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2016 ; 99
(5
): 699-710
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WASp-dependent actin cytoskeleton stability at the dendritic cell immunological
synapse is required for extensive, functional T cell contacts
#MMPMID26590149
Malinova D
; Fritzsche M
; Nowosad CR
; Armer H
; Munro PM
; Blundell MP
; Charras G
; Tolar P
; Bouma G
; Thrasher AJ
J Leukoc Biol
2016[May]; 99
(5
): 699-710
PMID26590149
show ga
The immunological synapse is a highly structured and molecularly dynamic
interface between communicating immune cells. Although the immunological synapse
promotes T cell activation by dendritic cells, the specific organization of the
immunological synapse on the dendritic cell side in response to T cell engagement
is largely unknown. In this study, confocal and electron microscopy techniques
were used to investigate the role of dendritic cell actin regulation in
immunological synapse formation, stabilization, and function. In the dendritic
cell-restricted absence of the Wiskott-Aldrich syndrome protein, an important
regulator of the actin cytoskeleton in hematopoietic cells, the immunological
synapse contact with T cells occupied a significantly reduced surface area. At a
molecular level, the actin network localized to the immunological synapse
exhibited reduced stability, in particular, of the actin-related
protein-2/3-dependent, short-filament network. This was associated with decreased
polarization of dendritic cell-associated ICAM-1 and MHC class II, which was
partially dependent on Wiskott-Aldrich syndrome protein phosphorylation. With the
use of supported planar lipid bilayers incorporating anti-ICAM-1 and anti-MHC
class II antibodies, the dendritic cell actin cytoskeleton organized into
recognizable synaptic structures but interestingly, formed Wiskott-Aldrich
syndrome protein-dependent podosomes within this area. These findings demonstrate
that intrinsic dendritic cell cytoskeletal remodeling is a key regulatory
component of normal immunological synapse formation, likely through consolidation
of adhesive interaction and modulation of immunological synapse stability.
|Actin Cytoskeleton/*metabolism
[MESH]
|Animals
[MESH]
|Cell Communication/*immunology
[MESH]
|Dendritic Cells/*immunology
[MESH]
|Fluorescence Recovery After Photobleaching
[MESH]