Read by QxMD icon Read

Cardiac RNA decay

Junwei Nie, Mingyang Jiang, Xiaotian Zhang, Hao Tang, Hengwei Jin, Xinyi Huang, Baiyin Yuan, Chenxi Zhang, Janice Ching Lai, Yoshikuni Nagamine, Dejing Pan, Wengong Wang, Zhongzhou Yang
RNA G-quadruplexes (G4s) play important roles in RNA biology. However, the function and regulation of mRNA G-quadruplexes in embryonic development remain elusive. Previously, we identified RHAU (DHX36, G4R1) as an RNA helicase that resolves mRNA G-quadruplexes. Here, we find that cardiac deletion of Rhau leads to heart defects and embryonic lethality in mice. Gene expression profiling identified Nkx2-5 mRNA as a target of RHAU that associates with its 5' and 3' UTRs and modulates its stability and translation...
October 27, 2015: Cell Reports
Sudhish Mishra, Vitaliy Reznikov, Victor A Maltsev, Nidas A Undrovinas, Hani N Sabbah, Albertas Undrovinas
KEY POINTS: Late Na(+) current (INaL) contributes to action potential remodelling and Ca(2+)/Na(+) changes in heart failure. The molecular identity of INaL remains unclear. The contributions of different Na(+) channel isoforms, apart from the cardiac isoform, remain unknown. We discovered and characterized a substantial contribution of neuronal isoform Nav1.1 to INaL. This new component is physiologically relevant to the control of action potential shape and duration, as well as to cell Ca(2+) dynamics, especially in heart failure...
March 15, 2015: Journal of Physiology
Sudhish Mishra, Vitaliy Reznikov, Victor A Maltsev, Nidas A Undrovinas, Hani N Sabbah, Albertas Undrovinas
Late Na(+) current (INaL) contributes to action potential (AP) duration and Ca(2+) handling in cardiac cells. Augmented INaL was implicated in delayed repolarization and impaired Ca(2+) handling in heart failure (HF). We tested if Na(+) channel (Nav's) neuronal isoforms contribute to INaL and Ca(2+) cycling defects in HF in 17 dogs with HF achieved via sequential coronary artery embolizations. Six normal dogs served as control. Transient Na(+) current (INaT) and INaL in left ventricular cardiomyocytes (VCMs) were recorded by patch-clamp while Ca(2+) dynamics was monitored using fluo-4...
October 17, 2014: Journal of Physiology
Karni S Moshal, Zhe Zhang, Karim Roder, Tae Yun Kim, Leroy Cooper, Bogdan Patedakis Litvinov, Yichun Lu, Vishal Reddy, Dmitry Terentyev, Bum-Rak Choi, Gideon Koren
We recently showed that progesterone treatment abolished arrhythmias and sudden cardiac death in a transgenic rabbit model of long QT syndrome type 2 (LQT2). Moreover, levels of cardiac sarco(endo)plasmic reticulum Ca(2+)-ATPase type 2a (SERCA2a) were upregulated in LQT2 heart extracts. We hypothesized that progesterone treatment upregulated SERCA2a expression, thereby reducing Ca(2+)-dependent arrhythmias in LQT2 rabbits. We therefore investigated the effect of progesterone on SERCA2a regulation in isolated cardiomyocytes...
December 1, 2014: American Journal of Physiology. Cell Physiology
Andrew Nickless, Erin Jackson, Jayne Marasa, Patrick Nugent, Robert W Mercer, David Piwnica-Worms, Zhongsheng You
The nonsense-mediated mRNA decay (NMD) pathway selectively eliminates aberrant transcripts containing premature translation termination codons and regulates the levels of a number of physiological mRNAs. NMD modulates the clinical outcome of a variety of human diseases, including cancer and many genetic disorders, and may represent a target for therapeutic intervention. Here, we have developed a new multicolored bioluminescence-based reporter system that can specifically and effectively assay NMD in live human cells...
August 2014: Nature Medicine
Leena Kaikkonen, Johanna Magga, Veli-Pekka Ronkainen, Elina Koivisto, Ábel Perjes, J Kurt Chuprun, Leif Erik Vinge, Teemu Kilpiö, Jani Aro, Johanna Ulvila, Tarja Alakoski, James A Bibb, Istvan Szokodi, Walter J Koch, Heikki Ruskoaho, Risto Kerkelä
cAMP-dependent protein kinase (PKA) regulates the L-type calcium channel, the ryanodine receptor, and phospholamban (PLB) thereby increasing inotropy. Cardiac contractility is also regulated by p38 MAPK, which is a negative regulator of cardiac contractile function. The aim of this study was to identify the mechanism mediating the positive inotropic effect of p38 inhibition. Isolated adult and neonatal cardiomyocytes and perfused rat hearts were utilized to investigate the molecular mechanisms regulated by p38...
