Enhanced basal tension in isolated rat tracheal smooth muscle stimulated by electric field stimulation under low temperature.
Int J Med Sci
; 15(14): 1611-1615, 2018.
Article
em En
| MEDLINE
| ID: mdl-30588183
ABSTRACT
Exposure to cold causes cutaneous vasoconstriction to reduce body heat loss, while the airway warms up the inspired cold air, thus suggesting that cooling might evoke a response in tracheal smooth muscle different from that in cutaneous blood vessels. The aim of this study was to evaluate the effect of temperature on isolated rat trachea, with or without electric field stimulation (EFS). Tissue bath for isolated trachea was used. An in vitro isometric contraction of trachea from healthy male Sprague-Dawley rat (body weight ≥ 200 g) was continuously recorded. Tension in strips of rat trachea that were untreated and treated with EFS, was continuously recorded in stepwise manner at temperatures varying from 37 °C to 7 °C or from 7 °C to 37 °C. Results indicated that descent and re-ascent of temperature produced temperature-dependent tension changes. Basal tension of the trachea decreased when temperature was reduced if EFS was not applied. EFS-induced spike contraction decreased when temperature was reduced, while basal tension increased at the same time. We concluded that low temperature induced rapid and reproducible contraction in isolated rat tracheal strip only if EFS was applied. Increasing temperature reduced basal tension and enhanced EFS-induced spike contraction of the trachea at the same time.
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Texto completo:
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Traqueia
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Regulação da Temperatura Corporal
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Temperatura Baixa
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Contração Isométrica
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Músculo Liso
Limite:
Animals
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article