Hypothalamic dopamine-beta-hydroxylase activity: fluctuations with time of day and their modifications by intracranial surgery, adrenalectomy, and pinealectomy.

Abstract:

:Hypothalamic and plasma dopamine-beta-hydroxylase [DBH, EC 1.14.2.1] activites were measured by a coupled radioenzymatic method. Animals representing five experimental groups [intact controls, adrenalectomized, pinealectomized, adrenalectomized pinealectomized, doubly sham-operated] were killed and sampled at 8 times through the 24-hr daily cycle, 15 days postoperation, and at 50-52 days of age. Hypothalamic DBH in intact control animals had statistically significant fluctuations in relation to time of day. These changes were lost or dampened in groups that had had intracranial surgery and were characteristically shifted by adrenalectomy, either alone or with pinealectomy. Plasma DBH fluctuations in the same animals resembled those in hypothalamus in some features (e.g., peak near mid-dark; shift in daily maxima and minima after adrenalectomy) and differed in others [e.g., no effect of intracranial surgery or of sham operation; adrenalectomized pinealectomized animals resembled the solely pinealectomized]. Although temporal patterns in hypothalamic DBH activity thus differed in the experimental animal groups, the daily means of hypothalamic DBH activity were similar.

journal_name

Neurochem Res

journal_title

Neurochemical research

authors

Banerji TK,Quay WB,Kachi T

doi

10.1007/BF00965575

subject

Has Abstract

pub_date

1978-06-01 00:00:00

pages

281-93

issue

3

eissn

0364-3190

issn

1573-6903

journal_volume

3

pub_type

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