Bacterial Delivery
Bacterial Delivery - Related Videos
02:22
Performing Intratracheal Bacterial Delivery in a Mouse Model
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2025
Source: Venuprasad, K., et al. Intra-tracheal Administration of Haemophilus influenzae in Mouse Models to Study Airway Inflammation. J. Vis. Exp. (2016)This video demonstrates the intratracheal delivery of a lung-pathogenic bacterial inoculum into an anesthetized mouse to model lower respiratory tract infection.
07:56
Bacterial Delivery of RNAi Effectors: Transkingdom RNAi
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Cited by 18 •
2010
For development of RNA interference (RNAi)-based therapies, a novel strategy was developed, transkingdom RNAi (tkRNAi). This technology uses non-pathogenic bacteria to produce and deliver therapeutic short hairpin RNA (shRNA) into target cells. Here, tkRNAi was successfully applied for reversal of classical ABCB1-mediated multidrug resistance (MDR) of cancer cells.
02:20
Monitoring Bacterial Infection and Effector Protein Delivery in Plant Cells
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2025
Source: Lee, H. et. al., Split Green Fluorescent Protein System to Visualize Effectors Delivered from Bacteria During Infection. J. Vis. Exp. (2018)This video demonstrates a method for monitoring bacterial infection and effector protein delivery in plant cells using split superfolder green fluorescent protein (sfGFP) complementation combined with confocal microscopy. The approach enables precise visualization of effector translocation into the host cell cytosol.
04:55
Electroporation-Based Delivery of Fluorescent Biomolecules into Bacterial Cells
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2025
Source: Aigrain, L., et al. Internalization and Observation of Fluorescent Biomolecules in Living Microorganisms via Electroporation. J. Vis. Exp. (2015)The video demonstrates the delivery of fluorescent biomolecules into electrocompetent microbial cells using electroporation. The process begins with the introduction of fluorophore-tagged DNA or proteins into a chilled cell suspension. A high-voltage pulse is then applied to create temporary membrane pores, enabling biomolecule entry into the...
00:13
A Precise Pathogen Delivery and Recovery System for Murine Models of Secondary Bacterial Pneumonia
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Cited by 2 •
2019
Here, we present methods to improve secondary bacterial pneumonia studies by providing a non-invasive route of instillation into the lower respiratory tract followed by pathogen recovery and transcript analysis. These procedures are reproducible and can be performed without specialized equipment such as cannulas, guide wires, or fiber optic cables.
FAQs
Specificity comes from matching bacterial behavior to features of the target biological environment. A delivery system can be designed so bacterial cells respond to local conditions, concentrating payload release near selected cells or tissues rather than distributing it uniformly. This targeting principle makes delivery specificity a central measure of effectiveness, alongside bacterial safety and control of the host immune response.
The release route determines how a payload becomes available to the target. Secretion exports the therapeutic material from bacterial cells, whereas lysis releases the payload when the cells break down. Stimulus-responsive gene expression links payload production or release-related activity to features of the biological environment. Selecting among these mechanisms helps align delivery behavior with the intended target.
A payload must remain stable long enough to reach its intended destination and retain its useful activity. At the same time, the host immune response must be controlled so it does not undermine delivery or create an unsuitable biological environment. These requirements explain why effectiveness depends on more than carrying capacity: stability, safety, specificity, and immune compatibility must work together.
Naturally occurring bacteria provide biological delivery capabilities already present in the selected organism, whereas genetically engineered bacteria can be programmed to carry a chosen payload or respond to a selected stimulus. This distinction gives engineered systems greater control over payload handling or release, while both approaches require attention to delivery specificity, bacterial safety, and the host immune response.
A basic Bacterial Delivery design process starts by identifying the target cells or tissue, selecting a bacterial carrier, and assigning a therapeutic molecule, protein, or genetic material as the payload. Researchers then choose a release approach, such as secretion, lysis, or stimulus-responsive expression, and assess specificity, payload stability, bacterial safety, and host immune response.
Biomedical researchers apply bacterial delivery to develop living therapeutics, vaccines, and targeted treatments. The same approach can transport therapeutic molecules, proteins, or genetic material toward specific cells or tissues, making it relevant when localization and controlled release are important. Its practical value depends on whether the bacterial system can maintain payload stability while meeting safety and immune-response requirements.
Researchers can evaluate a system by examining whether the payload reaches the intended cells or tissues, remains stable, and is released through the selected mechanism. They also need to consider bacterial safety and how effectively the host immune response is controlled. Together, these factors indicate whether the delivery design functions as intended and whether it is suitable for biological or biomedical research.