8
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Tian X, Kim JJ, Monkley SM, Gotoh N, Nandez R, Soda K, Inoue K, Balkin DM, Hassan H, Son SH, Lee Y, Moeckel G, Calderwood DA, Holzman LB, Critchley DR, Zent R, Reiser J, Ishibe S. Podocyte-associated talin1 is critical for glomerular filtration barrier maintenance. J Clin Invest 2014; 124:1098-113. [PMID: 24531545 PMCID: PMC3934159 DOI: 10.1172/jci69778] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Accepted: 12/05/2013] [Indexed: 12/28/2022] Open
Abstract
Podocytes are specialized actin-rich epithelial cells that line the kidney glomerular filtration barrier. The interface between the podocyte and the glomerular basement membrane requires integrins, and defects in either α3 or β1 integrin, or the α3β1 ligand laminin result in nephrotic syndrome in murine models. The large cytoskeletal protein talin1 is not only pivotal for integrin activation, but also directly links integrins to the actin cytoskeleton. Here, we found that mice lacking talin1 specifically in podocytes display severe proteinuria, foot process effacement, and kidney failure. Loss of talin1 in podocytes caused only a modest reduction in β1 integrin activation, podocyte cell adhesion, and cell spreading; however, the actin cytoskeleton of podocytes was profoundly altered by the loss of talin1. Evaluation of murine models of glomerular injury and patients with nephrotic syndrome revealed that calpain-induced talin1 cleavage in podocytes might promote pathogenesis of nephrotic syndrome. Furthermore, pharmacologic inhibition of calpain activity following glomerular injury substantially reduced talin1 cleavage, albuminuria, and foot process effacement. Collectively, these findings indicate that podocyte talin1 is critical for maintaining the integrity of the glomerular filtration barrier and provide insight into the pathogenesis of nephrotic syndrome.
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Affiliation(s)
- Xuefei Tian
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Jin Ju Kim
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Susan M. Monkley
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Nanami Gotoh
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Ramiro Nandez
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Keita Soda
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Kazunori Inoue
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Daniel M. Balkin
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Hossam Hassan
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Sung Hyun Son
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Yashang Lee
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Gilbert Moeckel
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - David A. Calderwood
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Lawrence B. Holzman
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - David R. Critchley
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Roy Zent
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Jochen Reiser
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
| | - Shuta Ishibe
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Miami, Miami, Florida, USA.
Department of Biochemistry, University of Leicester, Leicester, United Kingdom.
Department of Cell Biology,
Howard Hughes Medical Institute,
Program in Cellular Neuroscience, Neurodegeneration, and Repair,
Department of Pathology, and
Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Department of Medicine, Vanderbilt University and Veterans Affairs Hospital, Nashville, Tennessee, USA.
Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA
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9
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Guzman J, Jauregui AN, Merscher-Gomez S, Maiguel D, Muresan C, Mitrofanova A, Diez-Sampedro A, Szust J, Yoo TH, Villarreal R, Pedigo C, Molano RD, Johnson K, Kahn B, Hartleben B, Huber TB, Saha J, Burke GW, Abel ED, Brosius FC, Fornoni A. Podocyte-specific GLUT4-deficient mice have fewer and larger podocytes and are protected from diabetic nephropathy. Diabetes 2014; 63:701-14. [PMID: 24101677 PMCID: PMC3900538 DOI: 10.2337/db13-0752] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Podocytes are a major component of the glomerular filtration barrier, and their ability to sense insulin is essential to prevent proteinuria. Here we identify the insulin downstream effector GLUT4 as a key modulator of podocyte function in diabetic nephropathy (DN). Mice with a podocyte-specific deletion of GLUT4 (G4 KO) did not develop albuminuria despite having larger and fewer podocytes than wild-type (WT) mice. Glomeruli from G4 KO mice were protected from diabetes-induced hypertrophy, mesangial expansion, and albuminuria and failed to activate the mammalian target of rapamycin (mTOR) pathway. In order to investigate whether the protection observed in G4 KO mice was due to the failure to activate mTOR, we used three independent in vivo experiments. G4 KO mice did not develop lipopolysaccharide-induced albuminuria, which requires mTOR activation. On the contrary, G4 KO mice as well as WT mice treated with the mTOR inhibitor rapamycin developed worse adriamycin-induced nephropathy than WT mice, consistent with the fact that adriamycin toxicity is augmented by mTOR inhibition. In summary, GLUT4 deficiency in podocytes affects podocyte nutrient sensing, results in fewer and larger cells, and protects mice from the development of DN. This is the first evidence that podocyte hypertrophy concomitant with podocytopenia may be associated with protection from proteinuria.
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Affiliation(s)
- Johanna Guzman
- Diabetes Research Institute, Miller School of Medicine, University of Miami, Miami, FL
- Department of Medicine, Division of Nephrology and Hypertension, Miller School of Medicine, University of Miami, Miami, FL
| | - Alexandra N. Jauregui
- Diabetes Research Institute, Miller School of Medicine, University of Miami, Miami, FL
| | - Sandra Merscher-Gomez
- Department of Medicine, Division of Nephrology and Hypertension, Miller School of Medicine, University of Miami, Miami, FL
| | - Dony Maiguel
- Diabetes Research Institute, Miller School of Medicine, University of Miami, Miami, FL
| | - Cristina Muresan
- Department of Medicine, Division of Nephrology and Hypertension, Miller School of Medicine, University of Miami, Miami, FL
| | - Alla Mitrofanova
- Department of Medicine, Division of Nephrology and Hypertension, Miller School of Medicine, University of Miami, Miami, FL
| | - Ana Diez-Sampedro
- Department of Physiology, Miller School of Medicine, University of Miami, Miami, FL
| | - Joel Szust
- Diabetes Research Institute, Miller School of Medicine, University of Miami, Miami, FL
| | - Tae-Hyun Yoo
- Department of Medicine, Division of Nephrology and Hypertension, Miller School of Medicine, University of Miami, Miami, FL
- Department of Surgery, Miller School of Medicine, University of Miami, Miami, FL
| | - Rodrigo Villarreal
- Diabetes Research Institute, Miller School of Medicine, University of Miami, Miami, FL
- Department of Medicine, Division of Nephrology and Hypertension, Miller School of Medicine, University of Miami, Miami, FL
| | - Christopher Pedigo
- Department of Medicine, Division of Nephrology and Hypertension, Miller School of Medicine, University of Miami, Miami, FL
| | - R. Damaris Molano
- Diabetes Research Institute, Miller School of Medicine, University of Miami, Miami, FL
| | - Kevin Johnson
- Diabetes Research Institute, Miller School of Medicine, University of Miami, Miami, FL
| | - Barbara Kahn
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
| | | | - Tobias B. Huber
- Division of Nephrology, Freiburg University, Freiburg, Germany
| | - Jharna Saha
- Division of Nephrology, University of Michigan, Ann Arbor, MI
| | - George W. Burke
- Department of Surgery, Miller School of Medicine, University of Miami, Miami, FL
| | - E. Dale Abel
- Division of Endocrinology, Metabolism and Diabetes and Program in Molecular Medicine, University of Utah, Salt Lake City, UT
| | | | - Alessia Fornoni
- Diabetes Research Institute, Miller School of Medicine, University of Miami, Miami, FL
- Department of Medicine, Division of Nephrology and Hypertension, Miller School of Medicine, University of Miami, Miami, FL
- Corresponding author: Alessia Fornoni,
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