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Effects of temperature on cholinergic contractility of rabbit airway muscle.

Publication ,  Journal Article
Bratton, DL; Tanaka, DT; Grunstein, MM
Published in: J Appl Physiol (1985)
November 1987

To elucidate the mechanism underlying temperature-induced changes in airway cholinergic contractility, the effects of organ bath cooling were evaluated in isolated rabbit airway smooth muscle (ASM) segments isometrically contracted with methacholine (METH) (10(-8)-10(-3) M) and electrical field stimulation (ES), wherein the ES stimulus frequency was varied between 1 and 100 Hz. Cooling from 37 to 25 degrees C produced systematic increases (P less than 0.01) in isometric tension at various administered doses of METH and at different levels of ES. Since the potentiated contractions to ES significantly exceeded (P less than 0.001) the corresponding increases in METH-induced contractility, we evaluated whether the latter was attributed to temperature-mediated changes in intrinsic airway neuronal acetylcholine (ACh) release. Accordingly, the effects of ASM cooling were independently determined before and after inhibition of the Na+-K+ electrogenic pump with ouabain (10(-5) M), and depletion of intrinsic neuronal ACh stores with hemicholinium-3 (HC-3) (10(-3) M). In the presence of either ouabain or HC-3 the above responses to temperature reduction were reversed, and airway cooling was associated with abrupt relaxation of ASM segments precontracted with METH. In contrast, neither inhibition of cyclooxygenase products with indomethacin (10(-6) M) nor cholinesterase inhibition with neostigmine (10(-3) M) notably influenced the ASM responses to organ bath cooling. Thus these findings demonstrate that 1) both METH-induced and neurally mediated cholinergic contractility are augmented during airway cooling; 2) the potentiated cholinergic responses are attributed to enhanced presynaptic release of ACh at the airway neuromuscular junction.(ABSTRACT TRUNCATED AT 250 WORDS)

Duke Scholars

Published In

J Appl Physiol (1985)

DOI

ISSN

8750-7587

Publication Date

November 1987

Volume

63

Issue

5

Start / End Page

1933 / 1941

Location

United States

Related Subject Headings

  • Trachea
  • Temperature
  • Rabbits
  • Physiology
  • Parasympathetic Nervous System
  • Ouabain
  • Neostigmine
  • Methacholine Compounds
  • Methacholine Chloride
  • Indomethacin
 

Citation

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Bratton, D. L., Tanaka, D. T., & Grunstein, M. M. (1987). Effects of temperature on cholinergic contractility of rabbit airway muscle. J Appl Physiol (1985), 63(5), 1933–1941. https://doi.org/10.1152/jappl.1987.63.5.1933
Bratton, D. L., D. T. Tanaka, and M. M. Grunstein. “Effects of temperature on cholinergic contractility of rabbit airway muscle.J Appl Physiol (1985) 63, no. 5 (November 1987): 1933–41. https://doi.org/10.1152/jappl.1987.63.5.1933.
Bratton DL, Tanaka DT, Grunstein MM. Effects of temperature on cholinergic contractility of rabbit airway muscle. J Appl Physiol (1985). 1987 Nov;63(5):1933–41.
Bratton, D. L., et al. “Effects of temperature on cholinergic contractility of rabbit airway muscle.J Appl Physiol (1985), vol. 63, no. 5, Nov. 1987, pp. 1933–41. Pubmed, doi:10.1152/jappl.1987.63.5.1933.
Bratton DL, Tanaka DT, Grunstein MM. Effects of temperature on cholinergic contractility of rabbit airway muscle. J Appl Physiol (1985). 1987 Nov;63(5):1933–1941.

Published In

J Appl Physiol (1985)

DOI

ISSN

8750-7587

Publication Date

November 1987

Volume

63

Issue

5

Start / End Page

1933 / 1941

Location

United States

Related Subject Headings

  • Trachea
  • Temperature
  • Rabbits
  • Physiology
  • Parasympathetic Nervous System
  • Ouabain
  • Neostigmine
  • Methacholine Compounds
  • Methacholine Chloride
  • Indomethacin