Imperial College London


Faculty of Natural SciencesDepartment of Life Sciences

Professor of Molecular Pathogenesis



+44 (0)20 7594 5253g.frankel




1.46Flowers buildingSouth Kensington Campus






BibTex format

author = {Goddard, P and Sanchez, Garrido J and Slater, S and Kalyan, M and Ruano, Gallego D and Marchès, O and Fernández, LÁ and Frankel, G and Shenoy, A},
doi = {10.1016/j.celrep.2019.03.100},
journal = {Cell Reports},
pages = {1008--1017.e6},
title = {Enteropathogenic E. coli stimulates effector-driven rapid caspase-4 activation in human macrophages},
url = {},
volume = {27},
year = {2019}

RIS format (EndNote, RefMan)

AB - Microbial infections can stimulate the assembly of inflammasomes, which activate caspase-1. The gastrointestinal pathogen enteropathogenic Escherichia coli (EPEC) causes localized actin polymerization in host cells. Actin polymerization requires the binding of the bacterial adhesin intimin to Tir, which is delivered to host cells via a type 3 secretion system (T3SS). We show that EPEC induces T3SS-dependent rapid non-canonical NLRP3 inflammasome activation in human macrophages. Notably, caspase-4 activation by EPEC triggers pyroptosis and cytokine processing through the NLRP3-caspase-1 inflammasome. Mechanistically, caspase-4 activation requires the detection of LPS and EPEC-induced actin polymerization, either via Tir tyrosine phosphorylation and the phosphotyrosine-binding adaptor NCK or Tir and the NCK-mimicking effector TccP. An engineered E. coli K12 could reconstitute Tir-intimin signaling, which is necessary and sufficient for inflammasome activation, ruling out the involvement of other virulence factors. Our studies reveal a crosstalk between caspase-4 and caspase-1 that is cooperatively stimulated by LPS and effector-driven actin polymerization.
AU - Goddard,P
AU - Sanchez,Garrido J
AU - Slater,S
AU - Kalyan,M
AU - Ruano,Gallego D
AU - Marchès,O
AU - Fernández,LÁ
AU - Frankel,G
AU - Shenoy,A
DO - 10.1016/j.celrep.2019.03.100
EP - 1017
PY - 2019///
SN - 2211-1247
SP - 1008
TI - Enteropathogenic E. coli stimulates effector-driven rapid caspase-4 activation in human macrophages
T2 - Cell Reports
UR -
UR -
VL - 27
ER -