Suppression of neuropathic pain in the circadian clock–deficient Per2m/m mice involves up-regulation of endocannabinoid system

Author:

Yamakawa Wakaba1ORCID,Yasukochi Sai1,Tsurudome Yuya2ORCID,Kusunose Naoki1,Yamaguchi Yuta1,Tsuruta Akito13ORCID,Matsunaga Naoya4,Ushijima Kentaro2ORCID,Koyanagi Satoru13ORCID,Ohdo Shigehiro1

Affiliation:

1. Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Kyushu University , Fukuoka, 812-8582 , Japan

2. Division of Pharmaceutics, Faculty of Pharmaceutical Sciences, Sanyo-Onoda City University , Yamaguchi, 756-0884 , Japan

3. Department of Glocal Healthcare Science, Faculty of Pharmaceutical Sciences, Kyushu University , Fukuoka, 812-8582 , Japan

4. Department of Clinical Pharmacokinetics, Faculty of Pharmaceutical Sciences, Kyushu University , Fukuoka, 812-8582 , Japan

Abstract

Abstract Neuropathic pain often results from injuries and diseases that affect the somatosensory system. Disruption of the circadian clock has been implicated in the exacerbation of the neuropathic pain state. However, in this study, we report that mice deficient in a core clock component Period2 (Per2m/m mice) fail to develop tactile pain hypersensitivity even following peripheral nerve injury. Similar to male wild-type mice, partial sciatic nerve ligation (PSL)-Per2m/m male mice showed activation of glial cells in the dorsal horn of the spinal cord and increased expression of pain-related genes. Interestingly, α1D-adrenergic receptor (α1D-AR) expression was up-regulated in the spinal cord of Per2m/m mice, leading to increased production of 2-arachidonoylglycerol (2-AG), an endocannabinoid receptor ligand. This increase in 2-AG suppressed the PSL-induced tactile pain hypersensitivity. Furthermore, intraspinal dorsal horn injection of adeno-associated viral vectors expressing α1D-AR also attenuated pain hypersensitivity in PSL-wild-type male mice by increasing 2-AG production. Our findings reveal an uncovered role of the circadian clock in neuropathic pain disorders and suggest a link between α1D-AR signaling and the endocannabinoid system.

Funder

Japan Society for the Promotion of Science

Japan Agency for Medical Research and Development

Japan Science and Technology Agency

Publisher

Oxford University Press (OUP)

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