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Macrophage sensitivity to endotoxin: genetic control by a single codominant gene
Journal of Immunology (Baltimore, Md. : 1950)
|November 1, 1978
Summary
Lipopolysaccharide (LPS) directly affects macrophages, impacting their LAF production, PGE2 release, and phagocytic ability. A single autosomal gene controls these macrophage and B lymphocyte responses to LPS.
Area of Science:
- Immunology
- Genetics
- Cell Biology
Background:
- Lipopolysaccharide (LPS) is a key component of Gram-negative bacteria that interacts with macrophages.
- Macrophages play a crucial role in innate immunity and are activated by LPS.
- Previous studies indicated variations in macrophage responses to LPS in different mouse strains.
Purpose of the Study:
- To investigate the direct effects of LPS on macrophage functions in vitro.
- To identify the genetic basis underlying macrophage sensitivity to LPS.
- To determine if the same gene controls both macrophage and B lymphocyte responses to LPS.
Main Methods:
- In vitro culture of macrophages exposed to LPS.
- Assessment of LAF production, PGE2 release, cytotoxicity, and phagocytic ability.
- Genetic analysis including F1 crosses and backcross linkage analysis in mice.
Main Results:
- LPS directly induces LAF and PGE2 production in macrophages.
- LPS exhibits cytotoxicity and inhibits phagocytosis in macrophages from LPS-sensitive mice.
- Macrophage responses in (C3H/HeJ X C3H/HeN)F1 hybrids were intermediate, suggesting codominance.
- No sex linkage was observed for LPS sensitivity.
Conclusions:
- A single autosomal codominant gene controls macrophage sensitivity to LPS.
- This gene also regulates B lymphocyte sensitivity to LPS.
- These findings elucidate the genetic control of innate immune responses to bacterial components.