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Transcription Profiling of Malaria-Naïve and Semi-Immune Colombian Volunteers in a Plasmodium vivax Sporozoite Challenge [RT-PCR]

ABSTRACT: Whole blood gene expression was monitored in 85 samples using a Fluidigm nanoscale RT-qPCR array targeting 96 genes that we refer to as “blood informative transcripts” (BIT). There was no evidence for transcriptional changes prior to the appearance of blood stage parasite at day 12 or 13, at which time there was a strong interferon response and, unexpectedly, down-regulation of transcripts related to inflammation and innate immunity. This samples are related with the samples with accession number GSE67184

ORGANISM(S): Homo sapiens

PROVIDER: GSE67469 | GEO | 2015/07/14

SECONDARY ACCESSION(S): PRJNA280001

REPOSITORIES: GEO

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Transcription Profiling of Malaria-Naïve and Semi-Immune Colombian Volunteers in a Plasmodium vivax Sporozoite Challenge [RT-PCR]

Project description:Whole blood gene expression was monitored in 85 samples using a Fluidigm nanoscale RT-qPCR array targeting 96 genes that we refer to as “blood informative transcripts” (BIT). There was no evidence for transcriptional changes prior to the appearance of blood stage parasite at day 12 or 13, at which time there was a strong interferon response and, unexpectedly, down-regulation of transcripts related to inflammation and innate immunity. This samples are related with the samples with accession number GSE67184 Reverse Transcription followed by quantitative PCR (RT-qPCR) was performed using Fluidigm 96×96 nanofluidic arrays targeting a set of 96 transcripts that are broadly informative of the major axes of variation for peripheral blood gene expression from Preininger et al. (2013) at six time-points (Pre-challenge, day 5, day 7, day 9, Diagnosis (Dx) and month 4).

2015-07-14 | E-GEOD-67469 | biostudies-arrayexpress

Plasmodium vivax sporozoite challenge in malaria-naive and semi-immune Colombian volunteers.

Project description:BackgroundSignificant progress has been recently achieved in the development of Plasmodium vivax challenge infections in humans, which are essential for vaccine and drug testing. With the goal of accelerating clinical development of malaria vaccines, the outcome of infections experimentally induced in naïve and semi-immune volunteers by infected mosquito bites was compared.MethodsSeven malaria-naïve and nine semi-immune Colombian adults (n = 16) were subjected to the bites of 2-4 P. vivax sporozoite-infected Anopheles mosquitoes. Parasitemia levels, malaria clinical manifestations, and immune responses were assessed and compared.ResultsAll volunteers developed infections as confirmed by microscopy and RT-qPCR. No significant difference in the pre-patent period (mean 12.5 and 12.8 days for malaria-naïve and malaria-exposed, respectively) was observed but naïve volunteers developed classical malaria signs and symptoms, while semi-immune volunteers displayed minor or no symptoms at the day of diagnosis. A malaria-naïve volunteer developed a transient low submicroscopic parasitemia that cured spontaneously. Infection induced an increase in specific antibody levels in both groups.ConclusionSporozoite infectious challenge was safe and reproducible in semi-immune and naïve volunteers. This model will provide information for simultaneous comparison of the protective efficacy of P. vivax vaccines in naïve and semi-immune volunteers under controlled conditions and would accelerate P. vivax vaccine development.Trial registrationclinicaltrials.gov NCT01585077.

| S-EPMC4070897 | biostudies-literature

Transcription Profiling of Malaria-Naïve and Semi-Immune Colombian Volunteers in a Plasmodium vivax Sporozoite Challenge [RNA-Seq]

Project description:We report two clusters in the overall profiles of expression among the samples. At the parasitemia onset, there is a strong interferon response reflected in up-regulation of co-regulated transcripts, while unexpectedly we also see down-regulation of transcripts related to TLR signaling and innate immunity. RNASeq also suggested differential expression of reticulocytes and a subset of T cell function. No obvious difference in the transcriptomes of naïve and semi-immune volunteers was seen, however several hundred genes were up-regulated in naïve individuals.

2015-07-14 | GSE67184 | GEO

Transcription Profiling of Malaria-Naïve and Semi-Immune Colombian Volunteers in a Plasmodium vivax Sporozoite Challenge

Project description:This SuperSeries is composed of the SubSeries listed below.

2015-07-14 | GSE67470 | GEO

Transcription Profiling of Malaria-Naïve and Semi-Immune Colombian Volunteers in a Plasmodium vivax Sporozoite Challenge [RNA-Seq]

2015-07-14 | E-GEOD-67184 | biostudies-arrayexpress

Transcription Profiling of Malaria-Naive and Semi-immune Colombian Volunteers in a Plasmodium vivax Sporozoite Challenge.

