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2015 ; 5
(ä): 10082
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The T cell receptor resides in ordered plasma membrane nanodomains that aggregate
upon patching of the receptor
#MMPMID25955440
Dinic J
; Riehl A
; Adler J
; Parmryd I
Sci Rep
2015[May]; 5
(ä): 10082
PMID25955440
show ga
Two related models for T cell signalling initiation suggest either that T cell
receptor (TCR) engagement leads to its recruitment to ordered membrane domains,
often referred to as lipid rafts, where signalling molecules are enriched or that
ordered TCR-containing membrane nanodomains coalesce upon TCR engagement. That
ordered domains form upon TCR engagement, as they do upon lipid raft marker
patching, has not been considered. The target of this study was to differentiate
between those three options. Plasma membrane order was followed in live T cells
at 37?°C using laurdan to report on lipid packing. Patching of the TCR that
elicits a signalling response resulted in aggregation, not formation, of ordered
plasma membrane domains in both Jurkat and primary T cells. The TCR colocalised
with actin filaments at the plasma membrane in unstimulated Jurkat T cells,
consistent with it being localised to ordered membrane domains. The
colocalisation was most prominent in cells in G1 phase when the cells are ready
to commit to proliferation. At other cell cycle phases the TCR was mainly found
at perinuclear membranes. Our study suggests that the TCR resides in ordered
plasma membrane domains that are linked to actin filaments and aggregate upon TCR
engagement.