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Updated: Mar 23, 2026
Immunostimulatory Agent Evaluation: Lymphoid Tissue Extraction and Injection Route-Dependent Dendritic Cell Activation
Published on: September 16, 2018
PyMIF enhances the inflammatory response in a rodent model by stimulating CD11b(+) Ly6C(+) cells accumulation in
1Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China.
Abstract:
Macrophage migration inhibitory factor (PMIF) expressed by Plasmodium parasites has been proved to be similar to the mammalian MIF in both structure and biological activity and is a critical upstream regulator in antimalaria innate immunity. In this work, using a genetically modified (MIF-KO) strain of highly lethal rodent Plasmodium yoelii 17XL (Py17XL), we found that PyMIF could increase the secretion of pro-inflammatory factors by eliciting the CD11b(+) Ly6C(+) cells accumulated in the spleen of infected mouse. In addition, the chemotactic effect of PyMIF was demonstrated to associate with cell receptors CXCR2, CXCR4 and the cell surface markers ICAM-1, LFA-4.
Insights
Plasmodium macrophage migration inhibitory factor (PMIF) boosts pro-inflammatory responses in malaria by activating specific immune cells. This parasite factor interacts with key cell receptors, influencing innate immunity during infection.
Area of Science:
- Immunology
- Parasitology
- Molecular Biology
Background:
- Macrophage migration inhibitory factor (MIF) is crucial for innate immunity in mammals.
- Plasmodium parasite MIF (PyMIF) shares structural and functional similarities with mammalian MIF.
- PyMIF plays a significant role in regulating the host's immune response to malaria.
Purpose of the Study:
- To investigate the role of Plasmodium yoelii MIF (PyMIF) in modulating the host immune response during malaria.
- To identify the specific immune cells and molecular pathways affected by PyMIF.
- To understand the mechanism of PyMIF-induced immune cell recruitment and activation.
Main Methods:
- Utilized a genetically modified Plasmodium yoelii 17XL (Py17XL) MIF-knockout (MIF-KO) strain.
- Analyzed immune cell populations (CD11b(+) Ly6C(+)) in the spleen of infected mice.
- Investigated the expression of pro-inflammatory factors.
- Examined the association of PyMIF with cell surface receptors (CXCR2, CXCR4) and markers (ICAM-1, LFA-4).
Main Results:
- PyMIF significantly increases the secretion of pro-inflammatory factors.
- PyMIF elicits CD11b(+) Ly6C(+) cells accumulated in the spleen of infected mice.
- The chemotactic effect of PyMIF is mediated through CXCR2, CXCR4, ICAM-1, and LFA-4.
Conclusions:
- PyMIF is a critical regulator of innate immunity in Plasmodium infections.
- PyMIF promotes inflammation by activating specific immune cell subsets.
- Understanding PyMIF's interactions with host cell receptors provides insights into malaria pathogenesis and potential therapeutic targets.
