Dengue vascular leakage is augmented by mast cell degranulation mediated by immunoglobulin Fcγ receptors
Ayesa Syenina,
Cyril J Jagaraj,
Siti AB Aman,
Aishwarya Sridharan,
Ashley L St John
Affiliations
Ayesa Syenina
Program in Emerging Infectious Diseases, Duke-National University of Singapore, Singapore, Singapore
Cyril J Jagaraj
Program in Emerging Infectious Diseases, Duke-National University of Singapore, Singapore, Singapore
Siti AB Aman
Program in Emerging Infectious Diseases, Duke-National University of Singapore, Singapore, Singapore
Aishwarya Sridharan
Program in Emerging Infectious Diseases, Duke-National University of Singapore, Singapore, Singapore
Ashley L St John
Program in Emerging Infectious Diseases, Duke-National University of Singapore, Singapore, Singapore; Department of Pathology, Duke University Medical Center, Durham, United States
Dengue virus (DENV) is the most significant human arboviral pathogen and causes ∼400 million infections in humans each year. In previous work, we observed that mast cells (MC) mediate vascular leakage during DENV infection in mice and that levels of MC activation are correlated with disease severity in human DENV patients (St John et al., 2013b). A major risk factor for developing severe dengue is secondary infection with a heterologous serotype. The dominant theory explaining increased severity during secondary DENV infection is that cross-reactive but non-neutralizing antibodies promote uptake of virus and allow enhanced replication. Here, we define another mechanism, dependent on FcγR-mediated enhanced degranulation responses by MCs. Antibody-dependent mast cell activation constitutes a novel mechanism to explain enhanced vascular leakage during secondary DENV infection.
