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2020-01-01
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ANTI-BAND 3 AND ANTI-SPECTRIN ANTIBODIES ARE INCREASED IN PLASMODIUM VIVAX INFECTION AND ARE ASSOCIATED WITH ANEMIA
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Universidade Federal de Minas Gerais. Departamento de Parasitologia. Belo Horizonte, MG, Brazil
Center for Tropical and Emerging Global Diseases. University of Georgia. Athens, GA, USA.
Universidade Federal de Minas Gerais. Departamento de Parasitologia. Belo Horizonte, MG, Brazil.
Embrapa Recursos Genéticos e Biotecnologia. Brasília, DF, Brazil.
Universidade Federal de Minas Gerais. Departamento de Parasitologia. Belo Horizonte, MG, Brazil.
Universidade Federal de Minas Gerais. Departamento de Parasitologia. Belo Horizonte, MG, Brazil.
Universidade Federal do Mato Grosso. Faculdade de Ciências Médicas. Cuiabá, MT, Brazil.
Department of Biotechnology. All India Institute of Medical Sciences. New Delhi, India.
Department of Biotechnology. All India Institute of Medical Sciences. New Delhi, India.
Fundação Oswaldo Cruz. Instituto René Rachou. Belo Horizonte, MG, Brazil.
Embrapa Recursos Genéticos e Biotecnologia. Brasília, DF, Brazil.
Universidade Federal de Minas Gerais. Departamento de Parasitologia. Belo Horizonte, MG, Brazil.
Center for Tropical and Emerging Global Diseases. University of Georgia. Athens, GA, USA.
Universidade Federal de Minas Gerais. Departamento de Parasitologia. Belo Horizonte, MG, Brazil.
Embrapa Recursos Genéticos e Biotecnologia. Brasília, DF, Brazil.
Universidade Federal de Minas Gerais. Departamento de Parasitologia. Belo Horizonte, MG, Brazil.
Universidade Federal de Minas Gerais. Departamento de Parasitologia. Belo Horizonte, MG, Brazil.
Universidade Federal do Mato Grosso. Faculdade de Ciências Médicas. Cuiabá, MT, Brazil.
Department of Biotechnology. All India Institute of Medical Sciences. New Delhi, India.
Department of Biotechnology. All India Institute of Medical Sciences. New Delhi, India.
Fundação Oswaldo Cruz. Instituto René Rachou. Belo Horizonte, MG, Brazil.
Embrapa Recursos Genéticos e Biotecnologia. Brasília, DF, Brazil.
Universidade Federal de Minas Gerais. Departamento de Parasitologia. Belo Horizonte, MG, Brazil.
Abstract
Clearance of non-infected red blood cells (nRBCs) is one of the main components of anemia associated with Plasmodium vivax malaria. Recently, we have shown that anemic patients with P. vivax infection had elevated levels of anti-RBCs antibodies, which could enhance in vitro phagocytosis of nRBCs and decrease their deformability. Using immunoproteomics, here we characterized erythrocytic antigens that are diferentially recognized by autoantibodies from anemic and non-anemic patients with acute vivax malaria. Protein spots exclusively recognized by anemic P. vivax-infected patients were identifed by mass spectrometry revealing band 3 and spectrin as the main targets. To confrm this fnding, antibody responses against these specifc proteins were assessed by ELISA. In addition, an inverse association between hemoglobin and anti-band 3 or anti-spectrin antibodies levels was found. Anemic patients had higher levels of IgG against both band 3 and spectrin than the non-anemic ones. To determine if these autoantibodies were elicited because of molecular mimicry, we used in silico analysis and identifed P. vivax proteins that share homology with human RBC proteins such as spectrin, suggesting that infection drives autoimmune responses. These fndings suggest that band 3 and spectrin are potential targets of autoantibodies that may be relevant for P. vivax malaria-associated anemia.
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