Abstract
Human diploid fibroblasts (HDFs) exposed to subcytotoxic concentrations of oxidative or stressful agents, such as hydrogen peroxide, tert-butylhydroperoxide, or ethanol, undergo stress-induced premature senescence (SIPS). This condition is characterized by the appearance of replicative senescence biomarkers such as irreversible growth arrest, increase in senescence-associated β-galactosidase (SA β-gal) activity, altered cell morphology, and overexpression of several senescence-associated genes. Copper is an essential trace element known to accumulate with ageing and to be involved in the pathogenesis of some age-related disorders. Past studies using either yeast or human cellular models of ageing provided evidence in favor of the role of intracellular copper as a longevity modulator. In the present study, copper ability to cause the appearance of senescent features in HDFs was assessed. WI-38 fibroblasts exposed to a subcytotoxic concentration of copper sulfate presented inhibition of cell proliferation, cell enlargement, increased SA β-gal activity, and mRNA overexpression of several senescence-associated genes such as p21, apolipoprotein J (ApoJ), fibronectin, transforming growth factor β-1 (TGF β1), insulin growth factor binding protein 3, and heme oxygenase 1. Western blotting results confirmed enhanced intracellular p21, ApoJ, and TGF β1 in copper-treated cells. Thus, similar to other SIPS-inducing agents, HDF exposure to subcytotoxic concentration of copper results in premature senescence. Further studies will unravel molecular mechanisms and the biological meaning of copper-associated senescence and lead to a better understanding of copper-related disorder establishment and progression.
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Acknowledgments
L. Matos would like to acknowledge “Fundação para a Ciência e Tecnologia” for her PhD grant [SFRH/BD/61820/2009].
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Effect of 500 μM copper sulfate on mRNA transcript levels of several senescence-associated genes. The incubation of WI-38 fibroblasts with the lower cytotoxic copper concentration (500 μM) resulted in non-significant variations on p21, ApoJ, TGF β1, fibronectin, and HO-1 gene expression, when compared with controls. In addition, IGFBP3 mRNA levels were 1.7-fold increased in 500 μM CuSO4-treated cells, comparing with control cells. When compared with the consistent upregulation of the several senescence-associated genes observed for cells exposed to 250 μM copper, gene expression variations obtained with 500 μM copper sulfate were senseless, suggesting that the transcriptional machinery of these cells were seriously compromised due to the toxic effects of the dose. Data are presented as mean ± SEM from at least three independent experiments. *p < 0.05 when compared with control (JPEG 14 kb)
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Western blot analysis of fibronectin, p21, ApoJ, and TGF β1 protein levels in cells submitted to 500 μM copper sulfate. a Representative blots for the detection of the different proteins. Tubulin was used as loading control. b The resulting bands were quantified using densitometric analysis of the different signals. Protein levels of p21 were found significantly increased (3.7-fold) in WI-38 fibroblasts treated with 500 μM copper sulfate for 24h, when compared with controls. Both fibronectin and TGF β1 intracellular protein levels were decreased, and ApoJ protein content did not alter after exposure to the cytotoxic dose of copper, when compared with control cells. These inconsistent protein variations may originate from cellular metabolic alterations reflecting the cytotoxic effects of copper concentration used. Data are expressed as mean ± SEM from at least three independent experiments. *p < 0.05; **p < 0.01 when compared with control (TIFF 9255 kb) (JPEG 22 kb)
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Matos, L., Gouveia, A. & Almeida, H. Copper ability to induce premature senescence in human fibroblasts. AGE 34, 783–794 (2012). https://doi.org/10.1007/s11357-011-9276-7
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DOI: https://doi.org/10.1007/s11357-011-9276-7