Engulfment Reactions
Engulfment Reactions - Related Videos
07:38
An Engulfment Assay: A Protocol to Assess Interactions Between CNS Phagocytes and Neurons
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Cited by 111 •
2014
Microglia are the resident immune cells of the central nervous system (CNS) with a high capacity to phagocytose or engulf material in their extracellular environment. Here, a broadly applicable, reliable, and highly quantitative assay for visualizing and measuring microglia-mediated engulfment of synaptic components is described.
04:48
The Phagocytosis Assay: An Immunostaining Technique to Visualize Apoptotic Cell Engulfment in the Embryonic Cells of Drosophila melanogaster
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2025
This video demonstrates an immunostaining technique to visualize apoptotic cell engulfment in the homogenized embryonic cells of Drosophila melanogaster. This method provides insights into cellular physiology by determining the extent of apoptotic cell engulfment.
06:47
Experimental Analysis of Apoptotic Thymocyte Engulfment by Macrophages
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Cited by 9 •
2019
Here, we present a protocol to prepare apoptotic thymocytes and peritoneal macrophages and analyze the efficiency of efferocytosis and the specific inhibitor-mediated blocking of apoptotic thymocytes engulfment. This protocol has a broad application in cell-mediated clearance of other particles including artificial beads and bacteria.
07:41
Quantification of Microglial Engulfment of Synaptic Material Using Flow Cytometry
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Cited by 1 •
2024
Here we present two protocols to quantify microglial engulfment of vGLUT1-positive synapses and pHRodo Red-labeled crude synaptosomes using flow cytometry.
03:06
Reaction Mechanisms
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2020
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. For instance, the decomposition of ozone appears to follow a mechanism with two steps:
FAQs
Recognition is the initiating control point. Surface receptors bind molecular patterns or opsonins, which marks a target for uptake. That binding activates actin rearrangement, allowing the plasma membrane to extend around the material and close it into a phagosome. Thus, receptor-ligand interactions connect target identification with the physical machinery of internalization.
Phagosome-lysosome fusion creates an intracellular environment that can damage and break down engulfed material. The cargo encounters acidic conditions, hydrolytic enzymes, and antimicrobial molecules after the compartments merge. This step therefore determines whether internalization leads to effective destruction rather than simple sequestration, making it central to host defense against infectious material.
Failure can occur at different stages, including recognition of the target or intracellular killing after uptake. If receptors do not engage pathogens efficiently, internalization may be reduced. If processing inside the cell is impaired, engulfed microbes may not be exposed effectively to destructive conditions. Either defect can weaken microbial clearance and increase infection susceptibility.
These reactions provide a way to examine several linked outcomes: pathogen clearance, removal of dead cells, inflammation, and antigen processing. The relevant outcome depends on the engulfed material and how the cell processes it internally. Studying these responses helps connect cellular uptake with tissue defense, immune regulation, and maintenance of tissue homeostasis.
They show how immune cells identify infectious material, bring it inside the cell, and expose it to degradative and antimicrobial conditions. Comparing successful and unsuccessful responses can reveal whether a problem involves target recognition, membrane uptake, or intracellular destruction. This makes the process useful for interpreting differences in microbial clearance during infection research.
A useful analysis separates target recognition, internalization, intracellular processing, and the resulting biological effect. Receptor engagement indicates whether the material was identified, while phagosome-lysosome fusion indicates exposure to acidic, enzymatic, and antimicrobial conditions. Measuring the broader consequence, such as clearance, inflammation, or antigen processing, helps distinguish uptake defects from downstream functional problems.