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Side 1 fra 2736 resultater
Smooth muscle contractility and protein tyrosine phosphorylation.
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During the last 5 years several studies have documented an involvement of protein tyrosine kinases (PTKs) in smooth muscle contraction and Ca2+ mobilization. Most of these studies have utilized highly selective inhibitors of PTKs, genistein and tyrphostin and have shown that these inhibitors
Aging and gastrointestinal smooth muscle.
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The present review is an attempt to put into perspective the available information on the putative changes in cellular mechanisms of the contractile properties of the aging gastrointestinal (GI) smooth muscle. Information on smooth muscle of the GI tract is scanty. Smooth muscle cells from old rats
Autophosphorylation of smooth-muscle caldesmon.
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Caldesmon, a major actin- and calmodulin-binding protein of smooth muscle, has been implicated in regulation of the contractile state of smooth muscle. The isolated protein can be phosphorylated by a co-purifying Ca2+/calmodulin-dependent protein kinase, and phosphorylation blocks inhibition of the
Smooth muscle cell growth factors.
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While the roles of the platelet-derived growth factors (PDGFs) in vascular smooth muscle cells (SMCs) continue to be elucidated, these cells, especially in their activated 'synthetic' state, have also been found to express, and proliferate in response to, many of the other families of polypeptide
Signal Transduction and Smooth Muscle
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Features of Ca2+ signals including the amplitude, duration, frequency and location are encoded by various physiological stimuli. These features of the signals are decoded by cells to selectively activate smooth muscle functions that include contraction and proliferation [1–3]. Central,
Migration of airway smooth muscle cells.
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Migration of smooth muscle cells is a process fundamental to development of hollow organs, including blood vessels and the airways. Migration is also thought to be part of the response to tissue injury. It has also been suggested to contribute to airways remodeling triggered by chronic inflammation.
Signal transduction in vascular smooth muscle.
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BACKGROUND
Vascular smooth muscle participates in the normal control of vascular tone and in the pathological adaptation of arteries in hypertension and atherosclerosis. Growth factors and vasoconstrictors activate overlapping signalling pathways that include activation of phospholipase C isoforms,
Caveolae-associated signalling in smooth muscle.
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Caveolae are flask-shaped invaginations in the membrane that depend on the contents of cholesterol and on the structural protein caveolin. The organisation of caveolae in parallel strands between dense bands in smooth muscle is arguably unique. It is increasingly recognised, bolstered in large part
[Cellular mechanisms of smooth muscle contraction].
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Myosin is an ATPase, able to form filaments with actin, thus initiating smooth muscle contraction (conversion of chemical energy into mechanical energy). Myosin activity is regulated by cytosolic calcium, via a calcium-calmodulin-MLCK-dependent phosphorylation. Extrusion of cytosolic calcium via
Tyrosine kinase inhibition prevents deformation-stimulated vascular smooth muscle growth.
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The goal of this study was to determine the role of tyrosine phosphorylation in transducing deformation-stimulated vascular smooth muscle growth. Rat aorta-derived vascular smooth muscle cells were cultured on flexible silicone elastomer membranes and subjected to cyclic deformation (15 cycles per
Tyrosine kinase inhibitors suppress agonist-induced contraction in smooth muscle.
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Because tyrosine kinases participate in diverse signalling pathways, we suspected that these enzymes might also participate in regulation of signal transduction in smooth muscle. Therefore, we studied the effects of geldanomycin, tyrphostin, and genistein, three structurally unrelated tyrosine
Tyrosine kinase pathways and the regulation of smooth muscle contractility.
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Epidermal growth factor (EGF) mediates three tyrosine kinase-dependent smooth muscle response paradigms, two of which comprise a rapid increase in muscle tension and one of which is characterized by an agonist-mediated reduction in sensitivity to other agents. The three types of response are
Tyrosine kinase-dependent calcium signaling in airway smooth muscle cells.
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Contractile agonists may stimulate mitogenic responses in airway smooth muscle by mechanisms that involve tyrosine kinases. The role of contractile agonist-evoked activation of tyrosine kinases in contractile signaling is not clear. We addressed this issue using cultured rat airway smooth muscle
Proliferative aspects of airway smooth muscle.
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Increased airway smooth muscle (ASM) mass is perhaps the most important component of the airway wall remodeling process in asthma. Known mediators of ASM proliferation in cell culture models fall into 2 categories: those that activate receptors with intrinsic receptor tyrosine kinase activity and
Tyrosine phosphorylation increases Ca2+ sensitivity of vascular smooth muscle contraction.
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In order to elucidate the role of tyrosine phosphorylation in vasoconstriction, we investigated the effects of inhibitors of tyrosine kinase (genistein, 30 microM) and phosphatase (sodium o-vanadate, 5 microM) on the contraction of aorta isolated from guinea pig. Genistein significantly inhibited
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