February 2014: Journal of Molecular and Cellular Cardiology
Megumi Fukuyama, Seiko Ohno, Qi Wang, Takeshi Shirayama, Hideki Itoh, Minoru Horie
BACKGROUND: Brugada syndrome (BrS) is an inherited cardiac arrhythmia associated with sudden death due to ventricular fibrillation. Mutations in genes related to the cardiac L-type calcium channel have been reported to be causative of BrS. Generally, the messenger RNA (mRNA) that contains a nonsense mutation is rapidly degraded via its decay pathway, which is known as nonsense-mediated mRNA decay (NMD). Previously, we reported a male patient with BrS who carried c.1896G>A (the first nucleotide of CACNA1C exon 14), which caused a synonymous mutation, p...
April 2014: Heart Rhythm: the Official Journal of the Heart Rhythm Society
Meghan C Drummond, Karen H Friderici
Cytoplasmic actins are abundant, ubiquitous proteins in nucleated cells. However, actin expression is regulated in a tissue- and development-specific manner. We identified a novel cytoplasmic-γ-actin (Actg1) transcript that includes a previously unidentified exon (3a). Inclusion of this exon introduces an in-frame termination codon. We hypothesized this alternatively-spliced transcript down-regulates γ-actin production by targeting these transcripts for nonsense-mediated decay (NMD). To address this, we investigated conservation between mammals, tissue-specificity in mice, and developmental regulation using C2C12 cell culture...
2013: PLoS Genetics
Machender R Kandadi, Nan Hu, Jun Ren
This study was designed to evaluate the role of ULK1 in AMPK-mediated myocardial autophagy and contractile dysfunction following acute alcohol challenge. Wild-type and AMPK knockout mice were challenged with ethanol (3 g/kg/d, i.p.) for 3 days. Myocardial function was evaluated using echocardiography and edge-detection. Western blot analysis was employed to evaluate the levels of AMPK, Raptor, mTOR, the AMPK downstream signal ULK1 and autophagy markers Beclin-1 and LC3-II. siRNA was used to knockdown ULK1 in H9C2 myoblasts...
2013: Current Pharmaceutical Design
Elizabeth J F White, Gary Brewer, Gerald M Wilson
AUF1 is a family of four proteins generated by alternative pre-mRNA splicing that form high affinity complexes with AU-rich, mRNA-destabilizing sequences located within the 3' untranslated regions of many labile mRNAs. While AUF1 binding is most frequently associated with accelerated mRNA decay, emerging examples have demonstrated roles as a mRNA stabilizer or even translational regulator for specific transcripts. In this review, we summarize recent advances in our understanding of mRNA recognition by AUF1 and the biochemical and functional consequences of these interactions...
June 2013: Biochimica et Biophysica Acta
Matthew R Stump, Qiuming Gong, Jonathan D Packer, Zhengfeng Zhou
Mutations in the human ether-a-go-go-related gene (hERG) result in long QT syndrome type 2 (LQT2). The hERG gene encodes a K(+) channel that contributes to the repolarization of the cardiac action potential. We have previously shown that hERG mRNA transcripts that contain premature termination codon mutations are rapidly degraded by nonsense-mediated mRNA decay (NMD). In this study, we identified a LQT2 nonsense mutation, Q81X, which escapes degradation by the reinitiation of translation and generates N-terminally truncated channels...
November 2012: Journal of Molecular and Cellular Cardiology
Donna D'souza, Ruanne Y J Lai, Michael Shuen, David A Hood
A change in mRNA stability alters the abundance of mRNA available for translation and is emerging as a critical pathway influencing gene expression. Variations in the stability of functional and regulatory mitochondrial proteins may contribute to the divergent mitochondrial densities observed in striated muscle. Thus we hypothesized that the stability of mRNAs encoding for regulatory nuclear and mitochondrial transcription factors would be inversely proportional to muscle oxidative capacity and would be facilitated by the activity of RNA binding proteins (RBPs)...
August 15, 2012: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Tiesuo Han, Wenqi He, Deguang Song, Kui Zhao, Chenchen Wu, Feng Gao, Huijun Lu, Xianying Gai, Xinrui Wang, Fei Li, Cuicui Ji, Xijuan Lin
OBJECTIVE: To evaluate the pathogenicity of SSM-CVB3 in a macaque model. METHODS: The clinical symptoms of macaques were recorded; hematological, biochemical and histopathological evaluations were completed; viral titers and neutralization titers (NT-titers) in sera were tested; and the mRNA levels of SSM-CVB3, coxsackievirus and adenovirus receptor (CAR) and decay accelerating factor (DAF) were determined. RESULTS: After SSM-CVB3 infection, the macaques showed a lack of activity, a poor appetite, a higher body temperature, and severe diarrhea...
