Targeting SWI/SNF/Hippo pathway in Squamous Cancers Srinivas Vinod Saladi Ph.D. Chabner Colloquium, 2019 Squamous cell carcinoma genomic landscape: largely tumor suppressors
Squamous NSCLC Hammerman et al, Nature, 2012
Head & Neck SCC Stransky et al, Science, 2011 Lung adenocarcinoma genotypes: many potential therapeutic opportunities
AKT 1% ROS1 1.5% NRAS 1% BRAF 2% IDH1 <1% HER2 2% CTNNB1 2% ALK 3% PIK3CA 4% TP53 5% No Mutation ~40%
EGFR 15%
KRAS 23% Excision of p63 in SCC in vivo results in rapid tumor regression
Oral SCC
L/L
p63 ; K14-CreER, Tamoxifen
Controls
CreER -
Tamoxifen
K14
+/+ +/+ p63
Day 0 Day 11
Tumor Volume
CreER
-
K14 L/L L/L
Days p63 Day 0 Day 13 100mg/kg tamoxifen daily days 1-5 p63 regulates genes by association with distinct epigenetic cofactors/complexes
Cistrome analysis p63 ChIP-Seq (JHU029)
Factors TP53 TCFP2L1 NRF1 TFCP2 SMARCC1 FOS E2F1 BCL11A
FOSL2 (Ramsey, MR, He L, (Corrie LG, Ramsey SMARCA4 Forster N, et al, Cancer MR, et al, Genes & Dev, 2012) FOSL1 Research, 2011) BACH2 HDAC ACTL6A SMARCB1 RUVBL 1/2 p63 1/2 p63 TRIM28 H2AZ RUNX1 PUMA, NOXA SAMD9L p63 regulates genes by association with distinct epigenetic cofactors/complexes
Cistrome analysis p63 ChIP-Seq (JHU029)
Factors TP53 TCFP2L1 NRF1 TFCP2 SMARCC1 FOS E2F1 BCL11A Glycerol Gradient FOSL2 Smaller 440 kDa Larger SMARCA4
FOSL1
Empty
1 5 9 11 15 19
Input 7 13 17 21 3 BACH2 p63 SMARCB1 TRIM28 ACTL6A RUNX1 SWI/SNFBR-GATP1 –is dependentthe cent rchromatinal ATPas remodelinge in PBAF enzymes compl earexe highlys heterogeneous
PBRM1 BRD7 P-BAF ARID2 BRG1
ATPase subunits
PBAF-specific subunits
BAF-specific subunits
BRM SS18 Core subunits BRD9 ARID1A/ ARID1B BAF SWI/SNF complexes control nucleosome position
DPF 1/2/3 BCL11 BRD9 A/B SS18 BAF BCL7 47 A/B/C ARID1A/ BRG1/ β-actin ARID1B BAF 60 BRM A/B/C SWI/SNF binding at BAF 53 SWI/SNF BAF specific loci BAF A/B BAF 57 170 155 ATP ADP
BAF complexes Homo sapiens, Mus musculus
PHF 10 BCL11 BRD7 A/B BAF BCL7 PBRM1 47 A/B/C β-actin ARID2 BAF 60 BRG1 A/B/C BAF 53 BAF Disruption of DNA-histone contacts BAF A/B BAF 57 170 155 Eviction Sliding
PBAF complexes Homo sapiens, Mus musculus
Core subunits BAF-specific subunits
BAF & PBAF subunits PBAF-specific subunits SWI/SNF SWI/SNF complex mediated Transcriptional Regulation
Kinetochore Transcriptional regulation Chromosome Chromatin (in highly condensed form)
Anaphase Bridge Compact SWI/SNF Kinetochore è NO transcription factor accessibility Chromosome (ATP dependant)
TF Open è Transcription factor accessibility Unwinding of Chromatin
Proliferation Binding of Transcription Cell migration Factors Retinoblastoma pathway
Immune response Transcription of Genes
Embryonic stem cell and diffenciation programs
Polycomb silencing
Brownlee et al. DNA Repair 2015 Functions of SWI/SNF
SWI/SNF enzymes play a key role in transcriptional regulation, replication, DNA repair, and cell cycle control.
SWI/SNF enzymes are critical for cellular differentiation and embryonic development
SWI/SNF subunits are mutated or deleted in many forms of cancer and one of the subunits BAF47 may act as tumor suppressor.
Gastric carcinomas with lymph node metastasis over-express BRG1 and are depleted of BRM expression.
BRG1 expression is high in invasive forms of prostate cancer.
