Effect of Electrical Stimulation of the Neurohypophysis on ACTH Release in Rats with Hypothalamic Lesions
作者:
G.B. Makara,
E. Stark,
M. Kárteszi,
E. Fellinger,
G. Rappay,
D. Szabó,
期刊:
Neuroendocrinology
(Karger Available online 1980)
卷期:
Volume 31,
issue 4
页码: 237-243
ISSN:0028-3835
年代: 1980
DOI:10.1159/000123081
出版商: S. Karger AG
关键词: Corticotrophin-releasing factor;ACTH;Hypothalamic lesion;Neurohypophysis;Electrical stimulation
数据来源: Karger
摘要:
Electrical stimulation of the neural lobe (NL) of the pituitary induces a rise in plasma corticosterone indicating the release of adrenocorticotropin (ACTH) in rats pretreated with dexamethasone, morphine and pentobarbitone. 7–8 days after placing an anterolateral cut around the medial basal hypothalamus (MBH), the rats failed to respond with ACTH release to electrical stimulation of the NL; the number of nerve fibers and terminals in the NL decreased to less than 5% of the normal; and ACTH releasing activity of acid extracts of the NL was undetectable using both in vivo and in vitro tests, which are insensitive to vasopressin. After lesions of the paraventricular nuclei the stimulation of the NL elicited a rise of plasma corticosterone that was significantly less than that in the controls. These results suggest that the NL of the pituitary contains electrically excitable fibers capable of releasing corticotropin-releasing factor (CRF; distinct from vasopressin) and that these fibers probably originate from outside the MBH, witha portion of them coming from or through the paraventricular nuclei or their immediate vicinit
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