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Effects of tachykinin NK1 or PAF receptor blockade on the lung injury induced by scorpion venom in rats.

Abstract：

:In cases of severe human scorpion envenoming, lung injury is a common finding and frequently the cause of death. In the rat, two distinct mechanisms account for oedema following the intravenous injection of the venom -- acute left ventricular failure resulting from a massive release of catecholamines and an increase in pulmonary vascular permeability. In the present work, we investigated the effects of a tachykinin NK1 receptor antagonist (CP96,345, the dihydrochloride salt of (2S,3S)-cis-2-(diphenylmethyl)-N-((2-methoxyphenyl)methyl)-1-az abicycol[2.2.2]octan-3-amine) and its 2 R-3 R inactive enantiomer (CP96,344) on the acute lung injury induced by the i.v. injection of Tityus serrulatus venom in rats. Lung injury was assessed by evaluating the extravasation of Evans blue dye in the bronchoalveolar lavage fluid and in the lung of venom-treated and control animals. The effects of the platelet-activating factor (PAF) receptor antagonist WEB2170 (2-methyl-1-phenylimidazol[4,5c]pyridine) were evaluated for comparison. The i.v. injection of the venom induced the extravasation of Evans blue in the bronchoalveolar lavage fluid and into the left lung. Pretreament with the tachykinin NK1 receptor antagonist CP96,345, but not CP96,344, inhibited Evans blue dye extravasation in the bronchoalveolar lavage fluid and in the lung by 96% and 86%, respectively. The PAF receptor antagonist WEB2170 inhibited the increase in vascular permeability in the bronchoalveolar lavage fluid by 60% and had no effect on the extravasation to the lung parenchyma of venom-injected animals. In addition to abrogating lung injury, pretreatment of rats with CP96,345, but not CP96,344 or WEB2170, decreased by 70% the mortality induced by the venom. This is the first study to show the relevance of the tachykinin NK1 receptor in mediating lung injury and mortality in animals injected with the neurotoxic T. serrulatus venom. Blockade of the tachykinin NK1 receptor may represent an important strategy in the treatment of patients with signs of severe envenoming and clearly deserves further studies.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Matos IM,Souza DG,Seabra DG,Freire-Maia L,Teixeira MM

doi

10.1016/s0014-2999(99)00382-9

keywords:

subject

Has Abstract

pub_date

1999-07-09 00:00:00

pages

293-300

issue

3

eissn

0014-2999

issn

1879-0712

pii

S0014299999003829

journal_volume

376

pub_type

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