Remya Sreedhar1, Somasundaram Arumugam1, Rajarajan A Thandavarayan2, Vijayasree V Giridharan3, Vengadeshprabhu Karuppagounder1, Vigneshwaran Pitchaimani1, Rejina Afrin1, Meilei Harima1, Masahiko Nakamura4, Kenji Suzuki5, Narasimman Gurusamy6, Prasanna Krishnamurthy7, Kenichi Watanabe8. 1. Department of Clinical Pharmacology, Niigata University of Pharmacy and Applied Life Sciences, Niigata 956 8603, Japan. 2. Department of Clinical Pharmacology, Niigata University of Pharmacy and Applied Life Sciences, Niigata 956 8603, Japan; Department of Cardiovascular Sciences, Houston Methodist Research Center, Houston 77087, TX, USA. 3. J.K.K. Nattraja College of Pharmacy, Natarajapuram, Komarapalayam 638183, Namakkal District, Tamil Nadu, India. 4. Department of Cardiology, Yamanashi Prefectural Central Hospital, 1-1-1 Fujimi, Kofu, Yamanashi 400 8506, Japan. 5. Department of Gastroenterology, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951 8510, Japan. 6. Department of Pharmacology, College of Pharmacy, King Khalid University, Abha, Saudi Arabia. 7. Department of Cardiovascular Sciences, Houston Methodist Research Center, Houston 77087, TX, USA. 8. Department of Clinical Pharmacology, Niigata University of Pharmacy and Applied Life Sciences, Niigata 956 8603, Japan. Electronic address: somasundaram143@gmail.com.
Abstract
BACKGROUND/ OBJECTIVES: 14-3-3η protein, a dimeric phosphoserine-binding protein, provides protection against adverse cardiac remodeling during pressure-overload induced heart failure in mice. To identify its role in myocardial infarction (MI), we have used mice with cardio-specific expression of dominant-negative 14-3-3η protein mutant (DN14-3-3) and performed the surgical ligation of left anterior descending coronary artery. METHODS: We have performed echocardiography to assess cardiac function, protein expression analysis using Western blotting, mRNA expression by real time-reverse transcription polymerase chain reaction and histopathological analyses. RESULTS: DN14-3-3 mice with MI displayed reduced survival, left ventricular ejection fraction and fractional shortening. Interestingly, DN14-3-3 mice subjected to MI showed increased cardiac hypertrophy, inflammation, fibrosis and apoptosis as compared to their wild-type counterparts. Mechanistically, DN14-3-3 mice with MI exhibited activation of endoplasmic reticulum (ER) stress and markers of maladaptive cardiac remodeling. Cardiac regeneration marker expression also decreased drastically in the DN14-3-3 mice with MI. CONCLUSION: Depletion of the 14-3-3η protein causes cardiac dysfunction and reduces survival in mice with MI, probably via exacerbation of ER stress and death signaling pathways and suppression of cardiac regeneration. Thus, identification of drugs that can modulate cardiac 14-3-3η protein levels may probably provide a novel protective therapy for heart failure.
BACKGROUND/ OBJECTIVES: 14-3-3η protein, a dimeric phosphoserine-binding protein, provides protection against adverse cardiac remodeling during pressure-overload induced heart failure in mice. To identify its role in myocardial infarction (MI), we have used mice with cardio-specific expression of dominant-negative 14-3-3η protein mutant (DN14-3-3) and performed the surgical ligation of left anterior descending coronary artery. METHODS: We have performed echocardiography to assess cardiac function, protein expression analysis using Western blotting, mRNA expression by real time-reverse transcription polymerase chain reaction and histopathological analyses. RESULTS: DN14-3-3 mice with MI displayed reduced survival, left ventricular ejection fraction and fractional shortening. Interestingly, DN14-3-3 mice subjected to MI showed increased cardiac hypertrophy, inflammation, fibrosis and apoptosis as compared to their wild-type counterparts. Mechanistically, DN14-3-3 mice with MI exhibited activation of endoplasmic reticulum (ER) stress and markers of maladaptive cardiac remodeling. Cardiac regeneration marker expression also decreased drastically in the DN14-3-3 mice with MI. CONCLUSION: Depletion of the 14-3-3η protein causes cardiac dysfunction and reduces survival in mice with MI, probably via exacerbation of ER stress and death signaling pathways and suppression of cardiac regeneration. Thus, identification of drugs that can modulate cardiac 14-3-3η protein levels may probably provide a novel protective therapy for heart failure.
Authors: Lindice M Nisimura; Laura L Coelho; Tatiana G de Melo; Paloma de Carvalho Vieira; Pedro H Victorino; Luciana R Garzoni; David C Spray; Dumitru A Iacobas; Sanda Iacobas; Herbert B Tanowitz; Daniel Adesse Journal: Front Cell Infect Microbiol Date: 2020-06-17 Impact factor: 5.293