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Influenza 5xM2e mRNA lipid nanoparticle vaccine confers broad immunity and significantly enhances the efficacy of inactivated split vaccination when coadministered.
J Immunol
January 2025
Center for Inflammation, Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, GA, United States.
Current influenza vaccines are not effective in conferring protection against antigenic variants and pandemics. To improve cross-protection of influenza vaccination, we developed a 5xM2e messenger RNA (mRNA) vaccine encoding the tandem repeat conserved ectodomain (M2e) of ion channel protein M2 derived from human, swine, and avian influenza A viruses. The lipid nanoparticle (LNP)-encapsulated 5xM2e mRNA vaccine was immunogenic, eliciting high levels of M2e-specific IgG antibodies, IFN-γ+ T cells, T follicular helper cells, germinal center phenotypic B cells, and plasma cells.
View Article and Find Full Text PDFEarly expansion of TIGIT+PD1+ effector memory CD4 T cells via agonistic effect of alefacept in new-onset type 1 diabetes.
J Immunol
January 2025
Center for Translational Immunology, Benaroya Research Institute, Seattle, WA, United States.
The CD2-depleting drug alefacept (LFA3-Ig) preserved beta cell function in new-onset type 1 diabetes (T1D) patients. The most promising biomarkers of response were late expansion of exhausted CD8 T cells and rare baseline inflammatory islet-reactive CD4 T cells, neither of which can be used to measure responses to drug in the weeks after treatment. Thus, we investigated whether early changes in T cell immunophenotypes could serve as biomarkers of drug activity.
View Article and Find Full Text PDFThe neurorepellent SLIT2 inhibits LPS-induced proinflammatory signaling in macrophages.
J Immunol
January 2025
Program in Cell Biology, The Hospital for Sick Children, Toronto, ON, Canada.
Macrophages are important mediators of immune responses with critical roles in the recognition and clearance of pathogens, as well as in the resolution of inflammation and wound healing. The neuronal guidance cue SLIT2 has been widely studied for its effects on immune cell functions, most notably directional cell migration. Recently, SLIT2 has been shown to directly enhance bacterial killing by macrophages, but the effects of SLIT2 on inflammatory activation of macrophages are less known.
View Article and Find Full Text PDFLipin-1 restrains macrophage lipid synthesis to promote inflammation resolution.
J Immunol
January 2025
Department of Microbiology and Immunology, Louisiana State University Health Sciences Center, Shreveport, LA, United States.
Macrophages are critical to maintaining and restoring tissue homeostasis during inflammation. The lipid metabolic state of macrophages influences their function and polarization, which is crucial to the resolution of inflammation. The contribution of lipid synthesis to proinflammatory macrophage responses is well understood.
View Article and Find Full Text PDFSuppression of NF-κB and downstream XBP1 by DcR3 contributes to a decrease in antibody secretion.
J Immunol
January 2025
Institute of Microbiology and Immunology, National Yang Ming Chiao Tung University, Taipei City, Taiwan.
Decoy receptor 3 (DcR3), a soluble receptor in the tumor necrosis factor receptor superfamily, regulates the functions of monocytes, macrophages, dendritic cells, and T cells. Previous studies have demonstrated that DcR3 suppresses B cell proliferation in vitro and ameliorates autoimmune diseases in animal models; however, whether and how DcR3 regulates antibody production is unclear. Using a DcR3 transgenic mouse model, we found that DcR3 impaired the T cell-dependent antigen-stimulated antibody response.
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