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Plasma aldosterone concentrations in Rana catesbeiana tadpoles during metamorphosis were determined by radioimmunoassay. Aldosterone levels were relatively low (0.7-1.4 ng/ml) during pre- and prometamorphosis. At the onset of climax, aldosterone concentration increased markedly and reached a peak (10.9 ng/ml) at stage XXII. Subsequently, aldosterone levels declined and at the end of metamorphosis (stage XXV), the average concentration was 3.9 ng/ml plasma. Administration of ACTH elevated plasma aldosterone levels in hypophysectomized tadpoles. When hypophysectomized animals were kept in thyroxine (T4), plasma aldosterone concentrations also increased. Combined ACTH and T4 treatment caused a marked increase in plasma aldosterone concentration. The possible involvement of thyroid hormone in the elevation of plasma aldosterone during metamorphosis is discussed.
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October 1981,
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S Kikuyama, and
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S Kikuyama, and
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General and comparative endocrinology,
S Kikuyama, and
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Oecologia,
S Kikuyama, and
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Comparative biochemistry and physiology. Part A, Molecular & integrative physiology,
S Kikuyama, and
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April 1973,
Zeitschrift fur Zellforschung und mikroskopische Anatomie (Vienna, Austria : 1948),
S Kikuyama, and
M R Suzuki, and
S Iwamuro
September 1985,
Endocrinology,
S Kikuyama, and
M R Suzuki, and
S Iwamuro
January 1985,
Endocrinology,
S Kikuyama, and
M R Suzuki, and
S Iwamuro
December 1976,
General and comparative endocrinology,
