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Updated: Aug 15, 2026
Bone Marrow-derived Macrophage Production
Published on: November 22, 2013
[Induction of Ca2+-dependent chemiluminescent response of peritoneal macrophages with bacterial lipopolysaccharides]
Abstract:
A lipopolysaccharide preparation obtained from Klebsiella pneumonia was shown to affect primarily the peritoneal macrophages after intraperitoneal administration. Transition of the macrophages to a new metabolic state in response to opsonized zymosan was responsible for a distinct increase in the rate of luminol-dependent chemoluminescence. At the same time, the macrophages produced chemiluminescence was only slightly increased in the presence of Ca2+ ionophore A23187. These dissimilar alterations observed suggest that the primary reaction of macrophages in response to the lipopolysaccharide occurred with the increase in content of intracellular free calcium. Administration of finoptin (calcium influx inhibitor) into suspension of macrophages caused a decrease in the rate of chemiluminescence response.
Insights
Lipopolysaccharide from Klebsiella pneumoniae activates peritoneal macrophages, increasing their chemiluminescence response. This suggests a primary role for increased intracellular calcium in the macrophage reaction to lipopolysaccharide.
Area of Science:
- Immunology
- Cell Biology
- Microbiology
Context:
- Lipopolysaccharide (LPS) from Klebsiella pneumoniae is a potent immune stimulant.
- Peritoneal macrophages are key immune cells involved in host defense.
- Chemiluminescence assays are used to measure cellular metabolic activity.
Purpose:
- To investigate the effect of Klebsiella pneumoniae lipopolysaccharide on peritoneal macrophages.
- To elucidate the role of intracellular calcium in macrophage activation by lipopolysaccharide.
- To assess the impact of calcium influx inhibition on macrophage chemiluminescence.
Summary:
- Intraperitoneal administration of Klebsiella pneumoniae lipopolysaccharide primarily affected peritoneal macrophages.
- Macrophage activation by opsonized zymosan led to increased luminol-dependent chemiluminescence, linked to intracellular calcium.
- Lipopolysaccharide-induced chemiluminescence was only slightly enhanced by Ca2+ ionophore A23187, suggesting calcium influx is critical.
- Inhibition of calcium influx with finoptin decreased the chemiluminescence response, confirming the role of calcium in LPS-mediated macrophage activation.
Impact:
- Provides insights into the early molecular events of macrophage activation by bacterial lipopolysaccharides.
- Highlights the crucial role of intracellular calcium dynamics in immune cell responses.
- Suggests potential therapeutic targets for modulating inflammatory responses mediated by macrophages.
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