Tlr-4 Signaling
Tlr-4 Signaling - Related Videos
04:08
An Assay for TLR-Dependent NF-кB/AP-1 Transcription Factor Signaling in Macrophages
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2025
This video demonstrates an assay to examine the toll-like receptor(TLR)-dependent activity of the transcription factors nuclear factor-kappa-B (NF-κB) and activator protein-1 (AP-1) in macrophages. The TLRs trigger a pro-inflammatory signaling cascade upon recognizing damage-associated molecular patterns (DAMPs), activating NF-κB and AP-1. The engineered reporter macrophages produce secreted embryonic alkaline phosphatase (SEAP) enzyme upon NF-κB and AP-1 activation, which is detected via a...
03:53
An Assay to Screen Bioactive Nanoparticles for Toll-Like Receptor Signaling Inhibition
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2025
This video demonstrates a reporter cell-based assay for screening potential bioactive nanoparticles that inhibit Toll-like receptor (TLR) signaling. The assay involves introducing lipopolysaccharides (LPS) mixed with peptide-gold nanoparticle hybrids to reporter macrophages expressing the reporter proteins — secreted embryonic alkaline phosphatase (SEAP) and luciferase. The reduction of LPS-induced TLR signal mediated by the hybrids is determined by measuring the reporter signals.
07:33
Visualization of Vascular Ca2+ Signaling Triggered by Paracrine Derived ROS
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Cited by 10 •
2011
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.
09:51
Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
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Cited by 6 •
2017
Toll-like receptor (TLR) signaling plays an important role in the pathophysiology of many human inflammatory diseases, and regulating TLR responses by bioactive nanoparticles is anticipated to be beneficial in many inflammatory conditions. THP-1 cell-based reporter cells provide a versatile and robust screening platform for identifying novel inhibitors of TLR signaling.
07:58
Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood
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Cited by 12 •
2012
We describe use of ImageStream technology (www.amnis.com), which combines quantitative flow cytometry with simultaneous high-resolution digital imaging, to quantify cellular mechanisms of primary immune cells from well-defined patient cohorts. Our studies provide a blueprint for translational investigations to quantify lineage specific cellular responses in small samples from subject cohorts.
FAQs
CD14 and MD-2 help organize the LPS-sensing receptor complex before TLR4 signals. LPS binds this CD14-MD-2-TLR4 assembly, promoting TLR4 dimerization, an important activation step. This arrangement links recognition of a bacterial component to downstream intracellular signaling, rather than treating LPS detection and receptor activation as separate events.
The MyD88-dependent and TRIF-dependent branches provide distinct downstream routes from the activated receptor. Together, they connect TLR4 engagement to NF-kB activation, inflammatory cytokine production, and type I interferon induction. Considering both branches is important because focusing on only one would overlook part of the pathway's response profile and could give an incomplete view of innate immune activation.
TLR4 signaling must be interpreted in terms of both protective and harmful outcomes. Prompt activation supports rapid antimicrobial defense during infection or tissue injury, whereas excessive or prolonged activity can drive damaging inflammation. This distinction explains why the pathway is relevant not only to host protection, but also to sepsis, chronic inflammatory disease, and tissue damage.
NF-kB, inflammatory cytokines, and type I interferons represent different readouts of pathway activation. Their induction shows that TLR4 signaling is not limited to receptor engagement; it produces coordinated inflammatory and interferon-associated outputs. Examining this combination helps characterize how an innate response develops after LPS recognition and whether activation remains beneficial or becomes excessive.
Researchers can use TLR4 signaling as a framework for studying how organisms detect bacterial components and mount rapid innate responses. Relevant outcomes include receptor activation, NF-kB induction, inflammatory cytokine production, and type I interferon generation. Comparing these outputs can help characterize the balance between antimicrobial defense and inflammation in infection or tissue injury.
Within biology, the pathway provides a mechanistic link between host-pathogen interaction and inflammation. Bacterial LPS supplies the triggering signal, while TLR4-associated downstream routes shape the host response. Studying this link can clarify how innate immunity responds quickly to infection and why the same response, when poorly controlled, may contribute to tissue damage.
TLR4 is a potential immunomodulatory target because changing its signaling could alter both protective defense and harmful inflammation. A useful therapeutic rationale must therefore account for the pathway's dual effects: reducing excessive or prolonged activity may limit sepsis, chronic inflammatory disease, or tissue damage, but indiscriminate suppression could interfere with antimicrobial responses.