Biphasic Changes in Anterior Pituitary Met-Enkephalin Concentration following Reserpine Treatment
作者:
Sophie Papas,
Seon Ho Shin,
Marc Claude Obonsawin,
期刊:
Neuroendocrinology
(Karger Available online 1988)
卷期:
Volume 47,
issue 2
页码: 149-153
ISSN:0028-3835
年代: 1988
DOI:10.1159/000124905
出版商: S. Karger AG
关键词: Met-enkephalin;Anterior pituitary;Reserpine;Biphasic changes;Monoamines
数据来源: Karger
摘要:
Met-enkephalin concentrations in the anterior pituitary gland were shown to decline dramatically within the first 24 h after reserpine treatment, with effects apparent as early as 6 h. This was followed by subsequent repletion and late augmentation of Met-enkephalin levels 3 weeks following reserpine. Treatment with the alpha-1-adrenergic agonist me-thoxamine had no effect, whereas the alpha-1-antagonist prazosin lowered Met-enkephalin concentrations. Treatment with the dopamine agonists bromocriptine or apomorphine had no effect, but haloperidol treatment increased anterior pituitary Met-enkephalin which was reversed by concomitant bromocriptine administration. We postulate that the changes in anterior pituitary Met-enkephalin following reserpine were related to alterations in the monoamine neurotran-smitters. Adrenergic and dopaminergic mechanisms may have opposing roles in the maintenance of Met-enkephalin concentrations in the anterior pituitary gland.
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