Muscle stem cells build a Fibrillin-1 matrix that keeps them quiescent
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A study in Science Advances shows that muscle stem cells produce their own protective extracellular matrix: Fibrillin-1 (FBN1), a Notch-regulated glycoprotein, prevents the cells from activating prematurely. Deleting Fbn1 in muscle stem cells produces dose-dependent quiescence defects, loss of cellular projections, depletion of the stem cell pool and progressive muscle decline. Biopsies from Marfan syndrome patients show abnormally activated satellite cells, consistent with a role for this pathway in MFS myopathy. Mechanistically, blocking TGFβ rescues the defects seen in FBN1-deficient muscle, tying excess TGFβ signaling to the stem cell dysfunction. The work positions matrix-mediated TGFβ control as a potential therapeutic angle for Marfan-related muscle disease, though no clinical translation has yet been tested.
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- Sci AdvPickMuscle stem cells produce a protective Fibrillin-1 matrix to prevent precocious activation.
Fibrillin-1 (FBN1), a Notch-regulated matrix glycoprotein made by muscle stem cells themselves, is required to keep those cells quiescent. Deleting Fbn1 in muscle stem cells causes dose-dependent quiescence defects, loss of cellular projections, depletion of the stem cell pool, and progressive muscle decline, while human Marfan syndrome biopsies show abnormally activated satellite cells. TGFβ blockade rescues the defects of FBN1-deficient muscle, linking excess TGFβ signaling to stem cell dysfunction in MFS myopathy.
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