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  1. Article ; Online: S100A1 in cardiovascular health and disease: closing the gap between basic science and clinical therapy.

    Kraus, Carolin / Rohde, David / Weidenhammer, Christian / Qiu, Gang / Pleger, Sven T / Voelkers, Mirko / Boerries, Melanie / Remppis, Andrew / Katus, Hugo A / Most, Patrick

    Journal of molecular and cellular cardiology

    2009  Volume 47, Issue 4, Page(s) 445–455

    Abstract: Calcium (Ca(2+)) signaling plays a major role in a wide range of physiological functions including control and regulation of cardiac and skeletal muscle performance and vascular tone. As all Ca(2+) signals require proteins to relay intracellular Ca(2+) ... ...

    Abstract Calcium (Ca(2+)) signaling plays a major role in a wide range of physiological functions including control and regulation of cardiac and skeletal muscle performance and vascular tone. As all Ca(2+) signals require proteins to relay intracellular Ca(2+) oscillations downstream to different signaling networks, a specific toolkit of Ca(2+)-sensor proteins involving members of the EF-hand S100 Ca(2+) binding protein superfamily maintains the integrity of the Ca(2+) signaling in a variety of cardiac and vascular cells, transmitting the message with great precision and in a temporally and spatially coordinated manner. Indeed, the possibility that S100 proteins might contribute to heart and vascular diseases was first suggested by the discovery of distinctive patterns of S100 expression in healthy and diseased hearts and vasculature from humans and animal heart failure (HF) models. Based on more elaborate genetic studies in mice and strategies to manipulate S100 protein expression in human cardiac, skeletal muscle and vascular cells, it is now apparent that the integrity of distinct S100 protein isoforms in striated muscle and vascular cells such as S100A1, S100A4, S100A6, S100A8/A9 or S100B is a basic requirement for normal cardiovascular and muscular development and function; loss of integrity would naturally lead to profound deregulation of the implicated Ca(2+) signaling systems with detrimental consequences to cardiac, skeletal muscle, and vascular function. The brief debate and discussion here are confined by design to the biological actions and pathophysiological relevance of the EF-hand Ca(2+)-sensor protein S100A1 in the heart, vasculature and skeletal muscle with a particular focus on current translational therapeutic strategies. By virtue of its ability to modulate the activity of numerous key effector proteins that are essentially involved in the control of Ca(2+) and NO homeostasis in cardiac, skeletal muscle and vascular cells, S100A1 has been proven to play a critical role both in cardiac performance, blood pressure regulation and skeletal muscle function. Given that deregulated S100A1 expression in cardiomyocytes and endothelial cells has recently been linked to heart failure and hypertension, it is arguably a molecular target of considerable clinical interest as S100A1 targeted therapies have already been successfully investigated in preclinical translational studies.
    MeSH term(s) Animals ; Cardiovascular Diseases/metabolism ; Cardiovascular Diseases/pathology ; Cardiovascular Diseases/physiopathology ; Cardiovascular Diseases/therapy ; Clinical Medicine ; Health ; Humans ; Multigene Family/genetics ; S100 Proteins/chemistry ; S100 Proteins/genetics ; S100 Proteins/metabolism
    Chemical Substances S100 Proteins ; S100A1 protein
    Language English
    Publishing date 2009-06-16
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 80157-4
    ISSN 1095-8584 ; 0022-2828
    ISSN (online) 1095-8584
    ISSN 0022-2828
    DOI 10.1016/j.yjmcc.2009.06.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Kir2.x inward rectifier potassium channels are differentially regulated by adrenergic alpha1A receptors.

    Zitron, Edgar / Günth, Myriam / Scherer, Daniel / Kiesecker, Claudia / Kulzer, Martin / Bloehs, Ramona / Scholz, Eberhard P / Thomas, Dierk / Weidenhammer, Christian / Kathöfer, Sven / Bauer, Alexander / Katus, Hugo A / Karle, Christoph A

    Journal of molecular and cellular cardiology

    2008  Volume 44, Issue 1, Page(s) 84–94

    Abstract: Inhibition of I(K1) currents by adrenergic alpha(1) receptors has been observed in cardiomyocytes and has been linked to arrhythmogenesis in an animal model. Both PKC-dependent and PKC-independent pathways have been implied in this regulation. The ... ...

