TAP-SSL5 FUNCTIONS AS AN ANTICOAGULANT AND ANTI-INFLAMMATORY PROTEIN TO INHIBIT THROMBOSIS IN RAT AND ATTENUATE ATHEROSCLEROSIS IN APOE-KNOCKOUT MOUSE. (8th October 2012)

• Record Type: Journal Article
• Authors: Qu, Xiaolong; Fang, Zhaofei; Li, Min; Huang, Dexing; Hu, Houyuan
• Is Part Of: Heart. Volume 98(2012)Supplement 2
• Page Start: E130
• Page End: E131
• Publication Date: 2012-10-08
• Subjects: Heart -- Diseases -- Treatment -- Periodicals; Cardiology -- Periodicals; 616.12
• DOI: 10.1136/heartjnl-2012-302920c.9
• Languages: English
• ISSNs: 1355-6037

Abstract

Abstract : Objectives: This study aims to inhibit the inflammatory response and thrombosis in atherosclerotic lesions, by using the staphylococcal superantigen-like protein-5 (SSL5) to inhibit neutrophil activation, and tick anticoagulant peptide (TAP) to inhibit factor Xa (FXa) activation. To achieve this, we made a novel fusion protein TAP-SSL5 and tesed its dual anticoagulant and anti-inflammatory properties.t Methods: We put six flexible amino acids sequence between TAP and SSL5 genes as a linker. The polycistronic fragment was constructed and then subcloned into a pET22b(+) expression vector. The binding ability of TAP-SSL5 to P-selectin glycoprotein ligand-1(PSGL-1) on leukocytes was verified by flow cytometry. The binding of TAP-SSL5 to PSGL-1 inhibited the adhesion of leukocytes to P-selectin-coated surface. FXa activity was determined by chromogenic substrate assay. Results: We have observed that TAP-SSL5 inhibited FXa activity in a concentration-dependent manner and TAP-SSL5 reduced ferric chloride-induced thrombosis in the inferior vena cava of rat. In a high-fat diet induced atherosclerotic model by using ApoE-knockout (ApoE −/− ) mouse, male ApoE −/− mice were grouped to receive intraperitoneal treatment with either TAP-SSL5 (3 mg/kg/day), SSL5 (2 mg/kg/day) or vehicle separately. After 12 weeks of the respective treatment, we have observed that TAP-SSL5 reduced the atherosclerotic plague formation by 48% compared to controls. We also found TAP-SSL5 could down-regulate several kinds of inflammatory cytokine expressions in vascular wall which were detected by mouse inflammatory antibody array. Conclusions: TAP-SSL5 fusion protein has promising anti-inflammatory and anti-thrombosis properties, and it acquires the potential for the prevention of atherosclerotic lesion and thrombus formation.