Xavier Charles Leber

ORCID: 0000-0001-7060-8845
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About
Contact & Profiles
Research Areas
  • Monoclonal and Polyclonal Antibodies Research
  • Glycosylation and Glycoproteins Research
  • Lung Cancer Research Studies
  • Chronic Lymphocytic Leukemia Research
  • Peptidase Inhibition and Analysis
  • T-cell and B-cell Immunology
  • vaccines and immunoinformatics approaches
  • Bacterial Infections and Vaccines
  • Complement system in diseases
  • CAR-T cell therapy research
  • Cytomegalovirus and herpesvirus research
  • Immune Cell Function and Interaction
  • Diabetes and associated disorders
  • Biochemical and Structural Characterization
  • Full-Duplex Wireless Communications
  • Immunotherapy and Immune Responses
  • Polyomavirus and related diseases
  • Ocular Diseases and Behçet’s Syndrome
  • Celiac Disease Research and Management
  • Muscle metabolism and nutrition
  • Muscle Physiology and Disorders
  • Nutrition and Health in Aging
  • Antenna Design and Analysis

Novartis Institutes for BioMedical Research
2016-2024

Novartis (Switzerland)
2016-2024

The TGF-β family ligands myostatin, GDF11, and activins are negative regulators of skeletal muscle mass, which have been reported to primarily signal via the ActRIIB receptor on thereby induce wasting described as cachexia. Use a soluble ActRIIB-Fc "trap," block myostatin pathway signaling in normal or cachectic mice leads hypertrophy prevention loss, perhaps suggesting that is responsible for growth regulation. Genetic evidence demonstrates however both ActRIIB- ActRIIA-deficient display...

10.1073/pnas.1707925114 article EN cc-by-nc-nd Proceedings of the National Academy of Sciences 2017-11-06

In October 2019, Novartis launched brolucizumab, a single-chain variable fragment molecule targeting vascular endothelial growth factor A, for the treatment of neovascular age-related macular degeneration. 2020, rare cases retinal vasculitis and/or occlusion (RV/RO) were reported, often during first few months after initiation, consistent with possible immunologic pathobiology. This finding was inconsistent preclinical studies in cynomolgus monkeys that demonstrated no drug-related...

10.1126/scitranslmed.abq5241 article EN Science Translational Medicine 2023-02-01

Abstract Type 1 diabetes (T1D) is characterized by a chronic, progressive autoimmune attack against pancreas-specific antigens, effecting the destruction of insulin-producing β-cells. Here we show interleukin-2 (IL-2) non-pancreatic target in T1D. Anti-IL-2 autoantibodies, as well T cells specific for single orthologous epitope IL-2, are present peripheral blood non-obese diabetic (NOD) mice and patients with In NOD mice, generation anti-IL-2 autoantibodies genetically determined their titre...

10.1038/ncomms13027 article EN cc-by Nature Communications 2016-10-06

Reactivation of BK polyomavirus (BKPyV) can cause significant kidney and bladder disease in immunocompromised patients. There are currently no effective, BKPyV-specific therapies. MAU868 is a novel, human immunoglobulin (Ig) G1 monoclonal antibody that binds the major capsid protein, VP1, BKPyV with picomolar affinity, neutralizes infection by 4 genotypes (EC

10.1016/j.ajt.2024.07.002 article EN cc-by-nc-nd American Journal of Transplantation 2024-07-10

Abstract During bacterial pathogenesis extensive contacts between the human and extracellular proteomes take place. The identification of novel host-pathogen interactions by standard methods using a case-by-case approach is laborious time consuming. To overcome this limitation, we took advantage large libraries recombinant proteins. We applied large-scale protein microarray-based screening on two important pathogens different approaches: (I) 75 proteins were tested 159 spotted Staphylococcus...

10.1038/srep27996 article EN cc-by Scientific Reports 2016-06-15

A main feature of Wiskott-Aldrich syndrome (WAS) is increased susceptibility to autoimmunity. key contribution B cells development these complications has been demonstrated through studies samples from affected individuals and mouse models the disease, but role WAS protein (WASp) in controlling peripheral tolerance not specifically explored. Here we show that cell responses remain T dependent constitutive WASp-deficient mice, whereas selective WASp deletion germinal center (GCBs) sufficient...

10.1016/j.celrep.2022.110474 article EN cc-by-nc-nd Cell Reports 2022-03-01

The sole inhibitory Fcγ receptor CD32b (FcγRIIb) is expressed throughout B and plasma cell development on their malignant counterparts. expression cells known to provide a mechanism of resistance rituximab that can be ameliorated with CD32b-blocking antibody. CD32b, therefore, represents an attractive tumor antigen for targeting monoclonal antibody (mAb). To this end, two anti-CD32b mAbs, NVS32b1 NVS32b2, were developed. Their complementarity-determining regions (CDR) bind the Fc binding...

10.1158/1535-7163.mct-19-0003 article EN Molecular Cancer Therapeutics 2020-08-26

<div>Abstract<p>The sole inhibitory Fcγ receptor CD32b (FcγRIIb) is expressed throughout B and plasma cell development on their malignant counterparts. expression cells known to provide a mechanism of resistance rituximab that can be ameliorated with CD32b-blocking antibody. CD32b, therefore, represents an attractive tumor antigen for targeting monoclonal antibody (mAb). To this end, two anti-CD32b mAbs, NVS32b1 NVS32b2, were developed. Their complementarity-determining regions...

10.1158/1535-7163.c.6538581.v1 preprint EN 2023-04-03

<div>Abstract<p>The sole inhibitory Fcγ receptor CD32b (FcγRIIb) is expressed throughout B and plasma cell development on their malignant counterparts. expression cells known to provide a mechanism of resistance rituximab that can be ameliorated with CD32b-blocking antibody. CD32b, therefore, represents an attractive tumor antigen for targeting monoclonal antibody (mAb). To this end, two anti-CD32b mAbs, NVS32b1 NVS32b2, were developed. Their complementarity-determining regions...

10.1158/1535-7163.c.6538581 preprint EN 2023-04-03
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