Neuropeptide S-initiated Sequential Cascade Mediated by OX, NK, MGlu and CB Receptors: a Pivotal Role in Stress-induced Analgesia

Overview

Journal J Biomed Sci

Publisher Biomed Central

Specialty Biology

Date 2020 Jan 10

PMID 31915019

Citations 8

Authors

MIng Tatt Lee

Yu-Ting Chiu

Yu-Chun Chiu

Chia Chun Hor

Hsin-Jung Lee

Remo Guerrini

Girolamo Calo

Lih-Chu Chiou

Affiliations

Soon will be listed here.

Abstract

Background: Stress-induced analgesia (SIA) is an evolutionarily conserved phenomenon during stress. Neuropeptide S (NPS), orexins, substance P, glutamate and endocannabinoids are known to be involved in stress and/or SIA, however their causal links remain unclear. Here, we reveal an unprecedented sequential cascade involving these mediators in the lateral hypothalamus (LH) and ventrolateral periaqueductal gray (vlPAG) using a restraint stress-induced SIA model.

Methods: Male C57BL/6 mice of 8-12 week-old were subjected to intra-cerebroventricular (i.c.v.) and/or intra-vlPAG (i.pag.) microinjection of NPS, orexin-A or substance P alone or in combination with selective antagonists of NPS receptors (NPSRs), OX receptors (OXRs), NK receptors (NKRs), mGlu receptors (mGluRs) and CB receptors (CBRs), respectively. Antinociceptive effects of these mediators were evaluated via the hot-plate test. SIA in mice was induced by a 30-min restraint stress. NPS levels in the LH and substance P levels in vlPAG homogenates were compared in restrained and unrestrained mice.

Results: NPS (i.c.v., but not i.pag.) induced antinociception. This effect was prevented by i.c.v. blockade of NPSRs. Substance P (i.pag.) and orexin-A (i.pag.) also induced antinociception. Substance P (i.pag.)-induced antinociception was prevented by i.pag. Blockade of NKRs, mGluRs or CBRs. Orexin-A (i.pag.)-induced antinociception has been shown previously to be prevented by i.pag. blockade of OXRs or CBRs, and here was prevented by NKR or mGluR antagonist (i.pag.). NPS (i.c.v.)-induced antinociception was prevented by i.pag. blockade of OXRs, NKRs, mGluRs or CBRs. SIA has been previously shown to be prevented by i.pag. blockade of OXRs or CBRs. Here, we found that SIA was also prevented by i.c.v. blockade of NPSRs or i.pag. blockade of NKRs or mGluRs. Restrained mice had higher levels of NPS in the LH and substance P in the vlPAG than unrestrained mice.

Conclusions: These results suggest that, during stress, NPS is released and activates LH orexin neurons via NPSRs, releasing orexins in the vlPAG. Orexins then activate OXRs on substance P-containing neurons in the vlPAG to release substance P that subsequently. Activates NKRs on glutamatergic neurons to release glutamate. Glutamate then activates perisynaptic mGluRs to initiate the endocannabinoid retrograde inhibition of GABAergic transmission in the vlPAG, leading to analgesia.

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