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Requirement of MIP-1 alpha for an inflammatory response to viral infection
D N Cook1, M A Beck, T M Coffman
1Department of Pathology, University of North Carolina, Chapel Hill 27599-7525, USA.
Abstract:
Macrophage inflammatory protein-1 alpha (MIP-1 alpha) is a chemokine that has pro-inflammatory and stem cell inhibitory activities in vitro. Its biologic role in vivo was examined in mice in which the gene encoding MIP-1 alpha had been disrupted. Homozygous MIP-1 alpha mutant (-/-) mice were resistant to Coxsackievirus-induced myocarditis seen in infected wild-type (+/+) mice. Influenza virus-infected -/- mice had reduced pneumonitis and delayed clearance of the virus compared with infected +/+ mice. The -/- mice had no overt hematopoietic abnormalities. These results demonstrate that MIP-1 alpha is an important mediator of virus-induced inflammation in vivo.
Insights
Macrophage inflammatory protein-1 alpha (MIP-1 alpha) mediates virus-induced inflammation. Mice lacking MIP-1 alpha showed resistance to viral myocarditis and reduced lung inflammation, demonstrating its crucial role in vivo.
Area of Science:
- Immunology
- Virology
- Molecular Biology
Background:
- Macrophage inflammatory protein-1 alpha (MIP-1 alpha) is a chemokine with known pro-inflammatory and stem cell inhibitory functions in vitro.
- The in vivo biological role of MIP-1 alpha in the context of viral infections remained largely uncharacterized.
Purpose of the Study:
- To investigate the in vivo role of MIP-1 alpha in viral-induced inflammation.
- To determine the effects of MIP-1 alpha gene disruption on the course of viral infections in mice.
Main Methods:
- Generation and analysis of MIP-1 alpha knockout (MIP-1 alpha -/-) mice.
- Infection of wild-type (+/+) and MIP-1 alpha -/- mice with Coxsackievirus and Influenza virus.
- Assessment of myocarditis, pneumonitis, viral clearance, and hematopoietic parameters.
Main Results:
- MIP-1 alpha -/- mice were resistant to Coxsackievirus-induced myocarditis compared to wild-type mice.
- Influenza virus-infected MIP-1 alpha -/- mice exhibited reduced pneumonitis and delayed viral clearance.
- No overt hematopoietic abnormalities were observed in the MIP-1 alpha -/- mice.
Conclusions:
- MIP-1 alpha is a significant mediator of virus-induced inflammation in vivo.
- Targeting MIP-1 alpha may offer therapeutic potential for viral inflammatory diseases.