Bacterial Lps
Bacterial Lps - 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.
04:12
An In Vitro Technique to Study Antimicrobial Treatments on Bacterial Aggregates
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2025
This video demonstrates an in vitro technique to study the impact of antimicrobial treatment on Pseudomonas aeruginosa (Pa) aggregates. Fluorescently-labeled Pa cells are grown as aggregates, mimicking the growth pattern during infection. Upon challenging the aggregates with a sublethal concentration of the antibiotic colistin, the real-time assessment of the bacteria-antibiotic interaction is performed via fluorescence microscopy.
02:34
Intraperitoneal Injection of Bacterial Lipopolysaccharide in Mice to Study Systemic Immune Responses
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2026
Source: Radulovic, K., et al. Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach. J. Vis. Exp. (2018)This video demonstrates a step-by-step procedure for injecting lipopolysaccharide (LPS) into mice intraperitoneally to induce systemic inflammation.
05:21
Bacterial Transformation - Student Protocol
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2019
Bacterial Transformation ExpandIMPORTANT: In addition to wearing the appropriate personal protective equipment, be sure to take care to keep your face away from suspension cultures, and to avoid inhaling reagents. Do not touch your face while performing the experiment. Always wash your hands before and after every experiment. When you are ready to safely begin, check to make sure you have a tube or tubes of competent E. coli cells in your ice bucket. Then, transfer 50 µL from one of these tubes...
03:57
Bacterial Infection Quantitation Assay: A Method to Quantify Intraocular Bacterial Load in Mouse Model of Bacterial Endophthalmitis
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2025
This video describes the technique of quantifying bacterial infection from eye homogenates obtained from a murine model of bacterial endophthalmitis caused by Bacillus cereus. This technique helps study the host immune response and its dependency on the host and ocular bacterial gene expression in murine models.
FAQs
These regions give investigators separate structural and functional features to examine. Lipid A provides the membrane anchor and is the component linked in the overview to Toll-like receptor 4 activation. The core oligosaccharide and O-antigen are therefore considered alongside lipid A when relating LPS architecture to membrane organization, host interaction, and endotoxin activity.
Recognition of lipid A by Toll-like receptor 4 connects a bacterial membrane component to host innate immunity. This signaling can trigger inflammation, so the same molecular feature that contributes to endotoxin activity also becomes a focus for understanding immune regulation during infection. Studying that connection helps explain how Gram-negative bacteria influence host responses.
Beyond its signaling effects, LPS contributes to membrane stability and bacterial survival. This dual role matters because the bacterial membrane can affect persistence while the molecule simultaneously shapes host responses. Biology studies therefore examine LPS as both a structural feature of Gram-negative bacteria and a contributor to disease-associated endotoxin activity.
An investigation can separate structural questions from signaling questions. Structural analysis considers lipid A, the core oligosaccharide, and the O-antigen in relation to membrane organization. Signaling analysis focuses on lipid A and Toll-like receptor 4, then connects receptor activation with inflammation and innate immune responses. Together, these perspectives link molecular features with biological outcomes.
Researchers study Bacterial LPS to clarify how Gram-negative organisms interact with host organisms and contribute to pathogenesis. The same work can illuminate immune regulation by tracing how LPS-associated signaling relates to inflammation and innate responses. These findings provide biological context for evaluating bacterial survival, infection processes, and host-microbe interactions.
Findings from LPS research can support several practical goals in biology. They may inform antimicrobial development through improved understanding of bacterial membrane and survival-related properties, guide vaccine design through clearer knowledge of host interaction, and assist diagnosis of Gram-negative bacterial diseases. The work also connects molecular structure with infection-associated immune responses.