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(Investigative Ophthalmology and Visual Science. 2004;45:441-447.)
© 2004 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.03-0869
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Mouse Strain–Dependent Heterogeneity of Resting Limbal Vasculature

Candy K. Chan,1,2 Lucia N. Pham,2 Cynthia Chinn,2 Christine Spee,3 Stephen J. Ryan,2,3 Rosemary J. Akhurst,4 and David R. Hinton1,2,3

1From the Departments of Pathology, and 3Ophthalmology and 2The Arnold and Mabel Beckman Macular Research Center at the Doheny Eye Institute, Keck School of Medicine, University of Southern California, Los Angeles, California; and the 4Mt. Zion Cancer Research Institute, University of California San Francisco, San Francisco, California.

PURPOSE. Heterogeneity of the extent of angiogenesis induced by exogenous growth factors may be determined by genetic influences. Because angiogenesis is the formation of new vessels from preexisting ones, strain-related influences on naïve resting limbal vessel phenotype and gene expression were determined in mice having divergently low and high angiogenic responses.

METHODS. Resting limbal vessel surface area and density and extent of bFGF-induced corneal angiogenesis were determined in C57BL/6J, BALB/cJ, F1 intercross {equiv} C57BL/6J X 129S3/SvIM, and 129S3/SvIM mouse strains by quantitative three-dimensional reconstruction confocal microscopy. Strain-related influences on pro- and antiangiogenic gene expression in naïve cornea were determined by quantitative real-time RT-PCR.

RESULTS. The strain-dependent rank order of resting limbal vessel surface area and resting vessel density paralleled bFGF-induced neovascularization: 129S3/SvIM > BALB/cJ, F1 > C57BL/6J (P < 0.0006). Pigment epithelium–derived factor (PEDF) was increased more than 67-fold compared to Ang-2 in resting cornea of both C57BL/6J and 129S3/SvIM strains (P < 0.0001; P < 0.0001), suggesting a strongly antiangiogenic environment. The corneas of the C57BL/6J mice demonstrated 1.8-, 1.5-, and 1.7-fold increased mRNA levels for Flt-1, VEGF, and bFGF, respectively (P < 0.02; P < 0.04; P < 0.02); however, TSP-1 expression was increased 2.4-fold compared with 129S3/SvIM (P < 0.0004).

CONCLUSIONS. Strain-dependent differences in the resting limbal vessel surface area and density correlated with heterogeneity in the extent of bFGF-induced angiogenesis. Differences in pro- and antiangiogenic gene expression levels in resting cornea may influence vascular limbal phenotype during quiescence and may predict susceptibility to angiogenesis-dependent diseases.




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