabolite of ethanol, has been detected in the colorectal mucosa and may lead to tissue injury influencing cell regeneration, acetaldehyde concentrations have been measured in the colons of 15 male F344 rats of various ages after an acute intraperitoneal dose of ethanol (2.5 g/kg bodyweight). There was a significant positive correlation between crypt cell production rate and acetaldehyde concentrations measured in the distal and proximal colon after an acute dose of ethanol (r = 0.5955, p < 0.005). These data clearly show that the ethanol mediated stimulation of cell regeneration in the rectum is age dependent. As reported earlier, there was found indirect evidence that acetaldehyde participates in the pathogenesis of rectal hyperregeneration after chronic alcohol consumption. This hyperregeneration of the rectal mucosa after alcohol drinking could by itself favour carcinogenesis, which is especially relevant in old age.

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Selected References

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