Spinal Cord Adenosine Receptor Stimulation in Rats Inhibits Peripheral Neutrophil Accumulation. The Role of N-methyl-D-aspartate Receptors

Overview

Journal J Clin Invest

Specialty General Medicine

Date 1996 Dec 15

PMID 8981924

Citations 18

Authors

G W Bong

S Rosengren

G S Firestein

Affiliations

Soon will be listed here.

Abstract

The effect of spinal adenosine receptor ligation on peripheral leukocyte accumulation was studied in two rat models of inflammation. Neutrophil infiltration into dermal inflammatory sites was signficantly reduced by adenosine A1 receptor agonists injected through intrathecal catheters. These effects were reversed by N-methyl-D-aspartate (NMDA), and were mimicked by (+/-)-2-amino-5-phosphonopentanoic acid (AP-5), a glutamate NMDA receptor antagonist. Peripheral adenosine levels, as measured in air pouch exudates, decreased markedly in inflamed pouches but remained near normal after intrathecal treatment with AP-5. Moreover, the antiinflammatory effects of intrathecal A1 receptor agonists and AP-5 were reversed by an adenosine A2 receptor antagonist administered intraperitoneally. Hence, central NMDA receptor activity can regulate neutrophil accumulation in peripheral inflammatory sites by reducing local levels of adenosine, an antiinflammatory autacoid which inhibits neutrophil function through A2 receptor activation. This represents a previously unknown pathway by which the central nervous system influences inflammatory responses.

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