Abstract.
We have previously shown that immunoneutralization of transforming growth factor-β (TGF-β) in the chick embryo significantly reduces programmed cell death (PCD) in peripheral neurons, spinal cord, and retina. In order to validate these results we have begun to analyze PCD in mice with targeted ablations of the TGF-β2 and TGF-β3 genes. Recent analyses of mice lacking TGF-β3 had failed to reveal an overt eye phenotype, while retinae of TGF-β2-deficient mice showed retinal hypercellularity. We report now that eyes of Tgfβ2/Tgfβ3 double-deficient mice display severe alterations in the morphology of the retina, lens, and cornea. The inner neural retina—the region where TGF-β receptor (TβR) I and II immunoreactivities are most prominent—is significantly thickened, and numbers of TUNEL-positive cells are significantly reduced compared to wild-type littermates. In Tgfβ2 −/− Tgfβ3 −/− and Tgfβ2 −/− Tgfβ3 +/− littermates the retina was consistently detached from the underlying pigment epithelium. Cornea, corneal stroma, and lens epithelium were significantly thinner in these mutants. In contrast, retinal morphology in Tgfβ2 +/− Tgfβ3 −/−mutant littermates resembles the situation observed in wild-type retinae except for the retinal detachment. Thus, regression in the thickness of cornea and corneal stroma seems to be TGF-β isoform and gene dose dependent. Our results substantiate the notion based on previous analyses of chick embryos with reduced levels of endogenous TGF-β that TGF-β, most notably TGF-β2, is required to mediate PCD in developing retinal cells in vivo. Moreover, our data indicate that TGF-βs play essential roles in cornea and lens development.
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Acknowledgements.
The authors are grateful to T. Doetschman (University of Cincinnati, Cincinnati, OH) for generously providing Tgfβ2 +/− and Tgfβ3 +/− breeding pairs. The authors also thank Ms. H. Böttcher, Ms. S. Brundaler, and Ms. G. Kühnreich for excellent technical assistance, and Ms. C. Maelicke for carefully proofreading the manuscript.
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This work was supported by grants from the Deutsche Forschungsgemeinschaft.
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Dünker, N., Krieglstein, K. Reduced programmed cell death in the retina and defects in lens and cornea of Tgfβ2 –/– Tgfβ3 –/– double-deficient mice. Cell Tissue Res 313, 1–10 (2003). https://doi.org/10.1007/s00441-003-0761-x
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DOI: https://doi.org/10.1007/s00441-003-0761-x