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4 protocols using anti β mhc

1

Cardiac Protein Expression Analysis

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Protein was extracted with RIPA lysis buffer (Beyotime Institute of Biotechnology). Total protein was quantified using a Bicinchoninic Acid Assay kit (Beyotime Institute of Biotechnology). A total of 40 µg of protein was used for 10% SDS-PAGE and transferred to PVDF membranes. Subsequently, the membranes were blocked with 5% skim milk at 4°C overnight. The membranes were incubated with the following primary antibodies overnight at 4°C: anti-ANP (1:1,000; cat. no. A14755; ABclonal Biotech Co., Ltd.), anti-NFAT2 (1:1,000; cat. no. A1539; ABclonal Biotech Co., Ltd.), anti-α-actinin (1:1,000; cat. no. sc-17829; Santa Cruz Biotechnology, Inc.), anti-β-MHC (1:1,000; cat. no. A7564; ABclonal Biotech Co., Ltd.), anti-TRPC3 (1:1,000; cat. no. A7742; ABclonal Biotech Co., Ltd.), anti-TRPC6 (1:1,000; cat. no. bs-2393R; BIOSS) and anti-GAPDH (1:2,000; cat. no. AC033; ABclonal Biotech Co., Ltd.). Subsequently, the membranes were incubated with a horseradish peroxidase (HRP) conjugated goat anti-rabbit immunoglobulin (Ig)G secondary antibody (1:5,000; cat. no. bs-0295G-HRP; BIOSS) or HRP-conjugated goat anti-mouse IgG secondary antibody (1:5,000; cat. no. AS003; ABclonal Biotech Co., Ltd.) for 2 h at room temperature. The membranes were detected with Immobilon Western HRP substrate (EMD Millipore). The bands were semi-quantified by ImageJ 2× software (Rawak Software, Inc.).
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2

Quantifying Cardiac Protein Levels

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The myocardial expression levels of α- and β-myosin heavy chain (MHC), Bax, as well as Bcl-2 were detected using immunohistochemistry techniques. Sections (10 μm) from paraffin-embedded tissues were stained using the simplified histostain SP-kit (Zymed Laboratories, USA) according to the manufacturer's instructions. After deparaffinization and rehydration and the inhibition of endogenous peroxidase, the sections were exposed to primary antibodies at 4°C overnight. After incubation with a secondary antibody at room temperature, the sections were incubated in 3,3 N-diaminobenzidine tetrahydrochloride (DAB) and counterstained with hematoxylin. The following primary antibodies were used at a dilution of 1:150: anti-α-MHC, anti-β-MHC, anti-Bax and anti-Bcl-2 (Santa Cruz Biotechnology, CA, USA). The secondary antibody was goat-anti-mouse immunoglobulin conjugated with horseradish peroxidase (dilution of 1:200). Digital images of the stained sections were acquired using a Nikon ECLIPSE E100 microscope with a digital camera system. Unanimity regarding positive immunohistochemical staining in each preparation was reached by two blinded investigators using Image-Pro Plus 5.1 software (Media Cybernetics, Silver Spring, MD).
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Western Blot Analysis of MURC, β-MHC, and BNP

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We used Western blotting to detect protein levels as previously described.12 The antibodies used for the Western blot analysis were anti‐MURC (1:1000 dilution; Sigma‐Aldrich, St. Louis, MO, USA), anti‐β‐MHC (β‐myosin heavy chain) and anti‐BNP (B‐type natriuretic peptide) (1:200 dilution; both from Santa Cruz Biotechnology, Dallas, TX, USA).
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4

Cardiomyocyte Protein Expression Analysis

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Total protein was extracted from cultured neonatal cardiomyocytes and protein concentration was measured using a BCA protein assay kit (Thermo Scientific, USA). Protein samples were separated by 8% or 12% acrylamide denaturing gels (SDS-PAGE) and then transferred to polyvinylidene difluoride (PVDF) membranes. Following transfer, membranes were washed with tris-buffered saline and polysorbate 20 (TBST), and then blocked in 5% skim milk (Gibco, USA) in TBST for 2 h at room temperature, followed by incubation with anti-ANP (1:1000 dilution, Santa Cruz Biotechnology), anti-β-MHC (1:1000 dilution, Santa Cruz Biotechnology), anti-phospho-Smad3 antibody (p-Smad3, 1:1000 dilution, CST), anti-Smad3 antibody (1:1000 dilution, CST) and anti-GADPH (1:10,000 dilution, BOSTER) antibodies on a shaker overnight at 4 °C. The following day, membranes were washed in TBST and then incubated with secondary antibodies (1:8000 dilution, BOSTER) for 2 h at room temperature. Antibody-antigen complexes in all membranes were detected using the Imaging System (GE, Amersham Image 600) and protein bands were quantified by Image Pro Plus 6.0.
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