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ABSTRACT: Gut bacteriome of the Madagascar hissing cockroach Gromphadorhina portentosa

PROVIDER: PRJNA835815 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR19147663_1.fastq.gz	Fastqsanger.gz
	SRR19147663_2.fastq.gz	Fastqsanger.gz
	SRR19147664_1.fastq.gz	Fastqsanger.gz
	SRR19147664_2.fastq.gz	Fastqsanger.gz
	SRR19147665_1.fastq.gz	Fastqsanger.gz

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Project description:The aim of the project is to obtain information about the repertoire of proteins synthesized by differentiating hemocytes of the Madagascar cockroach Gromphadorhina portentosa in order to gain insight into the types of defense reactions carried out by these cells.

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Project description:Background: Cockroach allergy contributes to morbidity among urban children with asthma. Few trials address the effect of subcutaneous immunotherapy (SCIT) with cockroach allergen among these at-risk children.Objective: To determine if nasal allergen challenge (NAC) responses to cockroach allergen would improve following one year of SCIT.Methods: Urban children with asthma, cockroach-sensitized (skin prick test [SPT] and serum specific IgE) and reactive on NAC, participated in a yearlong randomized double-blind placebo-controlled SCIT trial using German cockroach extract. The primary endpoint was the change in mean total nasal symptoms scores (TNSS) during NAC after 12 months of SCIT. Changes in nasal transcriptomic responses during NAC, SPT wheal size, serum allergen-specific antibody production and T-cell responses to cockroach allergen were assessed.Results: Changes in mean NAC TNSS did not differ between SCIT-assigned (n=28) versus placebo-assigned (n=29) participants (p=0.63). Nasal transcriptomic responses correlated with TNSS, but a treatment effect was not observed. Cockroach sIgE decreased to a similar extent in both groups, while decreased cockroach SPT wheal size was greater among SCIT participants (p=0.04). A 200-fold increase in cockroach sIgG4 was observed among subjects receiving SCIT (p<0.001) but was unchanged in the placebo group. T-cell interleukin-4 responses following cockroach allergen stimulation decreased to a greater extent among SCIT versus placebo (p=0.002), while no effect was observed for interleukin-10 or interferon-gamma.Conclusion: A year of SCIT failed to alter NAC TNSS and nasal transcriptome responses to cockroach allergen challenge despite systemic effects on allergen-specific skin tests, induction of serum sIgG4 production and down-modulation of allergen stimulated T-cell responses.

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