Mode of Existence of Corticosterone in Adrenal Cells with Reference to Storage and Secretion

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概要

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• Rat adrenal contains dialyzable and non-dialyzable corticosterone. Total dialyzable corticosterone increased remarkably 20 and 30 min after a single subcutaneous injection of ACTH (1U./rat), while non-dialyzable corticosterone decreased 20min after ACTH followed by an increase 30min later. The increase of dialyzable and the decrease of non-dialyzable corticosterone were most pronounced in the cytosol fraction. Similar change in the contents of both types of corticosterone was also seen in the nuclear fraction after ACTH. In mitochondrial and microsomal fraction, definite increase of both types of corticosterone followed ACTH administration.<BR>No [<SUP>3</SUP>H] corticosterone binding <I>in vitro</I> to adrenal cytosol was detected, while it became detectable after the cytosol was dialyzed. Degree in the binding increased as the dialysis continued. Similar finding was obtained with the solubilized component of subcellular particle fractions by sonication. On the other hand, nuclear fraction, after exclusion of soluble component by sonication, associated with [<SUP>3</SUP>H]-corticosterone definitely although the fraction was not dialyzed. When adrenal homogenate was incubated with [3H] corticosterone in Visking dialysis tubing at 37°C, corticosterone in dialyzates maintained constant specific radioactivity from 5 to 40min after the begining of incubation. The specific radioactivity in successive 21 hr-incubation at 3°C tended to decrease gradually with incubation time. The adrenal homogenate, after the termination of incubation, had significantly lower specific radioactivity than those of the dialyzates. The incubation of adrenals with [3H] cholesterol solubilized in rat serum indicated gradual decrease of specific radioactivity of medium corticosterone along with the incubation time, suggesting a preferential release of newly synthesized corticosterone from the exogenous precursor.<BR>In addition to free corticosterone, rat adrenal contains corticosterone bound to organelles. A significant part of dialyzable or free corticosterone might have originated from a loosely bound form of corticosterone, while nondialyzable corticosterone appears to be tightly bound form. Transformation between bound and free form might play a role for secretion mechanism of adrenal corticosterone. The binding of corticosterone to macromolecules in the adrenal subcellular fractions would be related not only to storage but also to secretion mechanism of adrenal corticosterone.

• 社団法人 日本内分泌学会の論文

著者

• INABA Minoru

  Division of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University

• KAMATA KUNIE

  Division of Bio-Function Research, Biomedical Research Laboratory, Jikei University School of Medici

• INABA MINORU

  Division of Bio-Function Research, Biomedical Research Laboratories, Jikei University School of Medicine

• KAMATA KUNIE

  Division of Bio-Function Research, Biomedical Research Laboratories, Jikei University School of Medicine

• KAMATA KUNIE

  Division of Bio-Function Research, Biomedical Research Laboratory, Jikei University School of Medicine

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