1887

Abstract

Although arsenic is notoriously poisonous to life, its utilization in therapeutics brings many benefits to human health, so it is therefore essential to discover the molecular mechanisms underlying arsenic stress responses in eukaryotic cells. Aiming to determine the contribution of Ca signalling pathways to arsenic stress responses, we took advantage of the use of as a model organism. Here we show that Ca enhances the tolerance of the wild-type and arsenic-sensitive strains to arsenic stress in a Crz1-dependent manner, thus providing the first evidence that Ca signalling cascades are involved in arsenic stress responses. Moreover, our results indicate that arsenic shock elicits a cytosolic Ca burst in these strains, without the addition of exogenous Ca sources, strongly supporting the notion that Ca homeostasis is disrupted by arsenic stress. In response to an arsenite-induced increase of Ca in the cytosol, Crz1 is dephosphorylated and translocated to the nucleus, and stimulates CDRE-driven expression of the reporter gene in a Cnb1-dependent manner. The activation of Crz1 by arsenite culminates in the induction of the endogenous genes and . Taken together, these data establish that activation of Ca signalling pathways and the downstream activation of the Crz1 transcription factor contribute to arsenic tolerance in the eukaryotic model organism .

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2012-09-01
2020-08-11
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