A signaling hub of insulin receptor, dystrophin glycoprotein complex and plakoglobin regulates muscle size

Yara Eid Mutlak, Dina Aweida, Alexandra Volodin, Bar Ayalon, Nitsan Dahan, Anna Parnis and Shenhav Cohen ()
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Yara Eid Mutlak: Technion Institute of Technology
Dina Aweida: Technion Institute of Technology
Alexandra Volodin: Technion Institute of Technology
Bar Ayalon: Technion Institute of Technology
Nitsan Dahan: Technion Institute of Technology
Anna Parnis: Technion Institute of Technology
Shenhav Cohen: Technion Institute of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-17

Abstract: Abstract Signaling through the insulin receptor governs central physiological functions related to cell growth and metabolism. Here we show by tandem native protein complex purification approach and super-resolution STED microscopy that insulin receptor activity requires association with the fundamental structural module in muscle, the dystrophin glycoprotein complex (DGC), and the desmosomal component plakoglobin (γ-catenin). The integrity of this high-molecular-mass assembly renders skeletal muscle susceptibility to insulin, because DGC-insulin receptor dissociation by plakoglobin downregulation reduces insulin signaling and causes atrophy. Furthermore, low insulin receptor activity in muscles from transgenic or fasted mice decreases plakoglobin-DGC-insulin receptor content on the plasma membrane, but not when plakoglobin is overexpressed. By masking β-dystroglycan LIR domains, plakoglobin prevents autophagic clearance of plakoglobin-DGC-insulin receptor co-assemblies and maintains their function. Our findings establish DGC as a signaling hub, and provide a possible mechanism for the insulin resistance in Duchenne Muscular Dystrophy, and for the cardiomyopathies seen with plakoglobin mutations.

Date: 2020
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DOI: 10.1038/s41467-020-14895-9

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