Role played by brainstem neurons in regulating testosterone secretion via a direct neural pathway between the hypothalamus and the testes.

Abstract:

:We previously reported anatomical and functional evidence for a direct, inhibitory neural pathway that regulates testosterone (T) secretion independently of the pituitary. This pathway is activated by the intracerebroventricular (icv) administration of agents that stimulate stress responses, such as IL-1beta, corticotropin-releasing factor (CRF), and norepinephrine (NE), which results in a blunted T response to the administration of human chorionic gonadotropin (hCG). Blunting of the T response is mediated by central beta-adrenergic receptor stimulation. CRF, but not ethanol (EtOH) or IL-1beta, acts directly on the paraventricular nucleus of the hypothalamus to activate the pathway. Here we explored the role played by brain areas hypothesized to be part of this pathway, such as neurons in the dorsal pons [including the locus coeruleus (LC) of the brainstem], where NE is produced. Microinfusion of EtOH or IL-1beta, but not CRF, into these neurons activated the pathway. Electrolytic lesions of this region significantly reversed the inhibitory effect of icv-administered EtOH on hCG-induced T release, while having no effect on the ability of IL-1beta or CRF to do so. However, the icv administration of IL-1beta, EtOH, or CRF, in doses that rapidly inhibit the T response to hCG, all caused a significant depletion of NE from the LC. Collectively, these results indicate that in addition to the paraventricular nucleus, the brainstem area containing the LC is part of a neural pathway that connects the brain to the testes independently of the pituitary. We also speculate that EtOH may stimulate this pathway through NE-dependent activation of the dorsal pons.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Selvage DJ,Parsons L,Rivier C

doi

10.1210/en.2005-1358

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

3070-5

issue

6

eissn

0013-7227

issn

1945-7170

pii

en.2005-1358

journal_volume

147

pub_type

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