Retinal capillary basement membrane thickness in diabetic mice genetically modified at the haptoglobin locus.

Abstract:

BACKGROUND:Individuals with diabetes mellitus (DM) homozygous for the haptoglobin (Hp) 1 allele are at decreased risk of retinopathy as compared to DM individuals with the Hp 2 allele. We sought to recapitulate these findings in DM mice genetically modified at the Hp locus. METHODS:An early morphological characteristic of the microangiopathy seen in diabetic retinal disease is retinal capillary basement membrane (RCBM) thickening. RCBM thickness as assessed by electron microscopy was performed on a total of 12 eyes taken from three mice in each of the four study groups (three eyes from C57Bl/6 Hp 1 and C57Bl/6 Hp 2 mice with and without streptozotocin-induced diabetes). RESULTS:The non-parametric Kruskal-Wallis ANOVA test demonstrated that there was a highly significant difference between the four groups of mice (P < 0.0001). Mann-Whitney tests for specific pair-wise comparisons demonstrated that there was no significant difference in the RCBM thickness between Hp 1 and Hp 2 mice (p = 0.70) or between DM Hp 1 and non-DM Hp 1 mice (p = 0.42). However, induction of diabetes resulted in a marked increase in RCBM thickness in Hp 2 mice compared to non-DM Hp 2 mice (p = 0.0004) and compared to DM Hp 1 mice (p = 0.0005). CONCLUSIONS:A highly significant increase in RCBM thickness was observed in DM mice with the Hp 2 genotype. These data provide important support for association studies done in humans showing an increased prevalence of diabetic retinopathy in individuals with the Hp 2 genotype.

journal_name

Diabetes Metab Res Rev

authors

Miller-Lotan R,Miller B,Nakhoul F,Aronson D,Asaf R,Levy AP

doi

10.1002/dmrr.654

subject

Has Abstract

pub_date

2007-02-01 00:00:00

pages

152-6

issue

2

eissn

1520-7552

issn

1520-7560

journal_volume

23

pub_type

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