SWI/SNF complex altered in multiple cancers
BAF/PBAF subunits mSWI/SNF complex (BAF) ARID1A PBRM1 Colorectal cancer SMARCA4 Leukemia-T-ALL Synovial sarcoma ARID2 ARID1B Leukemia/lymphoma Malignant SMARCA2 Myeloma rhabdoid tumors SMARCC2 Epithiloid sarcoma SMARCC1 Ovarian clear cell carcinoma SMARCB1 BRD7 Endometriod carcinoma Medulloblastoma ACTL6B Bladder cancer Breast cancer BCL11A Hepatocellular carcinoma Lung cancer BCL11B Neuroblastoma DPF2 Squamous cell carcinoma ACTL6A Small cell lung cancer Head and neck cancer SMARCD2 Clear cell BCL7C Pancreatic cancer meningioma SMARCD1 BRD9 PHF10 PHD3 Polybromo-containing BAF (PBAF) DPF3 SMARCE1 In-frame Head and neck Clear cell renal SMARCD3 Splice cancer carcinoma SS18L1 BCL7A Missense SS18 Truncating Hepatocellular DPF1 carcinoma BCL7B Head and neck 200 400 600 800 cancer Mutations in cBioPortal 1000
Kadoch et al. Human Cancer 2015 Kadoch et al. Biochemistry 2016 SWI/SNF complex widely considered as tumor suppressor
Hodges & Crabtree, 2016 ACTL6A (Baf53a) subunit of SWI/SNF complex is
amplified in multiple cancers
Alteration Frequency Alteration ACTL6A (Baf53a) subunit of SWI/SNF complex is amplified in multiple cancers
Immunodepletion
ACTL6A SWI/SNFcomplex subunits ARID1B
ARID2
ACTL6B ACTL6A PBRM1
SMARCA2
BCL11b
SMARCE1
ACTL6A (Baf53a): Progenitor State SMARCC1 ACTL6B (Baf53b): Differentiated State β-Tubulin
(Saladi SV, et al, Epigenetics, 2011) ACTL6A is required for maintaining the progenitor state in epithelium
(Bao X et al., Cell Stem Cell ,2013) ACTL6A is co-amplified with p63 and confers poor prognosis in HNSCC
3q26 TP63 ACTL6A Genetic Alteration (n=530)
P63 ACTL6A
Epidermis
HNSCC ACTL6A is co-amplified with p63 and confers poor prognosis in HNSCC
3q26 TP63 ACTL6A Genetic Alteration (n=530)
TCGA HNSCC Kaplan-Meier Survival for
P63 ACTL6A ACTL6A Expression
Epidermis
HNSCC ACTL6A is required for tumor progression in vivo
x" x" Harvest -Dox Tumors x" x" Harvest FaDu +Dox Tumors Dox inducible Inject Tumors (Day 8) (Day 20) shACTL6A Cells (Day 0)
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Tumor Volume Tumor T 00 - Dox + Dox shACTL6A #1 #1 #2 Dox - + + ACTL6A is required for tumor progression in vivo
- Dox + Dox
x" x" Harvest -Dox Tumors x" x"
Harvest Ki67 FaDu +Dox Tumors Dox inducible Inject Tumors (Day 8) (Day 20) shACTL6A Cells (Day 0)
6 **** Control
*** shp63
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50 u Tumor Volume Tumor 80 50 T 80 **** 80 ** 00 4040 - Dox + Dox shACTL6A 6060 #1 #1 #2 3030 Dox - + + 60 4040 2020 40
2020 1010 % K13 positive K13 %
% Ki67 positive Ki67 % 20 00 00 Dox - Dox - + + 0 ACTL6A promotes transformation of mouse keratinocytes via activation of YAP
Ras ) 150 RasRas + Vector (N=21) 150 3 Ras+p63 RasRaRas++ A+pCT 6ΔNp63αL36A (N=7) RasRas+ +A CTACTL6AL6A (N=7) 100 Ras+ACTL6A+p6320 40 60 80
0 ****
100 50 ***
Tumor Volume (mm Volume Tumor 0 8 10 14 17 20 22 25 27 29 32 36 38 40 42 44 47 49 51 Days 50
0 8 10 14 17 20 22 25 27 29 32 36 38 40 42 44 47 49 51 ACTL6A promotes transformation of mouse keratinocytes via activation of YAP
Ras ) 150 RasRas + Vector (N=21) 150 3 Ras+p63 RasRaRas++ A+pCT 6ΔNp63αL36A (N=7) RasRas+ +A CTACTL6AL6A (N=7) 100 Ras+ACTL6A+p6320 40 60 80
0 ****
100 50 ***
Tumor Volume (mm Volume Tumor 0 8 10 14 17 20 22 25 27 29 32 36 38 40 42 44 47 49 51 Days 50
H&E DAPI Total-YAP Merged
ACTL6A 0 ACTL6A 8 10 14 17 20 22 25 27 29 32 36 38 40 42 44 47 49 51
YAP1
p63 ACTL6A promotes Tumorigenesis in HNSCC
P Cytoplasmic YAP1 retention
Cytoplasm Regenerative YAP1 Proliferation SWI/SNF WWC11 ACTL6A p63 GPRC5A (?)
