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Background: As a member of the tumor necrosis factor superfamily (TNFSF), LIGHT (TNFSF14) is expressed by a variety of immune cells and exists in membrane-bound and soluble forms. Recently, LIGHT was found to be associated with platelets and released upon activation. Activation of endothelia cells by recombinant LIGHT protein results in pro-inflammatory and pro-thrombotic changes. Several studies have reported increased plasma levels of LIGHT in patients with stroke and cardiovascular diseases. However, the form-associated roles of LIGHT in ischemic atherosclerotic stroke remain unclear. Mater?als and Methods: In this study, the platelet LIGHT expression and soluble LIGHT protein were analyzed by flow cytometry and enzyme-linked immunosorbent assay (ELISA) in peripheral blood of patients with acute ischemic atherosclerotic stroke, asymptomatic carotid stenosis (ACS) and normal controls. RESULTS: During the initial 24 h after onset, the stroke patients had decreased LIGHT expression on their platelets (5.9% ± 4.9%) and increased plasma LIGHT levels (36.1 ± 21.0 pg/ml) as compared with normal controls (9.5% ± 3.0%, p p p = 0.0247). Conclus?ons: The dysregulated LIGHT expression reflects a persistent chronic inflammatory response that may have been induced during early stages of ischemic atherosclerotic stroke. Our results strongly suggest distinctive roles of form-associated LIGHT in the disease pathogenesis: platelet-associated LIGHT may contribute to formation and development of carotid atherosclerotic plaque, probably involving plaque destabilization, while soluble LIGHT may predominantly functions as a pro-inflammatory cytokine in the inflammatory process.

Elevated Plasma Levels but Decreased Platelet-Associated Expression of LIGHT in Patients with Acute Atherothrombotic Stroke