    Abstract Inhibition of I(K1) currents by adrenergic alpha(1) receptors has been observed in cardiomyocytes and has been linked to arrhythmogenesis in an animal model. Both PKC-dependent and PKC-independent pathways have been implied in this regulation. The underlying molecular mechanisms, however, have not been elucidated to date. The molecular basis of native I(K1) current is mainly formed by Kir2.1 (KCNJ2), Kir2.2 (KCNJ12) and Kir2.3 (KCNJ4) channels that are differentially regulated by protein kinases. We therefore sought to investigate the role of those different Kir2.x channel subunits in this regulation and to identify the major signalling pathways involved. Adrenergic alpha(1A) receptors (the predominant cardiac isoform) were co-expressed with cloned Kir2.1, Kir2.2 and Kir2.3 channels in Xenopus oocytes and electrophysiological experiments were performed using two-microelectrode voltage clamp. Native I(K1) currents were measured with the whole-cell patch clamp technique in isolated rat ventricular cardiomyocytes. Activation of co-expressed adrenergic alpha(1A) receptors by phenylephrine induced differential effects in Kir2.x channels. No effect was noticed in Kir2.1 channels. However, a marked inhibitory effect was observed in Kir2.2 channels. This regulation was not attenuated by inhibitors of PKC, CamKII and PKA (chelerythrine, KN-93, KT-5720), and mutated Kir2.2 channels lacking functional phosphorylation sites for PKC and PKA exhibited the same effect as Kir2.2 wild-type channels. By contrast, the regulation could be suppressed by the general tyrosine kinase inhibitor genistein and by the src tyrosine kinase inhibitor PP2 indicating an essential role of src kinases. This finding was validated in rat ventricular cardiomyocytes where co-application of PP2 strongly attenuated the inhibitory regulation of I(K1) current by adrenergic alpha(1) receptors. The inactive analogue PP3 was tested as negative control for PP2 and did not reproduce the effects of PP2. In Kir2.3 channels, a marked inhibitory effect of alpha(1A) receptor activation was observed. This regulation could be attenuated by inhibition of PKC with chelerythrine or with Ro-32-0432, but not by tyrosine kinase inhibition with genistein. In summary, on the molecular level the inhibitory regulation of I(K1) currents by adrenergic alpha(1A) receptors is probably based on effects on Kir2.2 and Kir2.3 channels. Kir2.2 is regulated via src tyrosine kinase pathways independent of protein kinase C, whereas Kir2.3 is inhibited by protein kinase C-dependent pathways. Src tyrosine kinase pathways are essential for the inhibition of native I(K1) current by adrenergic alpha(1) receptors. This regulation may contribute to arrhythmogenesis under adrenergic stimulation.
    MeSH term(s) Animals ; Calcium-Calmodulin-Dependent Protein Kinase Type 2/metabolism ; Cyclic AMP-Dependent Protein Kinases/metabolism ; Heart Ventricles/cytology ; Heart Ventricles/enzymology ; Heart Ventricles/metabolism ; Ion Channel Gating ; Myocytes, Cardiac/enzymology ; Myocytes, Cardiac/metabolism ; Potassium Channels, Inwardly Rectifying/antagonists & inhibitors ; Potassium Channels, Inwardly Rectifying/metabolism ; Protein Kinase C/metabolism ; Proto-Oncogene Proteins pp60(c-src)/metabolism ; Rats ; Receptors, Adrenergic, alpha-1/metabolism ; Xenopus
    Chemical Substances Kir2.1 channel ; Kir2.2 channel ; Potassium Channels, Inwardly Rectifying ; Receptors, Adrenergic, alpha-1 ; Proto-Oncogene Proteins pp60(c-src) (EC 2.7.10.2) ; Cyclic AMP-Dependent Protein Kinases (EC 2.7.11.11) ; Protein Kinase C (EC 2.7.11.13) ; Calcium-Calmodulin-Dependent Protein Kinase Type 2 (EC 2.7.11.17)
    Language English
    Publishing date 2008-01
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80157-4
    ISSN 1095-8584 ; 0022-2828
    ISSN (online) 1095-8584
    ISSN 0022-2828
    DOI 10.1016/j.yjmcc.2007.10.008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: The inotropic peptide βARKct improves βAR responsiveness in normal and failing cardiomyocytes through G(βγ)-mediated L-type calcium current disinhibition.

    Völkers, Mirko / Weidenhammer, Christian / Herzog, Nicole / Qiu, Gang / Spaich, Kristin / Wegner, Frederic V / Peppel, Karsten / Müller, Oliver J / Schinkel, Stefanie / Rabinowitz, Joseph E / Hippe, Hans-Jorg / Brinks, Henriette / Katus, Hugo A / Koch, Walter J / Eckhart, Andrea D / Friedrich, Oliver / Most, Patrick

    Circulation research

    2010  Volume 108, Issue 1, Page(s) 27–39

    Abstract: Rationale: The G(βγ)-sequestering peptide β-adrenergic receptor kinase (βARK)ct derived from the G-protein-coupled receptor kinase (GRK)2 carboxyl terminus has emerged as a promising target for gene-based heart failure therapy. Enhanced downstream cAMP ... ...

