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Assaying Blood Cell Populations of the Drosophila melanogaster Larva
Published on: November 11, 2015
Circulating blood cells function as a surveillance system for damaged tissue in Drosophila larvae
Daniel T Babcock1, Amanda R Brock, Greg S Fish
1Department of Biochemistry and Molecular Biology, University of Texas Graduate School of Biomedical Sciences, University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA.
Summary
Insect immune cells (hemocytes) rapidly circulate to monitor tissues. Upon injury, circulating hemocytes are captured by wounds, becoming active and later rejoining circulation, revealing a shared inflammatory mechanism with vertebrates.
Area of Science:
- Insect immunology
- Comparative physiology
- Developmental biology
Background:
- Insects possess an open circulatory system where hemolymph bathes organs.
- Hemolymph contains immune cells (hemocytes) crucial for inflammation.
- Understanding hemocyte dynamics in response to injury is vital.
Purpose of the Study:
- To investigate the circulatory dynamics of Drosophila larval hemocytes.
- To understand hemocyte response to tissue injury using live imaging.
- To compare insect hemocyte recruitment with vertebrate inflammatory responses.
Main Methods:
- Utilized live imaging of transgenic Drosophila larvae.
- Employed fluorescently labeled hemocytes to track their movement.
- Observed hemocyte behavior under normal conditions and after epidermal wounding.
Main Results:
- Under normal conditions, circulating hemocytes are motile, while tissue-bound hemocytes are sessile.
- Following wounding, circulating hemocytes are rapidly recruited to the injury site via adhesive capture.
- Recruited hemocytes exhibit phagocytic activity and are released by healing epidermis.
Conclusions:
- Circulating hemocytes act as a surveillance system for tissue damage in insects.
- Adhesive capture is a conserved mechanism for inflammatory cell recruitment in insects and vertebrates.
- This study highlights shared principles in immune responses despite divergent circulatory system architectures.
