Sorting Nexin 9 facilitates podocin endocytosis in the injured podocyte

The irreversibility of glomerulosclerotic changes depends on the degree of podocyte injury. We have previously demonstrated the endocytic translocation of podocin to the subcellular area in severely injured podocytes and found that this process is the primary disease trigger. Here we identified the...

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Veröffentlicht in:Scientific reports 2017-03, Vol.7 (1), p.43921-43921, Article 43921
Hauptverfasser: Sasaki, Yu, Hidaka, Teruo, Ueno, Takashi, Akiba-Takagi, Miyuki, Oliva Trejo, Juan Alejandro, Seki, Takuto, Nagai-Hosoe, Yoshiko, Tanaka, Eriko, Horikoshi, Satoshi, Tomino, Yasuhiko, Suzuki, Yusuke, Asanuma, Katsuhiko
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container_title Scientific reports
container_volume 7
creator Sasaki, Yu
Hidaka, Teruo
Ueno, Takashi
Akiba-Takagi, Miyuki
Oliva Trejo, Juan Alejandro
Seki, Takuto
Nagai-Hosoe, Yoshiko
Tanaka, Eriko
Horikoshi, Satoshi
Tomino, Yasuhiko
Suzuki, Yusuke
Asanuma, Katsuhiko
description The irreversibility of glomerulosclerotic changes depends on the degree of podocyte injury. We have previously demonstrated the endocytic translocation of podocin to the subcellular area in severely injured podocytes and found that this process is the primary disease trigger. Here we identified the protein sorting nexin 9 (SNX9) as a novel facilitator of podocin endocytosis in a yeast two-hybrid analysis. SNX9 is involved in clathrin-mediated endocytosis, actin rearrangement and vesicle transport regulation. Our results revealed and confirmed that SNX9 interacts with podocin exclusively through the Bin–Amphiphysin–Rvs (BAR) domain of SNX9. Immunofluorescence staining revealed the expression of SNX9 in response to podocyte adriamycin-induced injury both in vitro and in vivo . Finally, an analysis of human glomerular disease biopsy samples demonstrated strong SNX9 expression and co-localization with podocin in samples representative of severe podocyte injury, such as IgA nephropathy with poor prognosis, membranous nephropathy and focal segmental glomerulosclerosis. In conclusion, we identified SNX9 as a facilitator of podocin endocytosis in severe podocyte injury and demonstrated the expression of SNX9 in the podocytes of both nephropathy model mice and human patients with irreversible glomerular disease.
doi_str_mv 10.1038/srep43921
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We have previously demonstrated the endocytic translocation of podocin to the subcellular area in severely injured podocytes and found that this process is the primary disease trigger. Here we identified the protein sorting nexin 9 (SNX9) as a novel facilitator of podocin endocytosis in a yeast two-hybrid analysis. SNX9 is involved in clathrin-mediated endocytosis, actin rearrangement and vesicle transport regulation. Our results revealed and confirmed that SNX9 interacts with podocin exclusively through the Bin–Amphiphysin–Rvs (BAR) domain of SNX9. Immunofluorescence staining revealed the expression of SNX9 in response to podocyte adriamycin-induced injury both in vitro and in vivo . Finally, an analysis of human glomerular disease biopsy samples demonstrated strong SNX9 expression and co-localization with podocin in samples representative of severe podocyte injury, such as IgA nephropathy with poor prognosis, membranous nephropathy and focal segmental glomerulosclerosis. In conclusion, we identified SNX9 as a facilitator of podocin endocytosis in severe podocyte injury and demonstrated the expression of SNX9 in the podocytes of both nephropathy model mice and human patients with irreversible glomerular disease.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>28266622</pmid><doi>10.1038/srep43921</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record>
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subjects 13/109
13/51
14/19
38/109
38/111
38/89
631/45/612/1237
631/80/313/1461
64/60
692/4022/1585/2759
692/4022/272/1684/1587/2101
82/29
82/80
Actin
Animals
Biopsy
Clathrin
Disease Models, Animal
Endocytosis
Glomerulonephritis, IGA - pathology
Glomerulonephritis, Membranous - pathology
Glomerulosclerosis, Focal Segmental - pathology
Humanities and Social Sciences
Humans
IgA nephropathy
Immunofluorescence
Immunoglobulin A
Immunohistochemistry
Intracellular Signaling Peptides and Proteins - metabolism
Localization
Membrane Proteins - metabolism
Membranous nephropathy
Mice, Inbred BALB C
multidisciplinary
Nexin
Podocytes - metabolism
Protein Binding
Protein Interaction Mapping
Protein transport
Rodents
Science
Sorting Nexins - metabolism
Translocation
Two-Hybrid System Techniques
Yeasts
title Sorting Nexin 9 facilitates podocin endocytosis in the injured podocyte
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