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Diabetes 52:829-837, 2003
© 2003 by the American Diabetes Association, Inc.

Characterization of Retinal Leukostasis and Hemodynamics in Insulin Resistance and Diabetes

Role of Oxidants and Protein Kinase-C Activation

Toru Abiko1, Atsuko Abiko1, Allen C. Clermont2, Brett Shoelson2, Naoichi Horio1, Junichi Takahashi1, Anthony P. Adamis3, George L. King1,4, and Sven-Erik Bursell2,5

1 Research Division, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
2 Beetham Eye Institute, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
3 Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts
4 Department of Medicine, Harvard Medical School, Boston, Massachusetts
5 Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts

Increases in leukostasis/monocyte adhesion to the capillary endothelium (leukostasis) and decreases in retinal blood flow may be causally associated and are implicated in the pathogenesis of diabetic retinopathy. In this study, we demonstrate that increases in leukostasis are observed in insulin-resistant states without diabetes, whereas decreases in retinal blood flow require diabetes and hyperglycemia. Microimpaction studies using beads mimicking retinal capillary obstruction by leukocytes did not affect retinal blood flow. In diabetic rats, treatment with the antioxidant {alpha}-lipoic acid normalized the amount of leukostasis but not retinal blood flow. In contrast, treatment with D-{alpha}-tocopherol and protein kinase-C ß-isoform inhibition (LY333531) prevented the increases in leukostasis and decreases in retinal blood flow in diabetic rats. Serum hydroxyperoxide, a marker of oxidative stress, was increased in diabetic rats, but normalized by treatment with antioxidants {alpha}-lipoic acid and D-{alpha}-tocopherol and, surprisingly, PKC ß-isoform inhibition. These findings suggest that leukostasis is associated with endothelial dysfunction, insulin resistance, and oxidative stress but is not related to retinal blood flow and is not sufficient to cause diabetic-like retinopathy. Moreover, treatment with PKC ß inhibition is effective to normalize diabetes or hyperglycemia-induced PKC ß-isoform activation and oxidative stress.


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