actin-based motor protein myosin II regulates MHC class II trafficking and BCR-driven antigen presentation

Antigen (Ag) capture and presentation onto major histocompatibility complex (MHC) class II molecules by B lymphocytes is mediated by their surface Ag receptor (B cell receptor [BCR]). Therefore, the transport of vesicles that carry MHC class II and BCR-Ag complexes must be coordinated for them to co...

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Veröffentlicht in:The Journal of cell biology 2007-03, Vol.176 (7), p.1007-1019
Hauptverfasser: Vascotto, Fulvia, Lankar, Danielle, Faure-André, Gabrielle, Vargas, Pablo, Diaz, Jheimmy, Le Roux, Delphine, Yuseff, Maria-Isabel, Sibarita, Jean-Baptiste, Boes, Marianne, Raposo, Graça, Mougneau, Evelyne, Glaichenhaus, Nicolas, Bonnerot, Christian, Manoury, Bénédicte, Lennon-Duménil, Ana-Maria
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container_end_page 1019
container_issue 7
container_start_page 1007
container_title The Journal of cell biology
container_volume 176
creator Vascotto, Fulvia
Lankar, Danielle
Faure-André, Gabrielle
Vargas, Pablo
Diaz, Jheimmy
Le Roux, Delphine
Yuseff, Maria-Isabel
Sibarita, Jean-Baptiste
Boes, Marianne
Raposo, Graça
Mougneau, Evelyne
Glaichenhaus, Nicolas
Bonnerot, Christian
Manoury, Bénédicte
Lennon-Duménil, Ana-Maria
description Antigen (Ag) capture and presentation onto major histocompatibility complex (MHC) class II molecules by B lymphocytes is mediated by their surface Ag receptor (B cell receptor [BCR]). Therefore, the transport of vesicles that carry MHC class II and BCR-Ag complexes must be coordinated for them to converge for processing. In this study, we identify the actin-associated motor protein myosin II as being essential for this process. Myosin II is activated upon BCR engagement and associates with MHC class II-invariant chain complexes. Myosin II inhibition or depletion compromises the convergence and concentration of MHC class II and BCR-Ag complexes into lysosomes devoted to Ag processing. Accordingly, the formation of MHC class II-peptides and subsequent CD4 T cell activation are impaired in cells lacking myosin II activity. Therefore, myosin II emerges as a key motor protein in BCR-driven Ag processing and presentation.
doi_str_mv 10.1083/jcb.200611147
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Therefore, the transport of vesicles that carry MHC class II and BCR-Ag complexes must be coordinated for them to converge for processing. In this study, we identify the actin-associated motor protein myosin II as being essential for this process. Myosin II is activated upon BCR engagement and associates with MHC class II-invariant chain complexes. Myosin II inhibition or depletion compromises the convergence and concentration of MHC class II and BCR-Ag complexes into lysosomes devoted to Ag processing. Accordingly, the formation of MHC class II-peptides and subsequent CD4 T cell activation are impaired in cells lacking myosin II activity. 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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects Actins
Actins - metabolism
Amino acids
Animals
Antigen Presentation
Antigen Presentation - immunology
Antigens
B lymphocytes
B-Lymphocytes - immunology
B-Lymphocytes - metabolism
CD4-Positive T-Lymphocytes
CD4-Positive T-Lymphocytes - immunology
Cell membranes
Cells, Cultured
Histocompatibility Antigens Class II
Histocompatibility Antigens Class II - immunology
Histocompatibility Antigens Class II - metabolism
Immunology
Life Sciences
Lymphocyte Activation
Lymphocyte Activation - immunology
Lymphocytes
Lysosomes
Lysosomes - immunology
Lysosomes - metabolism
Macromolecular Substances
Macromolecular Substances - immunology
Macromolecular Substances - metabolism
Mice
Mice, Transgenic
Mixed lymphocyte culture test
Molecules
Myosin Type II
Myosin Type II - immunology
Myosin Type II - metabolism
Physiological regulation
Polymers
Protein Transport
Protein Transport - immunology
Proteins
Receptors, Antigen, B-Cell
Receptors, Antigen, B-Cell - immunology
Receptors, Antigen, B-Cell - metabolism
Small interfering RNA
Spleen
Studies
T cell receptors
T lymphocytes
Transport Vesicles
Transport Vesicles - immunology
Transport Vesicles - metabolism
title actin-based motor protein myosin II regulates MHC class II trafficking and BCR-driven antigen presentation
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