Hypericum perforatum differentially affects corticosteroid receptor-mRNA expression in human monocytic U-937 cells.

Abstract:

:A dysregulation of the hypothalamic-pituitary-adrenocortical (HPA) axis represents a prominent finding in major depression, possibly related to a dysfunction of the corticosteroid receptor system. Antidepressants are involved in the restoration of the altered feed-back mechanism of the HPA-axis, probably via normalization of corticosteroid receptor functions. Since Hypericum perforatum has antidepressive properties, we here examined its putative actions on glucocorticosteroid receptor mRNA levels in human blood cells as a peripheral model for neuroendocrine effects in human brain cells. Our data show that Hypericum (LI 160) affects the cellular mRNA levels of both, the glucocorticoid receptor (GR)-α and its inhibitory counterpart, the GR-β, at clinically-relevant concentrations. Under these conditions, a bimodal effect was observed. Dose-response studies suggest a rather small effective concentration range and time-effect data show a primary and transient up-regulation of GR-α mRNA levels and a down-regulation of GR-β mRNA levels after 16 h of treatment. The sodium channel blocker benzamil neutralized the effects of Hypericum, pointing to an at least partial mechanism of action via this pathway. In conclusion, Hypericum treatment differentially affects GR-mRNA levels in the human system. Our data suggest a bimodal effect on GR, resulting in a time-and dose-related modification of GR-mediated cellular effects. Such a mechanism has been alleged as an important way of action for a number of antidepressants. It is the first time that a specific effect on both receptors, especially on the subtype of GR-β, is shown under antidepressive treatment in a human system under in vitro conditions.

journal_name

J Psychiatr Res

authors

Enning F,Murck H,Krieg JC,Vedder H

doi

10.1016/j.jpsychires.2011.03.007

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

1170-7

issue

9

eissn

0022-3956

issn

1879-1379

pii

S0022-3956(11)00056-2

journal_volume

45

pub_type

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