February 2012: Experimental and Molecular Pathology
Johannes L Bjørnstad, Biljana Skrbic, Henriette S Marstein, Almira Hasic, Ivar Sjaastad, William E Louch, Geir Florholmen, Geir Christensen, Theis Tønnessen
AIMS: Left ventricular (LV) pressure overload leads to myocardial remodelling and reduced cardiac function. Both cardioprotective and deleterious effects have been attributed to SMAD2/3 (SMAD, small mothers against decapentaplegic) signalling, but the role of these important molecules in pressure overload remains unclear. The aim of this study was to examine the effects of SMAD2 inhibition on cardiac function and remodelling in mice subjected to aortic banding (AB), using a small molecule inhibitor (SM16) of SMAD2 signalling...
January 1, 2012: Cardiovascular Research
F C Howarth, M A Qureshi, Z Hassan, D Isaev, K Parekh, A John, M Oz, H Raza, E Adeghate, T E Adrian
There has been a spectacular rise in the global prevalence of type 2 diabetes mellitus and cardiovascular complications are the major cause of morbidity and mortality in diabetic patients. The objective of the study was to investigate ventricular myocyte shortening, intracellular Ca(2+) signalling and expression of genes encoding cardiac muscle proteins in the aged Zucker diabetic fatty (ZDF) rat. There was a fourfold elevation in non-fasting blood glucose in ZDF rats (478.43 ± 29.22 mg/dl) compared to controls (108...
February 2012: Molecular and Cellular Biochemistry
Changwon Kho, Ahyoung Lee, Dongtak Jeong, Jae Gyun Oh, Antoine H Chaanine, Eddy Kizana, Woo Jin Park, Roger J Hajjar
The calcium-transporting ATPase ATP2A2, also known as SERCA2a, is a critical ATPase responsible for Ca(2+) re-uptake during excitation-contraction coupling. Impaired Ca(2+) uptake resulting from decreased expression and reduced activity of SERCA2a is a hallmark of heart failure. Accordingly, restoration of SERCA2a expression by gene transfer has proved to be effective in improving cardiac function in heart-failure patients, as well as in animal models. The small ubiquitin-related modifier (SUMO) can be conjugated to lysine residues of target proteins, and is involved in many cellular processes...
September 29, 2011: Nature
Sudhish Mishra, Nidas A Undrovinas, Victor A Maltsev, Vitaliy Reznikov, Hani N Sabbah, Albertas Undrovinas
The emerging paradigm for Na(+) current in heart failure (HF) is that its transient component (I(NaT)) responsible for the action potential (AP) upstroke is decreased, whereas the late component (I(NaL)) involved in AP plateau is augmented. Here we tested whether Na(v)β(1)- and Na(v)β(2)-subunits can modulate I(NaL) parameters in normal and failing ventricular cardiomyocytes (VCMs). Chronic HF was produced in nine dogs by multiple sequential coronary artery microembolizations, and six dogs served as a control...
October 2011: American Journal of Physiology. Heart and Circulatory Physiology
Yoshiki Uehara, Yoshiyuki Azuma, Kosuke Minai, Hiroshi Yoshida, Michihiro Yoshimura, Mitsuyuki Shimizu
Endothelin-1 (ET-1) is involved in the development of cardiac hypertrophy and heart failure. We investigated the effects of ET-1 on intracellular calcium transient and its mechanisms. Neonatal rat cardiomyocytes were prepared and calcium transient was measured using fura-2. Treatment with ET-1 for 48 h prolonged calcium transient decay. In the presence of thapsigargin, ET-1 did not alter calcium transient decay. On the other hand, the prolonged calcium transient decay was maintained even when sodium was removed from the bath solution...
January 2012: Heart and Vessels
Ignatius Gerardo Zarraga, Li Zhang, Matthew R Stump, Qiuming Gong, G Michael Vincent, Zhengfeng Zhou
BACKGROUND: Nonsense and frameshift mutations are common in congenital long QT syndrome type 2 (LQT2). We previously demonstrated that hERG nonsense mutations cause degradation of mutant mRNA by nonsense-mediated mRNA decay (NMD) and are associated with mild clinical phenotypes. The impact of NMD on the expression of hERG frameshift mutations and their phenotypic severity is not clear. OBJECTIVE: The purpose of this study was to examine the role of NMD in the pathogenesis of a hERG frameshift mutation, P926AfsX14, identified in a large LQT2 kindred and characterize genotype-phenotype correlations...
August 2011: Heart Rhythm: the Official Journal of the Heart Rhythm Society
Krishna Prasad Subedi, Joon-Chul Kim, Moonkyung Kang, Min-Jeong Son, Yeon-Soo Kim, Sun-Hee Woo
Voltage-dependent anion channels (VDACs) are pore forming proteins predominantly found in the outer mitochondrial membrane and are thought to transport Ca(2+). In this study, we have investigated the possible role of type 2 VDAC (VDAC2) in cardiac Ca(2+) signaling and Ca(2+) sparks using a lentiviral knock-down (KD) technique and two-dimensional confocal Ca(2+) imaging in immortalized autorhythmic adult atrial cells, HL-1. We confirmed high expression of VDAC2 protein in ventricular, atrial, and HL-1 cells using Western blot analysis...
February 2011: Cell Calcium
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"