title: The inhibitory effect of somatostatin receptor activation on bee venom-evoked nociceptive behavior and pCREB expression in rats.
abstract: The present study examined nociceptive behaviors and the expression of phosphorylated cAMP response element-binding protein (pCREB) in the dorsal horn of the lumbar spinal cord and the dorsal root ganglion (DRG) evoked by bee venom (BV). The effect of intraplantar preapplication of the somatostatin analog octreotide on nociceptive behaviors and pCREB expression was also examined. Subcutaneous injection of BV into the rat unilateral hindpaw pad induced significant spontaneous nociceptive behaviors, primary mechanical allodynia, primary thermal hyperalgesia, and mirror-thermal hyperalgesia, as well as an increase in pCREB expression in the lumbar spinal dorsal horn and DRG. Octreotide pretreatment significantly attenuated the BV-induced lifting/licking response and mechanical allodynia. Local injection of octreotide also significantly reduced pCREB expression in the lumbar spinal dorsal horn and DRG. Furthermore, pretreatment with cyclosomatostatin, a somatostatin receptor antagonist, reversed the octreotide-induced inhibition of the lifting/licking response, mechanical allodynia, and the expression of pCREB. These results suggest that BV can induce nociceptive responses and somatostatin receptors are involved in mediating the antinociception, which provides new evidence for peripheral analgesic action of somatostatin in an inflammatory pain state.
authors.affiliation: Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi 710061, China.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.affiliation: Medical Scientific Research Centre, Guangxi Medical University, Nanning, Guangxi 530021, China.
authors.forename: Rong
authors.initials: R
authors.lastname: Luo
authors.affiliation: Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi 710061, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi 710061, China.
authors.forename: Fanrong
authors.initials: F
authors.lastname: Yao
authors.affiliation: Department of Neural and Pain Sciences, University of Maryland Dental School, 650 West Baltimore Street, Baltimore, MD 21201, USA.
authors.forename: Dongyuan
authors.initials: D
authors.lastname: Cao
authors.affiliation: Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi 710061, China.
authors.forename: Shaojie
authors.initials: S
authors.lastname: Ma
authors.affiliation: Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi 710061, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi 710061, China.
authors.forename: Huisheng
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi 710061, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D000700:Analgesics / Q000008:administration & dosage; D000818:Animals; D001514:Bee Venoms; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism*; D006930:Hyperalgesia / Q000139:chemically induced / Q000188:drug therapy / Q000503:physiopathology*; D008297:Male; D015282:Octreotide / Q000008:administration & dosage*; D010146:Pain / Q000139:chemically induced / Q000188:drug therapy / Q000503:physiopathology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017481:Receptors, Somatostatin / Q000819:agonists* / Q000378:metabolism*; D013116:Spinal Cord / Q000187:drug effects / Q000378:metabolism*; D016896:Treatment Outcome
chemical_list: D000700:Analgesics; D001514:Bee Venoms; D017362:Cyclic AMP Response Element-Binding Protein; D017481:Receptors, Somatostatin; D015282:Octreotide