Calcium (Ca2+) is a unique cellular ion having a large intra-vs extracellular gradient (1:10,000) and playing a key role in mediating stimulus-contraction coupling in cardiac, skeletal, and vascular smooth muscle (VSM), as well as stimulus-secretion coupling in endocrine, neural, and renal tissues (1-8). Mechanistically, increasing myoplasmic free Ca2+ concentrations [Ca21, initiates contraction by binding to calmodulin, altering its tertiary structure, and promoting its binding to myosin light chain kinase (MLCK) (2), thereby removing the normal autoinhibition of this enzyme. Activation of MLCK begins a cascade of molecular rearrangements leading to myofilament shortening and contraction. Activated MLCK phosphorylates the light chain of myosin, stimulating its binding to actin filaments, resulting in fiber shortening and consequent contraction (3) (Fig.1). This [Caz+]ï initiated process is important in both depolarization-mediated and agonistmediated contraction.
- Hypertensive Subject
- Myosin Light Chain Kinase
- Dietary Salt
- Dehydroepiandrosterone Sulfate
- Smooth Muscle Function
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Barbagallo, M., Resnick, L.M. (1996). Calcium and Magnesium in the Regulation of Smooth Muscle Function and Blood Pressure. In: Sowers, J.R. (eds) Endocrinology of the Vasculature. Contemporary Endocrinology, vol 1. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-4612-0231-8_21
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