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Mir-34 and cardiomyocytes

Robin Verjans, Marc van Bilsen, Blanche Schroen
The prevalence of age-related diseases is increasing dramatically, among which cardiac disease represents the leading cause of death. Aging of the heart is characterized by various molecular and cellular hallmarks impairing both cardiomyocytes and noncardiomyocytes, and resulting in functional deteriorations of the cardiac system. The aging process includes desensitization of β-adrenergic receptor (βAR)-signaling and decreased calcium handling, altered growth signaling and cardiac hypertrophy, mitochondrial dysfunction and impaired autophagy, increased programmed cell death, low-grade inflammation of noncanonical inflammatory cells, and increased ECM deposition...
2017: International Review of Cell and Molecular Biology
Zai-Cun Wang, Zun-Zhe Wang, Huan-Ju Ma, Chen-Chen Wang, Hua-Ting Wang
Ischemic injury in the heart is associated with death of cardiomyocytes and even after decades of research there is no appropriate therapeutic intervention to treat ischemic injury. The microRNA miR-34a is known to be induced in cardiomyocytes following ischemic injury. Another hallmark of ischemic injury is impaired glycolysis. The objective of the current study was to investigate the effects of short- and long-term exposure to hypoxia on miR-34a expression on apoptosis and regulation of key glycolysis metabolic enzymes...
April 6, 2018: Biochemical and Biophysical Research Communications
Drew M Nassal, Xiaoping Wan, Haiyan Liu, Danielle Maleski, Angelina Ramirez-Navarro, Christine S Moravec, Eckhard Ficker, Kenneth R Laurita, Isabelle Deschênes
Arrhythmogenesis from aberrant electrical remodeling is a primary cause of death among patients with heart disease. Amongst a multitude of remodeling events, reduced expression of the ion channel subunit KChIP2 is consistently observed in numerous cardiac pathologies. However, it remains unknown if KChIP2 loss is merely a symptom or involved in disease development. Using rat and human derived cardiomyocytes, we identify a previously unobserved transcriptional capacity for cardiac KChIP2 critical in maintaining electrical stability...
March 6, 2017: ELife
Romina D'Aurizio, Francesco Russo, Elena Chiavacci, Mario Baumgart, Marco Groth, Mara D'Onofrio, Ivan Arisi, Giuseppe Rainaldi, Letizia Pitto, Marco Pellegrini
MicroRNAs (miRNAs) are small non-coding RNAs that play an important role in the post-transcriptional regulation of gene expression. miRNAs are involved in the regulation of many biological processes such as differentiation, apoptosis, and cell proliferation. miRNAs are expressed in embryonic, postnatal, and adult hearts, and they have a key role in the regulation of gene expression during cardiovascular development and disease. Aberrant expression of miRNAs is associated with abnormal cardiac cell differentiation and dysfunction...
2016: Frontiers in Bioengineering and Biotechnology
Weizao Guo, Huichen Liu, Lin Li, Man Yang, Aihua Du
BACKGROUND: Advances in the understanding of cardiovascular pathogenesis have highlighted that inflammation plays a central role in atherosclerotic coronary heart disease. Therefore, exploring pharmacologically based anti-inflammatory treatments to be used in cardiovascular therapeutics is worthwhile to promote the discovery of novel ways of treating cardiovascular disorders. METHODS: The myocardial cell line H9c2(2-1) was exposed to lipopolysaccharide (LPS) in culture and resulted in a cellular pro-inflammation status...
2014: Chinese Medical Journal
Arkady Rutkovskiy, Marte Bliksøen, Vigdis Hillestad, Mubashar Amin, Gabor Czibik, Guro Valen, Jarle Vaage, Mahmood Amiry-Moghaddam, Kåre-Olav Stensløkken
Aquaporin-1 (AQP1) is expressed in human and mouse hearts, but little is known about its cellular and subcellular localization and regulation. The aim of this study was to investigate the localization of AQP1 in the mouse heart and to determine the effects of ischemia and hypoxia on its expression. Mouse myocardial cells were freshly isolated and split into cardiomyocyte and non-cardiomyocyte fractions. Isolated, Langendorff-perfused C57Bl6 mouse hearts (n=46) were harvested with no intervention, subjected to 35min of ischemia or ischemia followed by 60min of reperfusion...
March 2013: Journal of Molecular and Cellular Cardiology
Sushma Reddy, Mingming Zhao, Dong-Qing Hu, Giovanni Fajardo, Shijun Hu, Zhumur Ghosh, Viswanathan Rajagopalan, Joseph C Wu, Daniel Bernstein
MicroRNAs (miRs) are small, noncoding RNAs that are emerging as crucial regulators of cardiac remodeling in left ventricular hypertrophy (LVH) and failure (LVF). However, there are no data on their role in right ventricular hypertrophy (RVH) and failure (RVF). This is a critical question given that the RV is uniquely at risk in patients with congenital right-sided obstructive lesions and in those with systemic RVs. We have developed a murine model of RVH and RVF using pulmonary artery constriction (PAC). miR microarray analysis of RV from PAC vs...
May 1, 2012: Physiological Genomics
Kazuma Iekushi, Florian Seeger, Birgit Assmus, Andreas M Zeiher, Stefanie Dimmeler
BACKGROUND: Cell therapy with bone marrow-derived mononuclear cells (BMCs) can improve recovery of cardiac function after ischemia; however, the molecular mechanisms are not yet fully understood. MicroRNAs (miRNAs) are key regulators of gene expression and modulate the pathophysiology of cardiovascular diseases. METHODS AND RESULTS: We demonstrated that intramyocardial delivery of BMCs in infarcted mice regulates the expression of cardiac miRNAs and significantly downregulates the proapoptotic miR-34a...
April 10, 2012: Circulation
Sarah U Morton, Paul J Scherz, Kimberly R Cordes, Kathryn N Ivey, Didier Y R Stainier, Deepak Srivastava
Organ patterning during embryonic development requires precise temporal and spatial regulation of protein activity. microRNAs (miRNAs), small noncoding RNAs that typically inhibit protein expression, are broadly important for proper development, but their individual functions during organogenesis are largely unknown. We report that miR-138 is expressed in specific domains in the zebrafish heart and is required to establish appropriate chamber-specific gene expression patterns. Disruption of miR-138 function led to ventricular expansion of gene expression normally restricted to the atrio-ventricular valve region and, ultimately, to disrupted ventricular cardiomyocyte morphology and cardiac function...
November 18, 2008: Proceedings of the National Academy of Sciences of the United States of America
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