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- W2008191556 abstract "Background Interleukin (IL)-6, an integral mediator of the physiologic acute phase response to injury, has been associated with adverse postinjury complications when present in excessive concentrations. The precise role of IL-6 is unclear, but may involve exacerbation of polymorphonuclear neutrophil leukocytes (PMN)-mediated hyperinflammation. We have shown that IL-6 delays PMN apoptosis, thereby inhibiting the resolution of inflammation. More recently we have found that IL-6 stimulates PMNs to generate platelet-activating factor (PAF). Given the evidence for PAF involvement in postinjury hyperinflammation, we hypothesized that IL-6 delayed apoptosis via a mechanism involving PAF. Methods PMNs were isolated from healthy human donors using plasma-Percoll gradients and were cultured in enriched RPMI 1640 media at 2 X 107 PMNs/mL for 24 hours (37degreesC, 5% CO2). Subgroups were treated with IL-6 (0.1-10 ng/mL) or PAF (0.1-10 ng/mL) or pretreated with the PAF receptor antagonist WEB 2170 (20 microM) before IL-6 or PAF. Morphologic assessment and quantitation of apoptosis was performed with acridine orange/ethidium bromide stain. Results Both IL-6 and PAF suppressed PMN apoptosis. Pretreating PMNs with WEB 2170 abrogated the effects of IL-6 as well as PAF. Conclusion Interleukin-6 delays PMN apoptosis via a mechanism involving PAF. These observations may help elucidate the mechanisms of IL-6 and PAF in mediating postinjury hyperinflammation and secondary organ dysfunction, ultimately leading to effective therapeutic targets in patients at risk for multiple organ failure." @default.
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- W2008191556 date "1996-04-01" @default.
- W2008191556 modified "2023-10-07" @default.
- W2008191556 title "Interleukin-6 Delays Neutrophil Apoptosis via a Mechanism Involving Platelet-Activating Factor" @default.
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- W2008191556 doi "https://doi.org/10.1097/00005373-199604000-00009" @default.
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