Antibodies to variable surface antigens induce antigenic variation in the intestinal parasite Giardia lamblia.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
03 05 2023
03 05 2023
Historique:
received:
11
04
2023
accepted:
25
04
2023
medline:
5
5
2023
pubmed:
4
5
2023
entrez:
3
5
2023
Statut:
epublish
Résumé
The genomes of most protozoa encode families of variant surface antigens. In some parasitic microorganisms, it has been demonstrated that mutually exclusive changes in the expression of these antigens allow parasites to evade the host's immune response. It is widely assumed that antigenic variation in protozoan parasites is accomplished by the spontaneous appearance within the population of cells expressing antigenic variants that escape antibody-mediated cytotoxicity. Here we show, both in vitro and in animal infections, that antibodies to Variant-specific Surface Proteins (VSPs) of the intestinal parasite Giardia lamblia are not cytotoxic, inducing instead VSP clustering into liquid-ordered phase membrane microdomains that trigger a massive release of microvesicles carrying the original VSP and switch in expression to different VSPs by a calcium-dependent mechanism. This novel mechanism of surface antigen clearance throughout its release into microvesicles coupled to the stochastic induction of new phenotypic variants not only changes current paradigms of antigenic switching but also provides a new framework for understanding the course of protozoan infections as a host/parasite adaptive process.
Identifiants
pubmed: 37137944
doi: 10.1038/s41467-023-38317-8
pii: 10.1038/s41467-023-38317-8
pmc: PMC10156722
doi:
Substances chimiques
Antigens, Surface
0
Antigens, Protozoan
0
Antibodies
0
Protozoan Proteins
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
2537Informations de copyright
© 2023. The Author(s).
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