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Diabetes-induced microvascular complications at the level of the spinal cord: a contributing factor in diabetic neuropathic pain

Ved, Nikita; Da Vitoria Lobo, M.E.; Bestall, Samuel M.; Vidueira, C.L.; Beazley-Long, Nicholas; Ballmer-Hofer, Kurt; Hirashima, Masanori; Bates, David O.; Donaldson, Lucy F.; Hulse, Richard P.

Authors

Nikita Ved

M.E. Da Vitoria Lobo

Samuel M. Bestall

C.L. Vidueira

Kurt Ballmer-Hofer

Masanori Hirashima

LUCY DONALDSON Lucy.Donaldson@nottingham.ac.uk
Professor of Sensory Physiology

Richard P. Hulse



Abstract

Abnormalities of neurovascular interactions within the central nervous system of diabetic patients is associated with the onset of many neurological disease states. However, to date, the link between the neurovascular network within the spinal cord and regulation of nociception has not been investigated despite neuropathic pain being common in diabetes. We hypothesised that hyperglycaemia-induced endothelial degeneration in the spinal cord, due to suppression of VEGF-A/VEGFR2 signalling, induces diabetic neuropathic pain. Nociceptive pain behaviour was investigated in a chemically induced model of type 1 diabetes (streptozotocin induced, insulin supplemented; either vehicle or VEGF-A165b treated) and an inducible endothelial knockdown of VEGFR2 (tamoxifen induced). Diabetic animals developed mechanical allodynia and heat hyperalgesia. This was associated with a reduction in the number of blood vessels and reduction in Evans blue extravasation in the lumbar spinal cord of diabetic animals versus age-matched controls. Endothelial markers occludin, CD31 and VE-cadherin were downregulated in the spinal cord of the diabetic group versus controls, as well as a concurrent reduction of VEGF-A165b expression. In diabetic animals, VEGF-A165b treatment (biweekly intraperitoneal, 20ng/g) restored normal Evans blue extravasation and prevented vascular degeneration, diabetes-induced central neuron activation and neuropathic pain. Inducible knockdown of VEGFR2 (tamoxifen treated Tie2CreERT2-vegfr2flfl mice) led to a reduction in blood vessel network volume in the lumbar spinal cord and development of heat hyperalgesia. These findings indicate that hyperglycaemia leads to a reduction in the VEGF-A/VEGFR2 signalling cascade resulting in endothelial dysfunction in the spinal cord, which could be an undiscovered contributing factor to diabetic neuropathic pain.

Journal Article Type Article
Publication Date Aug 15, 2018
Journal Journal of Physiology
Print ISSN 0022-3751
Electronic ISSN 1469-7793
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 596
Issue 16
Pages 3675-3693
APA6 Citation Ved, N., Da Vitoria Lobo, M., Bestall, S. M., Vidueira, C., Beazley-Long, N., Ballmer-Hofer, K., …Hulse, R. P. (2018). Diabetes-induced microvascular complications at the level of the spinal cord: a contributing factor in diabetic neuropathic pain. Journal of Physiology, 596(16), 3675-3693. https://doi.org/10.1113/JP275067
DOI https://doi.org/10.1113/JP275067
Keywords Pain; Diabetes; Endothelial
Publisher URL https://physoc.onlinelibrary.wiley.com/doi/abs/10.1113/JP275067
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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