GAS6/sAXL ratio correlates with National Institutes of Health Stroke Scale (NIHSS) and infarction size in patients with acute ischemic stroke

Abstract

Background & Objective: Ischemic stroke is the leading cause of death and long-term disability worldwide. In patients with ischemic stroke, both cell loss and inflammation are observed. GAS6/sAXL signaling is effective in both inflammation and clearance of dead/dying cells. This study investigated the GAS6/sAXL pathway and its role in patients with acute stroke. Specifically, we evaluated whether GAS6/sAXL was associated with stroke severity and infarct volume. Methods: This study involved 53 patients with acute ischemic stroke (AIS) and 49 healthy controls. GAS6 and sAXL proteins were collected in the first 24 hours in the acute stroke. NIHSS scores, GCS, and demographic data of the patients at the time of admission to the hospital were recorded. The infarct area was calculated using cranial magnetic resonance imaging. Results: Mean age of the patients was 64±12 years, 60% were female. HDL was lower in AIS group (40.5±13.01 mg/dl) than in the control group (55.4±14.9 mg/ dl) (p<0.05). The GAS6 levels of patients with ischemic stroke (30.58 [1.58-162.33] ng/dL) were significantly lower than the control group (83.33 [10.71-181.96] ng/dL) (p < 0.001). There was a significant difference in the GAS6/sAXL ratio between the AIS (8.60 [0.55-48] ng/mL) and control groups (14.78 [1.82-53.71] ng/mL) (p < 0.001). The serum GAS6 level and MR infarct area was positively correlated (r = 0.381 p = 0.005). The GAS6/sAXL ratio was positively correlated with the NIHSS and infarct area (p = 0.004). The GAS6/sAXL ratio and GCS showed a negative correlation (p = 0.001). Conclusion: Plasma GAS6 levels were positively correlated with infarct size, and the GAS6/sAXL ratio was positively correlated with the NIHSS score and infarct area in patients with AIS. Plasma GAS levels and GAS6/sAXL ratio can be used as an indicator of severity of AIS.