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4 protocols using gp62 c

1

Autophagy and Signaling Pathway Analysis

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Freshly harvested or −80°C frozen tissue was ground in liquid nitrogen and lysed using Tris lysis buffer (1 M Tris HCl, 1 M NaCl, 0.1 M EDTA, 10% NP-40). Lysate was run through PAGE (30 μg of protein per well), and blots were probed with antibodies against p62 (Progen, GP62-C), LC3 (Novus Biologicals, NB600-1384), p-PERK (Bioss, BS-3330R), PERK (Cell Signaling, 3192), p-eIF2α (Cell Signaling, 9721), eIF2α (Cell Signaling, 9722), AR, IGF-1β (Cell Signaling, 3027), p-Akt (Cell Signaling, 9271), Akt (Cell Signaling, 9272), p-S6 (Cell Signaling, 4858), S6 (Cell Signaling, 2217), and α-tubulin (Cell Signaling, 2125).
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2

Mitochondrial Dysfunction and Autophagy Analysis

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Antimycin A (Santa Cruz), oligomycin (Santa Cruz), CCCP (Sigma), bafilomycin A1 (Sigma), and MitoTracker CMXROS (ThermoFisher) were resuspended in DMSO (Sigma). Antimycin A and oligomycin were stored in aliquots at −80°C. CCCP and bafilomycin A1 were stored in aliquots at −20°C. Primary antibodies for immunofluorescent staining include the following: rabbit anti‐LC3 (Sigma L7543, 1:5,000), rabbit anti‐TOMM20 (Santa Cruz sc‐11415, 1:1,000), mouse anti‐Parkin (Cell Signaling 4211, 1:1,000), mouse anti‐DNA (Millipore CBL186, 1:1,000), mouse anti‐ATP5B (Santa Cruz sc‐166462, 1:1,000), mouse anti‐PEX13 (Santa Cruz sc‐271477, 1:100), rabbit anti‐PMP70 (Thermo Scientific PA1‐650, 1:1,000), mouse anti‐Flag (Sigma 184‐200UG, 1:1,000), and rabbit anti‐WIPI2 (Abcam ab105459, 1:500). Secondary antibodies were conjugated to AlexaFluor488, AlexaFluor594, and/or AlexaFluor647 (Invitrogen, 1:750). Primary antibodies for Western blot analyses include the following: mouse anti‐PEX13 (Santa Cruz sc‐271477, 1:200), rabbit anti‐ATG7 (Sigma A2856, 1:1,000), rabbit anti‐FANCC (Fanconi Anemia Research Fund FANCC‐C2, 1:1,000), mouse anti‐SMURF1 (Sigma WH0057154M1, 1:1,000), guinea pig anti‐p62 (Progen GP62‐C, 1:1,000), rabbit anti‐LC3 (Novus NB100‐2220, 1:1,000), and HRP‐conjugated mouse anti‐actin (Santa Cruz sc‐47778‐HRP, 1:2,000).
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3

Osteoclastogenesis Regulation by WDFY3

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All cell incubations were performed in culture medium consisting of αMEM with 2mM L-glutamine, 10% heat-inactivated FBS, 100 IU/ml Penicillin and 100 IU/ml Streptomycin (Life Technologies, 10007D). Mouse soluble RANKL (R&D Systems, 462TR) and M-CSF ELISA (R&D Systems, DY416), were used for in vitro experiments. CMG14-12 (CMG) media was generated as described before [22 ]. Anti-Wdfy3 (Abnova, clone 2F12), anti-WDFY3 (Novus, NBP1-03332), anti-SQSTM1 (Progen, GP62-C), LC3 antibody (Novus, NB100-2220), anti-β-actin antibody (Cell Signaling, 4970), 800 or 680 secondary antibodies (Li-Cor) were used for in vitro experiments. Cyto-ID kit (Enzo biochem, ENZ-51031) was used for autophagosome staining. LysoTracker DND-99 was used for lysosome staining (Life Technologies, L-7528).
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4

Protein Extraction and Western Blotting Protocol

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Total cell extracts were prepared in lysis buffer containing 62.5 mM Tris–HCl, 2% (w/v) SDS and 10% sucrose (pH 8) supplemented with EDTA-free protease (Roche, 04693159001) and phosphatase inhibitor cocktails (Roche, 04906837001) and sonicated four times at 60 Hz for 10 s on ice. Fractionation experiments after overexpression of aggregation-prone proteins were performed as described earlier [56 (link)] and specified in the Supplemental Methods. For Western blotting, equal amounts of proteins were separated by SDS-PAGE under denaturing conditions. Proteins were transferred on nitrocellulose membrane and proteins were detected by specific antibodies recognizing SQSTM1 (Progen, GP62-C), LC3B (Novus, NB-100-2220), FLAG (Sigma, F1804), tubulin (Sigma, T9026), SOD1 (Epitomics, 2018-1), ATG9A (Abcam, ab108338), histone H3 (Abcam, ab47915), α-synuclein (Abcam, ab27766), and DNAJC13 (kind gift from M. Farrer, Vancouver, and P. McPherson, Montreal, Canada). Species-specific secondary antibodies coupled to horseradish peroxidase (Dianova) were used to develop the Western blot with the Fusion system (Peqlab) or the Amersham Imager 600 (GE). Densitometry was performed with the AIDA software (Raytest) or ImageJ.
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