title: Arginine vasopressin enhances periaqueductal gray synthesis and secretion of enkephalin and endorphin in the rat.
abstract: Previous study has proven that arginine vasopressin (AVP) enhances periaqueductal gray (PAG) secreting enkephalin and endorphin in vivo in the rat. Present work investigated that AVP effect on PAG secretion and synthesis of enkephalin and endorphin in vitro. Radioimmunoassy results showed that AVP increased leucine-enkephalin (L-Ek), methionine-enkephalin (M-Ek), beta-endorphin (beta-Ep) rather than dynorphin A(1-13) (DynA(1-13)) concentrations in PAG slice culture liquid, and V(2) receptor antagonist: d(CH(2))(5)[D-Ile(2), Ile(4), Ala(9)-NH(2)]AVP decreased L-Ek, M-Ek and beta-Ep, not DynA(1-13) concentrations in PAG slice culture liquid in a dose-dependent manner, but V(1) receptor antagonist: d(CH(2))(5)Tyr(Me)AVP did not change these peptide concentrations in PAG slice culture liquid. RT-PCR data displayed that AVP enhanced proenkephalin and proopiomelanocortin (Pro-beta-Ep) rather than prodynorphin mRNA expressions in culture PAG tissues, and V(2) receptor antagonist weakened proenkephalin and proopiomelanocortin (Pro-beta-Ep), not prodynorphin mRNA expressions in culture PAG tissues, but V(1) receptor antagonist did not influence these mRNA expressions in culture PAG tissues. The data suggest that AVP enhances PAG synthesizing and secreting enkephalin and endorphin rather than dynorphin through V(2) receptors.
authors.affiliation: Institute for Pharmaceuticals and Medical Science, Guangdong Bangmin Pharmaceutical Co. Ltd., Jianghai Distract, Jiangmen, Guangdong 529000, China. yj6676@yahoo.com
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.forename: Yu
authors.initials: Y
authors.lastname: Yang
authors.forename: Hong-Tao
authors.initials: HT
authors.lastname: Xu
authors.forename: Jian-Min
authors.initials: JM
authors.lastname: Chen
authors.forename: Wen-Yan
authors.initials: WY
authors.lastname: Liu
authors.forename: Bao-Chen
authors.initials: BC
authors.lastname: Lin
mesh_terms: D000818:Animals; D065092:Antidiuretic Hormone Receptor Antagonists; D001127:Arginine Vasopressin / Q000031:analogs & derivatives / Q000378:metabolism* / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004723:Endorphins / Q000378:metabolism*; D004743:Enkephalin, Leucine / Q000378:metabolism; D004744:Enkephalin, Methionine / Q000378:metabolism; D004745:Enkephalins / Q000235:genetics / Q000378:metabolism*; D008297:Male; D009434:Neural Pathways / Q000187:drug effects / Q000378:metabolism*; D009924:Organ Culture Techniques; D010487:Periaqueductal Gray / Q000187:drug effects / Q000378:metabolism*; D011333:Pro-Opiomelanocortin / Q000235:genetics; D011498:Protein Precursors / Q000235:genetics; D012333:RNA, Messenger / Q000187:drug effects / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D017483:Receptors, Vasopressin / Q000378:metabolism; D015854:Up-Regulation / Q000187:drug effects / Q000502:physiology
chemical_list: D065092:Antidiuretic Hormone Receptor Antagonists; D004723:Endorphins; D004745:Enkephalins; D011498:Protein Precursors; D012333:RNA, Messenger; D017483:Receptors, Vasopressin; C029992:proenkephalin; D001127:Arginine Vasopressin; D004744:Enkephalin, Methionine; D004743:Enkephalin, Leucine; D011333:Pro-Opiomelanocortin