Microgavage of zebrafish larvae

Area of Science:

• * Zebrafish model organism research
• * Intestinal biology and physiology
• * Host-microbe interactions

Background:

• * Zebrafish are a key model for studying intestinal development, physiology, disease, and host-microbe interactions.
• * Current methods for delivering substances into the larval zebrafish intestine (immersion or injection) have limitations in control, accuracy, and potential for toxicity.
• * Accurate and controlled delivery of materials is crucial for advancing research in these areas.

Purpose of the Study:

• * To introduce and validate a novel microgavage technique for precise delivery of materials into the larval zebrafish intestine.
• * To establish a safe, effective, and consistent method for in vivo intestinal research in zebrafish.
• * To develop new assays for assessing intestinal barrier integrity and motility using microgavage.

Main Methods:

• * Developed a microgavage technique using standard embryo microinjection and stereomicroscopy equipment.
• * Optimized the procedure for rapid gavage (7-10 fish/min) with high post-gavage survival rates.
• * Established fluorescent dextran and microsphere assays to quantify intestinal transit and motility.

Main Results:

• * Microgavage allows for controlled, direct delivery of materials to the anterior intestine lumen.
• * Achieved high survival rates (approaching 100%) and enabled delivery of higher material concentrations compared to immersion methods.
• * Demonstrated utility in quantifying intestinal barrier integrity and evaluating intestinal motility.

Conclusions:

• * Microgavage provides a significant advancement for in vivo intestinal research in larval zebrafish.
• * This method enhances the ability to study intestinal physiology, disease, and host-microbe interactions with greater precision.
• * The developed assays offer novel tools for assessing intestinal barrier function and motility in zebrafish.