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AJP - Cell Physiology, Vol 271, Issue 5 C1660-C1668, Copyright © 1996 by American Physiological Society
ARTICLES |
R. D. Hubmayr, S. A. Shore, J. J. Fredberg, E. Planus, R. A. Panettieri Jr, W. Moller, J. Heyder and N. Wang
Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02115, USA.
Using magnetic twisting cytometry (MTC), we measured the cytoskeletal stiffness of adherent human airway smooth muscle (HASM) cells. We hypothesized that modulation of actin-myosin interactions by application of contractile agonists would induce changes in cytoskeletal stiffness. In cells plated on high-density collagen, bradykinin (10(-6) M) and histamine (10(-4) M) increased stiffness by 85 +/- 15 and 68 +/- 16%, respectively. Increases in cell stiffness were also consistently observed after acetylcholine, substance P, and KCl. The bronchodilator agonists isoproterenol, prostaglandin E2, forskolin, dibutryl adenosine 3', 5'-cyclic monophosphate, and 8-bromoguanosine 3', 5'-cyclic monophosphate each caused a dose-dependent decrease in cell stiffness in unstimulated as well as bradykinin-treated cells. HASM cells plated on high-density collagen were stiffer than cells plated on low-density collagen (126 +/- 16 vs. 43 +/- 3 dyn/cm2) and developed more pronounced increases in stiffness in response to bradykinin as well as more pronounced decreases in stiffness in response to isoproterenol. These results are consistent with the hypothesis that modulation of actin-myosin interactions by application of contractile agonists causes changes in cytoskeletal stiffness of HASM cells. MTC may be a valuable tool for evaluating the mechanisms of pharmacomechanical coupling in airway smooth muscle cells in culture.
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