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Neutrophils Infiltrate the Spinal Cord Parenchyma of Rats with Experimental Diabetic Neuropathy
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Journal Article
Neutrophils Infiltrate the Spinal Cord Parenchyma of Rats with Experimental Diabetic Neuropathy
2017
Overview
Spinal glial cell activation and cytokine secretion have been implicated in the etiology of neuropathic pain in a number of experimental models, including diabetic neuropathy. In this study, streptozotocin- (STZ-) induced diabetic rats were either untreated or treated with gabapentin (50 mg/kg/day by gavage for 2 weeks, from 6 weeks after STZ). At 8 weeks after STZ, hypersensitivity was confirmed in the untreated diabetic rats as a reduced response threshold to touch, whilst mechanical thresholds in gabapentin-treated diabetic rats were no different from controls. Diabetes-associated thermal hypersensitivity was also ameliorated by gabapentin. We performed a cytokine profiling array in lumbar spinal cord samples from control and diabetic rats. This revealed an increase in L-selectin, an adhesion molecule important for neutrophil transmigration, in the spinal cord of diabetic rats but not diabetic rats treated with gabapentin. Furthermore, we found an increase in the number of neutrophils present in the parenchyma of the spinal cord, which was again ameliorated in gabapentin-treated diabetic rats. Therefore, we suggest that dysregulated spinal L-selectin and neutrophil infiltration into the spinal cord could contribute to the pathogenesis of painful diabetic neuropathy.
Publisher
Hindawi Publishing Corporation,Hindawi,John Wiley & Sons, Inc,Wiley
Subject
/ Analgesics - therapeutic use
/ Animals
/ Cyclohexanecarboxylic Acids - pharmacology
/ Cyclohexanecarboxylic Acids - therapeutic use
/ Diabetes
/ Diabetes Mellitus, Experimental - immunology
/ Diabetes Mellitus, Experimental - pathology
/ Diabetic Neuropathies - drug therapy
/ Diabetic Neuropathies - immunology
/ Diabetic Neuropathies - pathology
/ gamma-Aminobutyric Acid - pharmacology
/ gamma-Aminobutyric Acid - therapeutic use
/ Male
/ Neutrophil Infiltration - drug effects
/ Neutrophil Infiltration - physiology
/ Pain
/ Pain Threshold - drug effects
/ Rats
