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  • Original Paper
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Progressive impairment of kidneys and reproductive organs in mice lacking Rho GDIα

Abstract

The Rho small G protein family members regulate various actin cytoskeleton-dependent cell functions. The Rho GDI (GDP dissociation inhibitor) family, consisting of Rho GDIα, -β, and -γ, is a regulator that keeps the Rho family members in the cytosol as the GDP-bound inactive form and translocates the GDP-bound form from the membranes to the cytosol after the GTP-bound form accomplishes their functions. Rho GDIα is ubiquitously expressed in mouse tissues and shows GDI activity on all the Rho family members in vitro. We have generated mice lacking Rho GDIα by homologous recombination to clarify its in vivo function. Rho GDIα −/− mice showed several abnormal phenotypes. Firstly, Rho GDIα −/− mice were initially viable but developed massive proteinuria mimicking nephrotic syndrome, leading to death due to renal failure within a year. Histologically, degeneration of tubular epithelial cells and dilatation of distal and collecting tubules were readily detected in the kidneys. Secondly, Rho GDIα −/− male mice were infertile and showed impaired spermatogenesis with vacuolar degeneration of seminiferous tubules in their testes. Thirdly, Rho GDIα −/− embryos derived from Rho GDIα −/− female mice were defective in the postimplantation development. In addition, these morphological and functional abnormalities showed age-dependent progression. These results suggest that the signaling pathways of the Rho family members regulated by Rho GDIα play important roles in maintaining the structure and physiological function of at least kidneys and reproductive systems in adult mice.

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Acknowledgements

We thank T Sasaki, K Tanaka, and other members at the Department of Molecular Biology and Biochemistry, Osaka University Medical School for their helpful discussion and materials.

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Togawa, A., Miyoshi, J., Ishizaki, H. et al. Progressive impairment of kidneys and reproductive organs in mice lacking Rho GDIα. Oncogene 18, 5373–5380 (1999). https://doi.org/10.1038/sj.onc.1202921

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