Journal: Skeletal Muscle
Article Title: Complement-independent pathogenic influences of anti-HMGCR + and anti-SRP + immune-mediated necrotizing myopathy autoantibodies on engineered muscle function
doi: 10.1186/s13395-025-00400-7
Figure Lengend Snippet: IMNM autoantibodies induce hMMT myotube atrophy. A Representative 40x confocal images of myotubes formed in hMMTs within each condition immunostained for sarcomeric α-actinin (SAA, magenta) and counterstained with Hoechst 33,342 (cyan). Scale bar = 50 μm. B Dot plot of hMMT nuclear fusion index for individual hMMTs. C Dot plot of mean SAA positive coverage within flattened confocal stack images for individual hMMTs. D Dot plot of myotube width variation as quantified by the coefficient of variance for single myotubes. n = 146 for (+) and (-) healthy IgG, n = 138 for Ceri, n = 524 for anti-HMGCR, and n = 550 for anti-SRP. E Histogram illustrating myotube diameter frequency across treatment conditions. F Dot plot showing average myotube diameter for individual hMMTs. N = 7 patients for anti-HMGCR + and N = 7 for anti-SRP + IgG treatments. Cerivastatin (Ceri, 75 nM) treatment served as a positive control and no added IgG (-) or Healthy IgG treatment served as negative controls. n = 3 hMMTs per treatment condition. Samples were tested across N = 2 independent experiments which are distinguished in graphs by circle and triangle datapoints. Data for hMMTs treated with total IgGs are binned according to whether they induced a direct contractile effect (DCE; HP2-4 and SP5) or no contractile effect (NCE; HP1, 5–7 and SP1-4, 6, 7) on hMMT force production as indicated by the data in Fig. . All values are reported as means \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\:\pm\:$$\end{document} SEM; * p < 0.05,** p < 0.01, *** p < 0.001, and **** p < 0.0001
Article Snippet: Immortalized 2D myotube after seeding growth media , Skeletal Muscle Cell Basal Medium (Cat. #C-23260, Promo-Cell), 20% FBS, 1% P/S.
Techniques: Positive Control