Changes in diabetic retinal matrix protein mRNA levels in a common transgenic mouse strain.

Abstract:

:Recently, all the structural features of non-proliferative diabetic retinopathy have been demonstrated in mice fed 30% galactose for 21-26 months. To determine whether changes in retinal matrix protein mRNA levels occur early in the course of murine diabetes we used a competitive RT-PCR method to quantitate retinal mRNA levels in an inbred mouse strain (FVB) commonly used for transgenic studies. Retinal mRNA was prepared from STZ-diabetic and non-diabetic FVB mice at 4, 8, 12 and 16 weeks and cDNA encoding basement membrane components was quantitated using MIMIC constructs that compete for the same primer pairs. alpha1 (IV) collagen, the beta1 and gamma1 chains of laminin, fibronectin, and vitronectin mRNAs were quantitated. For alpha1 (IV) collagen, statistically significant diabetes-induced increases were apparent by 8 weeks (3.11 +/- 0.20 vs. 1.29 +/- 0.19 x 10(6) molecules/mg total RNA, p < 0.005). Similarly, diabetes-induced increases were observed by 8 weeks for the beta1 chain of laminin (4.54 +/- 0.22 vs. 1.85 +/- 0.43 x 10(5) molecules/mg total RNA, p < 0.005), the gamma1 chain of laminin (7. 33 +/- 0.29 vs. 4.84 +/- 0.76 x 10(4)/microg total RNA, p < 0.05), and for fibronectin (2.22 +/- 0.21 vs. 1.35 +/- 0.15 x 10(6) molecules/mg total RNA, p < 0.05). The magnitude of change was greatest for alpha1 (IV) collagen (2.4-fold) and beta1 laminin (2. 5-fold) at 8 weeks, and least for fibronectin (1.6-fold). A smaller diabetes-induced increase in vitro nectin mRNA was also observed, but it failed to reach statistical significance at 12 and 16 weeks. These data provide the basis for assessing the effects of genetic manipulation on diabetic retinopathy in transgenic mouse models.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Nishikawa T,Giardino I,Edelstein D,Brownlee M

subject

Has Abstract

pub_date

2000-07-01 00:00:00

pages

581-7

issue

1

eissn

0271-3683

issn

1460-2202

journal_volume

21

pub_type

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