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. 1993 Feb;108(2):383–386. doi: 10.1111/j.1476-5381.1993.tb12813.x

NK2 receptors mediate plasma extravasation in guinea-pig lower airways.

C Tousignant 1, C C Chan 1, D Guevremont 1, C Brideau 1, J J Hale 1, M MacCoss 1, I W Rodger 1
PMCID: PMC1907971  PMID: 8383563

Abstract

1. Neurokinin (NK) receptor-mediated extravasation has been examined in guinea-pig airways by use of a recently described marker for microvascular protein leakage, 125I-labelled human fibrinogen. 2. Neurokinin A (NKA) caused a dose-dependent increase in plasma [125I]-fibrinogen extravasation in trachea, main bronchi, secondary bronchi and intraparenchymal airways. In contrast, the NK2 selective agonist [beta-Ala8]NKA(4-10) only caused extravasation in the secondary and intraparenchymal airways. 3. The NK2 selective antagonist, SR 48968, caused a dose-dependent inhibition of NKA and [beta-Ala8]NKA(4-10)-induced extravasation of fibrinogen in guinea-pig secondary bronchi and intraparenchymal airways. SR 48968 was without effect on the NKA-induced extravasation in trachea and main bronchi. 4. NKA- or [beta-Ala8]NKA(4-10)-induced plasma extravasation was not modified by pretreatment with histamine H1- or H2-receptor antagonists. 5. It is concluded that NK2 receptors mediate plasma [125I]-fibrinogen extravasation in guinea-pig secondary bronchi and intraparenchymal airways. This effect is direct and does not depend upon histamine released from mast cells.

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Selected References

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