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CARD9-associated Dectin-1 and Dectin-2 are Required for Protective Immunity of a Multivalent Vaccine Against Coccidioides posadasii Infection

ABSTRACT: CARD9-associated Dectin-1 and Dectin-2 are Required for Protective Immunity of a Multivalent Vaccine Against Coccidioides posadasii Infection

PROVIDER: PRJNA550079 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR9336530.fastq.gz	Fastqsanger.gz
	SRR9336531.fastq.gz	Fastqsanger.gz
	SRR9336532.fastq.gz	Fastqsanger.gz
	SRR9336527.fastq.gz	Fastqsanger.gz
	SRR9336528.fastq.gz	Fastqsanger.gz

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Genome-wide analysis of the CARD9/Dectin-1 transcriptional program in neutrophils and macrophages by RNA-seq

Project description:Purpose: To characterize Card9-dependent and Card9-independent Dectin-1 mediated gene expression changes in neutrophils and to compare response to Dectin-1 stimulation in neutrophils and macrophages. Method: BM neutrophils from WT and Card9-/- mice were isolated by MACS column purification and treated with or without the Dectin-1 agonist, curdlan for 3 hrs. WT BM-derived macrophages were also treated with or without curdlan for 3hrs before sample collection. Results: We identified both Card9-dependent and Card9-independent gene expression changes with Dectin-1 stimulation in neutrophils. We also identified cell-type specific differences in the response to Dectin-1 stimulation in neutrophils and macrophages. Conclusions: Dectin-1 stimulation induces significant gene expression changes regulated by either canonical Card9-dependent or non-canonical Card9-independent mechanisms.

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CARD9-Associated Dectin-1 and Dectin-2 Are Required for Protective Immunity of a Multivalent Vaccine against <i>Coccidioides posadasii</i> Infection.

Project description:Coccidioides species are fungal pathogens that can cause a widely varied clinical manifestation from mild pulmonary symptom to disseminated, life-threatening disease. We have previously created a subunit vaccine by encapsulating a recombinant coccidioidal Ag (rCpa1) in glucan-chitin particles (GCPs) as an adjuvant-delivery system. The GCP-rCpa1 vaccine has shown to elicit a mixed Th1 and Th17 response and confers protection against pulmonary coccidioidomycosis in mice. In this study, we further delineated the vaccine-induced protective mechanisms. Depletion of IL-17A in vaccinated C57BL/6 mice prior to challenge abrogated the protective efficacy of GCP-rCpa1 vaccine. Global transcriptome and Ingenuity Pathway Analysis of murine bone marrow-derived macrophages after exposure to this vaccine revealed the upregulation of proinflammatory cytokines (TNF-α, IL-6, and IL-1β) that are associated with activation of C-type lectin receptors (CLR) Dectin-1- and Dectin-2-mediated CARD9 signaling pathway. The GCP formulation of rCpa1 bound soluble Dectin-1 and Dectin-2 and triggered ITAM signaling of corresponding CLR reporter cells. Furthermore, macrophages that were isolated from Dectin-1 -/-, Dectin-2 -/-, and CARD9 -/- mice significantly reduced production of inflammatory cytokines in response to the GCP-rCpa1 vaccine compared with those of wild-type mice. The GCP-rCpa1 vaccine had significantly reduced protective efficacy in Dectin-1 -/-, Dectin-2 -/-, and CARD9 -/- mice that showed decreased acquisition of Th cells in Coccidioides-infected lungs compared with vaccinated wild-type mice, especially Th17 cells. Collectively, we conclude that the GCP-rCpa1 vaccine stimulates a robust Th17 immunity against Coccidioides infection through activation of the CARD9-associated Dectin-1 and Dectin-2 signal pathways.

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