Macrophage inhibitory cytokine‐1 (MIC‐1/GDF15): a new marker of all‐cause mortality

Macrophage inhibitory cytokine‐1 (MIC‐1/GDF15) is a member of the TGF‐b superfamily, previously studied in cancer and inflammation. In addition to regulating body weight, MIC‐1/GDF15 may be used to predict mortality and/or disease course in cancer, cardiovascular disease (CVD), chronic renal and heart failure, as well as pulmonary embolism. These data suggested that MIC‐1/GDF15 may be a marker of all‐cause mortality. To determine whether serum MIC‐1/GDF15 estimation is a predictor of all‐cause mortality, we examined a cohort of 876 male subjects aged 35–80 years, selected from the Swedish Population Registry, and followed them for overall mortality. Serum MIC‐1/GDF15 levels were determined for all subjects from samples taken at study entry. A second (independent) cohort of 324 same‐sex twins (69% female) from the Swedish Twin Registry was similarly examined. All the twins had telomere length measured and 183 had serum levels of interleukin 6 (IL‐6) and C‐reactive protein (CRP) available. Patients were followed for up to 14 years and had cause‐specific and all‐cause mortality determined. Serum MIC‐1/GDF15 levels predicted mortality in the all‐male cohort with an adjusted odds ratio (OR) of death of 3.38 (95%CI 1.38–8.26). This finding was validated in the twin cohort. Serum MIC‐1/GDF15 remained an independent predictor of mortality when further adjusted for telomere length, IL‐6 and CRP. Additionally, serum MIC‐1/GDF15 levels were directly correlated with survival time independently of genetic background. Serum MIC‐1/GDF15 is a novel predictor of all‐cause mortality.

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