Non-peptidic delta-opioid receptor antagonists suppress mitogen-induced tryptophan degradation in peripheral blood mononuclear cells in vitro.

Abstract:

:Opioid receptors are expressed not only on neuroendocrine cells but also on immunocompetent cells such as lymphocytes, monocytes and macrophages. micro-Opioid receptor agonists were found to exert immunosuppressive effects, whereas delta-opioid receptor agonists have been shown to act as immunostimulants. delta-Opioid receptor agonists stimulate T and B cells and activate granulocytes and monocytes, conversely, immunostimulation can be blocked by the non-peptidic delta-opioid receptor antagonist (NTI). We investigated the impact of NTI and of the two structurally related compounds HS-378 and HS-459 on degradation of tryptophan and formation of neopterin in mitogen-stimulated human peripheral blood mononuclear cells (PBMC). Both these biochemical pathways were found to be suppressed by all three opioid receptor antagonists, HS-378 and HS-459 exhibiting slightly greater potency than NTI. The suppression of tryptophan degradation suggests that the tested delta-opioid antagonists are able to influence the serotonergic system via a non-opioid action.

journal_name

Immunol Lett

journal_title

Immunology letters

authors

Jenny M,Winkler C,Spetea M,Schennach H,Schmidhammer H,Fuchs D

doi

10.1016/j.imlet.2008.03.006

subject

Has Abstract

pub_date

2008-06-15 00:00:00

pages

82-7

issue

1

eissn

0165-2478

issn

1879-0542

pii

S0165-2478(08)00091-6

journal_volume

118

pub_type

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