Toxicidad de los aminoglicósidos (AGs) sobre el tejido óseo craneofacial de larvas de pez cebra Danio rerio
nº47 [Julio 16 - Septiembre 16] Retel07/07/2016
Álvarez M., 1 Rivas J., Perdomo L., Navarro E., Arias M., Hernández C.
Sección de Microscopia, Instituto Anatómico “José Izquierdo”, Facultad de Medicina, Universidad Central de Venezuela. Caracas-Venezuela, 01053.
Correspondencia:1alvarezmenator@gmail.com
Correspondencia:1alvarezmenator@gmail.com
Resumen
Los Aminoglicósidos, AG,son un grupo de antibióticos ampliamente conocidos por su acción bactericiday tóxica, cuyo efecto sobre el tejido óseo hasta el momento, ha sido poco estudiado. La investigación tuvo como objetivo evaluar la toxicidad inducida por Netilmicina, Gentamicina y Amikacina, así como la posible acción osteotoxica vinculada con los mismos, en el modelo larvario de pez cebra Danio rerio. Poblaciones larvarias de 5 días post-fertilización, fueron seleccionadas al azar y tratadas con concentraciones conocidas de AGs, durante 24, 48 y 72 horas, respectivamente. Se determinó la letalidad de cada AGs, expresada como porcentaje de mortalidad en función de la concentración y tiempo de exposición. Adicionalmente, se describieron los cambios morfo-funcionales inducidos por la Concentración Toxica Cincuenta, CT50. Posteriormente, la población de larvas, control y tratadas con CT50, fueron coloreadas con Rojo de Alizarina (RA) para establecer, a través de cambios en la intensidad de la fluorescencia del colorante, la posible acción de los AGs sobre el sistema óseo. Los AGs, presentaron una acción toxica progresiva dependiente de la concentración y el tiempo de exposición. La torsión troncal resulto predomínate con el uso de Netilmicina y Gentamicina, mientras que la presencia de coágulos a nivel cardiaco, la fue para Amikacina. Los elementos óseos del esqueleto craneofacial de las larvas tratadas, mostraron una reducción en la intensidad del marcaje con RA, con cambios en el histograma de densidad, en comparación con los controles. Los resultados sugieren un daño sobre los elementos óseos que conforman el esqueleto craneofacial de las larvas, posiblemente vinculado con un proceso de desmineralización promovido por estos AGs. Dichos resultados abren un camino hacia la inclusión de la acción osteotoxica, como un severo daño a considerar, durante la aplicación de estos antibióticos.
Palabras claves: Aminoglicósidos, antibióticos, osteotóxicidad, rojo de alizarina, desmineralización, pez cebra Danio rerio.
Descargar Archivo PDF (765 KB)
Palabras claves: Aminoglicósidos, antibióticos, osteotóxicidad, rojo de alizarina, desmineralización, pez cebra Danio rerio.
Descargar Archivo PDF (765 KB)
Summary
Aminoglycosides (GAs) toxicity on craniofacial bone tissue of larval zebrafish Danio rerio
Aminoglycosides (GAs) are a group of antibiotics known for their bactericidal and toxic action, whose effect on bone tissue so far, has been rarely studied. The aim of this research was to evaluate the toxicity induced by the Netilmicine, Gentamicin and Amikacin, as well as the possible osteotoxicity action associated with them,within the larval Zebrafish Danio rerio model.Larval populations of 5 days post-fertilization were randomly selected and treated with known concentrations of GAs for 24, 48 and 72 hours, respectively. Lethality of each GAs was determined in terms of percentage of mortality as a function depending of the concentration and time exposure. Additionally, the morpho-functional changes induced by toxic the concentration fifty (TC50) were described. The population of larvae, control group and treated with TC50, were stained with Alizarin Red (RA) in order to establish, through changes in the fluorescence intensity of the dye, the possible action of GAs on the skeletal system. GAs presented a progressive differential toxic action, depending on the concentration and exposure time. The backbone torsion turned out to be predominantwhen using Netilmicin and Gentamicin, as did the presence of clots at the cardiac level when using Amikacin. Bone elements of the craniofacial skeleton of treated larvae ofZebrafishDanio rerio, showed a reduction in the intensity of RA staining, with changes in the density histogram, in comparison to controls. The results suggest possible damage of bone elements of the craniofacial skeletonof the larvae, possibly linked with a demineralization process promoted by these GAs. These results open a path to the addition of osteotoxicity action as another source of severe damage to be considered during the application of these antibiotics.
Keywords: Aminoglycosides, antibiotics, osteotoxicity, alizarin red, demineralization, Zebrafish Danio rerio.
Download PDF (765 KB)
Aminoglycosides (GAs) are a group of antibiotics known for their bactericidal and toxic action, whose effect on bone tissue so far, has been rarely studied. The aim of this research was to evaluate the toxicity induced by the Netilmicine, Gentamicin and Amikacin, as well as the possible osteotoxicity action associated with them,within the larval Zebrafish Danio rerio model.Larval populations of 5 days post-fertilization were randomly selected and treated with known concentrations of GAs for 24, 48 and 72 hours, respectively. Lethality of each GAs was determined in terms of percentage of mortality as a function depending of the concentration and time exposure. Additionally, the morpho-functional changes induced by toxic the concentration fifty (TC50) were described. The population of larvae, control group and treated with TC50, were stained with Alizarin Red (RA) in order to establish, through changes in the fluorescence intensity of the dye, the possible action of GAs on the skeletal system. GAs presented a progressive differential toxic action, depending on the concentration and exposure time. The backbone torsion turned out to be predominantwhen using Netilmicin and Gentamicin, as did the presence of clots at the cardiac level when using Amikacin. Bone elements of the craniofacial skeleton of treated larvae ofZebrafishDanio rerio, showed a reduction in the intensity of RA staining, with changes in the density histogram, in comparison to controls. The results suggest possible damage of bone elements of the craniofacial skeletonof the larvae, possibly linked with a demineralization process promoted by these GAs. These results open a path to the addition of osteotoxicity action as another source of severe damage to be considered during the application of these antibiotics.
Keywords: Aminoglycosides, antibiotics, osteotoxicity, alizarin red, demineralization, Zebrafish Danio rerio.
Download PDF (765 KB)