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Updated: Mar 8, 2026
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Isolation And Dendritic Cell-Uptake of Small Extracellular Vesicles from Echinococcus granulosus
Published on: March 28, 2025
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Modification of host dendritic cells by microchimerism-derived extracellular vesicles generates split tolerance.
William Bracamonte-Baran1, Jonathan Florentin1,2, Ying Zhou1
1Division of Transplantation, Department of Surgery, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53792.
Summary
Maternal microchimerism can cause immune cells to acquire foreign antigens, leading to a unique "split tolerance" in offspring. This discovery reveals a new mechanism for immune regulation with broad implications.
Area of Science:
- Immunology
- Cell Biology
- Reproductive Biology
Background:
- Maternal microchimerism (MMc) is linked to transplant tolerance and reproductive success, but its mechanism remains unclear.
- MMc involves the transfer of cells between mother and offspring, potentially influencing immune responses.
Purpose of the Study:
- To investigate the mechanism by which maternal microchimerism influences offspring immune responses.
- To explore the role of dendritic cell (DC) antigen acquisition in MMc-mediated immune modulation.
Main Methods:
- Utilized a murine model to study MMc and its effects on host dendritic cells (DCs).
- Analyzed serum extracellular vesicles (EVs) for their role in membrane alloantigen acquisition (mAAQ).
- Assessed immune cell populations, antigen presentation, and T cell responses in mAAQ+ and non-mAAQ mice.
Main Results:
- MMc induced membrane alloantigen acquisition (mAAQ) in host DCs, a phenomenon transferable via serum EVs.
- mAAQ altered DC expression of PD-L1 and CD86, affecting allopeptide presentation.
- Mice with mAAQ exhibited "split tolerance," with proliferating T cells recognizing intact alloantigens but anergic T cells responding to allopeptide+self-MHC.
Conclusions:
- Extracellular vesicles link maternal microchimerism to split tolerance by facilitating DC alloantigen acquisition.
- This mechanism has significant implications for understanding transplant tolerance, tumor immunity, autoimmunity, and reproductive outcomes.
