12 research outputs found

    MICROSCOPE mission: first results of a space test of the equivalence principle

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    According to the weak equivalence principle, all bodies should fall at the same rate in a gravitational field. The MICROSCOPE satellite, launched in April 2016, aims to test its validity at the 10−15 precision level, by measuring the force required to maintain two test masses (of titanium and platinum alloys) exactly in the same orbit. A nonvanishing result would correspond to a violation of the equivalence principle, or to the discovery of a new long-range force. Analysis of the first data gives δ(Ti,Pt)=[−1±9(stat)±9(syst)]×10−15 (1σ statistical uncertainty) for the titanium-platinum Eötvös parameter characterizing the relative difference in their free-fall accelerations

    Variabilité pharmacocinétique des anticorps thérapeutiques

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    Les anticorps thérapeutiques sont de plus en plus utilisés dans le traitement de différentes pathologies, dont les cancers et les maladies inflammatoires chroniques. La variabilité pharmacocinétique interindividuelle des anticorps est grande et influence la réponse clinique. Certaines caractéristiques de l’individu jouent un rôle majeur car elles modifient fortement cette pharmacocinétique, telles les dimensions corporelles, l’immunisation contre les anticorps thérapeutiques utilisés ou la masse antigénique. D’autres jouent un rôle mineur, comme l’âge, le sexe ou des polymorphismes génétiques. Cette variabilité doit être décrite avec soin pour déterminer le schéma posologique optimal

    A Validated LC-MS/MS Method for Performing Belatacept Drug Monitoring in Renal Transplantation

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    Belatacept, a CTLA4-Ig, was designed to prevent rejection and graft loss in kidney transplant recipients. This immunotherapy showed a long-term clinical benefit mainly on renal function and better glycemic control but was also associated with a higher number of severe infectious diseases, particularly CMV disease, and lymphoproliferative disease. Therapeutic drug monitoring usually guides the benefit–risk assessment of long-term immunosuppression. In this study, an analytical method by LC-MS/MS was developed in 20 microL of plasma for the belatacept quantification. Intra- and inter-assay precision and accuracy were lower than 20% for the limit of quantification, and 15% for higher concentrations. The method was implemented in our lab and provided data about the inter-variability (N = 108) and intra-variability (N = 33) of belatacept concentrations in kidney transplant recipients with a stable renal function, after conversion from a CNI- to a belatacept-based regimen
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