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Altered polyamine biosynthesis with aging after massive proximal small bowel resection in rat

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Abstract

We examined the effect of aging on polyamine biosynthesis in the small intestine. Two groups of male Wistar rats (young; 10-week-old,n=40; old; 24-month-old,n=40) underwent either a jejunal transection and reanastomosis or 90% proximal small bowel resection. The rats were sacrificed on the 1st, 2nd, 4th, and 7th postoperative day (POD). The mucosa was submitted for histological examination, weighed, and assayed for protein, DNA, RNA, and polyamine content. Ornithine decarboxylase (ODC) activity was measured and ODC mRNA in the mucosa was determined by Northern blot analysis. Compared with the values for wet weight and protein content in old rats, young rats showed significantly higher values for wet weight on the 1st and 2nd POD, and for protein content on the 1st POD, but there were no differences between young and old rats after the 4th POD. The values for ODC activity and ODC mRNA were significantly lower in old rats than in young rats on the 1st POD, but there were no differences between young and old rats after the 2nd POD. The value for putrescine in old rats was significantly lower on the 2nd POD, but was significantly higher on the 4th POD than that in young rats. The present study showed that, in old rats, the residual intestine after small bowel resection preserved sufficient adaptive capacity, but that the adaptive response was decreased. The findings in this study also suggest that a decrease in ODC mRNA expression is involved in the decreased adaptive response that occurs with aging.

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Authors and Affiliations

  1. Second Department of Internal Medicine, Shiga University of Medical Science, Tsukinowa, Seta, Otsu, 520-21, Shiga, Japan

    Kenichiro Sakamoto, Yoshihide Fujiyama & Tadao Bamba

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  1. Kenichiro Sakamoto
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  2. Yoshihide Fujiyama
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  3. Tadao Bamba
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Sakamoto, K., Fujiyama, Y. & Bamba, T. Altered polyamine biosynthesis with aging after massive proximal small bowel resection in rat. J Gastroenterol 31, 338–346 (1996). https://doi.org/10.1007/BF02355022

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  • DOI: https://doi.org/10.1007/BF02355022

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