Identification of uridine 5'-triphosphate receptor mRNA in rat cochlear tissues.
Previous investigations have reported the presence of uridine 5'-triphosphate (UTP) and adenosine 5'-triphosphate (ATP) receptors triggering phospholipase C (PLC) activation in the frog semicircular canal. The aim of this work was to characterize the molecular subtypes of these nucleotide receptors. Due to the lack of molecular tools for purinoceptors in amphibia, this study was performed on the rat. The stria vascularis, organ of Corti and spiral ligament were microdissected from Long Evans rat cochlea. RNA was extracted from four cochleas and polymerase chain reaction (PCR) was performed after reverse transcription (RT) using oligonucleotides for sequences of P2Y1, P2Y2, P2Y4 and P2Y6 receptors. Various tissues were used as negative controls (testis for P2Y1 and P2Y6 receptors, brain for P2Y2 and P2Y4 receptors and liver for P2Y4 receptors). Data show the expression of the four transcripts in the stria vascularis, organ of Corti and spiral ligament. When results were normalized to the signal obtained with S14 mRNA, a ribosomal protein used as an internal standard, expressions were similar in the three structures. In conclusion, these results demonstrate the mRNA expression of the three UTP receptors (P2Y2, P2Y4 and P2Y6) and of the P2Y1 ATP receptor in both sensory and secretory structures of the rat inner ear. Their functional roles remain to be defined.
Teixeira
M
M
INSERM U.426, Faculté de Médecine Xavier Bichat, Paris, France.
Butlen
D
D
Ferrary
E
E
Sterkers
O
O
Escoubet
B
B
D000818:Animals; D003051:Cochlea / Q000378:metabolism*; D015870:Gene Expression / Q000502:physiology; D008297:Male; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000235:genetics*; D051381:Rats; D020318:Rats, Long-Evans; D011956:Receptors, Cell Surface / Q000235:genetics*; D018048:Receptors, Purinergic P2 / Q000235:genetics; D058472:Receptors, Purinergic P2Y1; D058473:Receptors, Purinergic P2Y2
C546384:P2ry1 protein, rat; C546387:P2ry2 protein, rat; D012333:RNA, Messenger; D011956:Receptors, Cell Surface; D018048:Receptors, Purinergic P2; D058472:Receptors, Purinergic P2Y1; D058473:Receptors, Purinergic P2Y2; C104749:purinoceptor P2Y4; C099845:purinoceptor P2Y6; C074644:uridine triphosphate receptors