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Involvement of tachykinin NK1 and NK2 receptors in substance P-induced microvascular leakage hypersensitivity and airway hyperresponsiveness in guinea-pigs

E Boichot, K Biyah, N Germain, X Emonds-Alt, V Lagente, C Advenier
European Respiratory Journal 1996 9: 1445-1450; DOI:
E Boichot
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K Biyah
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N Germain
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X Emonds-Alt
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V Lagente
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C Advenier
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Abstract

Tachykinins, such as substance P, might be involved in the development of airway hyperresponsiveness (AHR) and airway inflammation. However, it is unknown which tachykinin receptors mediate these biological activities. The effects of two antagonists of tachykinin neurokinin-1 (NK1) and tachykinin neurokinin-2 (NK2) receptors, SR 140333 and SR 48968, respectively, were investigated on substance P (SP)-induced airway hyperresponsiveness and potentiation of the histamine-induced increase in microvascular leakage, in phosphoramidon-pretreated guinea-pigs. Guinea-pigs were pretreated with phosphoramidon (0.1 mM aerosol for 15 min) and exposed 15 min later to saline solution alone or to saline solution containing SP (0.1 mg.mL-1 for 30 min). Twenty four hours later, the animals were anaesthetized and prepared for the recording of the pulmonary inflation pressure (PIP) to acetylcholine or for the investigation of microvascular leakage to histamine. Pretreatment of the guinea-pigs with a single dose of SR 48968 (1 mg.kg-1, i.p.) 30 min before SP exposure, significantly prevented the development of AHR, whereas SR 140333 (1 mg.kg-1, i.p.) did not. In a second set of experiments, phosphoramidon-pretreated guinea-pigs exposed to SP presented a significant potentiation of the histamine-induced increase in microvascular leakage in pulmonary airways. When the guinea-pigs were pretreated with SR 140333, an inhibition of the increased microvascular leakage to histamine was observed. In contrast, no significant inhibitory activity was noted when the guinea-pigs were pretreated with SR 48968. The present data demonstrate the importance of tachykinin NK2 receptor stimulation in the development of airway hyperresponsiveness and that of tachykinin NK1 receptor stimulation in microvascular leakage hypersensitivity in phosphoramidon-pretreated and substance P-exposed guinea-pigs. The results also suggest a dissociation between the presence of microvascular leakage and the occurrence of airway hyperresponsiveness.

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Involvement of tachykinin NK1 and NK2 receptors in substance P-induced microvascular leakage hypersensitivity and airway hyperresponsiveness in guinea-pigs
E Boichot, K Biyah, N Germain, X Emonds-Alt, V Lagente, C Advenier
European Respiratory Journal Jul 1996, 9 (7) 1445-1450;

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Involvement of tachykinin NK1 and NK2 receptors in substance P-induced microvascular leakage hypersensitivity and airway hyperresponsiveness in guinea-pigs
E Boichot, K Biyah, N Germain, X Emonds-Alt, V Lagente, C Advenier
European Respiratory Journal Jul 1996, 9 (7) 1445-1450;
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