Ontology highlight
ABSTRACT:
PROVIDER: PRJNA127865 | ENA |
REPOSITORIES: ENA
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Project description:This SuperSeries is composed of the following subset Series: GSE22768: Systems analysis of the Merck Ad5/HIV vaccine reveals robust induction of a core innate immune gene network: in vivo analysis GSE22769: Systems analysis of the Merck Ad5/HIV vaccine reveals robust induction of a core innate immune gene network: in vitro analysis To better understand how innate immune responses to vaccination can lead to lasting protective immunity, we used a systems approach to define immune signatures in humans over 1 wk following MRKAd5/HIV vaccination that predicted subsequent HIV-specific T-cell responses. Within 24 h, striking increases in peripheral blood mononuclear cell gene expression associated with inflammation, IFN response, and myeloid cell trafficking occurred, and lymphocyte-specific transcripts decreased. These alterations were corroborated by marked serum inflammatory cytokine elevations and egress of circulating lymphocytes. Responses of vaccinees with preexisting adenovirus serotype 5 (Ad5) neutralizing antibodies were strongly attenuated, suggesting that enhanced HIV acquisition in Ad5-seropositive subgroups in the Step Study may relate to the lack of appropriate innate activation rather than to increased systemic immune activation. Importantly, patterns of chemoattractant cytokine responses at 24 h and alterations in 209 peripheral blood mononuclear cell transcripts at 72 h were predictive of subsequent induction and magnitude of HIV-specific CD8(+) T-cell responses. This systems approach provides a framework to compare innate responses induced by vectors, as shown here by contrasting the more rapid, robust response to MRKAd5/HIV with that to yellow fever vaccine. When applied iteratively, the findings may permit selection of HIV vaccine candidates eliciting innate immune response profiles more likely to drive HIV protective immunity. Refer to individual Series
2012-11-20 | E-GEOD-22822 | biostudies-arrayexpress
Project description:To better understand how innate immune responses to vaccination can lead to lasting protective immunity, we used a systems approach to define immune signatures in humans over 1 wk following MRKAd5/HIV vaccination that predicted subsequent HIV-specific T-cell responses. Within 24 h, striking increases in peripheral blood mononuclear cell gene expression associated with inflammation, IFN response, and myeloid cell trafficking occurred, and lymphocyte-specific transcripts decreased. These alterations were corroborated by marked serum inflammatory cytokine elevations and egress of circulating lymphocytes. Responses of vaccinees with preexisting adenovirus serotype 5 (Ad5) neutralizing antibodies were strongly attenuated, suggesting that enhanced HIV acquisition in Ad5-seropositive subgroups in the Step Study may relate to the lack of appropriate innate activation rather than to increased systemic immune activation. Importantly, patterns of chemoattractant cytokine responses at 24 h and alterations in 209 peripheral blood mononuclear cell transcripts at 72 h were predictive of subsequent induction and magnitude of HIV-specific CD8(+) T-cell responses. This systems approach provides a framework to compare innate responses induced by vectors, as shown here by contrasting the more rapid, robust response to MRKAd5/HIV with that to yellow fever vaccine. When applied iteratively, the findings may permit selection of HIV vaccine candidates eliciting innate immune response profiles more likely to drive HIV protective immunity. This SuperSeries is composed of the SubSeries listed below.
2012-11-20 | GSE22822 | GEO
Project description:Here we applied a systems approach to define human innate immune signatures following MRKAd5/HIV immunization and to analyze the effects of pre-existing Ad5 immunity. To determine whether vaccine-induced changes could be ascribed to cell-intrinsic responses rather than cell population fluxes, fresh PBMC from independent Ad5Neg donors were stimulated in vitro with MRKAd5 vector lacking HIV-1 transgenes (MRKAd5). 22 total samples were analyzed. 14 of these are from in vivo vaccination of seven Ad5 seronegative subjects at two time points (0hr and 24hrs). 8 of these are from 24hr in vitro stimulation of PBMCs from four independent Ad5 seronegative donors with MRKAd5 empty vector or GTS buffer (Mock) at 20,000 viral particles per cell.
2012-11-20 | E-GEOD-22769 | biostudies-arrayexpress
Project description:Here we applied a systems approach to define human innate immune signatures following MRKAd5/HIV immunization and to analyze the effects of pre-existing Ad5 immunity. We defined the global early immune response to MRKAd5/HIV by profiling the PBMC transcriptomes from seven Ad5Neg individuals pre- and post-vaccination in vivo. Since the Step Study results suggested a deleterious effect of pre-existing Ad5 nAb on vaccine immunogenicity, we examined the vaccine-induced transcriptional responses from two Ad5Med and one Ad5Low individual
2012-11-20 | GSE22768 | GEO
Project description:Here we applied a systems approach to define human innate immune signatures following MRKAd5/HIV immunization and to analyze the effects of pre-existing Ad5 immunity. To determine whether vaccine-induced changes could be ascribed to cell-intrinsic responses rather than cell population fluxes, fresh PBMC from independent Ad5Neg donors were stimulated in vitro with MRKAd5 vector lacking HIV-1 transgenes (MRKAd5).
