Autophagy induction in atrophic muscle cells requires ULK1 activation by TRIM32 through unanchored K63-linked polyubiquitin chains

M. Di Rienzo, M. Antonioli, C. Fusco, Yuangang Liu, M. Mari, I. Orhon, G. Refolo, F. Germani, M. Corazzari, A. Romagnoli, F. Ciccosanti, B. Mandriani, M. T. Pellico, R. De La Torre, H. Ding, M. Dentice, M. Neri, A. Ferlini, F. Reggiori, Molly Kulesz-Martin & 3 others M. Piacentini, G. Merla, G. M. Fimia

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Optimal autophagic activity is crucial to maintain muscle integrity, with either reduced or excessive levels leading to specific myopathies. LGMD2H is a muscle dystrophy caused by mutations in the ubiquitin ligase TRIM32, whose function in muscles remains not fully understood. Here, we show that TRIM32 is required for the induction of muscle autophagy in atrophic conditions using both in vitro and in vivo mouse models. Trim32 inhibition results in a defective autophagy response to muscle atrophy, associated with increased ROS and MuRF1 levels. The proautophagic function of TRIM32 relies on its ability to bind the autophagy proteins AMBRA1 and ULK1 and stimulate ULK1 activity via unanchored K63-linked polyubiquitin. LGMD2H-causative mutations impair TRIM32's ability to bind ULK1 and induce autophagy. Collectively, our study revealed a role for TRIM32 in the regulation of muscle autophagy in response to atrophic stimuli, uncovering a previously unidentified mechanism by which ubiquitin ligases activate autophagy regulators.

Original languageEnglish (US)
Article numbereaau8857
JournalScience Advances
Volume5
Issue number5
DOIs
StatePublished - Jan 1 2019

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muscle cells
muscles
induction
activation
mutations
atrophy
regulators
stimuli
integrity
mice
proteins

ASJC Scopus subject areas

  • General
  • Physics and Astronomy (miscellaneous)

Cite this

Autophagy induction in atrophic muscle cells requires ULK1 activation by TRIM32 through unanchored K63-linked polyubiquitin chains. / Di Rienzo, M.; Antonioli, M.; Fusco, C.; Liu, Yuangang; Mari, M.; Orhon, I.; Refolo, G.; Germani, F.; Corazzari, M.; Romagnoli, A.; Ciccosanti, F.; Mandriani, B.; Pellico, M. T.; De La Torre, R.; Ding, H.; Dentice, M.; Neri, M.; Ferlini, A.; Reggiori, F.; Kulesz-Martin, Molly; Piacentini, M.; Merla, G.; Fimia, G. M.

In: Science Advances, Vol. 5, No. 5, eaau8857, 01.01.2019.

Research output: Contribution to journalArticle

Di Rienzo, M, Antonioli, M, Fusco, C, Liu, Y, Mari, M, Orhon, I, Refolo, G, Germani, F, Corazzari, M, Romagnoli, A, Ciccosanti, F, Mandriani, B, Pellico, MT, De La Torre, R, Ding, H, Dentice, M, Neri, M, Ferlini, A, Reggiori, F, Kulesz-Martin, M, Piacentini, M, Merla, G & Fimia, GM 2019, 'Autophagy induction in atrophic muscle cells requires ULK1 activation by TRIM32 through unanchored K63-linked polyubiquitin chains', Science Advances, vol. 5, no. 5, eaau8857. https://doi.org/10.1126/sciadv.aau8857
Di Rienzo, M. ; Antonioli, M. ; Fusco, C. ; Liu, Yuangang ; Mari, M. ; Orhon, I. ; Refolo, G. ; Germani, F. ; Corazzari, M. ; Romagnoli, A. ; Ciccosanti, F. ; Mandriani, B. ; Pellico, M. T. ; De La Torre, R. ; Ding, H. ; Dentice, M. ; Neri, M. ; Ferlini, A. ; Reggiori, F. ; Kulesz-Martin, Molly ; Piacentini, M. ; Merla, G. ; Fimia, G. M. / Autophagy induction in atrophic muscle cells requires ULK1 activation by TRIM32 through unanchored K63-linked polyubiquitin chains. In: Science Advances. 2019 ; Vol. 5, No. 5.
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abstract = "Optimal autophagic activity is crucial to maintain muscle integrity, with either reduced or excessive levels leading to specific myopathies. LGMD2H is a muscle dystrophy caused by mutations in the ubiquitin ligase TRIM32, whose function in muscles remains not fully understood. Here, we show that TRIM32 is required for the induction of muscle autophagy in atrophic conditions using both in vitro and in vivo mouse models. Trim32 inhibition results in a defective autophagy response to muscle atrophy, associated with increased ROS and MuRF1 levels. The proautophagic function of TRIM32 relies on its ability to bind the autophagy proteins AMBRA1 and ULK1 and stimulate ULK1 activity via unanchored K63-linked polyubiquitin. LGMD2H-causative mutations impair TRIM32's ability to bind ULK1 and induce autophagy. Collectively, our study revealed a role for TRIM32 in the regulation of muscle autophagy in response to atrophic stimuli, uncovering a previously unidentified mechanism by which ubiquitin ligases activate autophagy regulators.",
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AU - Liu, Yuangang

AU - Mari, M.

AU - Orhon, I.

AU - Refolo, G.

AU - Germani, F.

AU - Corazzari, M.

AU - Romagnoli, A.

AU - Ciccosanti, F.

AU - Mandriani, B.

AU - Pellico, M. T.

AU - De La Torre, R.

AU - Ding, H.

AU - Dentice, M.

AU - Neri, M.

AU - Ferlini, A.

AU - Reggiori, F.

AU - Kulesz-Martin, Molly

AU - Piacentini, M.

AU - Merla, G.

AU - Fimia, G. M.

PY - 2019/1/1

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N2 - Optimal autophagic activity is crucial to maintain muscle integrity, with either reduced or excessive levels leading to specific myopathies. LGMD2H is a muscle dystrophy caused by mutations in the ubiquitin ligase TRIM32, whose function in muscles remains not fully understood. Here, we show that TRIM32 is required for the induction of muscle autophagy in atrophic conditions using both in vitro and in vivo mouse models. Trim32 inhibition results in a defective autophagy response to muscle atrophy, associated with increased ROS and MuRF1 levels. The proautophagic function of TRIM32 relies on its ability to bind the autophagy proteins AMBRA1 and ULK1 and stimulate ULK1 activity via unanchored K63-linked polyubiquitin. LGMD2H-causative mutations impair TRIM32's ability to bind ULK1 and induce autophagy. Collectively, our study revealed a role for TRIM32 in the regulation of muscle autophagy in response to atrophic stimuli, uncovering a previously unidentified mechanism by which ubiquitin ligases activate autophagy regulators.

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