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2 protocols using letm1 16024 1 ap

1

Protein Analysis of H9c2 Cell Lysates

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H9c2 cells were lysed in RIPA lysis buffer (Invitrogen, Carlsbad, CA, United States), supplemented with 1 mM PMSF and 1% protease inhibitor cocktail (Sigma-Aldrich). Lysates were incubated on ice for 30 min followed by centrifugation at 17,000 g for 15 min at 4°C. The supernatant was collected and quantified using the bicinchoninic acid assay (Thermo Fisher Scientific). Proteins were resolved on 4–20% mini-PROTEAN TGX gels (BioRad) and transferred to nitrocellulose membranes (0.45 μm, BioRad). The membranes were blotted with the following antibodies: Letm1 (16024-1-AP; Proteintech), NCLX (ab83551; Abcam), MCU (14997; Cell Signaling Technology) and GAPDH (CB1001; Millipore). GAPDH was used as the loading control. The LI-COR infrared fluorescent mouse (925–68020) and rabbit (925–32211) secondary antibodies were used for visualization by a LI-COR Odyssey scanner. Band quantification (densitometry) was performed using ImageJ and Origin 8 software (OriginLab Corporation, Northampton, MA, United States).
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2

Immunoblotting Analysis of Metabolic Proteins

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Specific proteins were detected using the following rabbit monoclonal antibodies: phospho-SAPK/JNK (Thr183/Tyr185, 4668), SAPK/JNK (9252), phospho-Akt (Ser473, 4060), Akt (9272), S6 ribosomal protein (2217S), phospho–S6 ribosomal protein (4856S), glyceraldehyde phosphate dehydrogenase (GAPDH) (2118), LC3A/B (12741) MCU (14997) (Cell Signaling Technologies), and MRPP3 (HPA020459) (Sigma-Prestige) diluted 1:1000; rabbit polyclonal antibodies: GLUT2 (54460) (Abcam) diluted 1:1000, GLUT4 (PA-1-1065) (Thermo Fisher Scientific), CPTII (OAAN00972) (Aviva System Biology) diluted 1:500, Letm1 (16024-1-AP) (Proteintech) diluted 1:1000, MRPP2 (HPA001432) (Sigma-Prestige) diluted 1:1000, LRPPRC (sc66844) (Santa Cruz Biotechnology) diluted 1:500, TFAM (ab131607) (Abcam) diluted 1:1000; mouse monoclonal antibodies: total OXPHOS Cocktail Antibody (ab110412), VDAC (ab14734), and SDHA (ab14715) (Abcam), diluted 1:1000. IRDye 800CW goat anti-rabbit immunoglobulin G (IgG) or IRDye 680LT goat anti-mouse IgG (LI-COR Biosciences) secondary antibodies were used, and the immunoblots were visualized using an Odyssey infrared imaging system (LI-COR Biosciences). Relative amount of protein was determined using the Image Studio Lite Software.
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