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The role of platelet-activating factor receptor (PAFR) in lung pathology during experimental malaria
Norinne Lacerda-Queiroz1, Milene Alvarenga Rachid, Mauro Martins Teixeira
1Laboratório de Imunofarmacologia/Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas da Universidade Federal de Minas Gerais, Minas Gerais, Brazil. norinneq@yahoo.com.br
Abstract:
Malaria-associated lung pathology has been a neglected area in the study of malaria complications. Platelet-activating factor (PAF) is an inflammatory mediator involved in lung inflammation. Using mice lacking the PAF receptor (PAFR(-/-)) we investigated the relevance of signaling through the PAFR for the lung inflammatory process triggered by Plasmodium berghei ANKA (PbA) strain infection. In PAFR(-/-) mice, pulmonary inflammation was markedly reduced as demonstrated by histology, production of certain pro-inflammatory mediators, accumulation of macrophage and CD8+ T cells in the lung parenchyma and the virtual absence of changes in vascular permeability. Therefore, PAFR activation is crucial in the pathogenesis of pulmonary damage associated with PbA infection in C57Bl/6 mice.
Insights
Platelet-activating factor receptor (PAFR) signaling is crucial for malaria-induced lung inflammation. Blocking PAFR significantly reduces pulmonary damage and inflammatory responses during Plasmodium berghei ANKA infection in mice.
Area of Science:
- Immunology
- Pathology
- Infectious Diseases
Background:
- Malaria complications, particularly lung pathology, are understudied.
- Platelet-activating factor (PAF) is implicated in inflammatory processes.
- The role of PAF signaling in malaria-induced lung inflammation requires investigation.
Purpose of the Study:
- To investigate the role of Platelet-activating factor receptor (PAFR) signaling in the pathogenesis of lung inflammation during Plasmodium berghei ANKA (PbA) infection.
- To determine if PAFR activation is essential for the development of pulmonary damage in a murine malaria model.
Main Methods:
- Utilized genetically modified mice lacking the PAF receptor (PAFR(-/-)).
- Infected C57Bl/6 mice with the Plasmodium berghei ANKA (PbA) strain.
- Assessed pulmonary inflammation through histology, mediator analysis, immune cell profiling, and vascular permeability measurements.
Main Results:
- PAFR(-/-) mice exhibited significantly reduced pulmonary inflammation compared to wild-type controls.
- Histological analysis showed diminished lung damage in PAFR(-/-) mice.
- Key pro-inflammatory mediators, macrophage and CD8+ T cell accumulation, and vascular permeability were markedly decreased in the absence of PAFR signaling.
Conclusions:
- PAFR activation plays a critical role in mediating lung inflammation and pathology during PbA infection.
- Targeting PAFR signaling represents a potential therapeutic strategy for managing severe malaria-induced lung complications.
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