Mechanism of cell toxicity induced by digitalis compounds. Study with ouabain [Mecanismo de toxicidad celular inducida por digitálicos. Estudio con ouabaína]
Por:
Ramírez Ortega M.D.C., Maldonado Lagunas V., Meléndez Zajgla J., Zarco Olvera G., Avila Casados Ma.D.C., Suárez Munguía J., Pastelín Hernández G.
Publicada:
1 ene 2002
Resumen:
The toxic effect of digitalis compounds at cell level produces an intracellular Ca2+overload and a decrease in intracellular concentrations of K+. Since Ca2+ and K+ are critical modulators of life and death, the purpose of this study was to explore the cell death pathway activated through the ionic imbalance provoked by digitalis intoxication. We present results of cell toxicity in a study performed with ouabain acting on a HeLa cells culture and on guinea pig heart myocites under ouabain intoxication. Results: In tissue culture, ouabain produced inhibition of cell viability in a time and dose dependent manner. Through ethidium-bromide staining, nuclear condensation and fragmentation were observed. The electrophoretic analysis of nuclear DNA in agarose gel showed a degradation pattern characteristic of apoptosis. In histologic sections of guinea pig heart under ouabain intoxication (50-60% of lethal doses), in situ cell death was detected by in situ DNA TUNEL labeling. We conclude that the electrical and physiologic imbalance produced by toxic doses of ouabain activates mechanisms that cause cell death via apoptosis in heart myocites and fast growing cells.
Filiaciones:
Ramírez Ortega M.D.C.:
Departamento de Farmacología, Inst. Nac. Cardiol. Ignacio Chavez, Juan Badiano No. 1, Col. Seccion XVI, Tlalpan, México D. F. 14080, Mexico
Maldonado Lagunas V.:
Departamento de Farmacología, Inst. Nac. Cardiol. Ignacio Chavez, Juan Badiano No. 1, Col. Seccion XVI, Tlalpan, México D. F. 14080, Mexico
Meléndez Zajgla J.:
Departamento de Farmacología, Inst. Nac. Cardiol. Ignacio Chavez, Juan Badiano No. 1, Col. Seccion XVI, Tlalpan, México D. F. 14080, Mexico
Zarco Olvera G.:
Departamento de Farmacología, Inst. Nac. Cardiol. Ignacio Chavez, Juan Badiano No. 1, Col. Seccion XVI, Tlalpan, México D. F. 14080, Mexico
Avila Casados Ma.D.C.:
Departamento de Farmacología, Inst. Nac. Cardiol. Ignacio Chavez, Juan Badiano No. 1, Col. Seccion XVI, Tlalpan, México D. F. 14080, Mexico
Suárez Munguía J.:
Departamento de Farmacología, Inst. Nac. Cardiol. Ignacio Chavez, Juan Badiano No. 1, Col. Seccion XVI, Tlalpan, México D. F. 14080, Mexico
Pastelín Hernández G.:
Departamento de Farmacología, Inst. Nac. Cardiol. Ignacio Chavez, Juan Badiano No. 1, Col. Seccion XVI, Tlalpan, México D. F. 14080, Mexico
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