Urinary Actin, as a Potential Marker of Sepsis-related Acute Kidney Injury

In our study, 17 septic, 43 sepsis-related acute kidney injury and 24 control patients were enrolled. Blood and urine samples were collected at the intensive care unit from acutely diagnosed septic and sepsis-related acute kidney injury patients at three time points (T1-3): T1: within 24 hours after admission; T2: second day morning; T3: third day morning of follow-up. Patients with malignancies needing palliative care, end-stage renal disease or kidney transplantation were excluded. Not more than one sample (venous blood, midstream spot urine) was collected from control patients. Serum and urinary actin levels were determined by quantitative Western blot. Urinary actin concentrations were expressed as µg/L, while serum actin levels were expressed as mg/L. Data were compared with laboratory and clinical parameters. Patients were categorized by the Sepsis-3 definitions and 30-day mortality data were investigated.