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Serum Response Factor Is Essential for Maintenance of Podocyte Structure and Function

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Serum Response Factor Is Essential for Maintenance of Podocyte Structure and Function BRIEF COMMUNICATION www.jasn.org Serum Response Factor Is Essential for Maintenance of Podocyte Structure and Function Bing Guo,1,2 Qing Lyu,1 Orazio J. Slivano,1 Ronald Dirkx,1 Christine K. Christie,1 Jan Czyzyk,3 Aram F. Hezel,4 Ali G. Gharavi,5 Eric M. Small,1 and Joseph M. Miano1 1Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York; 2Department of Hepatobiliary Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; 3Department of Pathology and Laboratory Medicine and 4James P. Wilmot Cancer Center, University of Rochester School of Medicine and Dentistry, Rochester, New York; and 5Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York ABSTRACT Podocytes contain an intricate actin cytoskeleton that is essential for the specialized SRF is expressed in podocytes of the function of this cell type in renal filtration. Serum response factor (SRF) is a master adult mouse and human kidney (Figure transcription factor for the actin cytoskeleton, but the in vivo expression and function 1A), with onset of expression in mice of SRF in podocytes are unknown. We found that SRF protein colocalizes with podo- occurring between embryonic day 18.5 cyte markers in human and mouse kidneys. Compared with littermate controls, mice in and postnatal day 0 (Supplemental Fig- which the Srf gene was conditionally inactivated with NPHS2-Cre exhibited early post- ure 1A). A genetic cross to inactivate Srf natal proteinuria, hypoalbuminemia, and azotemia. Histologic changes in the mutant in podocytes (Figure 1B) yielded an mice included glomerular capillary dilation and mild glomerulosclerosis, with reduced expected Mendelian ratio of pups (Sup- expression of multiple canonical podocyte markers. We also noted tubular dilation, cell plemental Figure 1B) with normal proliferation, and protein casts as well as reactive changes in mesangial cells and in- glomerular structure (Supplemental terstitial inflammation. Ultrastructure analysis disclosed foot process effacement with Figure 1C). Furthermore, quantitative loss of slit diaphragms. To ascertain the importance of SRF cofactors in podocyte func- immunofluorescence microscopy (IFM) tion, we disabled the myocardin-related transcription factor A and B genes. Although showed no change in the expression of loss of either SRF cofactor alone had no observable effect in the kidney, deficiency of SRF in podocytes of newborn, podocyte- both recapitulated the Srf-null phenotype. These results establish a vital role for SRF specific Srf KO mice (Supplemental Fig- and two SRF cofactors in the maintenance of podocyte structure and function. ure 1, D and E). Together, these results suggest that SRF plays little, if any, role in J Am Soc Nephrol 29: 416–422, 2018. doi: https://doi.org/10.1681/ASN.2017050473 glomerulogenesis during embryonic de- velopment. Asignificant reduction of SRF/WT1- positive cells was observed in Srf KO mice Podocytes are terminally differentiated Podocyte-specificknockout(KO)ofSRF- between 3 and 6 weeks after birth (Figure cells of the glomerulus with elaborate ex- dependent cytoskeletal-associated genes, 1, C and D, Supplemental Figure 2). Al- tensions of the cell body that terminate as such as Tln1,6 Cfl1,7 Itgb1,8 and Tjp1,9 re- though Srf KO mice were indistinguishable interdigitating foot processes separated sults in defective glomerular function. SRF by slit diaphragms essential for selective is regulated by PRKDC,10 a kinase that has filtration at the glomerular filtration been implicated as a susceptibility gene for Received May 1, 2017. Accepted October 11, 2017. barrier. adriamycin-induced nephropathy,11 and Maintenance of podocyte structure and INF2, which has mutations that contribute Published online ahead of print. Publication date function is dependent on a complex actin to FSGS.12 However, the specificroleof available at www.jasn.org. cytoskeleton.1 Serum response factor SRF in the kidney and particularly, within Correspondence: Dr. Joseph M. Miano, Aab (SRF) is a transcription factor that podocytes is ill defined. Here, evidence is Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, 601 binds a DNA cis-acting element known provided in support of an essential role of Elmwood Avenue, Rochester, NY 14642. Email: j.m. as a CArG box.2 Conserved CArG boxes SRF and two of its cofactors in maintaining [email protected] are adjacent to thousands of genes, includ- the structure and function of podocytes in Copyright © 2018 by the American Society of – ing numerous cytoskeletal genes.3 5 mice. Nephrology 416 ISSN : 1046-6673/2902-416 J Am Soc Nephrol 29: 416–422, 2018 www.jasn.org BRIEF COMMUNICATION Significance statement The structure and function of podocytes are dependent on an intricate actin cytoskele- ton. Serum response factor (SRF) is a mas- ter regulator of the actin cytoskeleton; however, there is little