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Cytoskeletal disorganization underlies PABPN1-mediated myogenic disability.

Abstract：

:Muscle wasting and atrophy are regulated by multiple molecular processes, including mRNA processing. Reduced levels of the polyadenylation binding protein nucleus 1 (PABPN1), a multifactorial regulator of mRNA processing, cause muscle atrophy. A proteomic study in muscles with reduced PABPN1 levels suggested dysregulation of sarcomeric and cytoskeletal proteins. Here we investigated the hypothesis that reduced PABPN1 levels lead to an aberrant organization of the cytoskeleton. MURC, a plasma membrane-associated protein, was found to be more abundant in muscles with reduced PABPN1 levels, and it was found to be expressed at regions showing regeneration. A polarized cytoskeletal organization is typical for muscle cells, but muscle cells with reduced PABPN1 levels (named as shPAB) were characterized by a disorganized cytoskeleton that lacked polarization. Moreover, cell mechanical features and myogenic differentiation were significantly reduced in shPAB cells. Importantly, restoring cytoskeletal stability, by actin overexpression, was beneficial for myogenesis, expression of sarcomeric proteins and proper localization of MURC in shPAB cell cultures and in shPAB muscle bundle. We suggest that poor cytoskeletal mechanical features are caused by altered expression levels of cytoskeletal proteins and contribute to muscle wasting and atrophy.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Olie CS,van der Wal E,Domagoj C,Maton L,de Greef JC,Lin IH,Chen YF,Kareem E,Penninger JM,Kessler BM,Raz V

doi

10.1038/s41598-020-74676-8

subject

Has Abstract

pub_date

2020-10-19 00:00:00

pages

17621

issue

1

issn

2045-2322

pii

10.1038/s41598-020-74676-8

journal_volume

10

pub_type

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