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          Institute: MPI für Herz- und Lungenforschung (W. G. Kerckhoff Institut)     Collection: Publikationen des W. G. Kerckhoff-Instituts     Display Documents

ID: 428376.0, MPI für Herz- und Lungenforschung (W. G. Kerckhoff Institut) / Publikationen des W. G. Kerckhoff-Instituts
Expression profiling of cardiac genes in Tako-Tsubo cardiomyopathy: insight into a new cardiac entity
Authors:Nef, H. M.; Mollmann, H.; Troidl, C.; Kostin, S.; Bottger, T.; Voss, S.; Hilpert, P.; Krause, N.; Weber, M.; Rolf, A.; Dill, T.; Schaper, J.; Hamm, C. W.; Elsasser, A.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:J Mol Cell Cardiol
Issue / Number:2
Start Page:395
End Page:404
Audience:Not Specified
Abstract / Description:Tako-Tsubo cardiomyopathy (TTC) is characterized by a transient contractile dysfunction, but its specific pathomechanism remains unknown. Thus, we performed a systematic expression profiling of genes by microarray analysis in the acute phase and after functional recovery. We studied 3 female patients presenting with TTC. Complementary RNA was isolated from left ventricular biopsies taken in the acute phase (group A) and after functional recovery (group B). It was profiled for gene expression using cDNA microarrays. Functionally related genes were determined with the Gene Set Enrichment Analysis (GSEA) bioinformatic tool. Validation of selected genes was performed by means of real-time PCR and immunohistochemistry. In group A, different functional gene sets, such as Nrf2-induced genes, triggered by oxidative stress, and protein biosynthesis were significantly overrepresented among the upregulated targets. Increased transcription of GPX1, CAT, RPS6, and eIF4E was confirmed by RT-PCR. The targets of the Akt/PKB signaling showed significant upregulation in both groups. Immunohistochemistry showed that the downstream targets NF-kappaB and BcL-X(L) are upregulated and activated. Gene sets involved in energy metabolism (oxidative phosphorylation, mitochondrial genes) showed no differences in group A but were overexpressed in group B. This study demonstrated a significant contribution of oxidative stress to the pathomechanism of TTC; it is possibly triggered by excess catecholamine. Increased protein biosynthesis and an activated cell survival cascade can be interpreted as potential compensatory mechanisms. After functional recovery, processes involved in energy metabolism play a pivotal role, thereby potentially contributing to the normalization of contractile function.
Free Keywords:Aged Aged, 80 and over Female *Gene Expression Profiling Gene Expression Regulation Humans I-kappa B Proteins/metabolism Immunoblotting Immunohistochemistry Myocardium/*metabolism/*pathology Oxidative Stress Reproducibility of Results Reverse Transcriptase Polymerase Chain Reaction Superoxides/metabolism Takotsubo Cardiomyopathy/*genetics Transcription, Genetic bcl-X Protein/metabolism
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für physiologische und klinische Forschung
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