NDLI: Different mechanisms for metal-induced adaptation to cadmium in the human lung cell lines A549 and H441

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Different mechanisms for metal-induced adaptation to cadmium in the human lung cell lines A549 and H441

Content Provider	Springer Nature Link
Author	Sauvageau, Josée Anne Jumarie, Catherine
Copyright Year	2013
Abstract	Sensitivity to Cd and Zn as well as the capacity to develop tolerance were characterized in human lung cells A549 and H441. In the A549 cells, a 2-fold lower LC50 was obtained for Cd compared to Zn, whereas H441 cells were similarly sensitive to both metals. H441 cells were twice as resistant to Cd as the A549 cells. Higher HSP70, but not metallothionein (MT) or glutathione (GSH) levels, could contribute to this better resistance. A 1.5- and 2-fold increase in the LC50 for Cd was obtained in the A549 cells pre-exposed to non-cytotoxic concentrations of Cd (20 μM) or Zn (40 μM) for 24 h. On the other hand, only Zn increased H441 cells’ resistance to Cd. Maximum Zn- and Cd-induced tolerances were reached as early as 3 and 12 h, respectively. Increases in MT-IIa and HSP70 messenger RNA levels were higher in A549 cells, but cycloheximide eliminated the induction of tolerance only in the H441 cells. Protein synthesis is a prerequisite for metal-induced tolerance to Cd in the H441 cells but not the A549 cells. Results obtained with l-buthionine sulfoximine revealed that GSH synthesis is not responsible for the acquired tolerance in both cell lines. However, GSH plays a critical role against Cd toxicity, and pro-oxidant conditions sensitized cells to Cd with different impacts on the metal-induced mechanisms of acquired tolerance. GSH and catalase both provide antioxidative protection, but only the stress related to low GSH content, not that resulting from catalase inhibition, may be alleviated with Zn.
Starting Page	159
Ending Page	173
Page Count	15
File Format	PDF
ISSN	07422091
Journal	Cell Biology and Toxicology
Volume Number	29
Issue Number	3
e-ISSN	15736822
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-04-13
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	A549 cells H441 cells Adaptation Cadmium Zinc Oxidative stress MT HSP70 GSH MDR1. Cell Biology Pharmacology/Toxicology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Cell Biology Health, Toxicology and Mutagenesis Toxicology

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