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Cellular and subcellular localization of ADP-ribosylation factor 6 in mouse peripheral tissues

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Abstract

ADP-ribosylation factor 6 (Arf6) is a small GTPase that regulates endosomal trafficking and actin cytoskeleton remodeling. In the present study, we comprehensively examined the cellular and subcellular localization of Arf6 in adult mouse peripheral tissues by immunofluorescence and immunoelectron microscopy using the heat-induced antigen retrieval method with Tris–EDTA buffer (pH 9.0). Marked immunolabeling of Arf6 was observed particularly in epithelial cells of several tissues including the esophagus, stomach, small and large intestines, trachea, kidney, epididymis, oviduct, and uterus. In most epithelial cells of simple or pseudostratified epithelia, Arf6 exhibited predominant localization to the basolateral membrane and a subpopulation of endosomes. At an electron microscopic level, Arf6 was localized along the basolateral membrane, with dense accumulation at interdigitating processes and infoldings. Arf6 was present in a ring-like appearance at intercellular bridges in spermatogonia and spermatocytes in the testis and at the Flemming body of cytokinetic somatic cells in the ovarian follicle, thymus, and spleen. The present study provides anatomical clues to help understand the physiological roles of Arf6 at the whole animal level.

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Acknowledgements

The authors thank staff members of the Bioimaging center at Kitasato University School of Medicine for their technical support in electron microscopic analyses. This study was supported by KAKENHI Grant no. 15H04672 to H.S. from the Japan Society for the Promotion of Science.

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Correspondence to Hiroyuki Sakagami.

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Katsumata, O., Mori, M., Sawane, Y. et al. Cellular and subcellular localization of ADP-ribosylation factor 6 in mouse peripheral tissues. Histochem Cell Biol 148, 577–596 (2017). https://doi.org/10.1007/s00418-017-1599-8

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  • DOI: https://doi.org/10.1007/s00418-017-1599-8

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