Cargando…
The FcεRI signaling cascade and integrin trafficking converge at patterned ligand surfaces
We examined the spatial targeting of early and downstream signaling mediated by the immunoglobulin E (IgE) receptor (FcεRI) in RBL mast cells using surface-patterned 2,4-dinitrophenyl (DNP) ligands. Micron-sized features of DNP are presented as densely immobilized conjugates of bovine serum albumin...
Autores principales: | , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The American Society for Cell Biology
2017
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5687038/ https://www.ncbi.nlm.nih.gov/pubmed/28794269 http://dx.doi.org/10.1091/mbc.E17-03-0208 |
_version_ | 1783278896350756864 |
---|---|
author | Wakefield, Devin L. Holowka, David Baird, Barbara |
author_facet | Wakefield, Devin L. Holowka, David Baird, Barbara |
author_sort | Wakefield, Devin L. |
collection | PubMed |
description | We examined the spatial targeting of early and downstream signaling mediated by the immunoglobulin E (IgE) receptor (FcεRI) in RBL mast cells using surface-patterned 2,4-dinitrophenyl (DNP) ligands. Micron-sized features of DNP are presented as densely immobilized conjugates of bovine serum albumin (DNP-BSA) or mobile in a supported lipid bilayer (DNP-SLB). Although soluble anti-DNP IgE binds uniformly across features for both pattern types, IgE bound to FcεRI on cells shows distinctive distributions: uniform for DNP-SLB and edge concentrated for DNP-BSA. These distributions of IgE-FcεRI propagate to the spatial recruitment of early signaling proteins, including spleen tyrosine kinase (Syk), linker for activation of T-cells (LAT), and activated phospholipase C gamma 1 (PLCγ1), which all localize with engaged receptors. We found stimulated polymerization of F-actin is not required for Syk recruitment but is progressively involved in the recruitment of LAT and PLCγ1. We further found β1- and β3-integrins colocalize with IgE-FcεRI at patterned ligand surfaces as cells spread. This recruitment corresponds to directed exocytosis of recycling endosomes (REs) containing these integrins and their fibronectin ligand. Together our results show targeting of signaling components, including integrins, to regions of clustered IgE-FcεRI in processes that depend on stimulated actin polymerization and outward trafficking of REs. |
format | Online Article Text |
id | pubmed-5687038 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | The American Society for Cell Biology |
record_format | MEDLINE/PubMed |
spelling | pubmed-56870382018-01-22 The FcεRI signaling cascade and integrin trafficking converge at patterned ligand surfaces Wakefield, Devin L. Holowka, David Baird, Barbara Mol Biol Cell Articles We examined the spatial targeting of early and downstream signaling mediated by the immunoglobulin E (IgE) receptor (FcεRI) in RBL mast cells using surface-patterned 2,4-dinitrophenyl (DNP) ligands. Micron-sized features of DNP are presented as densely immobilized conjugates of bovine serum albumin (DNP-BSA) or mobile in a supported lipid bilayer (DNP-SLB). Although soluble anti-DNP IgE binds uniformly across features for both pattern types, IgE bound to FcεRI on cells shows distinctive distributions: uniform for DNP-SLB and edge concentrated for DNP-BSA. These distributions of IgE-FcεRI propagate to the spatial recruitment of early signaling proteins, including spleen tyrosine kinase (Syk), linker for activation of T-cells (LAT), and activated phospholipase C gamma 1 (PLCγ1), which all localize with engaged receptors. We found stimulated polymerization of F-actin is not required for Syk recruitment but is progressively involved in the recruitment of LAT and PLCγ1. We further found β1- and β3-integrins colocalize with IgE-FcεRI at patterned ligand surfaces as cells spread. This recruitment corresponds to directed exocytosis of recycling endosomes (REs) containing these integrins and their fibronectin ligand. Together our results show targeting of signaling components, including integrins, to regions of clustered IgE-FcεRI in processes that depend on stimulated actin polymerization and outward trafficking of REs. The American Society for Cell Biology 2017-11-07 /pmc/articles/PMC5687038/ /pubmed/28794269 http://dx.doi.org/10.1091/mbc.E17-03-0208 Text en © 2017 Wakefield et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). “ASCB®,” “The American Society for Cell Biology®,” and “Molecular Biology of the Cell®” are registered trademarks of The American Society for Cell Biology. |
spellingShingle | Articles Wakefield, Devin L. Holowka, David Baird, Barbara The FcεRI signaling cascade and integrin trafficking converge at patterned ligand surfaces |
title | The FcεRI signaling cascade and integrin trafficking converge at patterned ligand surfaces |
title_full | The FcεRI signaling cascade and integrin trafficking converge at patterned ligand surfaces |
title_fullStr | The FcεRI signaling cascade and integrin trafficking converge at patterned ligand surfaces |
title_full_unstemmed | The FcεRI signaling cascade and integrin trafficking converge at patterned ligand surfaces |
title_short | The FcεRI signaling cascade and integrin trafficking converge at patterned ligand surfaces |
title_sort | fcεri signaling cascade and integrin trafficking converge at patterned ligand surfaces |
topic | Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5687038/ https://www.ncbi.nlm.nih.gov/pubmed/28794269 http://dx.doi.org/10.1091/mbc.E17-03-0208 |
work_keys_str_mv | AT wakefielddevinl thefcerisignalingcascadeandintegrintraffickingconvergeatpatternedligandsurfaces AT holowkadavid thefcerisignalingcascadeandintegrintraffickingconvergeatpatternedligandsurfaces AT bairdbarbara thefcerisignalingcascadeandintegrintraffickingconvergeatpatternedligandsurfaces AT wakefielddevinl fcerisignalingcascadeandintegrintraffickingconvergeatpatternedligandsurfaces AT holowkadavid fcerisignalingcascadeandintegrintraffickingconvergeatpatternedligandsurfaces AT bairdbarbara fcerisignalingcascadeandintegrintraffickingconvergeatpatternedligandsurfaces |