Tumour necrosis factor-α activates a calcium sensitization pathway in guinea-pig bronchial smooth muscle

摘要

The effects of tumour necrosis factor-α (TNF) on guinea-pig bronchial smooth muscle contractility were investigated.The Ca2+-activated contractile response of permeabilized bronchial smooth muscle strips was significantly increased after incubation with 1 μg ml−1 TNF for 45 min. This TNF-induced effect was not due to a further increase in intracellular Ca2+.The TNF-induced Ca2+ sensitization was, at least partly, the result of an increase in myosin light chain20 phosphorylation.The intracellular signalling pathway involved in this effect of TNF was further investigated. Sphingomyelinase, a potential mediator of TNF, had no effect on Ca2+ sensitivity of permeabilized bronchial smooth muscle. Also, p42/p44 mitogen-activated protein kinase (p42/p44mapk), activated by TNF in some cell types, did not show an increased activation in bronchial smooth muscle after TNF treatment.In conclusion, TNF may activate a novel signalling pathway in guinea-pig bronchial smooth muscle leading to an increase in myosin light chain20 phosphorylation and a subsequent increase in Ca2+ sensitivity of the myofilaments. This pathway does not appear to involve sphingomyelinase-liberated ceramides or activation of p42/p44mapk. Given the importance of TNF in asthma, this TNF-induced Ca2+ sensitization of the myofilaments may represent a mechanism responsible for airway hyper-responsiveness.