A20 in inflammatory signaling and pathology · multiple sclerosis, IBD, atherosclerosis, diabetes,...
Transcript of A20 in inflammatory signaling and pathology · multiple sclerosis, IBD, atherosclerosis, diabetes,...
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A20 in inflammatory signaling
and pathology
Geert van Loo
VIB Inflammation Research Center
Gent University
FAPESP/EU-LIFE Scientific Workshop
Sao Paulo - Brasil
June 8, 2016
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IBD Optineurin
NF-kB
InflammationTLR
TNFNecroptosis FADD
caspase
ER stress
Autophagy
Apoptosis
A20IL-1
inflammasome
Rheumatoid arthritis
psoriasis
Tissue homeostasis
Multiple sclerosis
MALT
RIP1
inflammasome
SLE
Autophagy
ER stress
A20NIKOtulin
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NF-kB signalling pathways
ProinflammatoryUV Oxidants VirusesBacteria
Cytokines(TNF, IL-1)
NF-kB
INFLAMMATION(Rheumatoid arthritis, asthma,
multiple sclerosis, IBD, atherosclerosis,
diabetes, septic shock)
Cytokines Chemokines Enzymes Adhesion
proteinsAnti-apoptotic
proteinsIL-6,
GM-CSF,IL-8 iNOS ICAM-1 IAP-1/2
TNF, IL-1,
IL-2
RANTES COX VCAM-1 IEX-1L
A20MIP-1 E-selectinMCP-2
Cell cycle
C-myc
Cyclin D1
REGULATION !
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stimulus
nucleus
NEMO
receptor
IKK-complex
a bP P
p65p50
IkBa
p65p50
IkBa
p65p50
IkBaP P
p65p50
P PUb
UbUb
Ub
Regulation of NF-kB signalling by A20
OTUA20
NF-kB responsive genes
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stimulus
nucleus
NEMO
receptor
IKK-complex
a bP P
p65p50
IkBa
p65p50
IkBa
p65p50
IkBaP P
p65p50
P PUb
UbUb
Ub
Regulation of NF-kB/apoptosis signalling by A20
OTUA20
NF-kB responsive genes
8 8
apoptosis
FA
DD
FA
DD
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The Zn-finger protein A20
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LIVER
KID
NEY
CO
LON
JOIN
TSK
IN
Lee et al., Science, 2000
The Zn-finger protein A20
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A20 and autoimmune disease
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XE3
A20FL/FL gene
E4
LysM CRE
E5
A20 deletion in myeloid cells
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WT A20myel-KOA20myel-KO WT
0
10
20
30
40
LysMA20 WT
Weig
ht (g
)
A20myel-KO WT
Matmati, Jacques et al., Nat. Genet., 2011
A20myel-KO mice develop spontaneous arthritis
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In vitro
TNF secretion by resident pMΦ
WT A20myel-KO0
10
20
30
40
50
60 *
TN
F (
pg
/ml)
TNF secretion by thioglycollate-induced pMΦ
WT A20myel-KO0
50
100
150
200
250 *IL
-6 (
pg
/ml)
WT A20myel-KO0
500
1000
1500
2000
*
TN
F (
pg
/ml)
WT A20myel-KO
/ 15’ 30’ 45’ 60’ 120’ / 15’ 30’ 45’ 60’ 120’
IkBa
actin
Matmati, Jacques et al., Nat. Genet., 2011
A20myel-KO mice spontaneously produce inflammatory cytokines
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A20 controls inflammatory cytokine production in myeloid cells
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Arthritis in myeloid A20 knockout mice is MyD88 and IL-6 dependent
Matmati, Jacques et al., Nat. Genet., 2011
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Arthritis in myeloid A20 knockout mice is IL1 dependent
Vande Walle et al., Nature, 2014
Collaboration with Mohamed Lamkanfi
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A20myel-KO BMDMs are hypersensitive to activation of
the Nlrp3 inflammasome
Vande Walle et al., Nature, 2014
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Step 1
(priming)
Step 2
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A20 inhibits Nlrp3 inflammasome priming
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A20 inhibits Nlrp3 inflammasome priming
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Arthritis in A20myel-KO mice is Nlrp3 inflammasome dependent
Vande Walle et al., Nature, 2014
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Spontaneous NLRP3 inflammasome activity in macrophages from
patients with TNFAIP3 mutations
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Myeloid A20 deficiency promotes osteoclastogenesis
Splenocyte cultures 6 days treated with M-CSF+RANKL
WT A20myel-KO
0
10
20
30
40 *
Nu
mb
er
TR
AP
+ c
ell
s
