Opioid and cannabinoid receptor-mediated regulation of the increase in adrenocorticotropin hormone and corticosterone plasma concentrations induced by central administration of delta(9)-tetrahydrocannabinol in rats.

Abstract:

:The purpose of this study was to investigate the cannabinoid and opioid mediated regulation on the effects of central Delta(9)-tetrahydrocannabinol (Delta(9)-THC) administration on hypothalamus-pituitary-adrenal (HPA) axis activity in the male rat. Intracerebroventricular (i.c.v.) administration of delta(9)-THC (25, 50, 100 microg/rat) markedly increased plasma adrenocorticotropin hormone (ACTH) and corticosterone concentrations. Time course effect studies revealed that both hormones secretion peaked at 60 min after Delta(9)-THC i.c.v. administration (50 microg/rat), decreased gradually and returned to baseline levels by 480 min. The i.c.v. administration of the specific cannabinoid receptor antagonist SR-141716A (3 microg/rat) significantly attenuated the increase of both hormones secretion induced by Delta(9)-THC (50 microg/rat). Nevertheless, higher doses (12.5 and 50 microg/rat) of this compound increased both ACTH and corticosterone plasma concentrations. Subcutaneous (s.c.) administration with the opiate receptor antagonist naloxone (0.3 mg/kg) was without effect but significantly diminished the increase of both hormones secretion induced by Delta(9)-THC (50 microg/rat). Taken together, these results indicate that opiate and cannabinoid receptors are involved in the activation of the HPA axis induced by Delta(9)-THC. Furthermore, the increase of ACTH and corticosterone secretion after the administration of higher doses of SR-141716A than those required to block such activation, suggests that endogenous cannabinoids are tonically inhibiting the release of both hormones or that this agonist-like activity may be part of an uncharacterized action of this compound not mediated by cannabinoid receptors.

journal_name

Brain Res

journal_title

Brain research

authors

Manzanares J,Corchero J,Fuentes JA

doi

10.1016/s0006-8993(99)01756-4

subject

Has Abstract

pub_date

1999-08-21 00:00:00

pages

173-9

issue

1

eissn

0006-8993

issn

1872-6240

pii

S0006-8993(99)01756-4

journal_volume

839

pub_type

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