Short-term pIFN-α2a treatment does not significantly reduce the viral reservoir of SIV-infected, ART-treated rhesus macaques
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ABSTRACT:
ORGANISM(S): Macaca mulatta
PROVIDER: GSE114561 | GEO | 2018/05/17
REPOSITORIES: GEO
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Project description:In study NCT00594880, we successfully administered weekly doses of pegylated interferon-α-2a (Peg-IFN-α2a) with antiretroviral therapy (ART) for 5 weeks, before continued Peg-IFN-α2a monotherapy to 12 weeks (primary endpoint) in chronic HIV-infected subjects. Subjects maintaining HIV viral load <400 copies/ml by primary endpoint were defined as responders. We now describe innate immune correlates and transcriptional profiles associated with viral control and decrease in integrated HIV DNA after Peg-IFN-α2a immunotherapy. Peripheral blood samples were obtained prior to Peg-IFN-α2a administration (ART), after 5 weeks of ART+Peg-IFN-α2a dual treatment, and after 12 weeks of Peg-IFN-α2a monotherapy. Cell subset modulation, natural killer cell (NK) function and signaling, as well as inflammatory mediators and gene expression were assessed. Results were analyzed using R.2.5.1 or MATLAB 7.10.0. Five weeks of ART+Peg-IFN-α2a preserved the frequency of immune subsets and NK cytotoxicity, while increased the levels of inflammatory mediators, and decreased cell-responsiveness to in vitro IFN-α re-stimulation. Gene expression analysis showed that induction of host restriction factors after ART+Peg-IFN-α2a was not solely predictive of a virologic response, and revealed a 108 gene signature that identified subjects who did not modulate genes after ART+Peg-IFN-α2a. A 29 gene signature along with higher NK cell activation and IFN-γ-induced protein 10 (IP-10) levels on ART, as well as higher in vitro responses to IFN-γ-induced NK cytotoxicity, and decrease in the frequency of NK bearing inhibitory receptors [i.e. killer cell immunoglobulin-like receptor, two domains, long cytoplasmic tail 1 (KIR2DL1) or KIR2DL2/DL3] and C-C chemokine receptor type 7+ (CCR7) myeloid dendritic cells after ART+Peg-IFN-α2a distinguished responders from non-responders. Reductions in integrated HIV DNA after immunotherapy were associated with expression patterns of genes that are associated with activated cell-mediated response and NK cytotoxicity. In summary, innate activation and NK cell cytotoxicity are identified as correlates of HIV control and reduction after Peg-IFN-α2a immunotherapy in ART-suppressed subjects.
2019-06-03 | GSE107549 | GEO
Project description:Unlike HIV infection, which progresses to AIDS absent suppressive anti-retroviral therapy (ART), nonpathogenic infections in natural hosts, such African green monkeys (AGMs), are characterized by a lack of gut microbial translocation and robust secondary lymphoid Natural Killer (NK) cell responses resulting in absence of chronic inflammation and limited SIV dissemination in lymph nodes (LN) B-cell-follicles, respectively. In a pathogenic infection model (i.e. ART-treated, SIVmac239-infected rhesus macaques; RMs), sequential Interleukin (IL)-21 and interferon (IFN)-alpha therapy generated terminally-differentiated blood NK cells (NKG2a/clowCD16+) with potent HLA-E-restricted activity in response to SIV-ENV peptides in contrast to control RMs, where less differentiated, IFN-gamma+ NK cells predominated. The frequency and cytolytic activity of NKG2a/clowCD16+ NK cells correlated with a reduction of replication-competent SIV in LN during ART and viral rebound delay following analytical treatment interruption. These data demonstrate that AGM-like NK cell differentiation profiles can be rescued in RMs to promote viral clearance in tissues.
2021-02-22 | GSE163441 | GEO
Project description:Unlike HIV infection, which progresses to AIDS absent suppressive anti-retroviral therapy (ART), nonpathogenic infections in natural hosts, such African green monkeys (AGMs), are characterized by a lack of gut microbial translocation and robust secondary lymphoid Natural Killer (NK) cell responses resulting in absence of chronic inflammation and limited SIV dissemination in lymph nodes (LN) B-cell-follicles, respectively. In a pathogenic infection model (i.e. ART-treated, SIVmac239-infected rhesus macaques; RMs), sequential Interleukin (IL)-21 and interferon (IFN)-alpha therapy generated terminally-differentiated blood NK cells (NKG2a/clowCD16+) with potent HLA-E-restricted activity in response to SIV-ENV peptides in contrast to control RMs, where less differentiated, IFN-gamma+ NK cells predominated. The frequency and cytolytic activity of NKG2a/clowCD16+ NK cells correlated with a reduction of replication-competent SIV in LN during ART and viral rebound delay following analytical treatment interruption. These data demonstrate that AGM-like NK cell differentiation profiles can be rescued in RMs to promote viral clearance in tissues.
