Effects of insulin treatment on endoneurial and systemic oxidative stress in relation to nerve conduction in streptozotocin-diabetic rats.

Abstract:

:As increased oxidative stress is probably a pathogenetic factor in the development of diabetic complications, we studied nerve function and endogenous antioxidants in plasma, erythrocytes and sciatic nerve of untreated and insulin-treated streptozotocin-diabetic rats. After 18 weeks, the diabetes-induced sciatic nerve conduction velocity deficits were approximately 65% improved by insulin (P < 0.001). Plasma superoxide dismutase was significantly reduced in diabetes (P < 0.01); smaller decreases in plasma catalase and glutathione levels were observed. These changes were corrected by insulin treatment. In erythrocytes, decreased superoxide dismutase (P < 0.05) and increased total glutathione levels (P < 0.05) were found. All effects of diabetes, including a rise in plasma malonyldialdehyde (P < 0.05), were partially reversed by insulin treatment. In nervous tissue, diabetes caused increased catalase activity, uninfluenced by insulin (P < 0.05). Nerve superoxide dismutase and glutathione did not change. The data suggest that in diabetes, changes in systemic rather than endoneurial oxidative stress lead to nerve dysfunction.

journal_name

Eur J Clin Invest

authors

van Dam PS,Bravenboer B,van Asbeck BS,van Oirschot JF,Marx JJ,Gispen WH

doi

10.1046/j.1365-2362.1996.510601.x

subject

Has Abstract

pub_date

1996-12-01 00:00:00

pages

1143-9

issue

12

eissn

0014-2972

issn

1365-2362

journal_volume

26

pub_type

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