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[Hepatic macrophages and virus]
1INSERM U74, Laboratoire de Virologie de la Faculté de Médicine, Strasbourg, France.
Abstract:
Kupffer cells are located at strategic positions in the liver sinusoids. They are involved in the clearance of about 90% of foreign particles namely viruses and play an important role in the pathogenesis since their interaction with viruses represents a major determinant of viremia. On the one hand, they may protect the host from the infection by taking up and degrading the viral particles as well as by presenting antigen to lymphocytes, on the other hand, they may enhance the infection by producing and disseminating viruses when they are permissive. When they are activated or when they produce interferon alpha, Kupffer cells exert an antiviral effect on adjacent cells. Moreover they participate to the inflammatory response by synthesizing numerous mediators. Their destruction as well as the alteration of their functional properties may have serious physiopathological consequences.
Insights
Kupffer cells, crucial liver immune cells, manage viral clearance and influence infection outcomes. Their function is vital for host defense and preventing severe liver disease.
Area of Science:
- Immunology
- Hepatology
- Virology
Context:
- Kupffer cells reside in liver sinusoids, strategically positioned for immune surveillance.
- They interact with approximately 90% of foreign particles, including viruses, impacting pathogenesis and viremia.
Purpose:
- To elucidate the dual role of Kupffer cells in viral infections: host protection versus viral dissemination.
- To understand Kupffer cell-mediated antiviral effects and inflammatory responses.
Summary:
- Kupffer cells can either eliminate viruses or, if permissive, contribute to viral spread.
- Activated Kupffer cells produce interferon-alpha, conferring antiviral protection to adjacent hepatocytes.
- These cells synthesize mediators involved in the inflammatory response.
Impact:
- Alterations in Kupffer cell function or integrity can lead to significant physiopathological consequences.
- Understanding Kupffer cell dynamics is critical for managing viral hepatitis and other liver diseases.