DMTs and Covid-19 severity in MS: a pooled analysis from Italy and France

We evaluated the effect of DMTs on Covid-19 severity in patients with MS, with a pooled-analysis of two large cohorts from Italy and France. The association of baseline characteristics and DMTs with Covid-19 severity was assessed by multivariate ordinal-logistic models and pooled by a fixed-effect meta-analysis. 1066 patients with MS from Italy and 721 from France were included. In the multivariate model, anti-CD20 therapies were significantly associated (OR = 2.05, 95%CI = 1.39–3.02, p < 0.001) with Covid-19 severity, whereas interferon indicated a decreased risk (OR = 0.42, 95%CI = 0.18–0.99, p = 0.047). This pooled-analysis confirms an increased risk of severe Covid-19 in patients on anti-CD20 therapies and supports the protective role of interferon

ROLE DU COMPLEXE MAJEUR D'HISTOCOMPATIBILITE DE CLASSE 1 DANS LA RESISTANCE A LA RESISTANCE DU VIRUS DE THEILER

PARIS-BIUSJ-Physique recherche (751052113) / SudocCentre Technique Livre Ens. Sup. (774682301) / SudocSudocFranceF

Roles of the H-2D b and H-K b genes in resistance to persistent Theiler's murine encephalomyelitis virus infection of the central nervous system

International audienceTheiler's murine encephalomyelitis virus, a member of the Picornaviridae family, persists in the spinal cord of susceptible strains of mice. Resistant strains of mice, such as the H-2 b strain, clear the virus infection after an acute encephalomyelitis. The H-2D locus, but not the H-2K locus, has a major effect on this resistance, although both loci code for MHC class I molecules with similar general properties. For the present work, we rendered susceptible H-2 q FVB/N mice transgenic for either the H-2D b gene, the H-2K b gene or a chimeric H-2D b /K b gene in which the exons encoding the peptide-binding groove of the H-2K b gene have been replaced by those of the H-2D b gene. Mice transgenic for either the H-2D b gene or the chimeric H-2D b /K b gene were significantly more resistant to persistent virus infection than mice transgenic for the H-2K b gene, suggesting that the difference in the effects of the H-2D b gene and the H-2K b gene are due to the nature of the peptides presented by these class I molecules

Prédisposition de la souris à la démyélinisation induite par le virus de Theiler : intérêt et contraintes d'un modèle animal

International audienceL'infection par le virus de Theiler a été successivement un modèle murin de la poliomyélite et de la sclérose en plaques. Après la présentation de ce qu'il est possible d'attendre d'un modèle animal, l'intérêt de la démyélinisation induite par le virus de Theiler sera exposé dans le cadre des maladies multifactorielles à déterminisme génétique complexe

Motor chronic inflammatory demyelinating polyneuropathy ( CIDP ) in 17 patients: Clinical characteristics, electrophysiological study, and response to treatment

International audienceMotor chronic inflammatory demyelinating polyneuropathy (CIDP) is a rare and poorly described subtype of CIDP. We aimed to study their clinical and electrophysiological characteristics and response to treatment. From a prospective database of CIDP patients, we included patients with definite or probable CIDP with motor signs and without sensory signs/symptoms at diagnosis. Patients were considered to have pure motor CIDP (PM-CIDP) if sensory conductions were normal or to have motor predominant CIDP (MPred-CIDP) if ≥2 sensory nerve action potential amplitudes were abnormal. Among the 700 patients with CIDP, 17 (2%) were included (PM-CIDP n = 7, MPred-CIDP n = 10); 71% were male, median age at onset was 48 years (range: 13-76 years), 47% had an associated inflammatory or infectious disease or neoplasia. At the more severe disease stage, 94% of patients had upper and lower limb weakness, with distal and proximal weakness in 4 limbs for 56% of them. Three-quarters (75%) responded to intravenous immunoglobulins (IVIg) and four of five patients to corticosteroids including three of three patients with MPred-CIDP. The most frequent conduction abnormalities were conduction blocks (CB, 82%) and F-wave abnormalities (88%). During follow up, 4 of 10 MPred-CIDP patients developed mild sensory symptoms; none with PM-CIDP did so. Patients with PM-CIDP had poorer outcome (median ONLS: 4; range: 22-5) compared to MPred-CIDP (2, range: 0-4; P = .03) at last follow up. This study found a progressive clinical course in the majority of patients with motor CIDP as well as frequent associated diseases, CB, and F-wave abnormalities. Corticosteroids might be considered as a therapeutic option in resistant IVIg patients with MPred-CIDP

A genetic approach to study the pathogenesis of Theiler's virus persistent infection.

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