Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8841469 | Neuroscience Letters | 2018 | 37 Pages |
Abstract
Pain management remains a major concern regarding the treatment of postoperative patients. Transient receptor potential (TRP) channels are considered to be new therapeutic targets for pain control. We investigated whether the genes Trpv1 and Trpv4 are involved in hind paw swelling caused after surgical incision in mice or in incision-induced Fos-like immunoreactivity (Fos-LI) levels in the central nervous system. Mice were divided into four groups: wild-type (WT) control, WT incision, Trpv1 knockout (Trpv1â/â) incision, and Trpv4 knockout (Trpv4â/â) incision. Mice were anesthetized, and only those in the incision, and not control, groups received a surgical incision to their right plantar hind paw. Changes in paw diameter and in Fos-LI levels in the dorsal horn of the spinal cord, paraventricular nucleus of the hypothalamus (PVN), paraventricular nucleus of the thalamus, and central amygdala were evaluated 2â¯h after the incision. There was no significant difference in the paw diameter among groups. In contrast, in laminae I-II of the dorsal horn of the spinal cord and PVN, Fos-LI was significantly higher in all incision groups than in the WT control group. A significant increase in Fos-positive cells was also observed in the dorsal horn laminae III-IV in Trpv1â/â and Trpv4â/â incision groups compared with the WT incision group. Our results indicate that surgical incision activates the PVN and that Trpv1 and Trpv4 might be involved in neuronal activity in the dorsal horn laminae III-IV after surgical incision.
Keywords
TrpTRPVs.c.4α-PDDTRPV4PFAi.p.TRPV1PBSTPVT4α-phorbol 12,13-didecanoateCeAFos-LICentral amygdalaFos-like immunoreactivityphosphate bufferIncisionintraperitonealsubcutaneouslycentral nervous systemSpinal cordphosphate-buffered saline containing 0.3% Triton X-100PVNHPAwild-typeParaventricular nucleus of the thalamusparaventricular nucleus of the hypothalamusparaventricular nucleusparaformaldehydetransient receptor potential vanilloidtransient receptor potential
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Authors
Yasuhito Motojima, Haruki Nishimura, Hiromichi Ueno, Satomi Sonoda, Kazuaki Nishimura, Kentaro Tanaka, Reiko Saito, Mitsuhiro Yoshimura, Takashi Maruyama, Takanori Matsuura, Hitoshi Suzuki, Makoto Kawasaki, Hideo Ohnishi, Akinori Sakai, Yoichi Ueta,