Neutrophil Recognition
Neutrophil Recognition - Related Videos
03:06
An In Vitro Assay to Study the Interaction between Neutrophils and Biofilm
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2025
This video demonstrates an in vitro assay to study neutrophil-biofilm interaction. The pathogenic bacteria embedded in the biofilm and isolated neutrophils were tagged using fluorescent labels, and the immune response by the neutrophils and the evasion of the immune response by the bacteria were assessed using a fluorescence microscope.
04:32
Induction and Visualization of Neutrophil Extracellular Traps in Pre-Labeled Neutrophils
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2025
This video demonstrates the induction and visualization of neutrophil extracellular traps or NETs in pre-labeled neutrophils using patient serum containing anti-neutrophil cytoplasmic antibodies. Furthermore, using an impermeable DNA dye and fluorescence microscopy enables the visualization of NETs.
07:12
Neutrophil Isolation Protocol
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Cited by 173 •
2008
Neutrophils are among the first cells to arrive on the site of inflammatory immune response, and their functions and mechanisms have been studied extensively in vitro. We demonstrate a standard density gradient separation method to isolate human neutrophils from whole blood using commercially available separation media.
11:55
Physiological Correlates of Emotion Recognition
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2023
Source: Laboratories of Jonas T. Kaplan and Sarah I. Gimbel—University of Southern California The autonomic nervous system (ANS) controls the activity of the body's internal organs and regulates changes in their activity depending on the current environment. The vagus nerve, which innervates many of the internal organs, is an important part of the system. When our brain senses danger, vagal tone is inhibited, leading to a set of changes in the body designed to make us more prepared to fight or...
02:59
An In Vitro Assay for Measuring Neutrophil Serine Protease Activity Using a Fluorescent Reporter
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2025
This video demonstrates an in vitro assay to quantify neutrophil serine protease activity in sputum samples. The sample containing secreted protease is incubated with a fluorescent reporter bearing a recognition motif. Cleavage of the motif by the protease enables individual fluorescence emission by the donor and acceptor fluorophore of the reporter, indicating protease activity in the sample.
FAQs
Pattern-recognition receptors bind conserved molecules associated with invading microbes or signals released during tissue damage. This receptor engagement allows neutrophils to respond to infection and inflammation without requiring prior exposure to a specific pathogen. In immunology, these receptors provide an early detection system that links microbial or damage-associated signals to rapid innate immune activity.
Complement proteins and antibodies can opsonize microbial targets, meaning they coat those targets with molecules recognized by neutrophils. This coating strengthens receptor-mediated attachment between the neutrophil and the target. As a result, opsonization adds an antibody- and complement-supported layer to recognition, connecting innate cell activity with immune factors that can participate in adaptive responses.
The consequences depend on how neutrophil activation is regulated. Recognition supports protective responses that direct cells toward inflammatory signals and promote pathogen-eliminating activities. However, excessive activation can extend beyond the invading microbe or damaged area, contributing to tissue injury and inflammatory disease. This balance makes recognition important both for host defense and for understanding immunopathology.
Recognition initiates a coordinated sequence rather than a single cellular event. Chemotaxis helps direct neutrophils toward relevant sites, while phagocytosis permits uptake of targets. Degranulation releases stored antimicrobial contents, and reactive oxygen species provide additional pathogen-eliminating activity. Considering these responses together helps researchers evaluate how recognition is translated into functional defense against infection.
Studies of this process can clarify how innate and adaptive immunity coordinate during an immune response. They can also distinguish the contributions of pattern-recognition receptors, complement, and antibodies to target attachment and activation. These insights help explain how neutrophils respond rapidly to infection while interacting with broader immune mechanisms that shape inflammation and pathogen control.
Recognition is relevant because the same mechanisms that help neutrophils detect microbes and damage can also drive harmful inflammation when activation becomes excessive. Research therefore examines both protective pathogen elimination and the possibility of tissue injury. This dual perspective supports investigation of inflammatory disease as a problem of immune regulation, not simply failure to recognize infection.