http://cardiovascres.oxfordjournals.org – Objective: Left ventricular assist devices (LVAD) are used to ‘bridge’ patients with end-stage heart failure to transplantation. After long-term LVAD support, ventricular function may partially recover, a process called ‘reverse remodeling’. As several kinase-mediated signal transduction pathways have been implicated in the development of cardiac hypertrophy and failure, we examined the activities of the Erks, MEKs, Akt, GSK-3β, p70S6K, JNKs and p38 under LVAD support as well as during single myocyte strain and whole heart stretch. Read more »

http://www3.interscience.wiley.com – Cardiac myocytes react to diverse mechanical demands with a multitude of transient and long-term responses to normalize the cellular mechanical environment. Several stretch-activated signaling pathways have been identified, most prominently guanine nucleotide binding proteins (G-proteins), mitogen-activated protein kinases (MAPK), Janus-associated kinase/signal transducers and activators of transcription (JAK/STAT), protein kinase C (PKC), calcineurin, intracellular calcium regulation, and several autocrine and paracrine factors. Multiple levels of crosstalk exist between pathways. Read more »

http://www.ncbi.nlm.nih.gov:80 – Angiogenesis is controlled by physical interactions between cells and extracellular matrix as well as soluble angiogenic factors, such as VEGF. However, the mechanism by which mechanical signals integrate with other microenvironmental cues to regulate neovascularization remains unknown. Here we show that the Rho inhibitor, p190RhoGAP, controls capillary network formation in vitro and retinal angiogenesis in vivo by modulating the balance of activities between two antagonistic transcription factors – TFII-I and GATA2 – that govern gene expression of the VEGF receptor, VEGFR2. Read more »

http://www.sciencedirect.com – Deletion or mutation of a variety of proteins localized at cell-matrix and cell-cell junctions, such as vinculin and its splice-variant metavinculin, can lead to dilated cardiomyopathy in mice and humans, leading some to hypothesize that these molecules are involved in mechanotransmission or mechanotransduction in the heart. To investigate cardiac mechanotransduction mechanisms in single cells, we have combined laser tweezers with a fluorescence resonance energy transfer (FRET) biosensor to apply localized forces and probe localized signaling events in isolated mouse ventricular myocytes. Read more »

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