2012-11-20 | GSE22769 | GEO
Project description:Here we applied a systems approach to define human innate immune signatures following MRKAd5/HIV immunization and to analyze the effects of pre-existing Ad5 immunity. We defined the global early immune response to MRKAd5/HIV by profiling the PBMC transcriptomes from seven Ad5Neg individuals pre- and post-vaccination in vivo. Since the Step Study results suggested a deleterious effect of pre-existing Ad5 nAb on vaccine immunogenicity, we examined the vaccine-induced transcriptional responses from two Ad5Med and one Ad5Low individual 50 total samples were analyzed. This includes 5 time points post vaccination with MRKAd5/HIV for 10 independent human subjects. The time points were 0hr, 6hrs, 24hrs, 72hrs, and 168hrs. Seven of the subjects did not have pre-existing neutralizing antibodies to the vaccine vector (Ad5Neg). One subject had low level pre-existing neutralizing antibodies to the vaccine vector (Ad5Low). Two subjects had moderate level pre-existing neutralizing antibodies to the vaccine vector (Ad5Low).
2012-11-20 | E-GEOD-22768 | biostudies-arrayexpress
Project description:Replicating viruses have broad applications in biomedicine, notably in cancer virotherapy and in the design of attenuated vaccines, however uncontrolled virus replication in vulnerable tissues can give pathology and often restricts the use of potent strains. Increased knowledge of tissue-selective microRNA expression now affords the possibility of engineering replicating viruses that are attenuated at the RNA level in sites of potential pathology, but retain wild type replication activity at sites not expressing the relevant microRNA. To assess the usefulness of this approach for the DNA virus, adenovirus, we have engineered a hepatocyte-safe wild type adenovirus 5 (Ad5), which normally mediates significant toxicity and is potentially lethal in mice. To do this we have included binding sites for hepatocyte-selective microRNA122a within the 3' UTR of the E1A transcription cassette. Imaging versions of these viruses, produced by fusing E1A with luciferase, showed that inclusion of microRNA122a binding sites caused up to 80 fold decreased hepatic expression of E1A following intravenous delivery to mice. Animals administered a ten-times lethal dose of wild type Ad5 (5 x 1010 viral particles/mouse) showed substantial hepatic genome replication and extensive liver pathology, while inclusion of 4 microRNA binding sites decreased replication 50-fold and virtually abrogated liver toxicity. This modified wild type virus retained full activity within cancer cells and provides a potent, liver-safe oncolytic virus. In addition to providing many potent new viruses for cancer virotherapy, microRNA-control of virus replication should provide a new strategy for designing safe attenuated vaccines applied across a broad range of viral diseases. four groups which we had were: WT: RNA extracted from livers of mice treated with wild type Ad5, 3 Replicates miR: RNA extracted from livers of mice treated with wild type Ad5 bearing mir122-binding sites in the 3'UTR of E1A (3 Replicates) Luc: RNA extracted from livers of mice treated with non-replicating Ad5 (3 Replicates) PBS: RNA extracted from livers of mice treated with PBS only (3 Replicates)
2011-08-19 | E-GEOD-23854 | biostudies-arrayexpress
Project description:Systems analysis of the Merck Ad5/HIV vaccine reveals robust induction of a core innate immune gene network: in vivo analysis
| PRJNA129109 | ENA
Project description:Systems analysis of the Merck Ad5/HIV vaccine reveals robust induction of a core innate immune gene network: in vitro analysis
| PRJNA129111 | ENA
Project description:Viral vectors are attractive vaccine platforms that elicit robust innate and adaptive immune responses; however, viral vector vaccine candidates vary greatly in their ability to induce protective immunity. Ad5 vectors elicit robust CD8+ T cell responses but typically characterized by an exhausted phenotype. The mechanisms by which Ad5 vectors induce dysfunctional CD8+ T cells have not been fully elucidated. Here we demonstrate that Ad5 vectors, but not Ad26 vectors, elicit exhausted antigen-specific IL-10+PD1+ CD4+ T cells with a dysfunctional transcriptional profile, and these cells effectively suppress CD8+ T cells responses in vivo. Induction of inhibitory CD4+ T cells by Ad5 vectors was associated with increased IL-27 expression, and IL-27 blockade improved CD4+ T cell polyfunctionality. Together our data highlight a novel role for IL-27 in regulating responses to viral vector vaccines. Splenic CD45.2+ OT-II TCR-Tg CD4 T cells from CD45.1+ B6 mice immunized with Ad5-OVA or Ad26-OVA were purified by FACS on day 10 post-immunization
2016-06-01 | E-GEOD-73118 | biostudies-arrayexpress