Categoría | Antibióticos

La viabilidad de los espermatozoides se reduce en las crias de escorpiones tratados con tetraciclina

 

En un artículo publicado por investigadores de la Universidad de Nevada, informaron que pseudoescorpiones machos tratados con el antibiótico tetraciclina sufrieron la viabilidad de los espermatozoides y también redujeron significativamente este efecto tóxico a sus hijos sin tratar. Los autores sugieren que un efecto similar podría ocurrir en los seres humanos y otras especies.

Este es el primer estudio en mostrar un efecto transgeneracional de los antibióticos. Es decir, la tetraciclina tiene un efecto perjudicial significativo en la función de la reproductivad masculina y la viabilidad de los espermatozoides de los pseudoescorpiones. Esta reducción de la viabilidad fue de hasta un 25 por ciento y lo más sorprendente es que el efecto se transmite a la siguiente generación.

La investigación consistió en un estudio de tres generaciones del seudoescorpión, Cordylochernes scorpioides, un pequeño arácnido tipo escorpión. Para el control de las influencias genéticas, en la primera generación, los hermanos y las hermanas de cada uno de las 21 crías fueron tratados con dosis semanales de tetraciclina desde el nacimiento hasta la edad adulta o fueron criados como controles no tratados. Las generaciones posteriores no fueron tratados con tetraciclina. El antibiótico no tuvo ningún efecto en el número de espermatozoides masculinos, ni el tamaño del cuerpo femenino ni tampoco en la reproducción femenina.

La tetraciclina es un antibiótico de amplio espectro se usa comúnmente en la producción animal, la terapia antimicrobiana, y para los tratamientos de artrópodos  infectados con bacterias endosimbiontes como Wolbachia. A pesar de más de seis décadas de su uso terapéutico y agrícola que ha dado lugar a la evolución de la resistencia bacteriana generalizada, la tetraciclina es todavía usado como aditivo en la alimentación animal y como una terapia antimicrobiana accesible en los países en desarrollo.

 

Referencia

Jeanne A. Zeh, Melvin M. Bonilla, Angelica J. Adrian, Sophia Mesfin, David W. Zeh. From father to son: transgenerational effect of tetracycline on sperm viabilityScientific Reports, 2012; 2 DOI:10.1038/srep00375

Artículo escrito por:

- quién ha escrito 581 artículos en bioBlogia.

Francisco P. Chávez Profesor Asistente, Laboratorio de Microbiología Molecular y Biotecnología Departamento de Biología Facultad de Ciencias Universidad de Chile

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Francisco P. Chávez Ph.D
Departamento de Biología
Facultad de Ciencias
Universidad de Chile
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