Abstract
A proposed mechanism for the As-induced inhibition of cell proliferation is the inhibition of IL-2 secretion. However, the effects of arsenite on IL-2 mRNA expression or on the ERK pathway in activated-T cells have not yet been described. We examined the effect of arsenite on IL-2 mRNA expression, cell activation and proliferation in PHA-stimulated murine lymphocytes. Arsenite (1 and 10 μM) decreased IL-2 mRNA expression, IL-2 secretion and cell proliferation. Arsenite (10 μM) strongly inhibited ERK-phosphorylation. However, the partial inhibition (50%) of IL-2 mRNA produced by 1 μM, consistent with the effects on IL-2 secretion and cell proliferation, could not be explained by the inhibition of ERK-phosphorylation, which was not affected at this concentration. The inhibition of IL-2 mRNA expression caused by 1 μM could be associated to effects on pathways located downstream or parallel to ERK. Arsenite also decreased early activation (surface CD69+ expression) in both CD4+ and CD8+, and decreased total CD8+ count without significantly affecting CD4+, supporting that the cellular immune response mediated by cytotoxic T cells is an arsenic target. Thus, our results suggest that arsenite decreases IL-2 mRNA levels and T-cell activation and proliferation. However, further studies on the effects of arsenite on IL-2 gene transcription and IL-2 mRNA stability are needed.
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Acknowledgments
We thank Dr. Mariano E. Cebrian for helpful discussion and critical reading of the manuscript. We appreciate the technical assistance of VH. Rosales and V. Nuñez. This work was partially supported by the Mexican Council for Science and Technology (Conacyt-34508-M and Conacyt-42297-M).
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Conde, P., Acosta-Saavedra, L.C., Goytia-Acevedo, R.C. et al. Sodium arsenite-induced inhibition of cell proliferation is related to inhibition of IL-2 mRNA expression in mouse activated T cells. Arch Toxicol 81, 251–259 (2007). https://doi.org/10.1007/s00204-006-0152-7
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DOI: https://doi.org/10.1007/s00204-006-0152-7