An essential role of the universal polarity protein, aPKClambda, on the maintenance of podocyte slit diaphragms.
Glomerular visceral epithelial cells (podocytes) contain interdigitated processes that form specialized intercellular junctions, termed slit diaphragms, which provide a selective filtration barrier in the renal glomerulus. Analyses of disease-causing mutations in familial nephrotic syndromes and tar...
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Public Library of Science (PLoS)
2009-01-01
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Online Access: | http://europepmc.org/articles/PMC2614475?pdf=render |
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author | Tomonori Hirose Daisuke Satoh Hidetake Kurihara Chiho Kusaka Hiroko Hirose Kazunori Akimoto Taiji Matsusaka Iekuni Ichikawa Tetsuo Noda Shigeo Ohno |
author_facet | Tomonori Hirose Daisuke Satoh Hidetake Kurihara Chiho Kusaka Hiroko Hirose Kazunori Akimoto Taiji Matsusaka Iekuni Ichikawa Tetsuo Noda Shigeo Ohno |
author_sort | Tomonori Hirose |
collection | DOAJ |
description | Glomerular visceral epithelial cells (podocytes) contain interdigitated processes that form specialized intercellular junctions, termed slit diaphragms, which provide a selective filtration barrier in the renal glomerulus. Analyses of disease-causing mutations in familial nephrotic syndromes and targeted mutagenesis in mice have revealed critical roles of several proteins in the assembly of slit diaphragms. The nephrin-podocin complex is the main constituent of slit diaphragms. However, the molecular mechanisms regulating these proteins to maintain the slit diaphragms are still largely unknown. Here, we demonstrate that the PAR3-atypical protein kinase C (aPKC)-PAR6beta cell polarity proteins co-localize to the slit diaphragms with nephrin. Furthermore, selective depletion of aPKClambda in mouse podocytes results in the disassembly of slit diaphragms, a disturbance in apico-basal cell polarity, and focal segmental glomerulosclerosis (FSGS). The aPKC-PAR3 complex associates with the nephrin-podocin complex in podocytes through direct interaction between PAR3 and nephrin, and the kinase activity of aPKC is required for the appropriate distribution of nephrin and podocin in podocytes. These observations not only establish a critical function of the polarity proteins in the maintenance of slit diaphragms, but also imply their potential involvement in renal failure in FSGS. |
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spelling | doaj.art-34963a7f651a4c7bb23169ef0133c4342022-12-21T22:13:49ZengPublic Library of Science (PLoS)PLoS ONE1932-62032009-01-0141e419410.1371/journal.pone.0004194An essential role of the universal polarity protein, aPKClambda, on the maintenance of podocyte slit diaphragms.Tomonori HiroseDaisuke SatohHidetake KuriharaChiho KusakaHiroko HiroseKazunori AkimotoTaiji MatsusakaIekuni IchikawaTetsuo NodaShigeo OhnoGlomerular visceral epithelial cells (podocytes) contain interdigitated processes that form specialized intercellular junctions, termed slit diaphragms, which provide a selective filtration barrier in the renal glomerulus. Analyses of disease-causing mutations in familial nephrotic syndromes and targeted mutagenesis in mice have revealed critical roles of several proteins in the assembly of slit diaphragms. The nephrin-podocin complex is the main constituent of slit diaphragms. However, the molecular mechanisms regulating these proteins to maintain the slit diaphragms are still largely unknown. Here, we demonstrate that the PAR3-atypical protein kinase C (aPKC)-PAR6beta cell polarity proteins co-localize to the slit diaphragms with nephrin. Furthermore, selective depletion of aPKClambda in mouse podocytes results in the disassembly of slit diaphragms, a disturbance in apico-basal cell polarity, and focal segmental glomerulosclerosis (FSGS). The aPKC-PAR3 complex associates with the nephrin-podocin complex in podocytes through direct interaction between PAR3 and nephrin, and the kinase activity of aPKC is required for the appropriate distribution of nephrin and podocin in podocytes. These observations not only establish a critical function of the polarity proteins in the maintenance of slit diaphragms, but also imply their potential involvement in renal failure in FSGS.http://europepmc.org/articles/PMC2614475?pdf=render |
spellingShingle | Tomonori Hirose Daisuke Satoh Hidetake Kurihara Chiho Kusaka Hiroko Hirose Kazunori Akimoto Taiji Matsusaka Iekuni Ichikawa Tetsuo Noda Shigeo Ohno An essential role of the universal polarity protein, aPKClambda, on the maintenance of podocyte slit diaphragms. PLoS ONE |
title | An essential role of the universal polarity protein, aPKClambda, on the maintenance of podocyte slit diaphragms. |
title_full | An essential role of the universal polarity protein, aPKClambda, on the maintenance of podocyte slit diaphragms. |
title_fullStr | An essential role of the universal polarity protein, aPKClambda, on the maintenance of podocyte slit diaphragms. |
title_full_unstemmed | An essential role of the universal polarity protein, aPKClambda, on the maintenance of podocyte slit diaphragms. |
title_short | An essential role of the universal polarity protein, aPKClambda, on the maintenance of podocyte slit diaphragms. |
title_sort | essential role of the universal polarity protein apkclambda on the maintenance of podocyte slit diaphragms |
url | http://europepmc.org/articles/PMC2614475?pdf=render |
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