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| Indexado |
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| DOI | 10.3390/CELLS11233883 | ||||
| Año | 2022 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
The engagement of B cells with surface-tethered antigens triggers the formation of an immune synapse (IS), where the local secretion of lysosomes can facilitate antigen uptake. Lysosomes intersect with other intracellular processes, such as Toll-like Receptor (TLR) signaling and autophagy coordinating immune responses. However, the crosstalk between these processes and antigen presentation remains unclear. Here, we show that TLR stimulation induces autophagy in B cells and decreases their capacity to extract and present immobilized antigens. We reveal that TLR stimulation restricts lysosome repositioning to the IS by triggering autophagy-dependent degradation of GEF-H1, a Rho GTP exchange factor required for stable lysosome recruitment at the synaptic membrane. GEF-H1 degradation is not observed in B cells that lack αV integrins and are deficient in TLR-induced autophagy. Accordingly, these cells show efficient antigen extraction in the presence of TLR stimulation, confirming the role of TLR-induced autophagy in limiting antigen extraction. Overall, our results suggest that resources associated with autophagy regulate TLR and BCR-dependent functions, which can finetune antigen uptake by B cells. This work helps to understand the mechanisms by which B cells are activated by surface-tethered antigens in contexts of subjacent inflammation before antigen recognition, such as sepsis.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Lagos, Jonathan | Hombre |
Pontificia Universidad Católica de Chile - Chile
Children's Hospital and Regional Medical Center - Estados Unidos Seattle Childrens Res Inst - Estados Unidos |
| 2 | Sagadiev, Sara | - |
Children's Hospital and Regional Medical Center - Estados Unidos
Seattle Childrens Res Inst - Estados Unidos |
| 3 | Diaz, J. | - |
Pontificia Universidad Católica de Chile - Chile
|
| 4 | BOZO-PARRAGUEZ, JORGE | Hombre |
Pontificia Universidad Católica de Chile - Chile
|
| 5 | GUZMAN-QUIMBAYO, FANNY | Mujer |
Pontificia Universidad Católica de Valparaíso - Chile
|
| 6 | Stefani, Caroline | - |
Benaroya Research Institute at Virginia Mason - Estados Unidos
Benaroya Res Inst Virginia Mason - Estados Unidos |
| 7 | ZANLUNGO-MATSUHIRO, SILVANA | Mujer |
Pontificia Universidad Católica de Chile - Chile
|
| 8 | Acharya, Mridu | - |
Children's Hospital and Regional Medical Center - Estados Unidos
University of Washington - Estados Unidos Seattle Childrens Res Inst - Estados Unidos UNIV WASHINGTON - Estados Unidos University of Washington School of Medicine - Estados Unidos |
| 9 | Yuseff, Maria-Isabel | Mujer |
Pontificia Universidad Católica de Chile - Chile
|
| Fuente |
|---|
| NIH |
| National Institutes of Health |
| National Institute of Allergy and Infectious Diseases |
| Proyecto FONDECYT |
| DOCTORADO |
| Agencia Nacional de Investigación y Desarrollo |
| ANID/Doctorado Nacional Chile |
| Agradecimiento |
|---|
| This research was funded by NIH grant number R01AI151167 (M.A.), Proyecto Fondecyt 1180900 (M.I.Y.) and J.L. was supported by ANID/Doctorado Nacional Chile/2016-21161495. |
| This research was funded by NIH grant number R01AI151167 (M.A.), Proyecto Fondecyt 1180900 (M.I.Y.) and J.L. was supported by ANID/Doctorado Nacional Chile/2016-21161495. |