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Mannan-binding lectin modulates the response to HSV-2 infection
M Gadjeva1, S R Paludan, S Thiel
1Department of Medical Microbiology and Immunology, University of Aarhus, Aarhus, Denmark. mg@immunology.au.dk
Clinical and Experimental Immunology
|October 23, 2004
Summary
Mannan-binding lectin (MBL) deficiency impairs the immune system's ability to clear herpes simplex virus-2 (HSV-2), leading to increased susceptibility and liver dysfunction. Restoring MBL levels improved viral clearance, highlighting MBL's crucial role in antiviral defense.
Area of Science:
- Immunology
- Virology
- Molecular Biology
Background:
- Viruses like herpes simplex virus-2 (HSV-2) employ strategies to evade immune detection.
- Mannan-binding lectin (MBL), an initiator of the complement system, recognizes certain viruses, including HSV-2.
- Understanding MBL's role in viral infections is crucial for developing effective therapeutic strategies.
Purpose of the Study:
- To investigate the impact of MBL deficiency on HSV-2 infection using a mouse model.
- To determine if MBL influences viral clearance and liver function during HSV-2 infection.
- To assess the correlation between MBL levels and HSV-2 susceptibility in human patients.
Main Methods:
- Infection of MBL-A and MBL-C double knock-out (DKO) mice with HSV-2 via intraperitoneal route.
- Measurement of viral burden in various organs (liver, spleen, brain) and assessment of liver function markers (alanine-amino transferase).
- Reconstitution of DKO mice with recombinant human MBL and analysis of MBL levels in serum samples from asymptomatic and symptomatic human HSV-2 patients.
Main Results:
- DKO mice exhibited less efficient HSV-2 clearance from the liver compared to wild-type mice, correlating with compromised liver function.
- No significant differences in viral burden were observed in the spleen or brain of DKO mice.
- Recombinant MBL administration significantly reduced viral titers in the liver of infected mice.
- A higher frequency of MBL deficiency was observed in symptomatic HSV-2 patients compared to asymptomatic individuals.
Conclusions:
- MBL plays a significant role in modulating the host response to HSV-2 by enhancing viral neutralization, particularly in preserving liver homeostasis.
- MBL deficiency is associated with increased susceptibility to HSV-2 infection and impaired viral clearance.
- These findings suggest that MBL-mediated complement activation is important for controlling HSV-2 infection and may influence disease progression in humans.