Type I Interferon Transcriptional Signature in Neutrophils and Low-Density Granulocytes Are Associated with Tissue Damage in Malaria

• Main Authors: Bruno Coelho Rocha, Pedro Elias Marques, Fabiana Maria de Souza Leoratti, Caroline Junqueira, Dhelio Batista Pereira, Lis Ribeiro do Valle Antonelli, Gustavo Batista Menezes, Douglas Taylor Golenbock, Ricardo Tostes Gazzinelli
• Format: Article
• Language: English
• Published: Elsevier 2015-12-01
• Series: Cell Reports
• Online Access: http://www.sciencedirect.com/science/article/pii/S2211124715014047

Neutrophils are the most abundant leukocyte population in the bloodstream, the primary compartment of Plasmodium sp. infection. However, the role of these polymorphonuclear cells in mediating either the resistance or the pathogenesis of malaria is poorly understood. We report that circulating neutrophils from malaria patients are highly activated, as indicated by a strong type I interferon transcriptional signature, increased expression of surface activation markers, enhanced release of reactive oxygen species and myeloperoxidase, and a high frequency of low-density granulocytes. The activation of neutrophils was associated with increased levels of serum alanine and aspartate aminotransferases, indicating liver damage. In a rodent malaria model, we observed intense recruitment of neutrophils to liver sinusoids. Neutrophil migration and IL-1β and chemokine expression as well as liver damage were all dependent on type I interferon signaling. The data suggest that type I interferon signaling has a central role in neutrophil activation and malaria pathogenesis.