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2015 ; 194
(3
): 1261-73
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Apoptosis-associated speck-like protein containing a CARD forms specks but does
not activate caspase-1 in the absence of NLRP3 during macrophage swelling
#MMPMID25552542
Compan V
; Martín-Sánchez F
; Baroja-Mazo A
; López-Castejón G
; Gomez AI
; Verkhratsky A
; Brough D
; Pelegrín P
J Immunol
2015[Feb]; 194
(3
): 1261-73
PMID25552542
show ga
Apoptosis-associated speck-like protein containing a C-terminal caspase
recruitment domain (ASC) is a key adaptor molecule required for the inflammatory
processes. ASC acts by bridging NLRP proteins, such as NLRP3, with procaspase-1
within the inflammasome complex, which subsequently results in the activation of
caspase-1 and the secretion of IL-1? and IL-18. In response to bacterial
infection, ASC also forms specks by self-oligomerization to activate caspase-1
and induce pyroptosis. Hitherto, the role of these specks in NLRP3 inflammasome
activation in response to danger signals, such as a hypotonic environment,
largely has been unexplored. In this article, we report that, under hypotonic
conditions and independently of NLRP3, ASC was able to form specks that did not
activate caspase-1. These specks were not associated with pyroptosis and were
controlled by transient receptor potential vanilloid 2 channel-mediated
signaling. However, interaction with NLRP3 enhanced ASC speck formation, leading
to fully functional inflammasomes and caspase-1 activation. This study reveals
that the ASC speck can present different oligomerization assemblies and
represents an essential step in the activation of functional NLRP3 inflammasomes.