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Evaluation of hydroxychloroquine effect on the expression of tissue factor in inflammatory monocytes

Grant number: 16/23429-0
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): April 01, 2017
Effective date (End): December 31, 2017
Field of knowledge:Health Sciences - Medicine
Principal Investigator:Joyce Maria Annichino-Bizzacchi
Grantee:Cleyse Maria Santos Messias
Host Institution: Centro de Hematologia e Hemoterapia (HEMOCENTRO). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil


Monocytes are large cells formed in bone marrow mononuclear forming part of the system. They play a key role in innate immunity by stimulating cell reaction (inflammation), and acting in response to microorganisms. In normal monocytes express in their few surface amounts of tissue factor (TF), however, in pathological situations, this expression increases, exposing the FT to blood flow, initiating the coagulation cascade, which may result in the formation of thrombi. The hydroxychloroquine (HCQ) is an antimalarial drug that is currently used in the treatment of autoimmune diseases such as systemic lupus erythematosus (SLE) and rheumatoid arthritis. Several clinical studies have shown that HCQ may decrease the risk of thrombosis in patients with SLE, however, their mechanisms are not quite clear. Thus, this study aims to evaluate the HCQ can control the inflammatory activity of monocytes by regulating the FT protein expression on the surface of these cells and inhibition of transcription of the FT gene in order to better understand the mechanisms used by this drug, which may have implications for the prophylaxis of thrombotic events in patients with autoimmune diseases such as SLE. (AU)

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