    Abstract Rationale: The G(βγ)-sequestering peptide β-adrenergic receptor kinase (βARK)ct derived from the G-protein-coupled receptor kinase (GRK)2 carboxyl terminus has emerged as a promising target for gene-based heart failure therapy. Enhanced downstream cAMP signaling has been proposed as the underlying mechanism for increased β-adrenergic receptor (βAR) responsiveness. However, molecular targets mediating improved cardiac contractile performance by βARKct and its impact on G(βγ)-mediated signaling have yet to be fully elucidated.
    Objective: We sought to identify G(βγ)-regulated targets and signaling mechanisms conveying βARKct-mediated enhanced βAR responsiveness in normal (NC) and failing (FC) adult rat ventricular cardiomyocytes.
    Methods and results: Assessing viral-based βARKct gene delivery with electrophysiological techniques, analysis of contractile performance, subcellular Ca²(+) handling, and site-specific protein phosphorylation, we demonstrate that βARKct enhances the cardiac L-type Ca²(+) channel (LCC) current (I(Ca)) both in NCs and FCs on βAR stimulation. Mechanistically, βARKct augments I(Ca) by preventing enhanced inhibitory interaction between the α1-LCC subunit (Cav1.2α) and liberated G(βγ) subunits downstream of activated βARs. Despite improved βAR contractile responsiveness, βARKct neither increased nor restored cAMP-dependent protein kinase (PKA) and calmodulin-dependent kinase II signaling including unchanged protein kinase (PK)Cε, extracellular signal-regulated kinase (ERK)1/2, Akt, ERK5, and p38 activation both in NCs and FCs. Accordingly, although βARKct significantly increases I(Ca) and Ca²(+) transients, being susceptible to suppression by recombinant G(βγ) protein and use-dependent LCC blocker, βARKct-expressing cardiomyocytes exhibit equal basal and βAR-stimulated sarcoplasmic reticulum Ca²(+) load, spontaneous diastolic Ca²(+) leakage, and survival rates and were less susceptible to field-stimulated Ca²(+) waves compared with controls.
    Conclusion: Our study identifies a G(βγ)-dependent signaling pathway attenuating cardiomyocyte I(Ca) on βAR as molecular target for the G(βγ)-sequestering peptide βARKct. Targeted interruption of this inhibitory signaling pathway by βARKct confers improved βAR contractile responsiveness through increased I(Ca) without enhancing regular or restoring abnormal cAMP-signaling. βARKct-mediated improvement of I(Ca) rendered cardiomyocytes neither susceptible to βAR-induced damage nor arrhythmogenic sarcoplasmic reticulum Ca²(+) leakage.
    MeSH term(s) Animals ; Calcium/metabolism ; Calcium Channels, L-Type/genetics ; Calcium Channels, L-Type/metabolism ; Cardiotonic Agents/metabolism ; Cell Survival/genetics ; G-Protein-Coupled Receptor Kinase 2 ; GTP-Binding Protein beta Subunits/genetics ; GTP-Binding Protein beta Subunits/metabolism ; GTP-Binding Protein gamma Subunits/genetics ; GTP-Binding Protein gamma Subunits/metabolism ; Genetic Therapy/methods ; Heart Failure/genetics ; Heart Failure/metabolism ; Heart Failure/therapy ; Heart Ventricles/metabolism ; MAP Kinase Signaling System/genetics ; Myocardial Contraction/genetics ; Myocytes, Cardiac/metabolism ; Peptides/genetics ; Peptides/metabolism ; Protein Kinases/genetics ; Protein Kinases/metabolism ; Rats ; Sarcoplasmic Reticulum/genetics ; Sarcoplasmic Reticulum/metabolism
    Chemical Substances Cacna1c protein, rat ; Calcium Channels, L-Type ; Cardiotonic Agents ; GTP-Binding Protein beta Subunits ; GTP-Binding Protein gamma Subunits ; Peptides ; Protein Kinases (EC 2.7.-) ; Grk2 protein, rat (EC 2.7.11.15) ; G-Protein-Coupled Receptor Kinase 2 (EC 2.7.11.16) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2010-11-24
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 80100-8
    ISSN 1524-4571 ; 0009-7330 ; 0931-6876
    ISSN (online) 1524-4571
    ISSN 0009-7330 ; 0931-6876
    DOI 10.1161/CIRCRESAHA.110.225201
    Database MEDical Literature Analysis and Retrieval System OnLINE

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