Changes in fatty acid profile of Holothuria forskali muscle following acute mercury exposure

I.  Rabeh; K.  Telahigue; T.  Hajji; C.  Fouzai; M.  El Cafsi; N.  Soudani

doi:10.3989/gya.0335201

Autores/as

I. Rabeh Laboratory of Ecology, Biology and Physiology of Aquatic organisms, Faculty of Sciences of Tunis, Univ. Tunis El Manar https://orcid.org/0000-0002-0307-473X
K. Telahigue Laboratory of Ecology, Biology and Physiology of Aquatic organisms, Faculty of Sciences of Tunis, Univ. Tunis El Manar https://orcid.org/0000-0001-8841-9911
T. Hajji BVBGR-LR11ES31, Higher Institute of Biotechnology - Sidi Thabet, Biotechpole Sidi Thabet, Univ. Manouba https://orcid.org/0000-0002-3869-8876
C. Fouzai Laboratory of Ecology, Biology and Physiology of Aquatic organisms, Faculty of Sciences of Tunis, Univ. Tunis El Manar https://orcid.org/0000-0001-7588-1859
M. El Cafsi Laboratory of Ecology, Biology and Physiology of Aquatic organisms, Faculty of Sciences of Tunis, Univ. Tunis El Manar, https://orcid.org/0000-0002-9771-1110
N. Soudani Laboratory of Ecology, Biology and Physiology of Aquatic organisms, Faculty of Sciences of Tunis, Univ. Tunis El Manar https://orcid.org/0000-0002-7652-9678

DOI:

https://doi.org/10.3989/gya.0335201

Palabras clave:

Cloruro de mercurio (HgCl2), Composición de ácidos grasos, Exposición aguda, Holothuria forskali, Índices de peroxidación lipídica, Pepino de mar

Resumen

El presente estudio tuvo como objetivo demostrar la interacción entre el mercurio (Hg), como modelo de estresor químico para el organismo acuático, y el perfil de ácidos grasos (FA) en el músculo longitudinal del pepino de mar Holothuria forskali. Para evaluar la sensibilidad de esta especie a los efectos tóxicos del Hg, los juveniles de H. forskali fueron expuestos a dosis graduales de Hg (40, 80 y 160 µg·L^-1) durante 96 h. Los resultados mostraron que después de la exposición al Hg, el perfil de FA de H. forskali respondió con una tendencia direccional anclada por el aumento en el nivel de ácidos grasos saturados y la disminución en el nivel de ácidos grasos monoinsaturados y poliinsaturados. Los cambios más prominentes en la composición de AG se registraron a la dosis más baja con una disminución notable en los niveles de ácido linoleico, araquidónico y eicosapentaenoico frente a un aumento de ácido docosahexaenoico. La aparición de un estado de estrés oxidativo inducido por la contaminación con Hg se puso de manifiesto por el aumento en los niveles de malondialdehído, peróxido de hidrógeno e hidroperóxido de lípidos. En general, la concentración más baja de mercurio ejerció efectos más obvios sobre el metabolismo de los lípidos, lo que sugiere que los cambios en la composición de los ácidos grasos pueden actuar como un biomarcador anterior para evaluar la toxicidad del mercurio en esta especie de importancia ecológica y económica.

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