smooth/phosphatase

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Halothane increases smooth muscle protein phosphatase in airway smooth muscle.

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BACKGROUND Halothane relaxes airway smooth muscle, in part, by decreasing the force produced for a given intracellular [Ca(2+)] (i.e., Ca(2+) sensitivity) during muscarinic stimulation, an effect produced by a decrease in regulatory myosin light-chain (rMLC) phosphorylation. The authors tested the

Purification of smooth muscle phosphatases.

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Airway smooth muscle.

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The greatest impetus to research in elucidating the fundamental biophysics and biochemistry of airway smooth muscle (ASM) has undoubtedly been provided by the need to understand how these are altered in asthma. Many of the biophysical and biochemical properties of this muscle have been reviewed

The dominant protein phosphatase PP1c isoform in smooth muscle cells, PP1cβ, is essential for smooth muscle contraction.

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Contractile force development of smooth muscle is controlled by balanced kinase and phosphatase activities toward the myosin regulatory light chain (RLC). Numerous biochemical and pharmacological studies have investigated the specificity and regulatory activity of smooth muscle myosin light-chain

Alkaline phosphatase in vascular smooth muscle.

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Smooth muscle myosin light chain phosphatase.

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Calponin phosphatase from smooth muscle: a possible role of type 1 protein phosphatase in smooth muscle relaxation.

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Smooth muscle myosin bound phosphatase (MBP) purified from chicken gizzard, which is a holoenzyme of type 1 delta protein phosphatase and dephosphorylated intact myosin, catalyzed the dephosphorylation of calponin phosphorylated by protein kinase C (PK-C). The Km of MBP for calponin was 0.6 microM

Smooth muscle phosphatases: structure, regulation, and function.

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Smooth muscle contraction is regulated primarily by the reversible phosphorylation of myosin by myosin light chain kinase. Secondary mechanisms that might modulate contractility are phosphorylation-dephosphorylation of myosin light chain kinase and thin-filament proteins, caldesmon and calponin.

[The structure of smooth muscle myosin phosphatase].

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Inhibitor-1 phosphatase activity in vascular smooth muscle.

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The histone-H1 and polylysine stimulated "latent" phosphorylase phosphatase, characterized by a molecular weight of 260,000 in gel filtration and 130,000 in sucrose density gradient centrifugation has been identified as a major inhibitor-1 phosphatase in vascular smooth muscle. Its substrate:

Interaction of smooth muscle myosin phosphatase with phospholipids.

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The 130 kDa myosin-binding subunit (MBS) of smooth muscle myosin phosphatase was detected in cytoskeletal, cytosolic, and membrane fractions of T24 cells. Also, MBS was distributed between cytoplasm and plasmalemma in mitotic REF52 cells. These observations prompted this study of the interaction(s)

Smooth muscle-selective CPI-17 expression increases vascular smooth muscle contraction and blood pressure.

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Recent data revealed that protein kinase C-potentiated myosin phosphatase inhibitor of 17 kDa (CPI-17), a myosin phosphatase inhibitory protein preferentially expressed in smooth muscle, is upregulated/activated in several diseases but whether this CPI-17 increase plays a causal role in

Interactions and properties of smooth muscle myosin phosphatase.

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Interactions of the type 1 phosphatase catalytic subunit (PP1c) and the myosin phosphatase holoenzyme (MBP) were compared using affinity columns. In the absence of ATP, MBP bound to dephosphorylated myosin, heavy meromyosin (HMM), and subfragment 1. In contrast, PP1c was not bound. In the presence

[Role of myosin phosphatase in smooth muscle contraction].

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Smooth muscle contraction and relaxation.

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This brief review serves as a refresher on smooth muscle physiology for those educators who teach in medical and graduate courses of physiology. Additionally, those professionals who are in need of an update on smooth muscle physiology may find this review to be useful. Smooth muscle lacks the

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