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Updated: Apr 26, 2026
Visualization of Macrophage Lytic Cell Death During Mycobacterial Infection in Zebrafish Embryos via Intravital Microscopy
Published on: January 9, 2019
Cellular visualization of macrophage pyroptosis and interleukin-1β release in a viral hemorrhagic infection in
Mónica Varela1, Alejandro Romero1, Sonia Dios1
1Marine Research Institute, CSIC, Vigo, Spain.
Abstract:
Hemorrhagic viral diseases are distributed worldwide with important pathogens, such as dengue virus or hantaviruses. The lack of adequate in vivo infection models has limited the research on viral pathogenesis and the current understanding of the underlying infection mechanisms. Although hemorrhages have been associated with the infection of endothelial cells, other cellular types could be the main targets for hemorrhagic viruses. Our objective was to take advantage of the use of zebrafish larvae in the study of viral hemorrhagic diseases, focusing on the interaction between viruses and host cells. Cellular processes, such as transendothelial migration of leukocytes, virus-induced pyroptosis of macrophages. and interleukin-1β (Il-1β) release, could be observed in individual cells, providing a deeper knowledge of the immune mechanisms implicated in the disease. Furthermore, the application of these techniques to other pathogens will improve the current knowledge of host-pathogen interactions and increase the potential for the discovery of new therapeutic targets. Importance: Pathogenic mechanisms of hemorrhagic viruses are diverse, and most of the research regarding interactions between viruses and host cells has been performed in cell lines that might not be major targets during natural infections. Thus, viral pathogenesis research has been limited because of the lack of adequate in vivo infection models. The understanding of the relative pathogenic roles of the viral agent and the host response to the infection is crucial. This will be facilitated by the establishment of in vivo infection models using organisms such as zebrafish, which allows the study of the diseases in the context of a complete individual. The use of this animal model with other pathogens could improve the current knowledge on host-pathogen interactions and increase the potential for the discovery of new therapeutic targets against diverse viral diseases.
Insights
Zebrafish larvae offer a novel in vivo model to study viral hemorrhagic diseases, revealing cellular interactions and immune responses. This research advances understanding of host-pathogen dynamics and potential therapeutic targets.
Area of Science:
- Virology
- Immunology
- Zebrafish research
Background:
- Viral hemorrhagic diseases pose global health challenges.
- Current research is limited by a lack of adequate in vivo models for studying viral pathogenesis and host-cell interactions.
- Understanding cellular targets beyond endothelial cells is crucial for comprehending disease mechanisms.
Purpose of the Study:
- To utilize zebrafish larvae as an in vivo model for investigating viral hemorrhagic diseases.
- To focus on the intricate interactions between viruses and host cells within a whole organism context.
- To gain deeper insights into immune mechanisms and cellular processes involved in viral hemorrhagic diseases.
Main Methods:
- Employing zebrafish larvae for in vivo infection studies.
- Observing cellular processes like leukocyte migration and macrophage pyroptosis at the single-cell level.
- Analyzing the release of key immune mediators such as interleukin-1β (IL-1β).
Main Results:
- Demonstrated the feasibility of observing cellular events in real-time within zebrafish larvae.
- Provided a detailed view of virus-host cell interactions, including immune responses.
- Highlighted the potential for studying specific cellular processes like transendothelial migration and pyroptosis.
Conclusions:
- Zebrafish larvae serve as a valuable in vivo model for studying viral hemorrhagic diseases and host-pathogen interactions.
- This model facilitates a deeper understanding of immune mechanisms and cellular pathogenesis.
- The approach holds promise for identifying new therapeutic targets for diverse viral infections.
