Virulence Factor Secretion
Virulence Factor Secretion - Related Videos
11:33
Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking
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Cited by 2 •
2013
This article illustrates the use of pulse-chase radio labeling in combination with site-specific photocrosslinking to monitor interactions between a protein of interest and other factors in E. coli. Unlike traditional chemical cross-linking methods, this approach generates high resolution “snapshots” of an ordered assembly pathway in a living cell.
08:51
Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling
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Cited by 11 •
2015
The method described here is used to induce the apoptotic signaling cascade at defined steps in order to dissect the activity of an anti-apoptotic bacterial effector protein. This method can also be used for inducible expression of pro-apoptotic or toxic proteins, or for dissecting interference with other signaling pathways.
11:32
Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
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Cited by 18 •
2014
Streptococcus pneumoniae is the leading pathogen causing severe community-acquired pneumonia and responsible for over 2 million deaths worldwide. The impact of bacterial factors implicated in fitness or virulence can be monitored in real-time in an acute mouse pneumonia or bacteremia model using bioluminescent bacteria.
09:03
Monitoring Functionality and Morphology of Vasculature Recruited by Factors Secreted by Fast-growing Tumor-generating Cells
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Cited by 7 •
2014
We describe a matrigel plug assay to illustrate angiogenic potential of a pool of factors secreted by cancer cells using two complementary imaging modalities, ultrasound and endomicroscopy. The matrigel, an extracellular matrix (ECM)-mimic gel, is utilized to introduce the host (mouse) with angiogenic factors secreted to the conditioned media...
04:46
Assessment of Leishmania Virulence within Cultured Macrophages
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2025
This video investigates Leishmania's virulence by treating macrophages with metacyclic promastigotes, resulting in the formation of intracellular amastigotes. The confirmation of Leishmania's virulence is achieved through nucleic acid fluorescent dye staining. This insight can contribute to the development of new therapies for leishmaniasis.
FAQs
Bacterial secretion systems function as specialized nanomachines that move proteins, toxins, enzymes, and other effectors across the cell envelope or directly into host cells. Their route determines where a molecule becomes active, allowing pathogens to influence host signaling, cytoskeletal organization, or barrier function. This provides a mechanistic link between export and infection-related effects.
Environmental cues such as host contact or nutrient availability can regulate secretion systems. This control helps pathogens coordinate export with conditions encountered during infection rather than releasing virulence-associated molecules indiscriminately. Because the systems respond to changing surroundings, secretion can be linked to the stage or location of host interaction, making regulation important for colonization, immune evasion, and tissue damage.
The destination of a secreted factor shapes its immediate role. Export across the bacterial cell envelope makes molecules available beyond the microorganism, whereas direct delivery into host cells places effectors inside the cells they alter. This distinction helps explain how related secretion systems can produce different outcomes, from external effects to targeted changes in host signaling or structure.
Once delivered, effectors can alter signaling pathways, cytoskeletal organization, or barrier function in host cells. These changes can modify how cells communicate, organize their internal framework, or preserve protective barriers. Examining which cellular processes are affected connects a secretion event to recognizable consequences for pathogen-host interactions and helps identify molecular points where infection may be interrupted.
Studying virulence factor secretion reveals how pathogens interact with hosts at molecular and cellular levels. Researchers can use secretion behavior to connect exported proteins, toxins, enzymes, or other effectors with colonization, immune evasion, or tissue damage. This information clarifies pathogen-host mechanisms and can guide investigation of intervention points.
Anti-virulence strategies are relevant when the goal is to disarm a pathogen rather than necessarily kill it. Targeting secretion could interfere with delivery of molecules that support colonization, immune evasion, or tissue damage. This approach follows from treating secretion as a contributor to disease mechanisms and a potential antimicrobial therapy target.
The study of secretion can support more than mechanistic research. Findings may guide vaccine development, diagnostic development, and antimicrobial strategies by identifying secretion-related features associated with pathogenic activity. Such work connects molecular export systems to practical tools for detecting pathogens, preventing infection, or reducing harmful host effects.