Leslie D Lowe

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IFNalpha/beta, IL-12, and IL-15 regulate NK cell activation and expansion, but signals triggering resolution of the NK response upon induction of adaptive immunity remain to be defined. We now report that IL-21, a product of activated T cells, may serve this function. Mice lacking IL-21R (IL-21R(-/-)) had normal NK cell development but no detectable(More)
Experimental autoimmune encephalomyelitis (EAE) is induced in the SJL/J mouse by adoptive transfer of activated proteolipid protein peptide (PLP) 139-151-specific Th1 cells. T cells responding to altered peptide ligands (APL) of PLP, previously shown to induce Th2 differentiation and regulate disease in PLP-immunized mice, do not transfer EAE. However, the(More)
Previously we have reported the purification and characterization of a novel cytokine from an EBV-transformed B cell line, RPMI 8866. This factor, termed natural killer cell stimulatory factor (NKSF), possessed pleiotropic activities including the induction of IFN-gamma from PBL, enhancement of cytotoxicity by NK cells, and stimulation of the proliferation(More)
OBJECTIVE Interleukin-21 (IL-21) is a T cell-derived cytokine that modulates T cell, B cell, and natural killer cell responses. In this study, the effects of blocking IL-21 were examined in 2 rodent models of rheumatoid arthritis (RA) to determine whether IL-21 contributes to their pathologic processes. METHODS DBA/1 mice were immunized with bovine type(More)
Cultured human monocytes undergo a process of differentiation and maturation lasting 5 to 10 days that ultimately leads to the appearance of large macrophage-like cells. This differentiation is growth factor dependent: of all the cytokines tested, only macrophage colony-stimulating factor (M-CSF), granulocyte/macrophage-CSF (GM-CSF), and IL-3 proved capable(More)
Using phage display, we generated a panel of optimized neutralizing antibodies against the human and mouse receptors for interleukin 21 (IL-21), a cytokine that is implicated in the pathogenesis of many types of autoimmune disease. Two antibodies, Ab-01 and Ab-02, which differed by only four amino acids in V(L) CDR3, showed potent inhibition of human and(More)
Development of long-term humoral immunity, characterized by the formation of long-lived plasma cells (PCs) in the bone marrow and memory B cells, is a critical component of protective immunity to pathogens, and as such it is the major goal of vaccination. However, the mechanisms involved in the generation of long-term humoral immunity remain poorly(More)
Background IL-21 is secreted by activated T cells and modulates immune cell functions with both proinflammatory and anti-inflammatory effects. IL-21 receptor (IL-21R), homologous to IL-2Rβ and IL-4Rα, associates with the gamma common chain upon ligand binding. It was recently described that IL-21R is overexpressed in the inflamed synovial membrane and on(More)
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