2017
DOI: 10.1101/gad.293266.116
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DNA damage signaling mediates the functional antagonism between replicative senescence and terminal muscle differentiation

Abstract: The molecular determinants of muscle progenitor impairment to regenerate aged muscles are currently unclear. We show that, in a mouse model of replicative senescence, decline in muscle satellite cell-mediated regeneration coincides with activation of DNA damage response (DDR) and impaired ability to differentiate into myotubes. Inhibition of DDR restored satellite cell differentiation ability. Moreover, in replicative human senescent fibroblasts, DDR precluded MYOD-mediated activation of the myogenic program. … Show more

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Cited by 29 publications
(21 citation statements)
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“…Lack of expression of dystrophin causes the development of DMD and thus continuous activation of the muscle regenerative program. In our study, spontaneous tumor development occurred in 10% mdx/mTR mice at ~9 months of age (Het to G2), consistent with the low incidence of tumor formation in mdx mice, but with an earlier age of onset, suggesting involvement of disease severity and increased tissue turnover in tumor formation (Chamberlain et al, 2007; Chang et al, 2016; Fernandez et al, 2010; Latella et al, 2017; Sacco et al, 2010). In our study, we employed mice in a C57BL/6 background and compared their tumor phenotype to both C57BL/10 and C57BL/6 × C57BL/10 mixed-background mice utilized in previous studies (Camboni et al, 2012; Fernandez et al, 2010).…”
Section: Discussionsupporting
confidence: 85%
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“…Lack of expression of dystrophin causes the development of DMD and thus continuous activation of the muscle regenerative program. In our study, spontaneous tumor development occurred in 10% mdx/mTR mice at ~9 months of age (Het to G2), consistent with the low incidence of tumor formation in mdx mice, but with an earlier age of onset, suggesting involvement of disease severity and increased tissue turnover in tumor formation (Chamberlain et al, 2007; Chang et al, 2016; Fernandez et al, 2010; Latella et al, 2017; Sacco et al, 2010). In our study, we employed mice in a C57BL/6 background and compared their tumor phenotype to both C57BL/10 and C57BL/6 × C57BL/10 mixed-background mice utilized in previous studies (Camboni et al, 2012; Fernandez et al, 2010).…”
Section: Discussionsupporting
confidence: 85%
“…It has previously been reported that muscular dystrophy activates DNA damage response pathways (Schmidt et al, 2011; Tichy et al, 2017), and we recently showed that MuSCs from mdx/mTR G2 mice accumulate DNA damage when compared to mdx/mTR Het/G1 mice (Latella et al, 2017). Thus, we assessed whether knockout of p53 in mdx/mTR G2 mice could accumulate further DNA damage and whether this could lead to tissue instability, favoring RMS development.…”
Section: Resultsmentioning
confidence: 84%
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“…This exposure to ROS throughout life combined with a decline in their antioxidant capacity during ageing ( Sullivan-Gunn and Lewandowski, 2013 ; Fulle et al, 2005 ) makes geriatric satellite cells particularly vulnerable to accumulation of genomic and mitochondrial DNA mutations, and as a consequence, to mitochondrial dysfunction and genomic instability. Geriatric satellite cells have been shown to have elevated p38α MAP kinase activity ( Cosgrove et al, 2014 ; Bernet et al, 2014 ) and defective autophagy leading to mitochondrial dysfunction, excessive ROS levels ( García-Prat et al, 2016 ), with increased DNA damage ( García-Prat et al, 2016 ; Sinha et al, 2014 ) and senescence ( Sousa-Victor et al, 2014 ; Latella et al, 2017 ). In view of the Pitx2/3 -mutant phenotype ( Figure 7—figure supplement 1 ), and in correlation with observations on hyper-homo-cysteinemic mice ( Veeranki et al, 2015 ), we propose that Pitx2/3 mutants may represent a useful model of premature muscle ageing.…”
Section: Discussionmentioning
confidence: 99%
“…This phenomenon is termed as replicative senescence and is associated with telomere shortening over the course of continuous replication, which can activate DNA damage response (DDR). DDR is characterized by p53‐mediated induction of p21, a protein responsible for cell‐cycle arrest (Hewitt et al, 2012; Fumagalli et al, 2014; Hills and Diffley, 2014; Latella et al, 2017). However, senescence can also be induced prematurely apart from the conventional replicative senescence by various genotoxic stress such as ROS, DNA damage, or by the action of an oncogene such as Myc or Ras (Serrano et al, 1997; Grandori et al, 2003; Campaner et al, 2010).…”
Section: Introductionmentioning
confidence: 99%