2021-02-22 | GSE163442 | GEO
Project description:Unlike HIV infection, which progresses to AIDS absent suppressive anti-retroviral therapy (ART), nonpathogenic infections in natural hosts, such African green monkeys (AGMs), are characterized by a lack of gut microbial translocation and robust secondary lymphoid Natural Killer (NK) cell responses resulting in absence of chronic inflammation and limited SIV dissemination in lymph nodes (LN) B-cell-follicles, respectively. In a pathogenic infection model (i.e. ART-treated, SIVmac239-infected rhesus macaques; RMs), sequential Interleukin (IL)-21 and interferon (IFN)-alpha therapy generated terminally-differentiated blood NK cells (NKG2a/clowCD16+) with potent HLA-E-restricted activity in response to SIV-ENV peptides in contrast to control RMs, where less differentiated, IFN-gamma+ NK cells predominated. The frequency and cytolytic activity of NKG2a/clowCD16+ NK cells correlated with a reduction of replication-competent SIV in LN during ART and viral rebound delay following analytical treatment interruption. These data demonstrate that AGM-like NK cell differentiation profiles can be rescued in RMs to promote viral clearance in tissues.
2021-02-22 | GSE163440 | GEO
Project description:CD8+ T-cells inhibit virus replication in SIV-infected rhesus macaques (RM). However, it is unclear to what extent the viral suppression mediated by CD8+ T-cells reflects direct killing of infected cells as opposed to indirect, non-cytolytic mechanisms. In this study, we used functional genomics to investigate potential mechanisms of in vivo viral suppression mediated by CD8+ lymphocytes. Eight chronically SIVmac239-infected RMs underwent CD8+ lymphocyte depletion, and RNA from whole blood was obtained prior to depletion, at the nadir of CD8+ lymphocytes (5 days post-depletion), and during the repopulation phase (11 days post-depletion). Principal components analysis demonstrated that overall gene expression during the nadir of CD8+ T-cells was highly divergent from other intervals. Conversely, the genomic signature of samples from the CD8+ cell rebound phase was similar to that of pre-depletion samples. During CD8+ lymphocyte depletion we detected a strongly significant decrease in the expression of the genes encoding CD8α and CD8β chains, consistent with the near complete CD8+ T-cell depletion measured by flow cytometry. Of note, we observed significant down-regulation of the expression of genes encoding for factors that can suppress SIV replication, including the CCR5-binding chemokine CCL5/Rantes, several retroviral restriction factors (TRIM10, TRIM15, APOBEC3G/H) and defensins. Reduced expression of various genes related to T cell activation and proliferation was also observed. Collectively, these data indicate that depletion of CD8+ lymphocytes in SIV-infected RMs is associated with the establishment of a pattern of gene expression that may result in increased intrinsic permissivity to virus replication. A total of 60 RNA samples were hybridized on to Rhesus Affymetrix 3' Expression arrays. The study was composed of 8 replicate rhesus macaques subjected to SIVmac239 infection and followed over infection, during subsequent treatment with monocloncal antibody OKT8F to deplete CD8+ T lymphocytes, antiretroviral therapy to suppress virus. Samples were taken at various time points during acute and chronic infection, after CD8+ cell depletion, after CD8+ cell reconstition, and during ART suppression of virus.
2013-02-08 | E-GEOD-37834 | biostudies-arrayexpress
Project description:HIV-1 persistence during ART is due to the establishment of long-lived viral reservoirs in resting immune cells. Using an NHP model of barcoded SIVmac239 intravenous infection and therapeutic dosing of the anti-TGFBR1 inhibitor galunisertib (LY2157299), we confirmed the latency reversal properties of in vivo TGF-beta blockade, decreased viral reservoirs and stimulated immune responses. Eight SIV-infected macaques on suppressive ART were treated with 4 2-week cycles of galunisertib. ART was discontinued 3 weeks after the last dose, and macaques euthanized 6 weeks after ART-interruption(ATI). One macaque did not rebound, while the remaining rebounded between week 2 and 6 post-ATI. Galunisertib led to viral reactivation as indicated by plasma viral load and immunoPET/CT with the 64Cu-DOTA-F(ab')2-p7D3-probe. Half to 1 Log decrease in cell-associated (CA-)SIV DNA was detected in lymph nodes, gut and PBMC, while intact pro-virus in PBMC decreased by 3-fold. No systemic increase in inflammatory cytokines was observed. High-dimensions cytometry, bulk and single-cell RNAseq revealed a shift toward an effector phenotype in T and NK cells.
