scholarly journals Effects of Interleukin-12 and Interleukin-15 on Measles-Specific T-Cell Responses in Vaccinated Infants

2008 ◽  
Vol 21 (2) ◽  
pp. 163-172 ◽  
Author(s):  
Hayley A. Gans ◽  
Linda L. Yasukawa ◽  
Cathryn Z. Zhang ◽  
Rima Hanna Wakim ◽  
Mary Rinki ◽  
...  
Keyword(s):  
T Cell ◽  
T Cell Responses ◽  
Interleukin 12 ◽  
Cell Responses ◽  
Interleukin 15

The effects of interleukin-15 on human γδ T cell responses to Plasmodium falciparum in vitro

1998 ◽  
Vol 64 (2-3) ◽  
pp. 125-132 ◽  
Author(s):  
M Merle Elloso ◽  
Marianne Wallace ◽  
D.D Manning ◽  
William P Weidanz
Keyword(s):  
Plasmodium Falciparum ◽  
T Cell ◽  
T Cell Responses ◽  
Γδ T Cell ◽  
Cell Responses ◽  
Interleukin 15

scholarly journals CpG and Interleukin-15 Synergize to Enhance IFN-γ Production by Activated CD8+T Cells

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Dustin Cobb ◽  
Siqi Guo ◽  
Ronald B. Smeltz
Keyword(s):  
T Cells ◽  
T Cell ◽  
T Cell Responses ◽  
Dependent Manner ◽  
Infectious Agents ◽  
Cell Responses ◽  
Striking Increase ◽  
Physiological Relevance ◽  
Interleukin 15 ◽  
Ifn Γ

Interleukin-15 (IL-15) regulates the development and maintenance of memory CD8+T cells. Paradoxically, we previously reported that IL-15 could enhance CD8+T-cell responses to IL-12, a proinflammatory cytokine required for optimal priming of effector CD8+T cells. To expand the physiological relevance of these findings, we tested IL-15 for its ability to enhance T-cell responses to bacterial CpG. Expectedly, CpG enhanced the production of IFN-γby CD8+T cells polyclonally activated with anti-CD3. However, addition of IL-15 to CpG-stimulated cultures led to a striking increase in IFN-γproduction. The effect of CpG and IL-15 was also evident with CD8+T cells recovered from mice infected with the parasiteTrypanosoma cruzi(T. cruzi) and restimulated with antigen. The observed synergy between CpG and IL-15 occurred in an IL-12-dependent manner, and this effect could even be demonstrated in cocultures of activated CD8+T cells and CD4+CD25+regulatory T cells. Although IFN-γwas not essential for CpG-induced IL-12, the ability of CpG and IL-15 to act on CD8+T cells required expression of the IFN-γ-inducible transcription factor T-bet. These data have important implications for development of vaccines and design of therapies to boost CD8+T-cell responses to infectious agents and tumors.

Enhancing the immunostimulatory function of dendritic cells by transfection with mRNA encoding OX40 ligand

Blood ◽  
2005 ◽  
Vol 105 (8) ◽  
pp. 3206-3213 ◽  
Author(s):  
Jens Dannull ◽  
Smita Nair ◽  
Zhen Su ◽  
David Boczkowski ◽  
Christian DeBeck ◽  
...  
Keyword(s):  
Dendritic Cells ◽  
T Cell ◽  
T Cell Responses ◽  
Human Monocyte ◽  
Interleukin 12 ◽  
T Helper ◽  
Cell Responses ◽  
Mrna Transfection

Abstract The objective of this study was to investigate whether the immunostimulatory properties of human monocyte-derived dendritic cells (DCs) could be enhanced by triggering OX40/OX40L signaling. Since monocyte-derived DCs possess only low-cell surface levels of OX40L in the absence of CD40 signaling, OX40L was expressed by transfection of DCs with the corresponding mRNA. We show that OX40L mRNA transfection effectively enhanced the immunostimulatory function of DCs at multiple levels: OX40L mRNA transfection augmented allogeneic and HLA class II epitope-specific CD4+ T-cell responses, improved the stimulation of antigen-specific cytotoxic T lymphocytes (CTLs) in vitro without interfering with the prostaglandin E2 (PGE2)–mediated migratory function of the DCs, and facilitated interleukin 12 p70 (IL-12p70)–independent T helper type 1 (Th1) polarization of naive CD4+ T-helper cells. Furthermore, vaccination of tumor-bearing mice using OX40L mRNA–cotransfected DCs resulted in significant enhancement of therapeutic antitumor immunity due to in vivo priming of Th1-type T-cell responses. Our data suggest that transfection of DCs with OX40L mRNA may represent a promising strategy that could be applied in clinical immunotherapy protocols, while circumventing the current unavailability of reagents facilitating OX40 ligation.

