Lps Activation
Lps Activation - Related Videos
08:51
Intraductal Injection of LPS as a Mouse Model of Mastitis: Signaling Visualized via an NF-κB Reporter Transgenic
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Cited by 14 •
2012
Described here is a technique in which lipopolysaccharide is injected into the lactating mouse mammary gland via the nipple to simulate mastitis, a condition commonly caused by bacterial infection. Lipopolysaccharide injection results in increased nuclear factor kappa B (NF-κB) signaling, visualized through bioluminescent imaging of an NF-κB luciferase reporter mouse.
09:04
Detection of Neu1 Sialidase Activity in Regulating TOLL-like Receptor Activation
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Cited by 39 •
2010
The sialidase assay is a simple technical approach that will elucidate novel molecular mechanism(s) of TLR sensors of microbial infections and involvement in inflammatory diseases at the receptor level on the cell surface of live macrophages.
03:44
Detection of Inflammasome Activation via Fluorescence Microscopy
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2025
This video demonstrates a method to detect NLRP3 inflammasome activation in macrophages using fluorescent reporter probes. The cells are treated with potassium ionophores and glycine to induce inflammasome assembly and caspase-1 activation. Fluorescent reporter probes visualize activated caspase-1, and cells are stained with a fluorescent dye for nuclei visualization.
06:12
LPS and ATP-induced Death of PMA-differentiated THP-1 Macrophages and its Validation
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Cited by 1 •
2024
This protocol is based on LPS and ATP-induced death of PMA-differentiated THP-1 macrophages. We use flow cytometry to analyze Annexin V and 7-AAD double staining to detect cell death, using the whole cell and employing scanning electron microscopy to observe the cell membrane morphology.
06:51
Activation of Mouse Bone Marrow-Derived Macrophages in Response to Antibodies
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2025
In this video, we demonstrate the activation of bone marrow-derived macrophages in response to bacterial lipopolysaccharide and intravenous immunoglobulin.
FAQs
CD14 first recognizes LPS and transfers it to the TLR4–MD-2 receptor complex. This handoff enables the receptor components to dimerize, a structural change that initiates intracellular signaling. The sequence is important because it links detection of a bacterial membrane component to the regulated activation of inflammatory pathways, providing a defined entry point for studying receptor-level mechanisms.
Receptor dimerization activates NF-κB and mitogen-activated protein kinases, often abbreviated MAPKs. These signaling routes act downstream of the TLR4–MD-2 complex and drive production of inflammatory mediators such as cytokines and chemokines. Examining both pathways helps researchers distinguish broad inflammatory output from pathway-specific effects when evaluating how cells respond to LPS.
Cytokines and chemokines are important readouts because they can alter immune-cell behavior and reshape the tumor microenvironment. Their induction connects receptor signaling with broader immune–tumor interactions rather than limiting analysis to an intracellular event. Measuring these mediators can therefore help investigators assess how bacterial products may influence inflammatory conditions associated with cancer.
Researchers apply controlled LPS stimulation to create a defined inflammatory challenge and then examine the resulting signaling or mediator production. This approach can model inflammation, reveal responses downstream of the TLR4–MD-2 complex, and support evaluation of signaling inhibitors. Its value comes from connecting a controlled input with measurable changes in immune-related cellular behavior.
In cancer research, LPS activation provides a model for examining interactions between immune cells and tumors under inflammatory conditions. Studies can use it to explore how bacterial products affect the tumor microenvironment, influence immune-cell behavior, or alter tumor-associated processes. The resulting observations help frame inflammation as a potential factor in tumor progression and therapeutic responses.
Controlled stimulation can be incorporated into experiments that evaluate signaling inhibitors or assess inflammatory changes associated with treatment conditions. Investigators can compare cellular responses after LPS exposure and determine whether intervention changes downstream pathway activity or inflammatory mediator production. This design also helps examine whether bacterial-product-driven inflammation could influence responses to therapy in cancer-related models.