common links between corticosteroid resistance and inflammatory lung diseases
DESCRIPTION
Common links between Corticosteroid Resistance and Inflammatory Lung Diseases. Ian Adcock National Heart and Lung Institute, Imperial College London. Overview. Steroid resistance occurs in airways disease Inflammatory signalling pathways modulate GR function MAPK, JAK/STAT, NF- k B - PowerPoint PPT PresentationTRANSCRIPT
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Common links between Corticosteroid Resistance and Inflammatory Lung
Diseases
Ian Adcock
National Heart and Lung Institute,Imperial College London
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Overview• Steroid resistance occurs in airways
disease• Inflammatory signalling pathways
modulate GR function– MAPK, JAK/STAT, NF-kB
• Oxidative stress from cigarette smoke affects GR function– Affects GR nuclear translocation
• INFLAMMATORY PATHWAYS REDUCE THE ABILITY OF ACTIVATED GR TO ENTER THE NUCLEUS
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Worldwide prevalence of inflammatory lung diseases
Donnelly & Rogers 2008
Reduced steroid responsiveness seen in severe asthma, COPD, CF and IPF – all chronic inflammatory diseases – associated with oxidative stress and – activation of intracellular transcription pathways
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NF-kB is a key mediator of inflammation
p65
p50
IL-1
TNF
LPS
haematopoieticcytokines
Oxidativestress
UV light
TLRs
Cigarette Smoke
Cytokines (IL-6, IL-8, etc)
Adhesion molecules(e.g. ICAM)
inflammatory enzymesiNOS, COX-2
Receptors
NF-kB is central to inflammatory processes
But other TFs also important in cell/stimulus context
0
20
40
60
80
Nucl
ear
stain
ing (
%)
NormalAsthmatic
AsthmaNormal
Normal
COPD
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TNFaIL-1 , b TLRs
AP-1
Ras
MEKK-1
JNKK
JNK
P
P
FOS
JUN
NF-AT
CaN
NF-ATc
NF-ATc
P
AP-1
Antigen
STAT
JAK
STAT
P P
Cytokines
NF-kB
TNFa
IkB Kinase
Ub-Proteasome
NF-kB
IkBP
Stimuli
Cytoplasm
Nucleus
NF-kB and other transcription factors
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Skin Blanching Response to Topical Budesonide
SRSS
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Severe asthma macrophages have less steroid-suppression of cytokine release
GM-C
SF IN
F-IL
-10
IL-1 IL
-6IL
-8
MCP-1
TNF-
RANTES
MIP
-1
0
25
50
75
100
Dexamethasone 10-6 M
**
* ** **
*
Severe asthma
non-severe asthma
non asthmatic
% c
yto
kin
e re
leas
e re
lati
ve t
oL
PS
-sti
mu
lati
on
alo
ne
Bhavsar et al , Thorax 2008
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Co-repressor
Mechanisms of steroid action
IkBa, GILZAP-1/NF-kB
X
O
OH
CH2OH
C=OOHCH3
CH3 CH3
F
Cell membrane
OOH
CH2OHC=O
OHCH3
CH3 CH3
F
O
OH
CH2OHC=O
OHCH3
CH3 CH3
FO
OH
CH2OHC=O
OHCH3
CH3 CH3
F
O
OH
CH2OHC=O
OHCH3
CH3 CH3
F
Ligand binding
Nuclear translocation
DNA binding/co-activator function Co-repressor recruitment/activity
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0
1
2
3
4
5
0
1
2
3
4
5
Baselin
e t
ota
l G
R/
-acti
n
(fo
ld s
tan
da
rd p
rote
in)
0
1
2
3
4
5 **
Non-asthmatics
(n=10)
Asthmatics(n=14)
Baselin
e t
ota
l G
R/
-acti
n
(fo
ld s
tan
dard
pro
tein
)
US 30 min 1 h 2 h 4 h0
1
2
3
4
Dexamethasone 10-7 M
Non-asthmatics (n=5)Non-severe asthmatics (n=8)Severe asthmatics (n=7)
*##
#
Nu
cle
ar
GR
/TB
P v
s U
S
Reduced GR expression and nuclear translocation in ASM cells from severe
asthma
Chang et al., 2012
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MAPKs
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0
100
200
300
+---
-
- -
-++
++ +
+
+
IL-2, IL-4PMA/ PHADex
GM
-CS
F p
g/m
l
+--
NS
*
* ** ** *
IL-2/IL-4 induces dex-insensitivity in PBMCs
Irusen et al., 2002
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GR nuclear translocation is reduced in IL-2/IL-4 treated U937 cells: role of p38
MAPKNuclear extract
GR
Lamin A
Dex (10-7M)- + - +
IL-2/IL-4 -- + +
Yasuo To/Kaz Ito
IL-2 + IL-4
SB 205380 (1mM)
IP- GR in PBMCs