scholarly journals Myeloid Dendritic Cells (DCs) of Mice Susceptible to Paracoccidioidomycosis Suppress T Cell Responses whereas Myeloid and Plasmacytoid DCs from Resistant Mice Induce Effector and Regulatory T Cells

2013 ◽  
Vol 81 (4) ◽  
pp. 1064-1077 ◽  
Author(s):  
Adriana Pina ◽  
Eliseu Frank de Araujo ◽  
Maíra Felonato ◽  
Flávio V. Loures ◽  
Claudia Feriotti ◽  
...  
Keyword(s):  
T Cells ◽  
Dendritic Cells ◽  
T Cell ◽  
Regulatory T Cells ◽  
T Cell Responses ◽  
Effector T Cells ◽  
Interleukin 12 ◽  
Content Type ◽  
Cell Responses ◽  
Plasmacytoid Dcs

ABSTRACTThe protective adaptive immune response in paracoccidioidomycosis, a mycosis endemic among humans, is mediated by T cell immunity, whereas impaired T cell responses are associated with severe, progressive disease. The early host response toParacoccidioides brasiliensisinfection is not known since the disease is diagnosed at later phases of infection. Our laboratory established a murine model of infection where susceptible mice reproduce the severe disease, while resistant mice develop a mild infection. This work aimed to characterize the influence of dendritic cells in the innate and adaptive immunity of susceptible and resistant mice. We verified thatP. brasiliensisinfection induced in bone marrow-derived dendritic cells (DCs) of susceptible mice a prevalent proinflammatory myeloid phenotype that secreted high levels of interleukin-12 (IL-12), tumor necrosis factor alpha, and IL-β, whereas in resistant mice, a mixed population of myeloid and plasmacytoid DCs secreting proinflammatory cytokines and expressing elevated levels of secreted and membrane-bound transforming growth factor β was observed. In proliferation assays, the proinflammatory DCs from B10.A mice induced anergy of naïve T cells, whereas the mixed DC subsets from resistant mice induced the concomitant proliferation of effector and regulatory T cells (Tregs). Equivalent results were observed during pulmonary infection. The susceptible mice displayed preferential expansion of proinflammatory myeloid DCs, resulting in impaired proliferation of effector T cells. Conversely, the resistant mice developed myeloid and plasmacytoid DCs that efficiently expanded gamma interferon-, IL-4-, and IL-17-positive effector T cells associated with increased development of Tregs. Our work highlights the deleterious effect of excessive innate proinflammatory reactions and provides new evidence for the importance of immunomodulation during pulmonary paracoccidioidomycosis.

scholarly journals Cell-surface bound pertussis toxin induces polyclonal T cell responses with high levels of interferon-γ in the absence of interleukin-12

2003 ◽  
Vol 33 (7) ◽  
pp. 1859-1868 ◽  
Author(s):  
Ayako Wakatsuki ◽  
Persephone Borrow ◽  
Kevin Rigley ◽  
Peter C. L. Beverley
Keyword(s):  
T Cell ◽  
Cell Surface ◽  
Pertussis Toxin ◽  
T Cell Responses ◽  
Interferon Γ ◽  
Interleukin 12 ◽  
Cell Responses

scholarly journals Contribution of Interleukin-12 p35 (IL-12p35) and IL-12p40 to Protective Immunity and Pathology in Mice Infected with Chlamydia muridarum

2013 ◽  
Vol 81 (8) ◽  
pp. 2962-2971 ◽  
Author(s):  
Lili Chen ◽  
Lei Lei ◽  
Zhou Zhou ◽  
Jie He ◽  
Sha Xu ◽  
...  
Keyword(s):  
T Cell ◽  
Chlamydial Infection ◽  
T Cell Responses ◽  
Host Responses ◽  
Interleukin 12 ◽  
Content Type ◽  
Chlamydia Muridarum ◽  
Cell Responses ◽  
Time Courses ◽  
Deficient Mice

