Le virus d'Epstein-Barr ... infiltrant les thymomes MG : un spectateur innocent ou un médiateur de l'auto-immunité ?

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Le virus d'Epstein-Barr ... infiltrant les thymomes MG : un spectateur innocent ou un médiateur de l'auto-immunité ?

Message par Pboulanger » 11 déc. 2017 10:01

:hi:

:arrow: Lu sur :https://www.ncbi.nlm.nih.gov/pubmed/29221139

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Epstein-Barr virus in tumor-infiltrating B cells of myasthenia gravis thymoma: an innocent bystander or an autoimmunity mediator?
Cavalcante P1, Marcuzzo S1, Franzi S1, Galbardi B1, Maggi L1, Motta T2, Ghislandi R2, Buzzi A2, Spinelli L3, Novellino L3, Baggi F1, Antozzi C1, Conforti F4, De Pas TM4, Barberis M5, Bernasconi P1, Mantegazza R1.
Oncotarget. 2017 Sep 8;8(56):95432-95449. doi: 10.18632/oncotarget.20731. eCollection 2017 Nov 10.


Abstract


The thymus plays a key role in myasthenia gravis (MG), a B cell-mediated autoimmune disorder affecting neuromuscular junction.
Most MG patients have thymic abnormalities, including hyperplasia and thymoma, a neoplasm of thymic epithelial cells.
Epstein-Barr virus (EBV) is associated with autoimmune diseases and tumors.

Recently, we showed EBV persistence and reactivation in hyperplastic MG thymuses, suggesting that EBV might contribute to intra-thymic B cell dysregulation in MG patients.

Here, we investigated EBV involvement in thymoma-associated MG, by searching for EBV markers in MG (n=26) and non-MG (n=14) thymomas.

EBV DNA and EBV-encoded small nuclear RNA (EBER) 1 transcript were detected in 14/26 (53.8%) and 22/26 (84.6%) MG thymomas, and only in 3 of 14 (21.4%) non-MG thymomas.

Latent EBNA2 and late gp350/220 lytic transcripts were undetectable in all, but one, thymomas, and early lytic BZLF1 transcript was absent in all samples, suggesting that early infection events and EBV reactivation were very rare in thymomas.

EBER1 and 2-positive cells were detected in MG, but not in non-MG, thymomas, as well as cells expressing EBV latency proteins (EBNA1, LMP1, LMP2A), that were mainly of B cell phenotype, indicating EBV association with MG rather than with thymoma. Toll-like receptor (TLR) 3 transcriptional levels were higher in MG than non-MG thymomas and positively correlated with EBER1 levels, suggesting a role for EBERs in TLR3 activation.

Our findings show that EBV is commonly present in thymoma-infiltrating B cells of myasthenic patients, indicating a contribution of EBV to B cell-mediated autoreactivity in MG associated with thymic tumo

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