Title

Effects of chronic clomipramine on central DADLE antinociception

Document Type

Article

Publication Date

1990

Abstract

Equipotent antinociceptive doses, as determined by a tail-flick response, for centrally administered (periaqueductal gray) morphine (M) and d-Ala2, d-Leu5 enkephalin (DADLE) were established as 5 μg and 19 μg, respectively. Chronic (28 day) subcutaneous infusion of clomipramine (CMI) via an Alzet minipump attenuated both central M-and DADLE-induced analgesia by day 15; attenuation persisted for the duration of the infusion (day 29). Within 7 days following removal of the pump, antinociceptive responses to M and DADLE returned to near pre-CMI Ievels. Our results indicate a similarity between M and DADLE with regard to attenuation of their antinociceptive action by chronic CMI. This attenuation may be due to decreased mu opioid receptor sensitivity or density resulting from chronic tricyclic antidepressant administration. © 1990.

Publication Title

Pain

Volume

42

Issue

3

First Page

331

Last Page

336

Comments

This article was published in Pain, Volume 42, Issue 3, Pages 331-336.

The published version is available at http://dx.doi.org/10.1016/0304-3959(90)91146-A.

Copyright © 1990.

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