Changes in the activity of angiotensin-converting enzyme in the structures of the hypothalamicpituitary- adrenocortical system and the function of the adrenal cortex of rats under the conditions of methanandamide action
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Keywords

angiotensin-converting enzyme, hypothalamicpituitary- adrenocortical system, methanandamide, corticosteroids.

How to Cite

Kalyns’ka, L., Kovzun, O., & Levchuk, N. (2019). Changes in the activity of angiotensin-converting enzyme in the structures of the hypothalamicpituitary- adrenocortical system and the function of the adrenal cortex of rats under the conditions of methanandamide action. Endokrynologia, 24(3), 264-270. https://doi.org/10.31793/1680-1466.2019.24-3.264

Abstract

Aim was to investigate the influence of methanandamide — a metabolically stable derivative of endocannabinoid N-arachidonoiletanolamine on the activity of angiotensin-converting enzyme (ACE), an enzyme for the synthesis of angiotensin II in the centers for regulating the hypothalamic-pituitary-adrenocortical
system (HPAS), in blood plasma of rats. Material and methods. The ACE activity in the hypothalamus, the adenohypophysis, the adrenal glands and blood plasma of rats was determined with a fluorometric method using Benzoyl-Gly-His-Leu (Sigma, USA) as substrate. The content of 11-hydroxycorticosteroids
(11-HCS) in rat blood plasma was determined using a fluorometric micro-method. Results. The activity of ACE in the central links of HPAS — the hypothalamus and the adenohypophysis was increased in one hour after a single administration of methanandamide at doses of 0.2 and 0.02 mg/kg to intact rats; ACE activity in the adrenal glands and the efficacy of circulating enzyme in the blood were reduced. Increased levels of 11-HCS in rat plasma blood were revealed under the conditions of single administration of methanandamide in a dose of 0.2 mg/kg to intact rats; administration of low dose of methanandamide — 0.02 mg/kg did not lead to a significant change in the corticosteroid level in the blood of animals. Conclusion. Exogenous cannabinoids modulate the activity of the angiotensin system at various links of HPAS, stimulating the ACE activity in the hypothalamus and the adenohypophysis, and reducing the enzyme activity in the adrenal glands and blood plasma in 1 hour after administration of a single dose of methanandamide to intact rats. Due to corticotropin-releasing activity of hypothalamus and adenohypophysis angiotensines, increased ACE activity in these structures may be one of the important factors in the HPAS activation, in particular, corticosteroid synthesis, caused by a single administration of high doses of methanandamide.

https://doi.org/10.31793/1680-1466.2019.24-3.264
pdf (Українська)

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