+
+
+
- +
++
----
-
Therefore postulated that p38 MAPK drives relative steroid resistance in severe asthma
Targets reduced GR nuclear import
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Enhanced p38 MAPK activity in PBMC and ASMC of severe asthma
Non-Severe Severe0.0
0.5
1.0
1.5*
p-p3
8 M
APK
/tota
l p38
MAP
K (F
old
US
)
LPS 10 ng/ml
Khorasani et al, 2012 Chang et al, 2012
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p38 MAPK sensitivity in BAL macrophages from patients with severe asthma
Æp38 Dex
& Dex
Æp38
Æp38 Dex
& Dex
Æp38
Æp38 Dex
& Dex
Æp38
0
25
50
75
100 * **
IL-1b IL-6 MIP-1 a
% c
ytok
ine
rele
ase
com
pare
d to
LPS
alo
ne
Bhavsar et al., 2008
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GW856553 enhances CS mediated suppression of LPS-induced CXCL8 release in severe asthma
0
20
40
60
80
100
+GW 10-9M
+ GW 10-10M
-9 -8 -7 -6
***
***
***
***
Dex [Log M]
% I
L-8
Su
pp
res
sio
n v
s L
PS
Bhavsar et al, 2010
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Impaired steroid responsiveness of ASM cells in severe asthma
Po-Jui Chang
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GW856553 enhances dex-mediated suppression of TNFα-induced CCL11 release in severe asthmatics
Chang et al, 2012
ASM cells
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Targeting p38 MAPK restores steroid sensitivity in COPD macrophages
Kent et al., JPET 2009
MAPK activation in airway disease affects GR nuclear import and function
Opportunity for new combination drugs
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Other signalling pathways
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JAK-STAT signalling pathwayJAK is an associated tyrosine kinase.
Upon receptor activation, it phosphorylatesseveral tyrosine residues on the receptor.
An inactive STAT binds the phosphorylated receptor. It is then phosphorylated byJAK and dissociates.
Cytokine receptors
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0
25
50
75
100
125
-12 -10 -8 -6 -4IFNlog [Drug (M)]
CX
CL
10 (
% C
on
tro
l)
0
25
50
75
100
125
-12 -10 -8 -6 -4IFNlog [Drug (M)]
CX
CL
10 (
% C
on
tro
l)
Airway epithelial cells (BEAS2B, primary cells)
• JAK inhibitor more effective with IFNγ+TNFα (X-talk with NF-κB signalling)
• No effect on IL-1-induced IL-6 (steroid responsive)
• IFNγ-induced CXCR3 chemokines (CXCL9, CXCL10, CXCL11) (relatively steroid ineffective)
JAK inhibitor
Dexa
IFNγ-induced CXCL10 release
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STAT6 activation in severe asthma
Mullings et al., J Allergy Clin Immunol. 2001
Normal
Severe asthma Mild asthma
Mild asthma
STAT6 STAT6
STAT6 control
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STAT4 activation in COPD
Di Stefano et al., ERJ 2004
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Viral infection activates STAT signalling
Kong et al., BBRC 2003
Human Epithelial cells
Liu et al., JBC 2008
EGFR mutant (K721R) kinase inactive defective STAT activation
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RV16 infection attenuates steroid function
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RV16 infection reduces GR nuclear import:
reversed by NF-kB and JNK inhibitors
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LY reverses Bud-insensitivity induced by IL-17
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Smoking and oxidative stress
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-5
0
5
10
15
20
25
30
Chan
ge in
mor
ning
PE
F (%
)
Placebo
Fluticasone (1mg/day)
Non-smokers (n=21)
Sputum Eos 0 -1.8*% change
**
Chalmers GW et al: Thorax 2002
Smoking and steroid responses in asthma
Smokers (n=17)
0 0
Cigarette smoking inhibits the inflammatory response to corticosteroids in asthma
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NAC (-)NAC (+)
0
1000
2000
3000
IL-1bH2O2
- - + +
- + - +
IL-8
(pg/m
l)
*
#
†
IL-8
(pg/m
)
GM
-CSF
(pg/m
)
0
1000
2000
3000IL-8GM-CSF
0
200
400
600
A-549 cells
