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<dc:title xml:lang="fr">Evaluation et développement de marqueurs de la réplication du BK virus en transplantation rénale</dc:title>
<dcterms:alternative xml:lang="en">Evaluation and development of markers of BK virus replication in kidney transplantation</dcterms:alternative>
<dc:subject xml:lang="fr">BK virus</dc:subject>
<dc:subject xml:lang="fr">Néphropathie</dc:subject>
<dc:subject xml:lang="fr">PCR quantitative en temps réel</dc:subject>
<dc:subject xml:lang="fr">Marqueur prédictif</dc:subject>
<dc:subject xml:lang="fr">Anticorps neutralisants</dc:subject>
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<dc:subject xml:lang="en">Nephropathy</dc:subject>
<dc:subject xml:lang="en">Quantitative real-time PCR</dc:subject>
<dc:subject xml:lang="en">Predictive marker</dc:subject>
<dc:subject xml:lang="en">Neutralizing antibodies</dc:subject>
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<tef:elementdEntree autoriteExterne="029753147" autoriteSource="Sudoc">Immunosuppression d'origine virale</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La néphropathie à BK virus (BKV) est l'une des complications les plus fréquentes de la transplantation rénale. La prise en charge consiste en la réduction préemptive de l'immunosuppression basée sur le suivi de la charge virale, mais cette stratégie n’est pas complètement efficace et augmente le risque de rejet. Dans un premier volet, nous avons évalué la mesure de la charge virale par PCR quantitative en temps réel, permettant de mettre en évidence des facteurs de variabilité comme le polymorphisme du BKV et de valider la technique utilisée pour le suivi de notre cohorte. L’intérêt des anticorps neutralisants (AcNs) anti-BKV en tant que marqueur prédictif de la réplication BKV a ensuite été évalué dans une cohorte de 168 transplantés rénaux. Nous avons montré i) que le virus responsable de l’infection provenait du donneur ; ii) que les AcNs jouent un rôle dans la prévention de la réactivation et le contrôle de la réplication virale et iii) qu’un seuil d’AcNs de 4 log10 permettait de stratifier le risque de réplication BKV. Ce travail ouvre la voie à un suivi personnalisé en fonction du risque de réplication BKV et à de nouvelles approches immunothérapeutiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">BK virus (BKV)-associated nephropathy is one of the major causes of graft dysfunction and loss in kidney transplant recipients. Since no BKV-specific antiviral therapies are available, management relies on preemptive immunosuppression reduction based on viral load monitoring. However, this strategy does not fully eliminate the risk of nephropathy and can increase the risk of graft rejection. In this work, we evaluated viral load measurement by quantitative real-time PCR in an interlaboratory comparison. Variability factors such as BKV polymorphism or pre-PCR steps have been highlighted and the method used for monitoring our cohort has been validated. The role of anti-BKV neutralizing antibodies (NAbs) as a predictive marker of BKV replication has been investigated in a cohort of 168 kidney transplant recipients. We showed that i) viral infection is caused by the donor strain; ii) NAbs play an essential role in viral replication prevention and control and iii) a NAbs cutoff of 4 log10 allows to stratify BKV replication risk. This work paves the way for personalized monitoring according to BKV replication risk and for new preventive or therapeutic strategies.</dcterms:abstract>
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