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Diabetes, Vol 36, Issue 5 597-601, Copyright © 1987 by American Diabetes Association

ARTICLES

Quantitative changes of cerebral neocortical structure in insulin-treated long-term streptozocin-induced diabetes in rats

J Jakobsen, P Sidenius, HJ Gundersen and R Osterby

The brains of rats with streptozocin-induced diabetes treated with a low-dose insulin regimen (1 IU/day) were studied with morphometric techniques. After 1 yr of diabetes, brain weight decreased slightly (1350 +/- 71 vs. 1521 +/- 55 mg, 2P less than .01) as did the volume of the neocortex (498 +/- 36 vs. 567 +/- 40 mm3, 2P less than .05). A significant loss of neocortical neurons occurred (38 +/- 2 X 10(6) vs. 46 +/- 3 X 10(6), 2P less than .01), and the length of the capillary network in the neocortical tissue shortened disproportionately (405 +/- 102 vs. 631 +/- 47 m, 2P less than .01), leading to increased diffusion distance. The mechanisms underlying cerebral loss in this model are unknown, but abnormalities of the vascular supply with prolongation of the route of diffusion might play a role.
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Copyright © 1987 by the American Diabetes Association.