WT A20myel-KO
0
10
20
30
40
50 *
Perc
en
t P
it f
orm
ati
on
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Myeloid /osteoclast A20 deficiency
OTU
A20
TNFR1
TNF
p65p50
IkBaP
P
NEMO IKK-complex
a b
P P
p65p50
RIP1
Inflammatory responses
RANK
RANKL
p65p50
IkBaP
P
NEMO IKK-complex
a b
P P
p65p50
TRAF6
osteoclastogenesis
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Osteoclast A20 deficiency induces severe osteoporosis
A20 FL/FL Ctsk/Cre +/+ A20 FL/FL Ctsk/Cre Tg/+
Micro-CT
Martens et al., unpublished
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A20 inhibits RANK-induced NF-kB signaling
Transient transfection HEK-293T
ctrl RANK A20 RANK + A200
1000
2000
rela
tive l
ucif
era
se a
cti
vit
y (
*E3) *
Martens et al., unpublished
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XE3
A20FL/FL gene
E4
Villin CRE
E5
A20 deletion in the intestinal epithelium
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A20 in IECs is dispensible for normal intestinal development
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A20IEC-KO mice are highly sensitive to DSS colitis and TNF toxicity
Vereecke et al., J. Exp. Med., 2010
0 1 2 3 4 5 6 7 8 9 10 11 12 13
0
1
2
3
4
WT
A20 IEC-KO
1.5% DSS H2O
time (days)
Clin
ica
l s
co
re
* * *
DSS colitis TNF lethality
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A20IEC-KO mice are highly sensitive to DSS colitis and TNF toxicity
TUNEL
WT A20IEC-KO
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A20 deficient IECs are highly sensitive to inflammatory cytokines
Vereecke et al., Nat. Commun., 2014
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A20 protects IECs from TNF-induced apoptosis
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A20 deletion in IECs and myeloid cells
XE3
A20FL/FL gene
E4
Villin CRE
E5
LysM CRE
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A20IEC/myel-KO mice spontaneously develop intestinal inflammation
Vereecke et al., Nat. Commun., 2014
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A20IEC/myel-KO mice have reduced Paneth and goblet cell numbers
Cryp
t-1 in
situ
WT A20IEC/MYEL-KO
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Epithelial hyperproliferation in A20IEC/myel-KO mice
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Severe colitis in aged A20IEC/myel-KO mice
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Aged A20IEC/myel-KO mice develop colorectal tumors
WT A20IEC/Myel-KO
A20IEC/myel-KO
β-c
ate
nin
Sox-9
Olfm
4
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A20IEC/myel-KO mice
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X
A20FL/FL
CNS CRE
A20 in neuroinflammation
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Hisahara et al. , 2003
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oligodendrocyte
target cells vs. effector cells
neuron
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target cells vs. effector cells
astrocytemicroglia
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A20 in CNS inflammation and MS pathology
Mc Guire et al., unpublished
CNS (nestin-cre) neurons (Thy1.2-cre)
astrocytes (GFAP-cre) oligodendrocytes (MOGi-cre)
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Microglia A20 deficiency strongly sensitizes to EAE
Voet, Mc Guire et al., unpublished
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Microglia A20 deficiency strongly sensitizes to EAE
A20FL A20Cx3Cr1-KO
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A20 controls Nlrp3 inflammasome activation in microglia
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A20 controls Nlrp3 inflammasome activation in microglia
Voet, Mc Guire et al., unpublished
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Acknowledgements
CollaboratorsMohamed Lamkanfi, Lieselotte Vande Walle, VIB and UGent, Belgium
Dirk Elewaut, Peggy Jacques, VIB and UGhent, Belgium
Rudi Beyaert, VIB and Ugent, Belgium
Hans Clevers, Johan Van Es, Hubrecht Institute, Utrecht, The Netherlands
Marco Prinz, Peter Wieghofer, Freiburg, Germany
Conor Mc Guire (ex)
Mourad Matmati (ex)
Jonathan Maelfait (ex)
Lars
Vereecke
Esther
Hoste
Leen
Catrysse
Karolina
Slowicke
Sofie
Voet
Arne
Martens
Mozes
Sze
Hanna
Vikkula