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Differential alterations by chronic treatment with morphine of pro-opiomelanocortin mRNA levels in anterior as compared to intermediate pituitary lobes of rats

Authors
Journal
Neuropeptides
0143-4179
Publisher
Elsevier
Publication Date
Volume
5
Identifiers
DOI: 10.1016/0143-4179(85)90059-9

Abstract

Abstract Chronic treatment of rats with morphine by implantation of pellets over a period of 10 days resulted in a differential alteration of pro-opiomelanocortin (POMC) mRNA levels in individual pituitary lobes: Hybridisation studies using a 32P-labelled mouse POMC cDNA fragment of 150 bases as a probe revealed that chronic morphine treatment causes about 50% enhancement of POMC mRNA levels in the anterior lobe and about 40% decrease in the intermediate lobe of the pituitary. Significant changes were observed 3 days following commencement of administration and persisted over the rest of the morphine treatment.

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