title: Attenuated pain responses in mice lacking Ca(V)3.2 T-type channels.
abstract: Although T-type Ca(2+) channels are implicated in nociception, the function of specific subtypes has not been well defined. Here, we compared pain susceptibility in mice lacking Ca(V)3.2 subtype of T-type Ca(2+) channels (Ca(V)3.2(-/-)) with wild-type littermates in various behavioral models of pain to explore the roles of Ca(V)3.2 in the processing of noxious stimuli in vivo. In acute mechanical, thermal and chemical pain tests, Ca(V)3.2(-/-) mice showed decreased pain responses compared to wild-type mice. Ca(V)3.2(-/-) mice also displayed attenuated pain responses to tonic noxious stimuli such as intraperitoneal injections of irritant agents and intradermal injections of formalin. In spinal nerve ligation-induced neuropathic pain, however, behavioral responses of Ca(V)3.2(-/-) mice were not different from those of wild-type mice. The present study reveals that the Ca(V)3.2 subtype of T-type Ca(2+) channels are important in the peripheral processing of noxious signals, regardless of modality, duration or affected tissue type.
authors.affiliation: Center for Neural Science, Division of Life Sciences, Korea Institute of Science and Technology, Seoul, Korea.
authors.forename: S
authors.initials: S
authors.lastname: Choi
authors.forename: H S
authors.initials: HS
authors.lastname: Na
authors.forename: J
authors.initials: J
authors.lastname: Kim
authors.forename: J
authors.initials: J
authors.lastname: Lee
authors.forename: S
authors.initials: S
authors.lastname: Lee
authors.forename: D
authors.initials: D
authors.lastname: Kim
authors.forename: J
authors.initials: J
authors.lastname: Park
authors.forename: C-C
authors.initials: CC
authors.lastname: Chen
authors.forename: K P
authors.initials: KP
authors.lastname: Campbell
authors.forename: H-S
authors.initials: HS
authors.lastname: Shin
mesh_terms: D000818:Animals; D020747:Calcium Channels, T-Type / Q000235:genetics / Q000502:physiology*; D006358:Hot Temperature; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D020422:Mononeuropathies / Q000150:complications / Q000378:metabolism; D010146:Pain / Q000145:classification / Q000150:complications / Q000235:genetics / Q000378:metabolism*; D017288:Pain Threshold / Q000502:physiology*; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology*; D013127:Spinal Nerves / Q000293:injuries; D013314:Stress, Mechanical
chemical_list: C504883:Cacna1h protein, mouse; D020747:Calcium Channels, T-Type