On Ca2+ sensitivity and the airways: not just any smooth muscle
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چکیده
منابع مشابه
On Ca2+ sensitivity and the airways: Not just any smooth muscle.
O ne of the more difficult questions raised by our students is: ''What purpose does bronchoconstriction serve? What is its evolutionary advantage?'' The most common answer is that narrowing of the airways increases air velocity and shear, thus facilitating removal of materials in the lumen during cough. From a simplistic point of view, it is difficult to see how under other circumstances sustai...
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A β-escin-permeabilized canine tracheal smooth muscle preparation was used to test the hypothesis that cGMP decreases Ca2+ sensitivity in airway smooth muscle primarily by inhibiting the membrane receptor-coupled mechanisms that regulate Ca2+ sensitivity and not by inhibiting Ca2+/calmodulin activation of the contractile proteins. 8-Bromo-cGMP (100 μM) had no effect on the free Ca2+concentratio...
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Endothelin is a potent mammalian vasoconstrictive peptide with structural homology to cation channel-binding insect toxins. We tested the proposal that this peptide directly activates dihydropyridine-sensitive Ca2+ channels in cultured vascular smooth muscle (VSM) cells. First, we found that cell Ca2+ can be altered in VSM by activation of voltage-operated Ca2+ channels. KCl-induced depolarizat...
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We studied in beta-escin-permeabilized canine tracheal smooth muscle (CTSM) the effect of the protein kinase C (PKC) agonist phorbol 12,13-dibutyrate (PDBu) on isometric force at a constant submaximal Ca2+ concentration (i.e., the effect on Ca2+ sensitivity) and regulatory myosin light-chain (rMLC) phosphorylation. PDBu increased Ca2+ sensitivity, an increase associated with a concentration-dep...
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Airway smooth muscle (ASM) shortening is the central event leading to bronchoconstriction. The degree to which airway narrowing occurs as a consequence of shortening is a function of both the mechanical properties of the airway wall as well as the orientation of the muscle fibers. Although the latter is theoretically important, it has not been systematically measured to date. The purpose of thi...
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ژورنال
عنوان ژورنال: European Respiratory Journal
سال: 2006
ISSN: 0903-1936,1399-3003
DOI: 10.1183/09031936.06.00099406