title: Periaqueductal gray knockdown of V2, not V1a and V1b receptor influences nociception in the rat. yj6676@yahoo.com.
abstract: Our pervious study has proved that arginine vasopressin (AVP) in periaqueductal gray (PAG) plays a role in antinociception. After establishing a model of local special gene knockdown, the nociceptive effect of vasopressin receptor subunit in PAG was investigated in the rat. Microinjection of short-interfering RNA (siRNA) into PAG, which targeted vasopressin receptor subtypes (V(1a), V(1b) and V(2)), locally weakened the associated mRNA expression and depressed the related receptor synthesis in a dose-dependent manner, in which the significant inhibitive effect occurred on from 7th day to 14th day following 1microg or 2microg siRNA administration. PAG knockdown of V(2) receptor gene markedly decreased pain threshold in from 6th day to 13th day after siRNA administration, whereas local knockdown of either V(1a) or V(1b) receptor gene could not influence pain threshold. The data suggest that V(2) rather than V(1a) and V(1b) receptor in PAG involves in nociception.
authors.affiliation: Institute for Pharmaceuticals and Medical Science, Guangdong Bangmin Pharmaceutical Co. Ltd., Jianhai Distract, Jiangmen, Guangdong 529000, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.forename: Yu
authors.initials: Y
authors.lastname: Yang
authors.forename: Jian-Min
authors.initials: JM
authors.lastname: Chen
authors.forename: Gen
authors.initials: G
authors.lastname: Wang
authors.forename: Hong-Tao
authors.initials: HT
authors.lastname: Xu
authors.forename: Wen-Yan
authors.initials: WY
authors.lastname: Liu
authors.forename: Bao-Cheng
authors.initials: BC
authors.lastname: Lin
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D015153:Blotting, Western / Q000379:methods; D004305:Dose-Response Relationship, Drug; D015870:Gene Expression / Q000187:drug effects; D007150:Immunohistochemistry / Q000379:methods; D008297:Male; D008845:Microinjections / Q000379:methods; D010147:Pain Measurement / Q000187:drug effects / Q000379:methods; D017288:Pain Threshold / Q000187:drug effects*; D010487:Periaqueductal Gray / Q000187:drug effects / Q000502:physiology*; D034741:RNA, Small Interfering / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D017483:Receptors, Vasopressin / Q000145:classification / Q000235:genetics / Q000502:physiology*; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D013997:Time Factors
chemical_list: D034741:RNA, Small Interfering; D017483:Receptors, Vasopressin