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Enhanced antinociception by intracerebroventricularly administered orexin A in histamine H1 or H2 receptor gene knockout mice.
Pain. 2005 Nov; 118(1-2):254-62.PAIN

Abstract

Orexins are neuropeptides that are mostly expressed in the posterior and lateral hypothalamus, and related to the central control of appetite, arousal, and antinociception. Orexin neurons projected to the tuberomammillary nucleus and orexins may release histamine from the histamine neurons in this nucleus. Histamine is known to cause hypernociception. The roles of histamine H1 and H2 receptors in the orexin A-induced antinociception, however, have not been clarified yet. Here we studied the effects of histamine H1 and H2 receptors on orexin A-produced antinociception using histamine receptor knockout mice in four assays of nociception; the hot-plate, the tail-flick, the tail-pressure and the capsaicin tests. Furthermore we studied effects of histamine H1 and H2 receptor antagonists on orexin A-produced antinociception in C57BL/6 mice. The antinociceptive effects of i.c.v. orexin A were greater in histamine H1 receptor or H2 receptor knockout mice than in the wild-type mice in all four assays of pain. Furthermore, treatment of C57BL/6 mice with a combination of i.c.v. orexin A and d-chlorpheniramine (a histamine H1 receptor antagonist) or cimetidine (a histamine H2 receptor antagonist) showed a greater antinociception than i.c.v. orexin A alone in all four assays. These findings suggest the possibility that orexin A may activate H1 and H2 receptors in the supraspinal levels through the release of histamine from neurons, which might attenuate the antinociceptive effects of orexin A. Thus, the blocking of the histamine H1 or H2 receptor may produce antinociception and enhance the orexin A-induced antinociception.

Authors+Show Affiliations

Department of Pharmacology, Tohoku University School of Medicine, Seiryo-machi 2-1, Sendai 980-8575, Japan. jalalizadi2002@yahoo.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16202530

Citation

Mobarakeh, Jalal Izadi, et al. "Enhanced Antinociception By Intracerebroventricularly Administered Orexin a in Histamine H1 or H2 Receptor Gene Knockout Mice." Pain, vol. 118, no. 1-2, 2005, pp. 254-62.
Mobarakeh JI, Takahashi K, Sakurada S, et al. Enhanced antinociception by intracerebroventricularly administered orexin A in histamine H1 or H2 receptor gene knockout mice. Pain. 2005;118(1-2):254-62.
Mobarakeh, J. I., Takahashi, K., Sakurada, S., Nishino, S., Watanabe, H., Kato, M., Naghdi, N., & Yanai, K. (2005). Enhanced antinociception by intracerebroventricularly administered orexin A in histamine H1 or H2 receptor gene knockout mice. Pain, 118(1-2), 254-62.
Mobarakeh JI, et al. Enhanced Antinociception By Intracerebroventricularly Administered Orexin a in Histamine H1 or H2 Receptor Gene Knockout Mice. Pain. 2005;118(1-2):254-62. PubMed PMID: 16202530.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Enhanced antinociception by intracerebroventricularly administered orexin A in histamine H1 or H2 receptor gene knockout mice. AU - Mobarakeh,Jalal Izadi, AU - Takahashi,Kazuhiro, AU - Sakurada,Shinobu, AU - Nishino,Seiji, AU - Watanabe,Hiroyuki, AU - Kato,Motohisa, AU - Naghdi,Nasser, AU - Yanai,Kazuhiko, Y1 - 2005/10/03/ PY - 2005/03/17/received PY - 2005/07/22/revised PY - 2005/08/18/accepted PY - 2005/10/6/pubmed PY - 2006/7/11/medline PY - 2005/10/6/entrez SP - 254 EP - 62 JF - Pain JO - Pain VL - 118 IS - 1-2 N2 - Orexins are neuropeptides that are mostly expressed in the posterior and lateral hypothalamus, and related to the central control of appetite, arousal, and antinociception. Orexin neurons projected to the tuberomammillary nucleus and orexins may release histamine from the histamine neurons in this nucleus. Histamine is known to cause hypernociception. The roles of histamine H1 and H2 receptors in the orexin A-induced antinociception, however, have not been clarified yet. Here we studied the effects of histamine H1 and H2 receptors on orexin A-produced antinociception using histamine receptor knockout mice in four assays of nociception; the hot-plate, the tail-flick, the tail-pressure and the capsaicin tests. Furthermore we studied effects of histamine H1 and H2 receptor antagonists on orexin A-produced antinociception in C57BL/6 mice. The antinociceptive effects of i.c.v. orexin A were greater in histamine H1 receptor or H2 receptor knockout mice than in the wild-type mice in all four assays of pain. Furthermore, treatment of C57BL/6 mice with a combination of i.c.v. orexin A and d-chlorpheniramine (a histamine H1 receptor antagonist) or cimetidine (a histamine H2 receptor antagonist) showed a greater antinociception than i.c.v. orexin A alone in all four assays. These findings suggest the possibility that orexin A may activate H1 and H2 receptors in the supraspinal levels through the release of histamine from neurons, which might attenuate the antinociceptive effects of orexin A. Thus, the blocking of the histamine H1 or H2 receptor may produce antinociception and enhance the orexin A-induced antinociception. SN - 0304-3959 UR - https://www.unboundmedicine.com/medline/citation/16202530/Enhanced_antinociception_by_intracerebroventricularly_administered_orexin_A_in_histamine_H1_or_H2_receptor_gene_knockout_mice_ DB - PRIME DP - Unbound Medicine ER -