Phospholipase Cbeta 3 mediates the scratching response activated by the histamine H1 receptor on C-fiber nociceptive neurons.
Phospholipase Cbeta (PLCbeta) isozymes represent a family of molecules that link G protein-coupled receptors (GPCRs) to an intracellular signaling network. Here, we investigated the function of PLCbeta isozymes in sensory neurons by using mutant mice deficient for specific PLCbeta family members. Expression analysis indicated that PLCbeta3, one of the four isoforms, is predominantly expressed in a subpopulation of C-fiber nociceptors. A subset of these neurons expressed the histamine H1 receptor. Ca(2+) imaging studies revealed that PLCbeta3 specifically mediates histamine-induced calcium responses through the histamine H1 receptor in cultured sensory neurons. In line with this, we found that PLCbeta3(-/-) mice showed significant defects in scratching behavior induced by histamine; histamine-trifluoromethyl-toluidine (HTMT), a selective H1 agonist; and compound 48/80, a mast cell activator. These results demonstrate that PLCbeta3 is required to mediate "itch" sensation in response to histamine acting on the histamine H1 receptor in C-fiber nociceptive neurons.
Han
Sang-Kyou
SK
Division of Biology, 147-75, California Institute of Technology, Pasadena, California 91125, USA.
Mancino
Valeria
V
Simon
Melvin I
MI
D000818:Animals; D020013:Calcium Signaling / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured; D004195:Disease Models, Animal; D005260:Female; D005727:Ganglia, Spinal / Q000187:drug effects / Q000378:metabolism*; D006632:Histamine / Q000378:metabolism / Q000494:pharmacology; D017442:Histamine Agonists / Q000494:pharmacology; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism*; D008297:Male; D008407:Mast Cells / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D036421:Nerve Fibers, Unmyelinated / Q000187:drug effects / Q000378:metabolism*; D009475:Neurons, Afferent / Q000187:drug effects / Q000378:metabolism*; D009619:Nociceptors / Q000187:drug effects / Q000378:metabolism*; D054799:Phospholipase C beta; D011537:Pruritus / Q000139:chemically induced / Q000378:metabolism / Q000503:physiopathology; D051381:Rats; D017208:Rats, Wistar; D011969:Receptors, Histamine H1 / Q000187:drug effects / Q000378:metabolism*; D012018:Reflex / Q000187:drug effects / Q000502:physiology; D020426:Sciatic Neuropathy / Q000378:metabolism / Q000503:physiopathology; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology; D010738:Type C Phospholipases / Q000235:genetics / Q000378:metabolism*
D017442:Histamine Agonists; D007527:Isoenzymes; D011969:Receptors, Histamine H1; D006632:Histamine; D010738:Type C Phospholipases; D054799:Phospholipase C beta