Abstract：
:Mitochondria-generated reactive oxygen species (mROS) are frequently associated with DNA damage and cell cycle arrest, but physiological increases in mROS serve to regulate specific cell functions. T3 is a major regulator of mROS, including hydrogen peroxide (H2O2). Here we show that exogenous thyroid hormone (T3) administration increases cardiomyocyte numbers in neonatal murine hearts. The mechanism involves signaling by mitochondria-generated H2O2 (mH2O2) acting via the redox sensor, peroxiredoxin-1, a thiol peroxidase with high reactivity towards H2O2 that activates c-Jun N-terminal kinase-2α2 (JNK2α2). JNK2α2, a relatively rare member of the JNK family of mitogen-activated protein kinases (MAPK), phosphorylates c-Jun, a component of the activator protein 1 (AP-1) early response transcription factor, resulting in enhanced insulin-like growth factor 1 (IGF-1) expression and activation of proliferative ERK1/2 signaling. This non-canonical mechanism of MAPK activation couples T3 actions on mitochondria to cell cycle activation. Although T3 is regarded as a maturation factor for cardiomyocytes, these studies identify a novel redox pathway that is permissive for T3-mediated cardiomyocyte proliferation-this because of the expression of a pro-proliferative JNK isoform that results in growth factor elaboration and ERK1/2 cell cycle activation.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Tan L,Bogush N,Naib H,Perry J,Calvert JW,Martin DIK,Graham RM,Naqvi N,Husain Adoi
10.1038/s41598-019-53705-1subject
Has Abstractpub_date
2019-11-27 00:00:00pages
17731issue
1issn
2045-2322pii
10.1038/s41598-019-53705-1journal_volume
9pub_type
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