Deficiency of ascorbic acid in experimental diabetes. Relationship with collagen and polyol pathway abnormalities.

Abstract:

:The plasma and tissue concentration of ascorbic acid (AA) is reduced in diabetes. This study was designed to investigate the mechanism and significance of this phenomenon. The low plasma AA concentration of diabetic rats can be normalized by dietary AA supplement (20-40 mg/day), a dosage approximately equal to the maximal synthetic rate of this substance in the rats. Treatment of diabetic rats with this regime prevented the decrease in activity of granulation tissue prolyl hydroxylase (PRLase), an AA-dependent enzyme required for maintaining the normal properties of collagen. The decreased plasma AA concentration and granulation tissue PRLase activity in diabetes can also be normalized by the aldose reductase inhibitor tolrestat. We conclude that in diabetic animals there is a true deficiency of AA that may be responsible for some of the changes of collagen observed in diabetes. Treatment with AA or an aldose reductase inhibitor may prevent some of the diabetic complications with underlying collagen abnormalities.

journal_name

Diabetes

journal_title

Diabetes

authors

McLennan S,Yue DK,Fisher E,Capogreco C,Heffernan S,Ross GR,Turtle JR

doi

10.2337/diab.37.3.359

subject

Has Abstract

pub_date

1988-03-01 00:00:00

pages

359-61

issue

3

eissn

0012-1797

issn

1939-327X

journal_volume

37

pub_type

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