Downregulation of GABAB receptors in the spinal cord dorsal horn in diabetic neuropathy

Diabetic neuropathic pain is a common clinical problem and remains difficult to treat with classic analgesics. Spinal dorsal horn neurons are important in mediating nociceptive signaling, and the hyperactivity of these neurons is critical in diabetic neuropathy. In this study, we determined the GABA...

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Veröffentlicht in:Neuroscience letters 2011-02, Vol.490 (2), p.112-115
Hauptverfasser: WANG, Xiu-Li, QI ZHANG, ZHANG, Ying-Ze, LIU, Yan-Tao, RUI DONG, QIU JUN WANG, GUO, Yue-Xian
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container_end_page 115
container_issue 2
container_start_page 112
container_title Neuroscience letters
container_volume 490
creator WANG, Xiu-Li
QI ZHANG
ZHANG, Ying-Ze
LIU, Yan-Tao
RUI DONG
QIU JUN WANG
GUO, Yue-Xian
description Diabetic neuropathic pain is a common clinical problem and remains difficult to treat with classic analgesics. Spinal dorsal horn neurons are important in mediating nociceptive signaling, and the hyperactivity of these neurons is critical in diabetic neuropathy. In this study, we determined the GABA(B) receptor expression level in dorsal horn neurons in streptozotocin (STZ)-induced diabetes in rats by using reverse-transcription polymerase chain reaction (RT-PCR) and western blot analyses. Mean blood glucose concentrations were significantly higher and the paw withdrawal threshold was significantly lower in STZ-treated rats than in saline-treated rats. Immunohistochemical staining showed that the GABA(B) receptor was extensively expressed in the spinal dorsal horn neurons. The GABA(B1) mRNA level decreased in a time-dependent manner in STZ-treated rats compared with saline-treated controls. Furthermore, the protein expression level revealed by western blot analysis was lower in STZ-treated rats than in saline-treated rats. These data suggest that GABA(B) receptors are downregulated in the spinal dorsal horn in this model of STZ-induced diabetic neuropathic pain. The reduction of GABA(B) expression may contribute to the hyperactivity of spinal dorsal horn neurons and diabetic neuropathic pain.
doi_str_mv 10.1016/j.neulet.2010.12.038
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Spinal dorsal horn neurons are important in mediating nociceptive signaling, and the hyperactivity of these neurons is critical in diabetic neuropathy. In this study, we determined the GABA(B) receptor expression level in dorsal horn neurons in streptozotocin (STZ)-induced diabetes in rats by using reverse-transcription polymerase chain reaction (RT-PCR) and western blot analyses. Mean blood glucose concentrations were significantly higher and the paw withdrawal threshold was significantly lower in STZ-treated rats than in saline-treated rats. Immunohistochemical staining showed that the GABA(B) receptor was extensively expressed in the spinal dorsal horn neurons. The GABA(B1) mRNA level decreased in a time-dependent manner in STZ-treated rats compared with saline-treated controls. Furthermore, the protein expression level revealed by western blot analysis was lower in STZ-treated rats than in saline-treated rats. 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Target tissue resistance ; Fundamental and applied biological sciences. Psychology ; Male ; Medical sciences ; Pain Measurement - methods ; Posterior Horn Cells - metabolism ; Posterior Horn Cells - pathology ; Rats ; Rats, Sprague-Dawley ; Receptors, GABA-B - biosynthesis ; Receptors, GABA-B - metabolism ; RNA, Messenger - biosynthesis ; Spinal Cord - metabolism ; Spinal Cord - pathology ; Vertebrates: nervous system and sense organs</subject><ispartof>Neuroscience letters, 2011-02, Vol.490 (2), p.112-115</ispartof><rights>2015 INIST-CNRS</rights><rights>Crown Copyright © 2010. Published by Elsevier Ireland Ltd. 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Impaired glucose tolerance</topic><topic>Diabetic Neuropathies - metabolism</topic><topic>Diabetic Neuropathies - pathology</topic><topic>Down-Regulation - physiology</topic><topic>Endocrine pancreas. Apud cells (diseases)</topic><topic>Endocrinopathies</topic><topic>Etiopathogenesis. Screening. Investigations. Target tissue resistance</topic><topic>Fundamental and applied biological sciences. 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subjects Animals
Biological and medical sciences
Diabetes Mellitus, Experimental - metabolism
Diabetes Mellitus, Experimental - pathology
Diabetes. Impaired glucose tolerance
Diabetic Neuropathies - metabolism
Diabetic Neuropathies - pathology
Down-Regulation - physiology
Endocrine pancreas. Apud cells (diseases)
Endocrinopathies
Etiopathogenesis. Screening. Investigations. Target tissue resistance
Fundamental and applied biological sciences. Psychology
Male
Medical sciences
Pain Measurement - methods
Posterior Horn Cells - metabolism
Posterior Horn Cells - pathology
Rats
Rats, Sprague-Dawley
Receptors, GABA-B - biosynthesis
Receptors, GABA-B - metabolism
RNA, Messenger - biosynthesis
Spinal Cord - metabolism
Spinal Cord - pathology
Vertebrates: nervous system and sense organs
title Downregulation of GABAB receptors in the spinal cord dorsal horn in diabetic neuropathy
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