Pathogenic mechanisms of sand tampan toxicoses induced by the tick, Ornithodoros savignyi

被引：43

作者：

Mans, BJ

Steinmann, CML

Venter, JD

Louw, AI

Neitz, AWH ^{[1
]}

机构：

[1] Univ Pretoria, Dept Biochem, ZA-0002 Pretoria, South Africa

[2] Univ Pretoria, Dept Physiol, ZA-0002 Pretoria, South Africa

来源：

TOXICON | 2002年 / 40卷 / 07期

基金：

新加坡国家研究基金会;

关键词：

cardin; paralysis; Ornithodoros savignyi; ticks; toxicoses; toxins;

D O I：

10.1016/S0041-0101(02)00098-3

中图分类号：

R9 [药学];

学科分类号：

1007 ;

摘要：

The tick, Ornithodoros savignyi has been implicated in inducing paralysis and tampan toxicosis. In this study, a basic toxin (TSGP4) was identified and the presence of an acidic toxin (TSGP2) was confirmed. Both basic and acidic toxins were more lethal than previously described, with TSGP4 (34 mug) and TSGP2 (24 mug) causing mortality of adult mice within 30 min. Pathological effects on the cardiac system, notably of salivary gland extract on an isolated rat heart perfusion system and of purified toxins on mouse electrocardiogram patterns could be observed. TSGP4 caused Mobitz type ventricular block, while TSGP2 induced ventricular tachycardia. Conversely, fractions from reversed phase high performance liquid chromatography preparations caused paralysis-like symptoms of the limbs after only 48 It. The toxins also differ from previously described tick paralysis toxins in terms of molecular behavior and properties. These results indicate that tampan toxicoses and tick paralysis are unrelated pathogenic phenomena. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1007 / 1016

页数：10

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