Host prion protein expression levels impact prion tropism for the spleen

Autoři: Vincent Béringue aff001;  Philippe Tixador aff001;  Olivier Andréoletti aff002;  Fabienne Reine aff001;  Johan Castille aff003;  Thanh-Lan Laï aff001;  Annick Le Dur aff001;  Aude Laisné aff001;  Laetitia Herzog aff001;  Bruno Passet aff003;  Human Rezaei aff001;  Jean-Luc Vilotte aff003;  Hubert Laude aff001
Působiště autorů: Université Paris-Saclay, INRAE, UVSQ, VIM Jouy-en-Josas, France aff001;  Ecole Nationale Vétérinaire Toulouse, INRAE, IHAP, Toulouse, France aff002;  Université Paris-Saclay, INRAE, AgroParisTech, GABI, Jouy-en-Josas, France aff003
Vyšlo v časopise: Host prion protein expression levels impact prion tropism for the spleen. PLoS Pathog 16(7): e1008283. doi:10.1371/journal.ppat.1008283
Kategorie: Research Article
doi: 10.1371/journal.ppat.1008283


Prions are pathogens formed from abnormal conformers (PrPSc) of the host-encoded cellular prion protein (PrPC). PrPSc conformation to disease phenotype relationships extensively vary among prion strains. In particular, prions exhibit a strain-dependent tropism for lymphoid tissues. Prions can be composed of several substrain components. There is evidence that these substrains can propagate in distinct tissues (e.g. brain and spleen) of a single individual, providing an experimental paradigm to study the cause of prion tissue selectivity. Previously, we showed that PrPC expression levels feature in prion substrain selection in the brain. Transmission of sheep scrapie isolates (termed LAN) to multiple lines of transgenic mice expressing varying levels of ovine PrPC in their brains resulted in the phenotypic expression of the dominant sheep substrain in mice expressing near physiological PrPC levels, whereas a minor substrain replicated preferentially on high expresser mice. Considering that PrPC expression levels are markedly decreased in the spleen compared to the brain, we interrogate whether spleen PrPC dosage could drive prion selectivity. The outcome of the transmission of a large cohort of LAN isolates in the spleen from high expresser mice correlated with the replication rate dependency on PrPC amount. There was a prominent spleen colonization by the substrain preferentially replicating on low expresser mice and a relative incapacity of the substrain with higher-PrPC level need to propagate in the spleen. Early colonization of the spleen after intraperitoneal inoculation allowed neuropathological expression of the lymphoid substrain. In addition, a pair of substrain variants resulting from the adaptation of human prions to ovine high expresser mice, and exhibiting differing brain versus spleen tropism, showed different tropism on transmission to low expresser mice, with the lymphoid substrain colonizing the brain. Overall, these data suggest that PrPC expression levels are instrumental in prion lymphotropism.

Klíčová slova:

Animal prion diseases – Cloning – Genetically modified animals – Immunoblotting – Mouse models – Scrapie – Sheep – Spleen


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