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Abstract

Experimental diabetic neuropathy. Inhibition of protein mono-ADP-ribosylation prevents reduction of substance P axonal transport.

M L Donadoni, R Gavezzotti, F Borella, A M Di Giulio and A Gorio
Journal of Pharmacology and Experimental Therapeutics July 1995, 274 (1) 570-576;
M L Donadoni
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R Gavezzotti
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F Borella
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A M Di Giulio
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A Gorio
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Abstract

The extranuclear endogenous mono-ADP-ribosylation of proteins in cellular fractions from retinas of control and diabetic rats was studied. At least six proteins were ADP-ribosylated in the crude extract, membrane and cytosolic fractions from control preparations, whereas in diabetic rats the number of labeled proteins and the extent of labeling were highly reduced. Treatment of diabetic animals with silybin, a flavonoid with ADP-ribosyltransferase inhibitory activity, did not affect hyperglycemia, but prevented the alterations of the extent of ADP-ribosylation of the 38 K cytosolic, 39 K, 40 K membrane and 39 K, 41 K and 42 K crude extract proteins. These data suggest a hyperactivity of extranuclear endogenous protein mono-ADP-ribosylation in the diabetic rat retina, and that treatment with silybin inhibits such enzyme activity, thus improving the extent of ADP-ribosylation. Sciatic nerve axonal transport of substance P was reduced markedly in diabetic rats, and inhibition of mono-ADP-ribosylation with silybin prevented such a loss in spite of high blood glucose levels. These results suggest that the abnormal endogenous ADP-ribosylation of proteins might play a role in the onset of diabetic peripheral neuropathy and its inhibition may represent a novel pharmacological approach to the treatment of diabetes complications.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 274, Issue 1
1 Jul 1995
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Abstract

Experimental diabetic neuropathy. Inhibition of protein mono-ADP-ribosylation prevents reduction of substance P axonal transport.

M L Donadoni, R Gavezzotti, F Borella, A M Di Giulio and A Gorio
Journal of Pharmacology and Experimental Therapeutics July 1, 1995, 274 (1) 570-576;

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Abstract

Experimental diabetic neuropathy. Inhibition of protein mono-ADP-ribosylation prevents reduction of substance P axonal transport.

M L Donadoni, R Gavezzotti, F Borella, A M Di Giulio and A Gorio
Journal of Pharmacology and Experimental Therapeutics July 1, 1995, 274 (1) 570-576;
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