Phagocytosis Ros Production
Phagocytosis Ros Production - Related Videos
03:47
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In this video, we demonstrate an in vitro chemiluminescence assay to detect the generation of reactive oxygen species by neutrophils upon exposure to an opsonized bacterial biofilm.
07:17
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03:50
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This video describes the protocol for detecting total cellular reactive oxygen species (ROS) using 2',7'-dichlorodihydrofluorescein diacetate (DCFH-DA). This method helps visualize ROS localization in the adherent cells using a fluorescence microscope and further quantify ROS intensity with a fluorescence plate reader.
13:20
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07:33
Visualization of Vascular Ca2+ Signaling Triggered by Paracrine Derived ROS
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An efficient method to gain insights into visualizing the paracrine-derived ROS induction of endothelial Ca2+ signaling is described. This method takes advantage of measuring paracrine derived ROS triggered Ca2+ mobilization in vascular endothelial cells in a co-culture model.
FAQs
After engulfment, the NADPH oxidase becomes active at the phagosome and transfers electrons to oxygen. This reaction produces superoxide, which can generate hydrogen peroxide. In neutrophils, hydrogen peroxide also serves as a substrate for myeloperoxidase, leading to hypochlorous acid formation. These successive reactions create chemically distinct oxidants within the compartment containing the microbe.
Myeloperoxidase extends the oxidative pathway beyond superoxide and hydrogen peroxide. In neutrophils, it uses hydrogen peroxide to produce hypochlorous acid, adding another oxidant to the antimicrobial environment. This distinction is important when interpreting immune-cell responses because the oxidant profile depends not only on NADPH oxidase activation but also on the cellular machinery present.
ROS generated after uptake can support microbial destruction inside phagolysosomes and contribute to control of bacterial and fungal infections. The same chemistry can become harmful when oxidant production is excessive or poorly contained, allowing tissue injury and stronger inflammatory responses. Thus, the pathway has a dual role: antimicrobial defense on one side and potential inflammatory damage on the other.
A useful analysis follows the sequence from microbial engulfment to phagosome formation, NADPH oxidase activation, oxidant generation, and delivery into the phagolysosome. Examining these stages helps distinguish defective uptake from defective ROS production or impaired antimicrobial activity. It also connects the measured oxidative response with the cellular compartment where pathogen destruction is expected to occur.
This pathway can be used to investigate how innate immune cells control bacteria and fungi after uptake. Researchers can ask whether oxidant generation accompanies phagosome maturation and whether the resulting activity supports microbial killing. The approach also helps examine how altered ROS production may influence inflammatory responses during infection, linking cellular mechanisms with disease-relevant outcomes.
The pathway links a physical defense step, microbial engulfment, with chemical antimicrobial activity inside immune cells. Studying it clarifies how innate immunity handles internalized pathogens and why neutrophils can generate a broader oxidant response through myeloperoxidase. It also provides context for understanding inflammatory disease, where ROS that normally aid defense may contribute to host tissue injury.