Differential alteration of functions of rat peritoneal macrophages responsive to endogenous opioid peptide endomorphin-1.

Abstract:

:Endomorphin-1 is a recently isolated endogenous opioid peptide, and potent and selective high affinity mu-opioid receptor agonist. We evaluate the role of endomorphin-1 on macrophage functions. Endomorphin-1 potentiated macrophage adhesion and the expression of adhesion molecule Mac-1 on macrophages. However, endomorphin-1 did not alter phagocytosis of Escherichia coli by macrophages. Moreover, endomorphin-1 inhibited macrophage chemotaxis and the production of superoxide anion by macrophages. On the contrary, endomorphin-1 inhibited TNF-alpha production by macrophages stimulated with both LPS and PMA, respectively. Similarly, endomorphin-1 suppressed IL-10 and IL-12 productions in response to LPS. In contrast, endomorphin-1 potentiated IL-1beta production by macrophages stimulated with PMA. These results suggest that endomorphin-1 may alter macrophage functions such as cytokine productions and functions related to natural host defense.

journal_name

Int Immunopharmacol

authors

Inui Y,Azuma Y,Ohura K

doi

10.1016/s1567-5769(02)00065-6

keywords:

subject

Has Abstract

pub_date

2002-07-01 00:00:00

pages

1133-42

issue

8

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(02)00065-6

journal_volume

2

pub_type

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