Publications by authors named "Michelle A Sallin"

Article Synopsis
  • The study focuses on understanding T cell behavior in response to Mycobacterium tuberculosis (Mtb) infection, particularly their role in granulomas, which are immune structures around infection sites.
  • Researchers compared gene expression in T cells from different sources (granulomas, bronchoalveolar lavage, and blood) in infected rhesus macaques, highlighting CD30 as a key gene upregulated in CD4 and CD8 T cells within granulomas.
  • Findings suggest that CD30 is crucial for the survival and effective immune response of CD4 T cells against Mtb, indicating its potential as a target for improving tuberculosis treatment.
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Circulating Klotho peptide hormone has anti-aging activity and affects tissue maintenance. Hypomorphic mutant Klotho [] mice on C57BL/6xC3H, BALB/c and 129 genetic backgrounds, show decreased Klotho expression that correlate with accelerated aging including pre-mature death due to abnormally high levels of serum vitamin D. These mice also show multiple impairments in the immune system.

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The specific chemokine receptors utilized by Th1 cells to migrate into the lung during infection are unknown. We previously showed in mice that CXCR3 Th1 cells enter the lung parenchyma and suppress growth, while CX3CR1 KLRG1 Th1 cells accumulate in the lung vasculature and are nonprotective. Here we quantify the contributions of these chemokine receptors to the migration and entry rate of Th1 cells into -infected lungs using competitive adoptive transfer migration assays and mathematical modeling.

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In mutant mice, reduced levels of Klotho promoted high levels of active vitamin D in the serum. Genetic or dietary manipulations that diminished active vitamin D alleviated aging-related phenotypes caused by Klotho down-regulation. The hypomorphic Klotho [kl/kl] allele that decreases Klotho expression in C3H, BALB/c, 129, and C57BL/6 genetic backgrounds substantially increases 1,25(OH)2D3 levels in the sera of susceptible C3H, BALB/c, and 129, but not C57BL/6 mice.

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Mycobacterium tuberculosis infection (Mtb) is the leading cause of death due to a single infectious agent and is among the top ten causes of all human deaths worldwide. CD4 T cells are essential for resistance to Mtb infection, and for decades it has been thought that IFNγ production is the primary mechanism of CD4 T-cell-mediated protection. However, IFNγ responses do not correlate with host protection, and several reports demonstrate that additional anti-tuberculosis CD4 T-cell effector functions remain unaccounted for.

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Mucosal-associated invariant T cells (MAITs) are positioned in airways and may be important in the pulmonary cellular immune response against infection, particularly prior to priming of peptide-specific T cells. Accordingly, there is interest in the possibility that boosting MAITs through tuberculosis (TB) vaccination may enhance protection, but MAIT responses in the lungs during tuberculosis are poorly understood. In this study, we compared pulmonary MAIT and peptide-specific CD4 T cell responses in -infected rhesus macaques using 5-OP-RU-loaded MR-1 tetramers and intracellular cytokine staining of CD4 T cells following restimulation with an -derived epitope megapool (MTB300), respectively.

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Recent data indicate that the differentiation state of Th1 cells determines their protective capacity against tuberculosis. Therefore, we examined the role of Th1-polarizing factors in the generation of protective and non-protective subsets of Mtb-specific Th1 cells. We find that IL-12/23p40 promotes Th1 cell expansion and maturation beyond the CD73CXCR3T-bet stage, and T-bet prevents deviation of Th1 cells into Th17 cells.

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IFN-γ-producing CD4 T cells are required for protection against Mycobacterium tuberculosis (Mtb) infection, but the extent to which IFN-γ contributes to overall CD4 T cell-mediated protection remains unclear. Furthermore, it is not known if increasing IFN-γ production by CD4 T cells is desirable in Mtb infection. Here we show that IFN-γ accounts for only ~30% of CD4 T cell-dependent cumulative bacterial control in the lungs over the first six weeks of infection, but >80% of control in the spleen.

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Agonistic monoclonal antibodies (mAbs) directed against the co-signaling molecule CD137 (4-1BB) elicit potent anti-tumor immunity in mice. This anti-tumor immunity has traditionally been thought to result from the ability of the Fab portion of anti-CD137 to function as an analog for CD137L. Although binding of CD137 by anti-CD137 mAbs has the potential to cross-link the Fc fragments, enabling Fc engagement of low to moderate affinity Fc gamma receptors (FcγR), the relative import of such Fc-FcγR interactions in mediating anti-CD137 associated anti-tumor immunity is unknown.

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In vitro assessment of lymphocyte and natural killer (NK) cell cytotoxicity typically employs density gradient centrifugation and magnetic cell separation to isolate effector cells, and chromium release to assess cytotoxicity. In order to improve the rapidity and scalability of in vitro cytotoxicity assessment, we evaluated the efficacy of a protocol utilizing tetrameric antibody complexes and SepMate™ isolation tubes to negatively select NK cells (TACs/Sep), and calcein-AM release to measure cytotoxicity. We compared the efficiency and accuracy of this protocol to a conventional approach employing density gradient centrifugation and magnetically labeled antibodies (DG/MACS) to isolate NK cells and chromium release to measure cytotoxicity.

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