Chronic arthritis down-regulates peripheral mu-opioid receptor expression with concomitant loss of endomorphin 1 antinociception.

Abstract

OBJECTIVE To determine whether peripheral administration of the endogenous mu-opioid peptide endomorphin 1 could reduce knee joint pain, using animal models of acute and chronic arthritis. METHODS Extracellular electrophysiologic recordings were made of rat knee joint primary afferent nerve activity in response to noxious hyperrotation of the joint… (More)

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