Abstract:
:Mixed lineage kinase domain-like (MLKL) is the terminal protein in the pro-inflammatory necroptotic cell death program. RIPK3-mediated phosphorylation is thought to initiate MLKL oligomerization, membrane translocation and membrane disruption, although the precise choreography of events is incompletely understood. Here, we use single-cell imaging approaches to map the chronology of endogenous human MLKL activation during necroptosis. During the effector phase of necroptosis, we observe that phosphorylated MLKL assembles into higher order species on presumed cytoplasmic necrosomes. Subsequently, MLKL co-traffics with tight junction proteins to the cell periphery via Golgi-microtubule-actin-dependent mechanisms. MLKL and tight junction proteins then steadily co-accumulate at the plasma membrane as heterogeneous micron-sized hotspots. Our studies identify MLKL trafficking and plasma membrane accumulation as crucial necroptosis checkpoints. Furthermore, the accumulation of phosphorylated MLKL at intercellular junctions accelerates necroptosis between neighbouring cells, which may be relevant to inflammatory bowel disease and other necroptosis-mediated enteropathies.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Samson AL,Zhang Y,Geoghegan ND,Gavin XJ,Davies KA,Mlodzianoski MJ,Whitehead LW,Frank D,Garnish SE,Fitzgibbon C,Hempel A,Young SN,Jacobsen AV,Cawthorne W,Petrie EJ,Faux MC,Shield-Artin K,Lalaoui N,Hildebrand JM,Silkedoi
10.1038/s41467-020-16887-1subject
Has Abstractpub_date
2020-06-19 00:00:00pages
3151issue
1issn
2041-1723pii
10.1038/s41467-020-16887-1journal_volume
11pub_type
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