Abstract
We have generated and analysed null mutations in the mouse genes encoding three structurally related receptors with tyrosine kinase activity: Tyro 3, Axl, and Mer1,4. Mice lacking any single receptor, or any combination of two receptors, are viable and fertile, but male animals that lack all three receptors produce no mature sperm, owing to the progressive death of differentiating germ cells. This degenerative phenotype appears to result from a failure of the tropic support that is normally provided by Sertoli cells of the seminiferous tubules, whose function depends on testosterone and additional factors produced by Leydig cells5,7. Tyro 3, Axl and Mer are all normally expressed by Sertoli cells during postnatal development, whereas their ligands, Gas6 and protein S, are produced by Leydig cells before sexual maturity, and by both Leydig and Sertoli cells thereafter. Here we show that the concerted activation of Tyro 3, Axl and Mer in Sertoli cells is critical to the role that these cells play as nurturers of developing germ cells. Additional observations indicate that these receptors may also be essential for the tropic maintenance of diverse cell types in the mature nervous, immune and reproductive systems.
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Acknowledgements
This work was supported by grants from the NIH (to G.L., S.P.G., H.S.E., G.K.M.), and by a Markey fellowship to M.G., who was a student in the Neurosciences graduate program at the University of California, San Diego. S.P.G. is an Investigator of the Howard Hughes Medical Institute. We thank A. Prieto for advice and for Gas6 antibody, G. Yancopoulos for Gas6, protein S, and Axl cDNA probes, and D. Ortuño, P. Burrola, and D. Baynes for technical assistance.
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Lu, Q., Gore, M., Zhang, Q. et al. Tyro-3 family receptors are essential regulators of mammalian spermatogenesis. Nature 398, 723–728 (1999). https://doi.org/10.1038/19554
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DOI: https://doi.org/10.1038/19554