- - + + IL-1b- + - + H2O2
**
#
**
# #
Oxidative stress enhances IL-1b-stimulated inflammatory gene expression
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BUD FP
Oxidative stress reduces corticosteroid activity
-12 -10 -8 -60
20
40
60
80
IL-1IL-1 plus H2O2
Log[BUD], M
CX
CL
8 s
tim
ula
tio
n (
% c
on
tro
l)
-14 -12 -10 -8 -60
20
40
60
80
IL-1IL-1 plus H2O2
Log[FP], MC
XC
L8 s
tim
ula
tio
n (
% c
on
tro
l)
Amir Hakim 2012
? Importance in COPD, smoking asthma and severe asthma
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Oxidatives stress reduces GR nuclear translocation
TATA BP
Nuclear GR
* p < 0.05 vs baseline # p < 0.05 vs. corticosteroid
#
*
#
*
BUD FP
Due to effects on Importin 7/Ran GTP systemAmir Hakim 2012
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Summary• Chronic inflammation is associated with relative
corticosteroid insensitivity• Linked to activation of key transcription pathways
• NF-kB• p38 MAPK• JAK/STAT activation
– Viral infection and exacerbation• Oxidative stress
• Affects NF-kB-dependent transcription• ROS stress also affects GR function
• GR nuclear import/expression, HDAC2
• The current drivers for excessive pathway activation are unknown in disease – not affect therapeutic strategies
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Acknowledgements
Funded by:
Fan Chung Peter J. BarnesKazuhiro ItoPank BhavsarMark HewJohn MatthewsElvis Irusen John MarwickKarina Enesa Paul EvansAmir Hakim Elen Jazrawi
Nadia KhorasaniPo-Jui ChangLouise Donnelly
Imperial College Trust
NIH-RO1 grant HL-69155
Alberto PapiGaetano CaramoriAntonino Di Stefano
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Is There Anything Common between Corticosteroid Resistance and Inflammatory Lung Diseases?
30 mins
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Increased oxidative stress in COPD
Smoker
COPD0 25 50 75 100 125 150
0
1
2
3
FEV1 (% pred.)
r= -0.76p<0.05
4
4-HNE staining
Irfan Rahman
Kinnula et al., ERJ 2007
Brindicci et al., Chest 2007
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Altered glutathione homeostasis in children with severe asthma: ELF
measurements
Fitzpatrick et al., JACI 2009
31 6 31 25
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Sputum 8-isoprostane in severe asthma
Wood et al., AJRCCM 2005
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Macrophage
IL-6IL-8GM-CSFTNFPDGFPGE2
Proteases
Epitheium
IL-1IL-6IL-8 GM-CSFEicosanoids
Migration
TNF-INF-PDGF
EosinophilIL-3IL-5IL-6GM-CSF
MigrationAdhesion
TNF-TGF-/-
T-lymphocyteIL-2INF-GM-CSF
Migration
NeutrophilIL-3IL-4IL-5IL-6
IL-1IL-8GM-CSF
Adhesion
Endothelium
Cytokines, Cigarette smoke, infectious agents
Inflammatory mediators in respiratory disease
Mast Cell
IL-3IL-4IL-5IL-6
TNF-
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Clinical phenotypes of asthma
Bel EH, Curr Opin Pulm Med 2004;10:44-50Wenzel S, Lancet 2006;386:804-813
Eosinophilicsteroid-responsive
ExacerbationproneSevere
Fixedobstruction
Allergic
Reduced steroid responsiveness in severe asthma, COPD, CF and IPF – all chronic inflammatory diseases – associated with oxidative stress and – activation of intracellular transcription pathways
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PNAS 2012
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Dura
tion o
f p6
5-
dsR
ed n
ucl
ear
loca
lisati
on (
min
)
0 100 2000
100
200
300
400
500
600
H2O2 (mM)
+IL-1b
Oxidative stress prolongs NF-B activity by suppressing its nuclear export
HeLa cells
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Non-stim IL-1b + H2O2IL-1b
60 mins
IL-1bH2O2
TSA
--
-
-+
-
+-
-
++
-
--
+
+-
+
Acetylated H4 IP
NF-kB p65 IP
INPUT
ROS stress does not enhance rate of p65 nuclear entry: stimulates histone acetylation
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HDAC activity
Control CSM 0.150
2500
5000
7500 **
HD
AC
act
ivit
y(A
FU
/10
g)
Cigarette smoke reduces HDAC activity in macrophages
Y146 - activityY253 - expression