title: Bovine adrenal medulla 22 reverses antinociceptive morphine tolerance in the rat.
abstract: Acute intrathecal (i.t.) bovine adrenal medulla 22 (BAM22, 10 nmol), an endogenous opioid peptide, induced equipotent thermal antinociception in naïve and morphine-tolerant rats while chronic BAM22 resulted in hyperalgesia and decrease in the effectiveness of antinociception. In rats made tolerant to morphine, prior administration of BAM22 (10 nmol, i.t.) significantly resumed antinociceptive response of morphine. The present study demonstrated that BAM22 was able to modulate maintenance of morphine tolerance.
authors.affiliation: Department of Anatomy and Physiology, Bioengineering School, Fujian Normal University, Fuzhou, Fujian 350000, People's Republic of China.
authors.forename: Jianping
authors.initials: J
authors.lastname: Jiang
authors.forename: Jian
authors.initials: J
authors.lastname: Huang
authors.forename: Yanguo
authors.initials: Y
authors.lastname: Hong
mesh_terms: D000465:Algorithms; D000701:Analgesics, Opioid / Q000037:antagonists & inhibitors* / Q000494:pharmacology*; D000818:Animals; D002417:Cattle; D004361:Drug Tolerance; D004744:Enkephalin, Methionine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology; D006930:Hyperalgesia / Q000139:chemically induced / Q000523:psychology; D007278:Injections, Spinal; D008297:Male; D009020:Morphine / Q000037:antagonists & inhibitors* / Q000494:pharmacology*; D010147:Pain Measurement / Q000187:drug effects; D011498:Protein Precursors / Q000008:administration & dosage / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017450:Receptors, Opioid, mu / Q000187:drug effects
chemical_list: D000701:Analgesics, Opioid; D011498:Protein Precursors; D017450:Receptors, Opioid, mu; D004744:Enkephalin, Methionine; C028837:BAM 22P; D009020:Morphine