Opioid receptor-mediated suppression of humoral immune response in vivo and in vitro: involvement of kappa opioid receptors.

Abstract:

:The selective kappa opioid receptor agonist MR 2034 exerted pronounced suppression of plaque-forming cell (PFC) response following intraperitoneal (i.p.) administration in the rat. Pretreatment with preferential kappa and mu opioid receptor antagonists MR 2266 and naloxone, respectively, revealed that this effect was mediated mainly by kappa, and to a low extent by mu opioid receptors. Intracerebroventricular (i.c.v.) administration of quaternary naltrexone (QNtx) moderately attenuated, whereas i.p. given QNtx completely prevented the suppressive effect of MR 2034, suggesting a peripheral mechanism of action, and only minor involvement of brain opioid receptors. MR 2034 markedly decreased the PFC response of spleen cells obtained from in vivo immunized rats, treated in vitro with the opiate. The immunosuppressive action of MR 2034 in vitro was completely and partially blocked by equimolar concentrations of MR 2266 and naloxone, respectively. Antagonists alone produced stimulation of PFC following i.p. administration in the rat, but did not affect PFC response upon in vitro treatment. These results suggest that peripheral kappa opioid receptors down-regulate primary humoral immune response in the rat, and that this effect may be produced by direct interference with plasma cell activity.

journal_name

J Neuroimmunol

authors

Radulović J,Miljević C,Djergović D,Vujić V,Antić J,von Hörsten S,Janković BD

doi

10.1016/0165-5728(94)00161-g

subject

Has Abstract

pub_date

1995-03-01 00:00:00

pages

55-62

issue

1-2

eissn

0165-5728

issn

1872-8421

pii

0165-5728(94)00161-G

journal_volume

57

pub_type

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