2024-01-08 | GSE244870 | GEO
Project description:HIV-1 persistence during ART is due to the establishment of long-lived viral reservoirs in resting immune cells. Using an NHP model of barcoded SIVmac239 intravenous infection and therapeutic dosing of the anti-TGFBR1 inhibitor galunisertib (LY2157299), we confirmed the latency reversal properties of in vivo TGF-beta blockade, decreased viral reservoirs and stimulated immune responses. Eight SIV-infected macaques on suppressive ART were treated with 4 2-week cycles of galunisertib. ART was discontinued 3 weeks after the last dose, and macaques euthanized 6 weeks after ART-interruption(ATI). One macaque did not rebound, while the remaining rebounded between week 2 and 6 post-ATI. Galunisertib led to viral reactivation as indicated by plasma viral load and immunoPET/CT with the 64Cu-DOTA-F(ab')2-p7D3-probe. Half to 1 Log decrease in cell-associated (CA-)SIV DNA was detected in lymph nodes, gut and PBMC, while intact pro-virus in PBMC decreased by 3-fold. No systemic increase in inflammatory cytokines was observed. High-dimensions cytometry, bulk and single-cell RNAseq revealed a shift toward an effector phenotype in T and NK cells.
2024-01-08 | GSE244828 | GEO
Project description:Short-term pIFN-α2a treatment does not significantly reduce the viral reservoir of SIV-infected, ART-treated rhesus macaques
| PRJNA471741 | ENA
Project description:Sustainable HIV remission after antiretroviral therapy (ART) withdrawal, or post-treatment control (PTC), remains a top priority in the HIV field. We observed surprising PTC in an MHC-haplomatched cohort of SIVmac239+ Mauritian cynomolgus macaques (MCMs) initiated on ART at two weeks post-infection (wpi). For six months after ART withdrawal, we observed undetectable or transient viremia in seven of eight MCMs. In vivo CD8α depletion induced rebound in all animals, indicating the PTC was mediated by CD8α+ cells. We found that MCMs had a smaller acute viral reservoir than a cohort of identically infected rhesus macaques, a population that rarely develops PTC. The mechanisms by which unusually small viral reservoirs and CD8α+ cell-mediated virus suppression enable PTC can be investigated using this model of PTC in MHC-haplomatched MCMs. If the immunological mechanisms that can engender PTC are defined, this model could designate therapeutic targets for HIV remission strategies in humans.
2023-08-07 | GSE225770 | GEO
Project description:Pathogenic HIV/SIV infection of humans and rhesus macaques (RMs) induces persistently high production of type-I interferon (IFN-I) which is thought to contribute to disease progression. To elucidate the specific role of IFN in SIV pathogenesis, 12 RMs were treated prior to i.v. SIVmac239 infection with a high or a low dose of an antibody (AGS-009) that neutralizes most IFN subtypes, and compared with six mock-infused, SIV-infected controls. Plasma viremia was measured post infection to assess the effect of IFNα blockade on virus replication, and peripheral blood and lymphoid tissue samples were analyzed by immunophenotypical staining. Consistent with the known antiviral effect of IFN-I, high-dose AGS-009 treatment induced a modest increase in acute phase viral loads vs. controls. 4 out of 6 RMs receiving a high dose of AGS-009 also experienced an early decline in CD4+ T cell counts which was associated with progression to AIDS. Interestingly, 50% of animals treated with AGS-009 (6/12) developed AIDS within one year of infection, compared with 17% (1/6) of untreated controls. Finally, blockade of IFN decreased the levels of activated CD4+ and CD8+ T cells, as well as B-cells, as measured by PD-1 and/or Ki67 expression. The lower levels of activated lymphocytes in IFN-blockade animals supports the hypothesis that IFN signaling contributes to lymphocyte activation during SIV infection, and suggests that this signaling pathway is involved in controlling virus replication during acute infection. The potential anti-inflammatory effect of IFN blockade should be explored as a strategy to reduce immune activation in HIV-infected individuals.
2018-02-19 | GSE110617 | GEO