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[Effect of ciguatoxins on the cardiocirculatory system].
J Soc Biol. 1999; 193(6):495-504.JS

Abstract

The aim of the present review was to collect the main observations reported until now concerning the cardio-circulatory effects of polyether toxins, called ciguatoxins, which are involved in an endemic intoxication named ciguatera found in tropical and subtropical countries. Ciguatera is caused by the ingestion of fishes contaminated with the dinoflagellate Gamberdiscus toxicus. Due to both tropical fish exportation destined for food and tourism, the disease has now spread out to temperate areas. Several toxins have been isolated and purified from different fish species living in different geographical areas. They are classified into three main groups by the nature of certain cycles of their carbon skeleton. Clinical reports show evidence that ciguatera intoxication affect both electrocardiograms and blood pressure. In most cases, ciguateric intoxication mainly evoked bradycardia, hypotension, and the alteration of S-T segment in the electrocardiogram. Isolated and purified ciguatoxins strongly altered the morphology of cardiac tissue inducing swelling of the cells and alterations of cellular organelles. These toxins impair the conduction of cardiac nerves and increase the opening probability of Na+ channels in intracardiac ganglions. Depending on the concentration applied, the substances exerted either a fast positive inotropic effect or a negative inotropic effect on the contraction of mammalian atrial and ventricular cardiac muscle. These effects were attributed to a release of noradrenaline and acetylcholine from neural terminals of the autonomic nervous system present in cardiac tissue. They also exert a slow delayed inotropic effect on the contraction which has been attributed to a direct effect of the toxins on tetrodotoxin-sensitive voltage-dependent Na+ channels of cardiac membranes. Ciguatoxins depolarized the membrane of mammalian atrial and ventricular preparations and shifted the threshold of sodium current activation to more negative membrane potentials. In conclusion, the inotropic effects of ciguatoxins on cardiac tissues mainly depend on the toxin concentration sensitivity of autonomic nerve terminals, which released noradrenaline and/or acetylcholine, while the ciguatoxin-induced increase of the sodium influx could be involved in the cardiac cell swelling which coincides with reports in which ciguatoxins induced a mannitol-inhibited swelling of the Node of Ranvier.

Authors+Show Affiliations

Laboratoire d'Optique Appliquée, Unité INSERM 451, Ecole Polytechnique-ENSTA, Palaiseau, France. sauviat@enstay.ensta.fNo affiliation info available

Pub Type(s)

English Abstract
Journal Article
Review

Language

fre

PubMed ID

10783707

Citation

Marquais, M, and M P. Sauviat. "[Effect of Ciguatoxins On the Cardiocirculatory System]." Journal De La Societe De Biologie, vol. 193, no. 6, 1999, pp. 495-504.
Marquais M, Sauviat MP. [Effect of ciguatoxins on the cardiocirculatory system]. J Soc Biol. 1999;193(6):495-504.
Marquais, M., & Sauviat, M. P. (1999). [Effect of ciguatoxins on the cardiocirculatory system]. Journal De La Societe De Biologie, 193(6), 495-504.
Marquais M, Sauviat MP. [Effect of Ciguatoxins On the Cardiocirculatory System]. J Soc Biol. 1999;193(6):495-504. PubMed PMID: 10783707.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Effect of ciguatoxins on the cardiocirculatory system]. AU - Marquais,M, AU - Sauviat,M P, PY - 2000/4/28/pubmed PY - 2000/6/24/medline PY - 2000/4/28/entrez SP - 495 EP - 504 JF - Journal de la Societe de biologie JO - J Soc Biol VL - 193 IS - 6 N2 - The aim of the present review was to collect the main observations reported until now concerning the cardio-circulatory effects of polyether toxins, called ciguatoxins, which are involved in an endemic intoxication named ciguatera found in tropical and subtropical countries. Ciguatera is caused by the ingestion of fishes contaminated with the dinoflagellate Gamberdiscus toxicus. Due to both tropical fish exportation destined for food and tourism, the disease has now spread out to temperate areas. Several toxins have been isolated and purified from different fish species living in different geographical areas. They are classified into three main groups by the nature of certain cycles of their carbon skeleton. Clinical reports show evidence that ciguatera intoxication affect both electrocardiograms and blood pressure. In most cases, ciguateric intoxication mainly evoked bradycardia, hypotension, and the alteration of S-T segment in the electrocardiogram. Isolated and purified ciguatoxins strongly altered the morphology of cardiac tissue inducing swelling of the cells and alterations of cellular organelles. These toxins impair the conduction of cardiac nerves and increase the opening probability of Na+ channels in intracardiac ganglions. Depending on the concentration applied, the substances exerted either a fast positive inotropic effect or a negative inotropic effect on the contraction of mammalian atrial and ventricular cardiac muscle. These effects were attributed to a release of noradrenaline and acetylcholine from neural terminals of the autonomic nervous system present in cardiac tissue. They also exert a slow delayed inotropic effect on the contraction which has been attributed to a direct effect of the toxins on tetrodotoxin-sensitive voltage-dependent Na+ channels of cardiac membranes. Ciguatoxins depolarized the membrane of mammalian atrial and ventricular preparations and shifted the threshold of sodium current activation to more negative membrane potentials. In conclusion, the inotropic effects of ciguatoxins on cardiac tissues mainly depend on the toxin concentration sensitivity of autonomic nerve terminals, which released noradrenaline and/or acetylcholine, while the ciguatoxin-induced increase of the sodium influx could be involved in the cardiac cell swelling which coincides with reports in which ciguatoxins induced a mannitol-inhibited swelling of the Node of Ranvier. SN - 1295-0661 UR - https://www.unboundmedicine.com/medline/citation/10783707/[Effect_of_ciguatoxins_on_the_cardiocirculatory_system]_ DB - PRIME DP - Unbound Medicine ER -