MicroRNA 486-3P as a stability marker in acute coronary syndrome

Easily accessible biomarkers are needed to diagnose cardiovascular disease precisely—particularly, to distinguish between disease subtypes that are encountered in clinical practice. Per the hypothesis that plasma miRNA is valuable for this purpose, we performed complete transcriptional profiling of an miRNA discovery-set in 14 samples: three patients with ST-elevated acute myocardial infarction (STEMI) at baseline and after three months of follow-up, four with stable ischaemic heart disease (stable-IHD) and four healthy age-matched volunteers. Our aim was to determine whether we could distinguish patients with unstable plaques from stable patients following a STEMI event. After analysing miRNA profiles, we conducted a validation study comparing three-month STEMI (n=40) with stable-IHD (n=35), which confirmed that miR-486-3P differentiates patients with three-month STEMI from those with stable-IHD (P=0.019)

Alternative splicing of human peroxisome proliferator-activated receptor delta (PPARdelta):effects on translation efficiency and trans-activation ability

<p>Abstract</p> <p>Background</p> <p>Peroxisome proliferator-activated receptor delta (PPARδ) is a member of the nuclear receptor superfamily. Numerous studies have aimed at unravelling the physiological role of PPARδ as a transcriptional regulator whereas the regulation of PPARδ gene expression has been less studied.</p> <p>Results</p> <p>The principal transcription start site in the human PPARδ gene identified here is positioned upstream of exon 1, although four alternative 5'-ends related to downstream exons were identified. The demonstration of multiple 5'-UTR splice variants of PPARδ mRNA, with an impact on translation efficiency, suggests a translational regulation of human PPARδ expression. Five untranslated exons identified in this study contribute to the variability among the 5'-UTRs of human PPARδ mRNAs. Moreover, <it>in vitro </it>studies of a 3'-splice transcript encoding a truncated variant of PPARδ (designated PPARδ2) show that this isoform constitutes a potential dominant negative form of the receptor.</p> <p>Conclusion</p> <p>We propose that alternative splicing of human PPARδ constitutes an intrinsic role for the regulation of PPARδ expression and thus activity, and highlight the significance of alternative splicing of this nuclear receptor in physiology and disease.</p

Cardiac expression of the microsomal triglyceride transport protein protects the heart function during ischemia

Aims: The microsomal triglyceride transport protein (MTTP) is critical for assembly and secretion of apolipoprotein B (apoB)-containing lipoproteins and is most abundant in the liver and intestine. Surprisingly, MTTP is also expressed in the heart. Here we tested the functional relevance of cardiac MTTP expression. Materials and methods: We combined clinical studies, advanced expression analysis of human heart biopsies and analyses in genetically modified mice lacking cardiac expression of the MTTP-A isoform of MTTP. Results: Our results indicate that lower cardiac MTTP expression in humans is associated with structural and perfusion abnormalities in patients with ischemic heart disease. MTTP-A deficiency in mice heart does not affect total MTTP expression, activity or lipid concentration in the heart. Despite this, MTTP-A deficient mice displayed impaired cardiac function after a myocardial infarction. Expression analysis of MTTP indicates that MTTP expression is linked to cardiac function and responses in the heart. Conclusions: Our results indicate that MTTP may play an important role for the heart function in conjunction to ischemic events

Allele-specific regulation of MTTP expression influences the risk of ischemic heart disease

Peer reviewe

Lack of genetic susceptibility in takotsubo cardiomyopathy: a case-control study

Abstract Background Takotsubo cardiomyopathy (TCM), also known as “broken heart syndrome”, is a type of heart failure characterized by transient ventricular dysfunction in the absence of obstructive coronary lesions. Although associated with increased levels of catecholamines, pathophysiological mechanisms are unknown. Relapses and family heritability indicate a genetic predisposition. Several small studies have investigated associations between three different loci; the β1-adrenic receptor (ADRB1), G-protein-coupled receptor kinase 5 (GRK5), Bcl-associated athanogene 3 (BAG3) and TCM but no consensus has been reached. Methods Participants were recruited using the Swedish Coronary Angiography and Angioplasty Register (SCAAR). TCM patients without coronary artery disease (CAD)(n = 258) were identified and age- and sex-matched subjects with (n = 164) and without (n = 243) CAD were selected as controls. DNA was isolated from saliva and genotyped for candidate single nucleotide polymorphisms in the ADRB1, GRK5 and BAG3 genes. Allele frequencies and Odds Ratios (OR) with 95% Confidence Intervals (CI) for the investigated polymorphisms were compared, respectively calculated for TCM patients and controls. Results There were no differences in allele frequencies between TCM patients and controls. OR (CI) for TCM patients having at least one minor allele using controls as reference were 1.07 (0.75–1.55) for ADRB1, 0.45 (0.11–1.85) for GRK5 and 1.27 (0.74–2.19) for BAG3. Conclusion By genotyping a large takotsubo cohort, we demonstrate a lack of association between candidate SNPs in the ADRB1, GRK5 and BAG3 genes, earlier suggested to contribute to TCM. Our result indicates a need to expand the search for new genetic candidates contributing to TCM

Alternative splicing of human peroxisome proliferator-activated receptor delta (PPARdelta):effects on translation efficiency and -activation ability-3

<p><b>Copyright information:</b></p><p>Taken from "Alternative splicing of human peroxisome proliferator-activated receptor delta (PPARdelta):effects on translation efficiency and -activation ability"</p><p>http://www.biomedcentral.com/1471-2199/8/70</p><p>BMC Molecular Biology 2007;8():70-70.</p><p>Published online 16 Aug 2007</p><p>PMCID:PMC2045109.</p><p></p

Alternative splicing of human peroxisome proliferator-activated receptor delta (PPARdelta):effects on translation efficiency and -activation ability-9

<p><b>Copyright information:</b></p><p>Taken from "Alternative splicing of human peroxisome proliferator-activated receptor delta (PPARdelta):effects on translation efficiency and -activation ability"</p><p>http://www.biomedcentral.com/1471-2199/8/70</p><p>BMC Molecular Biology 2007;8():70-70.</p><p>Published online 16 Aug 2007</p><p>PMCID:PMC2045109.</p><p></p>entified exons (denoted in row) indicated. The genomic positions of the new exons were deduced by comparing their sequences to that of the human PPARδ gene [GenBank: ]. The sequences of splice junctions and alternative 5'-ends related to these exons are outlined in Tables 1 and 2, respectively. . A schematic representation of the PPARδ gene showing coding exons (boxes), previously reported untranslated exons or part of exons (boxes), and herein identified untranslated exons (boxes). The analysed and discussed variety of splicing among untranslated exons and alternative 5'-ends identified by Marathon 5'-RACE as described in "Methods" is shown below the gene ()