information about SRFinpodocytebiology.Podocyte-specific knockout of Srf in mice results in foot pro- cess effacement and renal failure, leading to early death. Combined genetic in- activation of the SRF cofactors Mkl1/Mkl2 phenocopies the Srf knockout. Cultured podocytes with reduced SRF exhibit de- fects in the actin cytoskeleton and dys- regulated expression of several genes, including those necessary for a functional actin cytoskeleton. SRF and MKL1/MKL2 arecriticalforpodocytestructureand normal renal function. Future work should evaluate these factors in human renal disease and interrogate target genes essential for podocyte homeostasis. Quantitative histopathology established progressive tubular dilation, protein cast formation, and glomerular capil- lary dilation in Srf KO mice (Figure 2, FandG).Lotus tetragonolobus lectin staining indicated dilation of both prox- imal and distal tubules (Supplemental Figure 3). Occasional instances of glo- merulosclerosis were observed at 6 weeks of age with little to no interstitial fibrosis (Supplemental Figure 4), likely due to the rapid onset of kidney failure. IFM of Srf KO mice showed lower expression and irregular distribution of several po- docyte markers, including a–Actinin-4, Synaptopodin, Podocin, and Nephrin (Figure 3, A–C). Furthermore, upregu- lation of smooth muscle a-actin and Figure 1. Generation of podocyte-specific Srf KO mice. (A) IFM of sections of human and vWF was seen in Srf KO glomeruli (Sup- mouse kidney shows SRF expression in both podocytes and nonpodocytes. Podocytes plemental Figure 5, A and B), suggestive were identified by immunolabeling of Synaptopodin or WT1. Note that efforts to reliably of reactive changes in mesangial cells show WT1 in human podocytes were unsuccessful. (B) General strategy for generating and glomerular capillary endothelial fi podocyte-speci c Srf KO mice. (C) Representative images of control and mutant glomeruli cells, respectively. Srf KO mice also ex- immunolabeled with anti-WT1 (podocyte marker) and anti-SRF antibodies (Supplemental fi Figure 2 shows single-channel images). (D) Quantitative IFM of control and mutant glo- hibited an in ltration of CD45-positive fl meruli (n=15) shows 44.5%, 68.8%, and 62.2% reductions of SRF+/WT1+ podocytes at 3, 4, in ammatory cells within the tubuloin- and 6 weeks, respectively. Scale bars, 50 mminA,upperpanel;20mm in A, lower panel and terstitium and Ki67 staining in tubular C. ***P,0.001. epithelial cells; no such findings were evident in control mice or within the from littermate controls at birth, they leukocyturia (Figure 2, C and D) as well as glomerulus of Srf KO mice (Supplemen- exhibited a notable decrease in body size elevated serum creatinine and BUN, with tal Figure 5, C–E). The presence of (Figure 2A) and body weight (Figure 2B) concomitant hypoalbuminemia (Figure inflammatory cells and proliferative tu- at 6 weeks of age. Srf KOs also displayed 2E). Death occurred by 7 weeks of age bular epithelial cells of Srf KO mice increased urinary protein, hematuria, and in both male and female Srf KO mice. likely represents a secondary response to J Am Soc Nephrol 29: 416–422, 2018 Podocyte-Specific Srf Knockout 417 BRIEF COMMUNICATION www.jasn.org Figure 2. Postnatal nephropathy and renal failure in podocyte-specific Srf KO mice. (A and B) Decreased body size and body weight in Srf KO mice compared with control mice at 6 weeks of age (n$5 age-matched male mice). (C) Coomassie Blue staining of urine samples shows massive proteinuria in 3-week-old mutant mice. (D) Dipstick analysis indicates increased urinary protein (left panel), red blood cells (RBCs; center panel), and white blood cells (WBCs; right panel) of mutant mice between 3 and 6 weeks of age (n$7). (E) Serum analysis reveals elevated creatinine (left panel) and BUN (center panel) and decreased albumin (right panel) in 6-week-old Srf KO mice (n$5). (F) He- matoxylin and Eosin staining of kidneys at 6 weeks of age. Note dilated tubules (arrowhead), glomerular capillary dilation (asterisk), and cast formation (arrow) in Srf KO kidneys (n$3). (G) Quantitative measures of dilated tubules, protein casts, and glomerular capillary dilation in control versus Srf KO kidneys at 3, 4, and 6 weeks of age (n$30 fields of view in three or more mice per condition). Scale bars, 100 mmin F, top panel; 40 mm in F, middle panel; 20 mminF,bottompanel.*P,0.05; **P,0.01; ***P,0.001. 418 Journal of the American Society of Nephrology J Am Soc Nephrol 29: 416–422, 2018 www.jasn.org BRIEF COMMUNICATION Figure 3. Podocyte marker expression and ultrastructural abnormalities in Srf KO mice. (A–C) IFM shows diminished and punctate staining of (A) a–Actinin-4, (B) Synaptopodin and Podocin, and (C) Nephrin in mutant mice (n=3) at 4 and 6 weeks of age. (D and E) Representative (D) scanning electron microscopy (SEM) and (E) transmission electron microscopy (TEM) of control and Srf KO kidneys (n=2 each for control and mutant). Note (D, lower panel) foot process effacement and (E, bottom panel) loss of slit diaphragms in Srf KO.
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