Volume 20, Issue 5 pp. 577-584
Main Article

Nonenzymatic glycation of peripheral and central nervous system proteins in experimental diabetes mellitus

Catherine Ryle PhD

Catherine Ryle PhD

Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom

Department of Clinical Neurology, Radcliffe Infirmary, Oxford OX2 6HE, United Kingdom

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C.K. Leow FRCS

C.K. Leow FRCS

Nuffield Department of Surgery, John Radcliffe Hospital, Oxford OX3 9DU, United Kingdom

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Michael Donaghy FRCP

Corresponding Author

Michael Donaghy FRCP

Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom

Department of Clinical Neurology, Radcliffe Infirmary, Oxford OX2 6HE, United Kingdom

Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom; Department of Clinical Neurology, Radcliffe Infirmary, Oxford OX2 6HE, United KingdomSearch for more papers by this author

Abstract

Nonenzymatic glycation of neural proteins could underlie diabetic peripheral neuropathy. Cytoskeletal and myelin protein fractions of central nervous system and peripheral nervous system (PNS) tissue from rats with streptozotocin-induced diabetes of 1.5 and 8 months duration were analyzed for glycation products. In sciatic nerve cytoskeletal preparations from both diabetic and control animals we found high levels of the early glycation product (measured as furosine) after 6 weeks, which had fallen markedly by 8 months. Conversely the advanced glycation end product (AGE), pentosidine, was low at 6 weeks and high by 8 months in diabetic animals. The levels of glycation products were much lower in spinal cord and spinal nerve from diabetic animals. There was increased borotritride labeling of neurofilament subunits, and of cross-linked material, in cytoskeletal fractions of diabetic sciatic nerves. These results show that the PNS cytoskeleton is vulnerable to nonenzymatic glycation, resulting in AGE formation, in diabetic rats and to a lesser extent in normals. © 1997 John Wiley & Sons, Inc. Muscle Nerve, 20, 577–584, 1997.

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