title: Markedly reduced chronic nociceptive response in mice lacking the PAC1 receptor.
abstract: The neuropeptide pituitary adenylate cyclase activating polypeptide (PACAP) has been proposed to have a role in nociception. Here we have used the formalin test, thermal laser stimulation and mechanical von Frey stimulation to investigate possible alteration of PAC1-/- mice nociceptive behaviour. Our finding, that PAC1-/- mice have a substantial, 75% decrease in nociceptive response during the late phase, provides clear evidence that the specific PACAP-receptor PAC1 is involved in the mediation of nociceptive responses during chronic conditions such as inflammation. PAC1-/- mice had small or no changes in the response to mechanical and thermal laser stimulation. This suggests a limited, if any, involvement of PAC1 in nociception after short-lasting stimuli. Injury-induced changes in DRG neuropeptide expression were more pronounced in PAC1-/- mice, implying neuroregulatory functions of PAC1.
authors.affiliation: Department of Physiological Sciences, BMC F10, Lund University, SE-221 84 Lund, Sweden.
authors.forename: H
authors.initials: H
authors.lastname: Jongsma
authors.forename: L M
authors.initials: LM
authors.lastname: Pettersson
authors.lastname: Zhang Yz
authors.forename: M K
authors.initials: MK
authors.lastname: Reimer
authors.forename: M
authors.initials: M
authors.lastname: Kanje
authors.forename: A
authors.initials: A
authors.lastname: Waldenström
authors.forename: F
authors.initials: F
authors.lastname: Sundler
authors.forename: N
authors.initials: N
authors.lastname: Danielsen
mesh_terms: D000818:Animals; D005260:Female; D005727:Ganglia, Spinal / Q000378:metabolism / Q000503:physiopathology; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D009479:Neuropeptides / Q000378:metabolism*; D018696:Neuroprotective Agents / Q000378:metabolism*; D010147:Pain Measurement / Q000379:methods; D017288:Pain Threshold / Q000502:physiology*; D051219:Pituitary Adenylate Cyclase-Activating Polypeptide; D051236:Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide; D051237:Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I; D011979:Receptors, Pituitary Hormone / Q000172:deficiency* / Q000235:genetics*; D012584:Sciatic Nerve / Q000503:physiopathology; D013116:Spinal Cord / Q000378:metabolism / Q000503:physiopathology
chemical_list: C495402:Adcyap1 protein, mouse; C495504:Adcyap1r1 protein, mouse; D009479:Neuropeptides; D018696:Neuroprotective Agents; D051219:Pituitary Adenylate Cyclase-Activating Polypeptide; D051236:Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide; D051237:Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I; D011979:Receptors, Pituitary Hormone