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      Circadian Adrenocortical Rhythm in the Adrenalectomized Rat With or Without Autotransplanted Adrenal Gland

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          Abstract

          Circadian rhythm of blood corticosterone in adrenalectomized rats with (AT rat) or without adrenal auto-transplants was investigated. Blood samples were obtained individually at 4-hour intervals for a 24-hour period per week for 5–7 consecutive weeks by the tail tip incision method. Corticosterone responses of the autotransplanted adrenal gland to ACTH gradually increased with time after the implantation, and by 5 weeks had attained a level comparable to that of intact rats. Concurrently with this change, circadian adrenocortical rhythms in AT rats became evident and they were able to respond to a reversed photoperiodic environment. The effects of constant illumination or food restriction on the corticosterone rhythm in AT rats were indistinguishable from those in intact rats in every respect. A sharp drop and disappearance of circadian periodicity were observed in the blood corticosterone levels by removal of autotransplanted adrenals. In some of the adrenalectomized rats, the daily rhythm of the blood corticosterone levels reappeared 5–7 weeks after surgery owing to the hypertrophy of accessory adrenal glands or regeneration from capsular fragment left in situ. These results suggest that neural input to the adrenal is not essential for the occurrence of circadian adrenocortical rhythms.

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          Author and article information

          Journal
          NEN
          Neuroendocrinology
          10.1159/issn.0028-3835
          Neuroendocrinology
          S. Karger AG
          0028-3835
          1423-0194
          1982
          1982
          26 March 2008
          : 34
          : 3
          : 157-162
          Affiliations
          Department of Medical Chemistry, Tokyo Metropolitan Institute for Neurosciences, Fuchu-city, Tokyo, Japan
          Article
          123294 Neuroendocrinology 1982;34:157–162
          10.1159/000123294
          7070590
          © 1982 S. Karger AG, Basel

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          Page count
          Pages: 6
          Categories
          Original Paper

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