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Neutrophil-Kupffer cell interaction: a critical component of host defenses to systemic bacterial infections
Stephen H Gregory1, Edward J Wing
1Department of Medicine, Rhode Island Hospital and Brown University School of Medicine, Providence 02903, USA. sgregory@lifespan.org
Abstract:
Most bacteria that enter the bloodstream are taken up and eliminated within the liver. The specific mechanisms that underlie the role of the liver in the resolution of systemic bacterial infections remain to be determined. The vast majority of studies undertaken to date have focused on the function of resident tissue macrophages (Kupffer cells) that line the liver sinusoids. Indeed, it is often reported that Kupffer cells ingest and kill the bulk of organisms taken up by the liver. Recent studies indicate, however, that phagocytosis by Kupffer cells is not the principal mechanism by which organisms are eliminated. Rather, elimination depends on the complex interaction of Kupffer cells and bactericidal neutrophils that immigrate rapidly to the liver in response to infection. We discuss the critical role of neutrophil-Kupffer cell interaction in innate host defenses and, conceivably, the development and expression of adaptive immunity in the liver.
Insights
The liver eliminates most bacteria from the bloodstream. This process relies on interactions between Kupffer cells and neutrophils, not just Kupffer cells alone, for effective bacterial clearance.
Area of Science:
- Immunology
- Hepatology
- Microbiology
Background:
- The liver is crucial for clearing bacteria from the bloodstream.
- Resident liver macrophages, Kupffer cells, were traditionally thought to be the primary mediators of bacterial elimination.
- Recent evidence suggests a more complex mechanism is involved.
Purpose of the Study:
- To investigate the mechanisms of bacterial clearance by the liver.
- To elucidate the roles of Kupffer cells and neutrophils in resolving systemic bacterial infections.
Main Methods:
- Review of recent studies on liver immune responses to bacteria.
- Analysis of the interaction between Kupffer cells and neutrophils in bacterial clearance.
Main Results:
- Kupffer cell phagocytosis alone is not the main mechanism for bacterial elimination.
- Bacterial clearance depends on the interaction between Kupffer cells and immigrating neutrophils.
- Neutrophils play a critical role in conjunction with Kupffer cells.
Conclusions:
- Neutrophil-Kupffer cell interaction is vital for innate immune defense against systemic bacterial infections.
- This interaction may also influence the development of adaptive immunity in the liver.