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Isolation and Cultivation of Bacteria from Zebrafish Embryos to Assess Infection Load

作者：

简介：

Overview

This study investigates the infection of zebrafish embryos by Mycobacterium abscessus, a bacterium that affects the central nervous system. The methodology involves immobilizing the embryos, lysing them, and quantifying the bacterial load through colony-forming units.

Key Study Components

Area of Science

Microbiology
Neuroscience
Infectious Diseases

Background

Mycobacterium abscessus is known to form abscesses in the central nervous system.
Understanding bacterial load in infected embryos can provide insights into host-pathogen interactions.
Zebrafish embryos are a valuable model for studying infections due to their transparency and genetic tractability.
The study aims to develop a method for quantifying bacterial infections in this model organism.

Purpose of Study

To quantify the bacterial load of Mycobacterium abscessus in zebrafish embryos.
To establish a reliable method for studying bacterial infections in a live model.
To enhance understanding of the immune response to bacterial pathogens in the central nervous system.

Methods Used

Infection of zebrafish embryos with Mycobacterium abscessus.
Immobilization and euthanasia of embryos using anesthetics.
Lysis of embryos using detergent solutions and homogenization.
Quantification of bacterial load through serial dilution and plating on selective media.

Main Results

Successful establishment of a method to quantify bacterial load in zebrafish embryos.
Demonstration of the growth of Mycobacterium abscessus in the presence of antibiotics.
Identification of optimal conditions for colony formation on agar plates.
Quantification of colony-forming units at specified time points.

Conclusions

The developed method allows for effective quantification of bacterial infections in zebrafish embryos.
This approach can be utilized for further studies on host-pathogen interactions.
Insights gained may contribute to understanding immune responses in vertebrates.

Frequently Asked Questions

What is Mycobacterium abscessus?

Mycobacterium abscessus is a pathogenic bacterium that can cause infections in humans and is known to affect the central nervous system.

Why use zebrafish embryos for this study?

Zebrafish embryos are transparent and allow for easy observation of infections and immune responses, making them an ideal model organism.

How is the bacterial load quantified?

The bacterial load is quantified by serial dilution and plating on selective agar media, followed by counting colony-forming units.

What role do antibiotics play in the experiment?

Antibiotics are used to inhibit the growth of other microbes, allowing for the selective growth of Mycobacterium abscessus, which is engineered for antibiotic resistance.

What are the implications of this research?

This research provides insights into host-pathogen interactions and may inform future studies on bacterial infections and immune responses.

How does the method ensure accurate results?

The method includes multiple steps of washing, lysis, and careful plating to ensure that the quantification of bacteria is accurate and reproducible.

Take a zebrafish embryo infected with Mycobacterium abscessus, a pathogenic bacterium that targets the central nervous system and forms abscesses containing bacteria and host immune cells.

Incubate the embryo on ice to immobilize it, then expose it to an overdose of anesthetic to stop cardiac and neural activity, resulting in death.

Wash the embryo to remove residual anesthetic.

Add a detergent solution to disrupt cellular membranes and lyse the embryo.

Shear the lysate through a needle to homogenize the tissue and release the bacteria.

Centrifuge, discard the supernatant, and resuspend the pellet in a surfactant solution to prevent bacterial clumping.

Serially dilute the bacterial suspension and spread it onto agar plates.

The medium is supplemented with antibiotics to inhibit the growth of other microbes while the Mycobacterium cells engineered for antibiotic resistance proliferate.

Incubate to promote colony formation, enabling quantification of the embryo's bacterial load.

To enumerate colony-forming units or CFUs at the desired time point, collect five embryos per infection condition and transfer each embryo into a 1.5 milliliter microcentrifuge tube. Cryoanesthetize the embryos by incubation on ice for 10 minutes. After euthanizing the embryos with 300 to 500 milligrams per liter tricaine, use sterile water to wash the embryos twice in a new tube.

Next, after removing water at 2% Triton X-100 in 1 X PBS to each embryo, and use a 26-gauge needle to homogenize the tissue for complete lysis.

After centrifuging the suspension, use 1 X PBST to resuspend the pellet. Then, plate serial dilution of the homogenates on Middlebrook 7H10O^ADC supplemented with BBL MGIT PANTA.

Incubate the plates at 30 degrees Celsius for 4 days before counting the colonies.

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