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Innate signaling networks in B cell antibody production new targets for vaccine...

Innate signaling networks in B cell antibody production new targets for vaccine development The long-term goal of this proposal is to explore a novel immune pathway that involves an unexpected interplay between marginal zone (MZ) B cells and neutrophils. MZ B cells are strategically positioned at the interface between th... ver más

30/09/2018

Fundació Institut...

2M€

Presupuesto del proyecto: 2M€

Líder del proyecto

Fundació Institut Hospital del Mar D'Investig... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5 | 16M€

Fecha límite participación Sin fecha límite de participación.

Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2018-09-30 No tenemos la información de la convocatoria

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1 Participantes

Fundació Institut Hospital d...

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Líder del proyecto

Fundació Institut Hospital del Mar D'Investig... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5 | 16M€

Presupuesto del proyecto 2M€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto The long-term goal of this proposal is to explore a novel immune pathway that involves an unexpected interplay between marginal zone (MZ) B cells and neutrophils. MZ B cells are strategically positioned at the interface between the immune system and the circulation and rapidly produce protective antibodies to blood-borne pathogens through a T cell-independent pathway that remains poorly understood. We recently found that the human spleen contains a novel subset of B cell helper neutrophils (NBH cells) with a phenotype and gene expression profile distinct from those of conventional circulating neutrophils (NC cells). In this proposal, we hypothesize that NC cells undergo splenic reprogramming into NBH cells through an IL-10-dependent pathway involving perifollicular sinusoidal endothelial cells. We contend that these unique endothelial cells release NC cell-attracting chemokines and IL-10 upon sensing blood-borne bacteria through Toll-like receptors. We also argue that IL-10 from sinusoidal endothelial cells stimulates NC cells to differentiate into NBH cells equipped with powerful MZ B cell-stimulating activity. The following three aims will be pursued. Aim 1 is to determine the mechanisms by which splenic sinusoidal endothelial cells induce reprogramming of NC cells into NBH cells upon sensing bacteria through Toll-like receptors. Aim 2 is to elucidate the mechanisms by which NBH cells induce IgM production, IgG and IgA class switching, and plasma cell differentiation in MZ B cells. Aim 3 is to evaluate the mechanisms by which NBH cells induce V(D)J gene somatic hypermutation and high-affinity antibody production in MZ B cells. These studies will uncover previously unknown facets of the immunological function of neutrophils by taking advantage of unique cells and tissues from patients with rare primary immunodeficiencies and by making use of selected mouse models. Results from these studies may also lead to the identification of novel vaccine strategies.

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