ABSTRACTThe p35 molecule is unique to interleukin-12 (IL-12), while p40 is shared by both IL-12 and IL-23. IL-12 promotes Th1 T cell responses, while IL-23 promotes Th17 T cell responses. The roles of IL-12p35- and IL-12p40-mediated responses in chlamydial infection were compared in mice following an intravaginal infection withChlamydia muridarum. Mice deficient in either IL-12p35 or p40 both developed similar but prolonged infection time courses, confirming the roles of IL-12-mediated immune responses in clearing primary infection. However, all mice, regardless of genotype, cleared reinfection within 2 weeks, suggesting that an IL-12- or IL-23-independent adaptive immunity is protective against chlamydial infection. All infected mice developed severe oviduct hydrosalpinx despite the increased Th2 responses in IL-12p35- or IL-12p40-deficient mice, suggesting that Th2-dominant responses can contribute toChlamydia-induced inflammatory pathology. Compared to IL-12p35 knockout mice, the IL-12p40-deficient mice exhibited more extensive spreading of chlamydial organisms into kidney tissues, leading to significantly increased incidence of pyelonephritis, which both confirms the role of IL-12 or IL-23-independent host responses inChlamydia-induced pathologies and suggests that in the absence of IL-12/IFN-γ-mediated Th1 immunity, an IL-23-mediated response may play an important role in restricting chlamydial organisms from spreading into distal organs. These observations together provide important information for both understanding chlamydial pathogenesis and developing anti-Chlamydiavaccines.

Immunization With Melan-A Peptide-Pulsed Peripheral Blood Mononuclear Cells Plus Recombinant Human Interleukin-12 Induces Clinical Activity and T-Cell Responses in Advanced Melanoma

2003 ◽  
Vol 21 (12) ◽  
pp. 2342-2348 ◽  
Author(s):  
Amy C. Peterson ◽  
Helena Harlin ◽  
Thomas F. Gajewski
Keyword(s):  
T Cell ◽  
Peripheral Blood Mononuclear Cells ◽  
Mononuclear Cells ◽  
T Cell Responses ◽  
Advanced Melanoma ◽  
Interleukin 12 ◽  
Clinical Activity ◽  
Peripheral Blood Mononuclear ◽  
Cell Responses ◽  
Blood Mononuclear Cells

Purpose: Preclinical studies showed that immunization with peripheral blood mononuclear cells (PBMC) loaded with tumor antigen peptides plus interleukin-12 (IL-12) induced CD8+ T-cell responses and tumor rejection. We recently determined that recombinant human (rh) IL-12 at 30 to 100 ng/kg is effective as a vaccine adjuvant in patients. A phase II study of immunization with Melan-A peptide-pulsed PBMC + rhIL-12 was conducted in 20 patients with advanced melanoma. Patients and Methods: Patients were HLA-A2–positive and had documented Melan-A expression. Immunization was performed every 3 weeks with clinical re-evaluation every three cycles. Immune responses were measured by ELISpot assay before and after treatment and through the first three cycles, and were correlated with clinical outcome. Results: Most patients had received prior therapy and had visceral metastases. Nonetheless, two patients achieved a complete response, five patients achieved a minor or mixed response, and four patients had stable disease. The median survival was 12.25 months for all patients and was not yet reached for those with a normal lactate dehydrogenase. There were no grade 3 or 4 toxicities. Measurement of specific CD8+ T-cell responses by direct ex vivo ELISpot revealed a significant increase in interferon gamma–producing T cells against Melan-A (P = .015) after vaccination, but not against an Epstein-Barr virus control peptide (P = .86). There was a correlation between the magnitude of the increase in Melan-A–specific cells and clinical response (P = .046). Conclusion: This immunization approach may be more straightforward than dendritic cell strategies and seems to have clinical activity that can be correlated to a biologic end point.

Thalidomide Stimulates T Cell Responses and Interleukin 12 Production in HIV-Infected Patients

1999 ◽  
Vol 15 (13) ◽  
pp. 1169-1179 ◽  
Author(s):  
Patrick A.J. Haslett ◽  
Jeffrey D. Klausner ◽  
Sanit Makonkawkeyoon ◽  
Andre Moreira ◽  
Prasit Metatratip ◽  
...  
Keyword(s):  
T Cell ◽  
T Cell Responses ◽  
Interleukin 12 ◽  
Cell Responses
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