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Biochemistry

Isolation of Glomeruli and In Vivo Labeling of Glomerular Cell Surface Proteins

Published: January 18th, 2019

DOI:

10.3791/58542

1Department of Nephrology, Medical Faculty, Heinrich-Heine-University, 2Institute of Cellular and Integrative Physiology, University Medical Center Hamburg-Eppendorf

Here we present a protocol for murine in vivo labeling of glomerular cell surface proteins with biotin. This protocol contains information on how to perfuse mouse kidneys, isolate glomeruli, and perform endogenous immunoprecipitation of the protein of interest.

Proteinuria results from the disruption of the glomerular filter that is composed of the fenestrated endothelium, glomerular basement membrane, and podocytes with their slit diaphragms. The delicate structure of the glomerular filter, especially the slit diaphragm, relies on the interplay of diverse cell surface proteins. Studying these cell surface proteins has so far been limited to in vitro studies or histologic analysis. Here, we present a murine in vivo biotinylation labeling method, which enables the study of glomerular cell surface proteins under physiologic and pathophysiologic conditions. This protocol contains information on how to perfuse mouse kidneys, isolate glomeruli, and perform endogenous immunoprecipitation of a protein of interest. Semi-quantitation of glomerular cell surface abundance is readily available with this novel method, and all proteins accessible to biotin perfusion and immunoprecipitation can be studied. In addition, isolation of glomeruli with or without biotinylation enables further analysis of glomerular RNA and protein as well as primary glomerular cell culture (i.e., primary podocyte cell culture).

Proteinuria is a hallmark of glomerular injury and usually accompanies disruption of the glomerular filter1. The glomerular filter is composed of the fenestrated endothelium, glomerular basement membrane, and podocytes. The delicate molecular structure of the glomerular filter is highly dynamic and subject to cell surface protein trafficking in both healthy and diseased kidneys2,3,4,5,6. Endocytosis of cell surface proteins has been shown to be essential for the survival of podocytes....

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Mice were obtained as an in-house breed from the local animal care facility or from Janvier Labs in France. The investigations were conducted according to the guidelines outlined in the Guide for Care and Use of Laboratory Animals (U.S. National Institutes of Health Publication No. 85-23, revised 1996). All animal experiments were performed in accordance with the relevant institutional approvals (state government LANUV reference number AZ:84-02.04. 2016.A435).

1. Preparation of Instruments, Solu.......

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To isolate glomeruli accurately, it is necessary to perfuse murine kidneys with PBSCM first. Perfusion with PBSCM turns kidneys pale (Figure 1A). Embolization of glomeruli with magnetic beads will be visible as brown dots on the kidney surface (Figure 1B). Isolation of glomeruli with the magnet catcher may show contamination with renal tubuli (Figure 1C

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The presented method enables successful isolation of glomeruli to investigate glomerular RNA or protein. In addition, primary glomerular cell cultures can be performed from the isolated glomeruli. If biotin is applied before glomerular isolation, labeling of glomerular cell surface proteins can be performed. With this method, in vivo glomerular cell surface protein trafficking can be studied, and semi-quantitation of protein abundance is possible. The most critical steps for successfully testing glomerular cell .......

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The authors thank Blanka Duvnjak for her exceptional technical assistance. This work was supported by Deutsche Forschungsgemeinschaft (www.dfg.de) WO1811/2-1 to M.W. and QU280/3-1 to I.Q. The funder had no role in the study design, data collection, data analysis, decision to publish, and preparation of the manuscript.

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Name Company Catalog Number Comments
Motic SMZ168 BL Motic SMZ168BL microscope for mouse surgery
KL1500LCD Pulch and Lorenz microscopy 150500 light for mouse surgery
Rompun (Xylazin) 2% Bayer PZN:01320422 anesthesia
Microfederschere Braun, Aesculap FD100R fine scissors, for cut into the aorta
Durotip Feine Scheren Braun, Aesculap BC210R for abdominal cut
Anatomische Pinzette Braun, Aesculap BD215R for surgery until the abdomen is opened
Präparierklemme Aesculap BJ008R for surgery 
Seraflex Serag Wiessner IC108000 silk thread
Ketamine 10% Medistar anesthesia
Rompun (Xylazin) 2% Bayer anesthesia
Fine Bore Polythene Tubing ID 0.28mm OD 0.61mm Portex 800/100/100 Catheter
Fine Bore Polythene Tubing ID 0.58mm OD 0.96mm Portex 800/100/200 Catheter
Harvard apparatus 11 Plus Harvard Apparatus 70-2209 syringe pump
EZ-link Sulfo-NHC-LC-Biotin Thermo Scientific 21335 biotin
Dynabeads Untouched Mouse T-cells Invitrogen 11413D to embolize glomeruli
Collagenase A Roche 10103578001 to digest kidney tissue
DynaMag-2 Invitrogen 123.21D Magnet catcher
100µm cell stainer Greiner-bio 542000 for glomerular isolation
Axiovert 40 CFL Zeiss non available to confirm glomerular purity
TissueRuptor Quiagen 9002755 Tissue homogenizer
CHAPS Sigma-Aldrich C3023 for lysis buffer
Tris-HCL Sigma-Aldrich T5941 for lysis buffer
NaCl VWR chemicals 27810295 for lysis buffer
NaF Sigma-Aldrich 201154 for lysis buffer
EDTA Sigma-Aldrich E5134 for lysis buffer
ATP Sigma-Aldrich 34369-07-8 for lysis buffer
Pierce BCA Protein Assay Kit Thermo Scientific 23225 Follow the manufacturer's instructions
nephrin antibody Progen GP-N2 for westernblot
Polyclonal goat anti-podocalyxin antibody R&D Systems AF15556-SP for westernblot
Streptavidin Agarose Resin Thermo Scientific 20347 for immunoprecipitation
Protein A sepharose CL-4B GE Healthcare 17096303 for immunoprecipitation
polyclonal rabbit anti-p57 antibody SCBT sc-8298 for Immunohistochemistry
mouse monoclonal anti-beta actin antibody, clone AC-74 Sigma-Aldrich A2228 Western blot loading control
rabbit anti-p44/42 cell signalling 4695 for westernblot
Pierce High sensitivity streptavidin-HRP Thermo Scientific 21130 for westernblot
polyclonal mouse ICAM-2 antibody R&D Systems AF774 for westernblot
polyclonal mouse anti-VE-cadherin R&D Systems AF1002 for westernblot

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