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Characteristics of the functional state of rat tracheal and bronchial smooth muscle at different stages of alveolitis

  • Comparative And Ontogenic Physiology
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Abstract

In isolated tracheal smooth muscle preparations in normal rats and in rats with experimental fibrotic alveolitis, responses to electrical field stimulation of nervous and muscle fibers were studied. At stimulation of muscles or nerves of tracheal preparations without intramural ganglia in rats with acute alveolitis, parameters of smooth muscle contractions did not practically differ from those in normal rats. In rats with fibrotic alveolitis the amplitude and rate of muscle contraction decreased, while the response latent period (LP) increased. At stimulation of preganglionic nerve fibers of the tracheal preparations with intramural ganglia in rats with acute alveolitis, the value and rate of smooth muscle contraction decreased, while the response LP increased. After transition into chronic phase of the disease (fibrotic alveolitis), a partial restoration of the response parameters took place. In rats with acute alveolitis, the repeated stimulation of the nerve fibers led to an increase of amplitude and a decrease of rate of tracheal smooth muscle contractions. In rats with fibrotic alveolitis, the repeated stimulation caused a decrease of amplitude and rate of contractions and an increase of the response LP.

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Authors and Affiliations

  1. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, Russia

    A. N. Fedin, E. A. Nekrasova, S. A. Frolova, A. I. Krivchenko & L. N. Danilov

  2. Research Institute of Pulmonology, Pavlov St. Petersburg State Medical University, St. Petersburg, Russia

    E. S. Lebedeva & M. N. Il’kovich

Authors
  1. A. N. Fedin
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  2. E. A. Nekrasova
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  3. S. A. Frolova
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  4. A. I. Krivchenko
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  5. L. N. Danilov
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  6. E. S. Lebedeva
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  7. M. N. Il’kovich
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Additional information

Original Russian Text © A.N. Fedin, E.A. Nekrasova, S.A. Frolova, A.I. Krivchenko, L.N. Danilov, E.S. Lebedeva, and M.N. Il’kovich, 2006, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2006, Vol. 42, No. 1, pp. 57–62.

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Fedin, A.N., Nekrasova, E.A., Frolova, S.A. et al. Characteristics of the functional state of rat tracheal and bronchial smooth muscle at different stages of alveolitis. J Evol Biochem Phys 42, 70–76 (2006). https://doi.org/10.1134/S0022093006010091

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  • DOI: https://doi.org/10.1134/S0022093006010091

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