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      Role of orexin receptor subtypes in the inhibitory effects of orexin-A on potassium chloride-induced increases in intracellular calcium ion levels in neurons derived from dorsal root ganglion of carrageenan-treated rats.

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          Abstract

          We analysed the roles of orexin receptors in the effects of orexin-A on KCl-induced increases in intracellular calcium ion levels ([Ca2+]i) in C-fiber-like small neurons of rats with inflammation induced by intraplantar injection of carrageenan into the hind paw. Controls were treated with saline. Paw withdrawal and threshold forces in response to tactile stimuli were determined using von Frey filaments. [Ca2+]i in C-fiber-like neurons derived from dorsal root ganglia was visualised using a calcium fluorescence probe. Changes in neuronal [Ca2+]i were assessed as relative fluorescence intensity (F/F0). One day after carrageenan injection, the paw withdrawal response to tactile stimuli and the paw withdrawal threshold were increased and reduced, respectively. KCl loading of neurons from either carrageenan-treated or control rats increased F/F0 to about 2.0. KCl-induced increases in F/F0 of carrageenan-treated, but not control, rats were inhibited by orexin-A. The OX1 and OX2 receptor antagonist MK-4305, but not the OX1 receptor antagonist SB334867, counteracted the effects of orexin-A on the KCl-induced increase in F/F0. These results suggest that OX2, but not OX1 receptors mediate the inhibitory effect of orexin-A on KCl-induced increases in [Ca2+]i in C-fiber-like neurons of rats with inflammation.

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          Author and article information

          Journal
          J Oral Sci
          Journal of oral science
          Nihon University School of Dentistry
          1880-4926
          1343-4934
          Dec 27 2017
          : 59
          : 4
          Affiliations
          [1 ] Nihon University Graduate School of Dentistry at Matsudo, Anesthesiology.
          [2 ] Department of Pharmacology, Nihon University School of Dentistry at Matsudo.
          Article
          10.2334/josnusd.16-0759
          28993579
          cc89609a-ea06-4703-ad2a-a6f050c64b0b
          History

          carrageenan,rat,dorsal root ganglion,intracellular calcium ion level,orexin-A,orexin receptor

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