Visual Detection of Malaria Parasite-Parasitized Erythroblasts in Peripheral Blood via Immunization-Based Model
Kumpei Ito1, Yuki S Tateishi1, Takashi Imai1,2,3,4,5
1Department of Parasitology, National Institute of Infectious Diseases (NIID), Japan Institute for Health Security (JIHS), Tokyo 162-0052, Japan.
Vaccines
|September 27, 2025
Summary
Parasitized erythroblasts (pEBs) are malaria hosts, but rare in blood. A new method boosts pEB numbers in mice, enabling study of their role in malaria and host protection.
Area of Science:
- Malariology
- Hematology
- Immunology
Background:
- Erythroblasts are identified as host cells for malarial parasites.
- The low abundance of parasitized erythroblasts (pEBs) in peripheral blood limits in vivo studies.
Purpose of the Study:
- To develop a model for visualizing and studying pEBs in vivo.
- To investigate the biological significance of pEBs in malaria.
Main Methods:
- Established a murine model by immunizing mice with live Plasmodium yoelii 17XNL.
- Challenged immunized mice with P. berghei ANKA to increase circulating pEBs.
- Visualized pEBs in peripheral blood using Giemsa-stained smears.
Main Results:
- Immunized mice showed protection against cerebral malaria and increased survival.
- pEBs, including enucleating forms, were detected in the circulation of protected mice.
- All blood-stage malaria parasite forms were found within pEBs.
Conclusions:
- The developed model allows for in vivo and ex vivo analysis of pEB biology.
- This approach bypasses the need for bone marrow or spleen isolation, reducing technical and ethical challenges.
