Related Experiment Video
Updated: Jun 7, 2025
Long-term In Vivo Tracking of Inflammatory Cell Dynamics Within Drosophila Pupae
Published on: June 14, 2018
Discovering mechanisms of macrophage tissue infiltration with Drosophila
Daria E Siekhaus1, Jasmine A Stanley-Ahmed2
1Department of Molecular, Cellular and Developmental Biology, University of California Los Angeles, Los Angeles, CA 90095 USA.
Abstract:
Much is known about the importance of macrophages for regulating diverse aspects of organismal physiology, alongside their essential roles in inflammation. Relatively unexplored are the processes influencing macrophages' and monocytes' ability to invade into the tissues where they carry out these functions. Drosophila plasmatocytes, also called hemocytes, show similarities to vertebrate macrophages in their function and their molecular specification; they have recently been shown to also infiltrate into tissues during development and inflammation. Extravasation across vasculature, into tumors, the brain, and adipose tissue have all been observed. We discuss the striking parallels in some of these systems to vertebrate immune responses, including a requirement for tumor necrosis factor. Finally, we highlight the new pathways regulating infiltration found in the fly that remain as yet unexamined in a vertebrate context.
Insights
Investigating immune cell infiltration in fruit flies reveals conserved mechanisms with vertebrates. Understanding how these cells, called plasmatocytes, enter tissues can inform studies on inflammation and disease.
Area of Science:
- Immunology
- Developmental Biology
- Cell Biology
Background:
- Macrophages regulate physiology and inflammation, but their tissue invasion mechanisms are poorly understood.
- Drosophila plasmatocytes (hemocytes) share functional and molecular similarities with vertebrate macrophages.
- Plasmatocyte infiltration into various tissues during development and inflammation has been recently observed.
Purpose of the Study:
- To explore the processes influencing immune cell invasion into tissues.
- To investigate the parallels between Drosophila plasmatocyte infiltration and vertebrate immune responses.
- To identify novel pathways regulating immune cell infiltration in Drosophila.
Main Methods:
- Comparative analysis of immune cell infiltration mechanisms.
- Utilizing Drosophila melanogaster as a model organism.
- Review of existing literature on macrophage and plasmatocyte biology.
Main Results:
- Drosophila plasmatocytes exhibit extravasation into diverse tissues, mirroring vertebrate immune cell behavior.
- Tumor necrosis factor (TNF) signaling is crucial for some aspects of fly immune cell infiltration, similar to vertebrates.
- Novel pathways regulating fly plasmatocyte infiltration have been identified.
Conclusions:
- Drosophila serves as a valuable model for studying conserved mechanisms of immune cell tissue invasion.
- Further research into fly-specific infiltration pathways may uncover new therapeutic targets for vertebrate inflammatory diseases.
- Understanding immune cell extravasation is critical for addressing inflammatory conditions and cancer progression.
