Intra-axonal recording from large sensory myelinated axons: demonstration of impaired membrane conductances in early experimental diabetes.

Abstract:

AIM/HYPOTHESIS:Diabetic neuropathy is accompanied by a range of positive (paresthaesia, dysesthaesia, pain) and negative (hypesthaesia, anesthaesia) neurological symptoms suggesting widespread alterations in axonal excitability. The nature and the mechanisms underlying these alterations in axonal excitability are not well understood. The aim of this study was to examine the extent of changes in membrane properties of an identified neuronal structure-the large myelinated sensory axons in early experimental diabetes in rats. METHODS:Intra-axonal microelectrode recordings from large sensory myelinated axons from the isolated sural nerve in short-term streptozotocin-induced diabetic rats were used to study membrane properties using standard current-clamp technique. RESULTS:In addition to decreased conduction velocity we found several differences in physiological properties of sensory axons from diabetic rats: decreased resting membrane potential, decreased single action potential amplitude associated with slower rate of rise and decrease in inward rectification associated with slight alteration in outwardly rectifying conductances indicating impaired potassium conductances. CONCLUSION/INTERPRETATION:These results extend previous indirect evidence that potassium and sodium ionic conductances, most notably the inward rectifier (IR, I(h)), are altered in large sensory axons of diabetic rats. The depression of IR could underly clinical neurological findings in diabetic patients.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Kriz J,Padjen AL

doi

10.1007/s00125-002-1026-z

subject

Has Abstract

pub_date

2003-02-01 00:00:00

pages

213-21

issue

2

eissn

0012-186X

issn

1432-0428

journal_volume

46

pub_type

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