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Metal brain bioaccumulation and neurobehavioral effects on the wild rodent Liomys irroratus inhabiting mine tailing areas

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Abstract

Ecotoxicological studies are necessary in order to evaluate the effects of environmental exposure of chemicals on wild animals and their ecological consequences. Particularly, neurobehavioral effects of heavy metal elements on wild rodents have been scarcely investigated. In the present study, we analyzed the effect of metal bioaccumulation (Pb, As, Mg, Ni, and Zn) in the brain and in the liver on exploratory activity, learning, memory, and on some dopaminergic markers in the wild rodent Liomys irroratus living inside mine tailings, at Huautla, Morelos, Mexico. We found higher Pb concentration but lower Zn in striatum, nucleus accumbens, midbrain, and hippocampus in exposed animals in comparison to rodents from the reference site. Exposed rodents exhibited anxious behavior evaluated in the open field, while no alterations in learning were found. However, they displayed slight changes in the memory test in comparison to reference group. The neurochemical evaluation showed higher levels of dopamine and 5-hydroxyindolacetic acid in midbrain, while lower levels of metabolites dihydroxyphenyl acetic acid and homovanillic acid in striatum of exposed rodents. In addition, mRNA expression levels of dopaminergic D2 receptors in nucleus accumbens were lower in animals from the mining zone than in animals from the reference zone. This is the first study that shows that chronic environmental exposure to metals results in behavioral and neurochemical alterations in the wild rodent L. irroratus, a fact that may comprise the survival of the individuals resulting in long-term effects at the population level. Finally, we suggest the use of L. irroratus as a sentinel species for environmental biomonitoring of mining sites.

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Acknowledgments

The authors would like to thank Dr. Evangelina Delgado-González and Dr. Rocio Brenda Anguiano Serrano, Evodio Rendón Alquicira, Lucas Lucio Arredondo Ortega, Amado García Sánchez, Miguel Santoyo Martínez, Juan Ramírez Zamora, Carlos Ángel Quintana Ocampo, Carlos Vergara Allende, Joel Daniel Castañeda Espinosa, Fidel Ocampo Bautista, Natalia De la Cruz Guarneros, Janet Esteves Aguilar, Marcos Rosas Ramírez, Miguel Ángel Galván Ramírez, Anaid Fuentes Reza, and Dania Rebolledo Salinas for their technical assistance. Dr. Isela Hernández Plata was a CONACyT posdoctoral fellow (fellowship 164300) at the Universidad Autónoma del Estado de Morelos. This research was supported by CONACYT grant # 240414 to P. Mussali-Galante and #251510 to V.M. Rodríguez.

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Correspondence to Patricia Mussali-Galante.

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Responsible Editor: Mohamed M. Abdel-Daim

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Hernández-Plata, I., Rodríguez, V.M., Tovar-Sánchez, E. et al. Metal brain bioaccumulation and neurobehavioral effects on the wild rodent Liomys irroratus inhabiting mine tailing areas. Environ Sci Pollut Res 27, 36330–36349 (2020). https://doi.org/10.1007/s11356-020-09451-3

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  • DOI: https://doi.org/10.1007/s11356-020-09451-3

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