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Long non-coding RNA MALAT1 enhances the apoptosis of cardiomyocytes through autophagy inhibition by regulating TSC2-mTOR signaling
Hu, Hao; Wu, Jiawei; Yu, Xiaofan; Zhou, Junling; Yu, Hua; Ma, Likun.
  • Hu, Hao; University of Science and Technology of China. Division of Life Sciences and Medicine. The First Affiliated Hospital of USTC. Hefei. CN
  • Wu, Jiawei; University of Science and Technology of China. Division of Life Sciences and Medicine. The First Affiliated Hospital of USTC. Hefei. CN
  • Yu, Xiaofan; University of Science and Technology of China. Division of Life Sciences and Medicine. The First Affiliated Hospital of USTC. Hefei. CN
  • Zhou, Junling; University of Science and Technology of China. Division of Life Sciences and Medicine. The First Affiliated Hospital of USTC. Hefei. CN
  • Yu, Hua; University of Science and Technology of China. Division of Life Sciences and Medicine. The First Affiliated Hospital of USTC. Hefei. CN
  • Ma, Likun; University of Science and Technology of China. Division of Life Sciences and Medicine. The First Affiliated Hospital of USTC. Hefei. CN
Biol. Res ; 52: 58, 2019. graf
Article in English | LILACS | ID: biblio-1100910
ABSTRACT

BACKGROUND:

Our previous study showed that knockdown of long noncoding RNA (lncRNA) metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) attenuated myocardial apoptosis in mouse acute myocardial infarction (AMI). This study aims to explore whether MALAT1 enhanced cardiomyocyte apoptosis via autophagy regulation and the underlying mechanisms of MALAT1 regulating autophagy.

METHODS:

Cardiomyocytes were isolated from neonatal mice and then stimulated with hypoxia/reoxygenation (H/R) injury to mimic AMI. The autophagy level was assessed using GFP-LC3 immunofluorescence and western blot analysis of autophagy-related proteins. RNA pull-down and RNA immunoprecipitation (RIP) was performed to analyze the binding of MALAT1 and EZH2. Chromatin immunoprecipitation (ChIP) assay was performed to analyze the binding of TSC2 promoter and EZH2. The cell apoptosis was evaluated using TUNEL staining and western blot analysis of apoptosis-related proteins.

RESULTS:

H/R injury increased MALAT1 expression in cardiomyocytes. Furthermore, MALAT1 overexpression inhibited, whereas MALAT1 knockdown enhanced the autophagy of cardiomyocytes. Moreover, MALAT1 overexpression recruited EZH2 to TSC2 promoter regions to elevate H3K27me3 and epigenetically inhibited TSC2 transcription. Importantly, TSC2 overexpression suppressed mTOR signaling and then activated the autophagy. Further results showed that MALAT1 inhibited proliferation and enhanced apoptosis of cardiomyocytes through inhibiting TSC2 and autophagy.

CONCLUSION:

These findings demonstrate that the increased MALAT1 expression induced by H/R injury enhances cardiomyocyte apoptosis through autophagy inhibition by regulating TSC2-mTOR signaling.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Autophagy / Apoptosis / Myocytes, Cardiac / TOR Serine-Threonine Kinases / RNA, Long Noncoding / Tuberous Sclerosis Complex 2 Protein Limits: Animals Language: English Journal: Biol. Res Journal subject: Biology Year: 2019 Type: Article Affiliation country: China Institution/Affiliation country: University of Science and Technology of China/CN

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Full text: Available Index: LILACS (Americas) Main subject: Autophagy / Apoptosis / Myocytes, Cardiac / TOR Serine-Threonine Kinases / RNA, Long Noncoding / Tuberous Sclerosis Complex 2 Protein Limits: Animals Language: English Journal: Biol. Res Journal subject: Biology Year: 2019 Type: Article Affiliation country: China Institution/Affiliation country: University of Science and Technology of China/CN