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Neural Lobe of Pituitary Modulates Corticotropin Release in the Rat^*

Department of Animal Biology, University of Geneva 1211 Geneva 4
Kinderspital Basel (J.B.B., J.G.), 4005 Basel, Switzerland 0

Address all correspondence and requests for reprints to: Dr. A. J. Baertschi, Department of Animal Biology, University of Geneva, 1211 Geneva 4, Switzerland.

Abstract

The hypothesis was tested that the neural lobe of the pituitary may modulate the release of anterior pituitary hormones. The neural lobe of anesthetized lactating rats was electrically stimulated at 30 Hz (5 sec on and 5 sec off) for 3 min whUe taking blood samples for RIA of ACTH. Plasma ACTH increased within 3 min by 22 ± 9% (average ± SEM; P < 0.025) in intact rats and by 38 ± 17% (P < 0.025) in rats where the nerve supply to the median eminence and neural lobe was interrupted. Electrical stimulation of the anterior pituitary was ineffective. No significant changes in plasma ACTH were observed in rats with coagulated hypophysial portal vessels or in Brattleboro rats with congenital diabetes insipidus. Apparently, neither peripheral plasma vasopressin (estimated at 150 µU/ml maximum) nor intermediate lobe ACTH could account for the observed rise in ACTH. Results suggest a vasopressin-dependent modulation of ACTH release by the neural lobe, mediated either by axon collaterals to the median eminence or by a vascular interconnection between posterior and anterior pituitaries. (Endocrinology 106: 878, 1980)

Footnotes

^* This work was supported by the Swiss National Science Foundation (Grant 3.248.0.77).

Received March 26, 1979.

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