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• W1985087373 endingPage "149" @default.
• W1985087373 startingPage "140" @default.
• W1985087373 abstract "Cobalt-chromium (Co-Cr) alloy metal-on-metal hip resurfacing is increasingly common among younger more active patients suffering from osteoarthritis. Recent reports have increased awareness of metal ions leaching from metallic articulations; this ion exposure may have adverse effects on the immune system. As previous studies reported alterations in lymphocyte number and function in patients with Co-Cr implants, we investigated effects of clinically relevant concentrations of Cr(6+) and Co(2+) on primary human lymphocytes in vitro. Here, both resting and activated (anti-CD3 ± anti-CD28 antibodies) primary human lymphocytes were exposed to Cr(6+) or Co(2+) (0.1-100 µM). Following 24 or 48 h of exposure, cell viability, proliferation, cytokine [interferon-γ (IFNγ and interleukin-2 (IL-2)] release, and apoptosis (with and without pre-treatment of cells with a caspase-3 inhibitor) were assessed. Exposure to 10 and 100 µM Cr(6+) significantly decreased cell viability and increased apoptosis in both resting and activated lymphocytes. Cell proliferation and cytokine release were also significantly reduced in activated lymphocytes following exposure. The exposure of resting lymphocytes to 100 µM Co(2+) resulted in significant decreases in cell viability accompanied by a significant increase in apoptosis. Activated lymphocytes also showed this response after exposure to 100 µM Co(2+); in fact, activated cells were significantly more sensitive to Co(2+) toxicity. Exposure to 10 µM Co(2+) led to significant decreases in cell proliferation and cytokine release, but no significant increase in apoptosis, in activated cells. The results indicate that exposure to high concentrations of metal ions initiate apoptosis that results in decreased lymphocyte proliferation. IL-2 release is inhibited by both metal ions at concentrations that are not overtly toxic. However, metal ion concentrations not directly cytotoxic to lymphocytes may affect events at a molecular level, thereby impeding lymphocyte proliferation. Hence, this may contribute to altered immune system function in patients with Co-Cr implants." @default.
• W1985087373 created "2016-06-24" @default.
• W1985087373 creator A5045936338 @default.
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• W1985087373 date "2011-03-29" @default.
• W1985087373 modified "2023-10-14" @default.
• W1985087373 title "Effect of chromium and cobalt ions on primary human lymphocytes<i>in vitro</i>" @default.
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• W1985087373 doi "https://doi.org/10.3109/1547691x.2011.553845" @default.
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