Project description:BACKGROUND:Continued exposure to malaria-causing parasites in endemic regions of malaria induces significant levels of acquired immunity in adult individuals. A better understanding of the transcriptional basis for this acquired immunological response may provide insight into how the immune system can be boosted during vaccination, and into why infected individuals differ in symptomology. METHODOLOGY/PRINCIPAL FINDINGS:Peripheral blood gene expression profiles of 9 semi-immune volunteers from a Plasmodium vivax malaria prevalent region (Buenaventura, Colombia) were compared to those of 7 naïve individuals from a region with no reported transmission of malaria (Cali, Colombia) after a controlled infection mosquito bite challenge with P. vivax. A Fluidigm nanoscale quantitative RT-PCR array was used to survey altered expression of 96 blood informative transcripts at 7 timepoints after controlled infection, and RNASeq was used to contrast pre-infection and early parasitemia timepoints. There was no evidence for transcriptional changes prior to the appearance of blood stage parasites at day 12 or 13, at which time there was a strong interferon response and, unexpectedly, down-regulation of transcripts related to inflammation and innate immunity. This differential expression was confirmed with RNASeq, which also suggested perturbations of aspects of T cell function and erythropoiesis. Despite differences in clinical symptoms between the semi-immune and malaria naïve individuals, only subtle differences in their transcriptomes were observed, although 175 genes showed significantly greater induction or repression in the naïve volunteers from Cali. CONCLUSION/SIGNIFICANCE:Gene expression profiling of whole blood reveals the type and duration of the immune response to P. vivax infection, and highlights a subset of genes that may mediate adaptive immunity.

| S-EPMC4526565 | biostudies-literature

Transcription Profiling of Malaria-Naïve and Semi-Immune Colombian Volunteers in a Plasmodium vivax Sporozoite Challenge

Project description:Transcription Profiling of Malaria-Naïve and Semi-Immune Colombian Volunteers in a Plasmodium vivax Sporozoite Challenge

| PRJNA280000 | ENA

Profiling gene expression of the host response to an irradiated sporozoite immunization and Plasmodium vivax malaria challenge

Project description:We report an initial understanding of the modular immune response to a P. vivax malaria challenge after protection with PvRAS. By contrasting blood samples drawn at baseline, following immunization but pre-challenge, and at the first day of diagnosis of malaria in affected subjects.

2017-12-31 | GSE85263 | GEO

Protective Efficacy of Plasmodium vivax Radiation-Attenuated Sporozoites in Colombian Volunteers: A Randomized Controlled Trial.

Project description:BackgroundImmunizing human volunteers by mosquito bite with radiation-attenuated Plasmodium falciparum sporozoites (RAS) results in high-level protection against infection. Only two volunteers have been similarly immunized with P. vivax (Pv) RAS, and both were protected. A phase 2 controlled clinical trial was conducted to assess the safety and protective efficacy of PvRAS immunization.Methodology/principal findingsA randomized, single-blinded trial was conducted. Duffy positive (Fy+; Pv susceptible) individuals were enrolled: 14 received bites from irradiated (150 ± 10 cGy) Pv-infected Anopheles mosquitoes (RAS) and 7 from non-irradiated non-infected mosquitoes (Ctl). An additional group of seven Fy- (Pv refractory) volunteers was immunized with bites from non-irradiated Pv-infected mosquitoes. A total of seven immunizations were carried out at mean intervals of nine weeks. Eight weeks after last immunization, a controlled human malaria infection (CHMI) with non-irradiated Pv-infected mosquitoes was performed. Nineteen volunteers completed seven immunizations (12 RAS, 2 Ctl, and 5 Fy-) and received a CHMI. Five of 12 (42%) RAS volunteers were protected (receiving a median of 434 infective bites) compared with 0/2 Ctl. None of the Fy- volunteers developed infection by the seventh immunization or after CHMI. All non-protected volunteers developed symptoms 8-13 days after CHMI with a mean pre-patent period of 12.8 days. No serious adverse events related to the immunizations were observed. Specific IgG1 anti-PvCS response was associated with protection.ConclusionImmunization with PvRAS was safe, immunogenic, and induced sterile immunity in 42% of the Fy+ volunteers. Moreover, Fy- volunteers were refractory to Pv malaria.Trial registrationIdentifier: NCT01082341.

| S-EPMC5070852 | biostudies-literature

Unraveling the Plasmodium vivax sporozoite transcriptional journey from mosquito vector to human host

Project description:Malaria parasites transmitted by mosquito bite are remarkably efficient in establishing human infections. The infection process requires ~30 minutes and is highly complex as quiescent sporozoites injected with mosquito saliva must be rapidly activated in the skin, migrate through the body, and infect the liver. This process is poorly understood for Plasmodium vivax due to low infectivity in the in vitro models. To study this skin-to-liver stage of malaria, we developed quantitative bioassays coupled with transcriptomics to evaluate parasite changes linked with mammalian microenvironmental factors. Our in vitro phenotype and RNA-seq analyses revealedkey microenvironmental relationships with distinct biological functions. M ost notable, preservation of sporozoite quiescence by exposure to insect-like factors coupled with strategic activation limits untimely activation of invasion-associated genes to dramatically increase hepatocyte invasion rates. We also report the first transcriptomic analysis of the P. vivax sporozoite interaction in salivary glands identifying 118 infection-related differentially-regulated Anopheles dirus genes. These results provide important new insights in malaria parasite biology and identify priority targets for antimalarial therapeutic interventions to block P. vivax infection.

2018-08-16 | GSE117538 | GEO

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