Role of spinal GABA receptors in the acute antinociceptive response of mice to hyperbaric oxygen

Abigail L Brewer; Shulin Liu; Amber V Buhler; Donald Y Shirachi; Raymond M Quock

doi:10.1016/j.brainres.2018.08.002

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Role of spinal GABA receptors in the acute antinociceptive response of mice to hyperbaric oxygen

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Role of spinal GABA receptors in the acute antinociceptive response of mice to hyperbaric oxygen

Abigail L Brewer, Shulin Liu, Amber V Buhler, Donald Y Shirachi and Raymond M Quock

Brain research, Vol.1699, pp.107-116

11/15/2018

DOI: https://doi.org/10.1016/j.brainres.2018.08.002

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https://hdl.handle.net/2376/112135

PMCID: PMC6195826

PMID: 30077648

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Abstract

Nitric oxide synthase

Antinociception

Spinal cord

GABA receptors

Hyperbaric oxygen

•HBO2-induced antinociception is mediated by spinal GABAA but not GABAB receptors.•Acetic acid reduced expression of nNOS and GABAA β3pSER 408/409.•HBO2 treatment restored nNOS and GABAA β3pSER 408/409 expression to control levels.•Protein expression was altered in lumbar but not thoracic spinal cord. New pain treatments are in demand due to the pervasive nature of pain conditions. Hyperbaric oxygen (HBO2) has shown potential in treating pain in both clinical and preclinical settings, although the mechanism of this effect is still unknown. The aim of this study was to investigate whether the major inhibitory neurotransmitter γ-aminobutyric acid (GABA) is involved in HBO2-induced antinociception in the central nervous system (CNS). To accomplish this goal, pharmacological interactions between GABA drugs and HBO2 were investigated using the behavioral acetic acid abdominal constriction test. Western blotting was used to quantify protein changes that might occur as a result of the interactions. GABAA but not GABAB receptor antagonists dose-dependently reduced HBO2 antinociception, while antagonism of the GABA reuptake transporter enhanced this effect. Western blot results showed an interaction between the pain stimulus and HBO2 on expression of the phosphorylated β3 subunit of the GABAA receptor at S408/409 in homogenates of the lumbar but not thoracic spinal cord. A significant interaction was also found in neuronal nitric oxide synthase (nNOS) expression in the lumbar but not thoracic spinal cord. These findings support the notion that GABA may be involved in HBO2-induced antinociception at the GABAA receptor but indicate that more study will be needed to understand the intricacies of this interaction.

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Title: Role of spinal GABA receptors in the acute antinociceptive response of mice to hyperbaric oxygen
Creators: Abigail L Brewer - Department of Psychology, Washington State University, Pullman, WA 99164, USA
Shulin Liu - Department of Aviation Medicine, Naval Medicine Research Institute, Second Military Medical University, Shanghai 200433, China
Amber V Buhler - School of Pharmacy, Pacific University Oregon, Hillsboro, OR 97123, USA
Donald Y Shirachi - Department of Physiology and Pharmacology, Thomas J. Long School of Pharmacy and Health Sciences, University of the Pacific, Stockton, CA 95211, USA
Raymond M Quock - Department of Psychology, Washington State University, Pullman, WA 99164, USA
Publication Details: Brain research, Vol.1699, pp.107-116
Academic Unit: Psychology, Department of
Publisher: Elsevier B.V
Identifiers: 99900547510201842
Language: English
Resource Type: Journal article