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      Age-Related Changes in Plasma Corticosterone and Aldosterone Responses to Exogenous ACTH in the Rat

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          Abstract

          Age related changes in the time courses of response of plasma corticosterone and aldosterone to exogenously applied ACTH were simultaneously studied in old (female and male) Long-Evans rats and compared to both young and adult pentobarbitone-anesthetized and dexamethasone-pretreated control rats. Acute intravenous injection of either 0.5 or 50.0 ng ACTH (1-24)/100 g body weight increased plasma concentrations of the two steroids with a similar time course in all groups of rats. However, we observed a significant age-related attenuation in the plasma corticosteroid response. Thus, in old as compared to young rats there was a decrease of approximately 45, 40 and 30% in plasma corticosterone levels respectively 8 min after the lower dose of ACTH in female and 45 min after the higher dose in female and male rats. Similarly, an attenuated (approximately -38%) response of plasma aldosterone levels, induced 45 min after the higher dose of ACTH, was observed both in old female and male rats. These results suggest that the previously reported age-related decreases of in vivo corticosterone and aldosterone secretion are, at least in part, due to a reduced capacity of adrenocortical cells for steroid biosynthesis and release in response to stimulation by ACTH.

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          Author and article information

          Journal
          HRE
          Horm Res Paediatr
          10.1159/issn.1663-2818
          Hormone Research in Paediatrics
          S. Karger AG
          1663-2818
          1663-2826
          1995
          1995
          05 December 2008
          : 43
          : 5
          : 181-187
          Affiliations
          Laboratoire d’Endocrinologie comparée, Université Bordeaux I, UFR de Biologie, Talence, France
          Article
          184275 Horm Res 1995;43:181–187
          10.1159/000184275
          7782047
          © 1995 S. Karger AG, Basel

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          Page count
          Pages: 7
          Categories
          Original Paper

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