title: Characterisation of pain responses in the high fat diet/streptozotocin model of diabetes and the analgesic effects of antidiabetic treatments.
abstract: Chronic pain is a common complication of diabetes. The aim of the present study was to characterise pain behaviour in a high fat diet/streptozotocin (HFD/STZ) model of diabetes in the rat, investigate spinal mechanisms, and determine the effects of antidiabetic interventions. Three-week consumption of a high fat diet followed by single injection of STZ (45 mgkg(-1)) produced sustained changes in plasma insulin and glucose until day 120. Hindpaw mechanical withdrawal thresholds were significantly lowered in the model, but mechanically evoked responses of spinal neurones were unaltered, compared to HFD/vehicle rats. HFD/STZ rats had significantly lower numbers of spinal Iba-1 positive cells (morphologically identified as activated microglia) and spinal GFAP immunofluorescence (a marker of astrogliosis) in the spinal cord at day 50, compared to time-matched controls. The PPARγ ligand pioglitazone (10 mgkg(-1)) did not alter HFD/STZ induced metabolic changes or hindpaw withdrawal thresholds of HFD/STZ rats. Daily linagliptin (3 mgkg(-1)) and metformin (200 mgkg(-1)) from day 4 after model induction did not alter plasma glucose or insulin in HFD/STZ rats but significantly prevented changes in the mechanical withdrawal thresholds. The demonstration that currently prescribed antidiabetic drugs prevent aberrant pain behaviour supports the use of this model to investigate pain mechanisms associated with diabetes.
authors.affiliation: School of Life Sciences, University of Nottingham, Nottingham NG7 2UH, UK.
authors.forename: Frederika Maria
authors.initials: FM
authors.lastname: Byrne
authors.affiliation: RenaSci Ltd., BioCity Nottingham, Pennyfoot Street, Nottingham NG1 1GF, UK.
authors.forename: Sharon
authors.initials: S
authors.lastname: Cheetham
authors.affiliation: RenaSci Ltd., BioCity Nottingham, Pennyfoot Street, Nottingham NG1 1GF, UK.
authors.forename: Steven
authors.initials: S
authors.lastname: Vickers
authors.affiliation: School of Life Sciences, University of Nottingham, Nottingham NG7 2UH, UK ; Arthritis Research UK Pain Centre, University of Nottingham, Nottingham NG7 2UH, UK.
authors.forename: Victoria
authors.initials: V
authors.lastname: Chapman
mesh_terms: D000821:Animal Feed; D000818:Animals; D001522:Behavior, Animal; D001786:Blood Glucose / Q000032:analysis; D003921:Diabetes Mellitus, Experimental / Q000503:physiopathology*; D003929:Diabetic Neuropathies / Q000628:therapy; D059305:Diet, High-Fat; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D007004:Hypoglycemic Agents / Q000737:chemistry; D007328:Insulin / Q000097:blood; D000069476:Linagliptin; D008297:Male; D008687:Metformin / Q000737:chemistry; D008856:Microscopy, Fluorescence; D009457:Neuroglia / Q000378:metabolism; D009474:Neurons / Q000378:metabolism; D047495:PPAR gamma / Q000378:metabolism; D010146:Pain; D059408:Pain Management / Q000379:methods*; D010147:Pain Measurement; D000077205:Pioglitazone; D011687:Purines / Q000737:chemistry; D011799:Quinazolines / Q000737:chemistry; D051381:Rats; D017207:Rats, Sprague-Dawley; D045162:Thiazolidinediones / Q000737:chemistry
chemical_list: D001786:Blood Glucose; D005904:Glial Fibrillary Acidic Protein; D007004:Hypoglycemic Agents; D007328:Insulin; D047495:PPAR gamma; D011687:Purines; D011799:Quinazolines; D045162:Thiazolidinediones; D000069476:Linagliptin; D008687:Metformin; D000077205:Pioglitazone