A nonautonomous role for retinal frizzled-5 in regulating hyaloid vitreous vasculature development.

Zhang J, Fuhrmann S, Vetter ML
Invest Ophthalmol Vis Sci. 2008 49 (12): 5561-7

PMID: 18791178 · PMCID: PMC2679971 · DOI:10.1167/iovs.08-2226

PURPOSE - Frizzled-5 (Fzd5) is expressed in the developing retina of multiple species and appears to play species-specific roles during eye development. The present study analyzed the effects of tissue-specific deletion of Fzd5 on mammalian eye development.

METHODS - To generate Fzd5 conditional knockout (CKO) mice, Fzd5(+/-) mice carrying the Six3-Cre transgene were crossed with Fzd5(LoxP/LoxP) mice. To determine which cell lineages in the eye had Cre recombinase activity, Six3-Cre transgenic mice were crossed with ROSA-26 reporter mice, and lacZ activity was assayed. Histologic analysis, immunofluorescence, and TUNEL labeling were performed from embryonic day (E)12.5 to postnatal stages to analyze vascularization, cell proliferation, retinal organization, and apoptosis.

RESULTS - On conditional disruption of Fzd5 specifically in the retina, but not in vitreous hyaloid vasculature (VHV), an abnormal accumulation consisting of pericytes and endothelial cells was observed in the vitreous as early as E12.5. The abundant retrolental cells persisted into postnatal stages and appeared as a pigmented intravitreal mass. In Fzd5 CKO mice there was failure of normal apoptosis of the VHV, and cells in the persistent VHV were maintained in the cell cycle up to postnatal day 23. Moreover, morphogenesis of the retina adjacent to the vasculature was disrupted, leading to retinal folds, detachment, and abnormal lamination. This phenotype is similar to that of human eye disease persistent hyperplastic primary vitreous (PHPV).

CONCLUSIONS - Selective loss of Fzd5 in the retina results in PHPV and retinal defects through an apparently cell-nonautonomous effect, revealing a potential requirement for retina-derived signals in regulating the development of the VHV.

MeSH Terms (23)

Animals Apoptosis Cell Proliferation Female Fluorescent Antibody Technique, Indirect Frizzled Receptors Gene Expression Regulation, Developmental Gene Silencing Genotype In Situ Hybridization In Situ Nick-End Labeling Integrases Male Mice Mice, Knockout Mice, Transgenic Persistent Hyperplastic Primary Vitreous Polymerase Chain Reaction Receptors, G-Protein-Coupled Retina Retinal Dysplasia Retinal Ganglion Cells Vitreous Body

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