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Biology of Reproduction, Vol 6, 238-243, Copyright © 1972 by Society for the Study of Reproduction

Hydroxyindole-O-Methyl Transferase Activity of Male Rat Pineal Glands Following Hypophysectomy and HGG Treatment

RONALD L. URRY 1, DELON W. BARFUSS 1, , and LEGRANDE C. ELLIS 1

1 Department of Zoology and Division of Biochemistry Utah State University, Logan, Utah 84321


The influence of hypophysectomy and HCG on HIOMT activity (EC 2.1.1.4) of pineal glands from male rats was investigated with respect to age. Hypophysectomy of immature rats resulted in decreased body weights, decreased accessory organ weights, decreased pineal gland weights and decreased HIOMT activity. Hypophysectomy of mature rats resulted in decreased body weights, decreased accessory organ weights, decreased pineal gland weights, but did not alter HIOMT activity. HIOMT activity, when expressed on a per 100 g body wt basis, was elevated by hypophysectomy for the 3-week-old animals killed at 10 weeks of age, but not for those rats killed at 7.5-weeks of age. Hypophysectomy of 10-week-old rats increased HIOMT activity of the pineal glands from animals killed when 13-weeks of age, but not for animals killed at 11 weeks of age. This physiological increase in HIOMT activity due to large losses in body mass points out the need for considering differentials in brain-body development or body weight losses after various experimental conditions in assessing pineal function. Decreases in HIOMT activity of the control animals of this investigation correlated well with previously observed age changes in HIOMT activity.

Submitted on July 22, 1971






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Copyright © 1972 by the Society for the Study of Reproduction.