Differentiation Nucleus
Cancer Cell, 2017 ACTL6A inhibits SMARCA4 (BRG1) and correlates to high H3K27me3 (EZH2) at its target genes SWI/SNF antagonistic to PRC2 complex
MCB, 2008
ARID1B is a specific vulnerability in ARID1A-mutant cancers. Helming KC, Wang X, Wilson BG, Vazquez F, Haswell JR, Manchester HE, Kim Y, Kryukov GV, Ghandi M, Aguirre AJ, Jagani Z, Wang Z, Garraway LA, Hahn WC, Roberts CW. Nat Med. 2014 Mar;20(3):251-4. doi: 10.1038/nm.3480. Epub 2014 Feb 23. SWI/SNF antagonizes PRC2 complex
cSCC
Kia SK,et al, Mol Cell Bio, 2008 Wilson B, et al, Cancer Cell, 2010 Saladi SV, et al, Pigment Cell & Mel Res, 2013 Poly Comb Repressor (PRC) complex
Herviou et al. Oncotarget - 2016 SWI/SNF complex subunits alterations renders cells sensitive to EZH2 inhibitors
ACTL6A ACTL6A expression correlates strongly with EZH2 expression
5,000 Pearson: 0.35 ACTL6A mutated Spearman: 0.38 EZH2 mutated Neither mutated 4,500
4,000
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E 3,500
S
R
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S
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2,500
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EZH2
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ACTL6A, mRNA expression (RNA Seq V2 RSEM) ACTL6A EZH2 in HNSCC patients
PDX (frozen) HNSCC (FFPE)
EZH2 EZH2
Scale bar represents 50μM
(PDX samples from Sara Pai) ACTL6A cooperates with EZH2 to repress differentiation programs Data 3 EZH2 0.20 0.20 IgG EZH2
0.15 0.15 IgG * * 0.10 0.10 * 0.05Input % of 0.05
0.00 0.00
1 9 4 C A F 0 L W 0 1 K W S
WWC1 WWC1 ControlS100A9 S100A9 Control 55 5 5 shACTL6A shACTL6A Control WWC1 ControlControl 4 4 4 4 shACTL6A shACTL6AshACTL6A
5 33 3 3 4 22 2 2
3 % of Input % of
% of Input % of * 11 1 1 * 2 * 00 * 0 0 1
A 7 3 G 60 2 H g A e 3 G L K I 6 M H g T 3 L 7 I C H T 2 A A 7 3 G C K 6 2 H g A 3 L K I H T 3 C H A ACTL6A cooperates with EZH2 and promotes H3K27me3 globally
ACTL6A loci Global
Control shACTL6A Control shACTL6A
6
4
2
(normalized input) to (normalized 0
-2 H3K27me3 log2 counts in 10Kb windows in H3K27me3 10Kb log2 windows counts SWI/SNF complex subunits alterations renders cells sensitive to EZH2 inhibitors EZH2 regulates differentiation program in SCC
FaDu UT
6 100nM * 500nM 125 FaDu 125 125 Cal33 4 SCC4 100100 SCC4 * 100 HaCaTHaCaT * 75 2 *
y 75
t
i l i 50 b 75 50
a 0
i Relative mRNA levels Relative
% % Viable Cells 2525 A 1 V 5 C C 50 R W W % 0 0 P 0 0 1 1 102 1003 10004 100005 G FaDu 25 Log nM Tazemetostat 60 UT 100nM 0 HaCaT to FaDu:p= 0.043 * 500nM 0 1 2 HaCaT to3 SCC4: p=0.0134 40 * Conc (Log10 Scale) * 20 * * *
0 Relative mRNA levels Relative L 0 9 V 1 A I K 0 0 1 S One way ANOVA, multiple comparisions High mutation load in HNSCC
Lawrence M, et al Nature, 2013 ACTL6A correlates to high mutation load in HNSCC
800 Rho = 0.64
700 p = 1.4e-04
600 More Mutation Load 500 400 Better response to Immune 300 check point inhibitors
Total mutations # Total 200 100 0 -5 -4.5 -4 -3.5 -3 ACTL6A expression ACTL6A correlates to high mutation load in HNSCC
EV BRG1
800 Rho = 0.64
700 p = 1.4e-04 Control
600 500 400 30 min post 300 Cisplatin
Total mutations # Total 200 100 0 -5 -4.5 -4 -3.5 -3 2 hr post ACTL6A expression Cisplatin
Comet Assay High Mutation Load Predicts Better Clinical Outcome to Immune Check Point Inhibitors
Riaz N, Cell, 2017 High Mutation Load Predicts Better Clinical Outcome to Immune Check Point Inhibitors
Only 15-20% respond to Immune Check Point Inhibitors in HNSCC
Ferris R, et al , NEJM, 2016 ACTL6A mediated immune modulation in HNSCC
Repressed Programs HNSCC Cells
BROWNE_INTERFERON_RESPONSIVE_GENES Predicts PD1/PD-L1 response in HNSCC HLA-DRA CXCL-10 STAT1/2 PDL-2 Cytotoxic T Cell Factors Control/shACTL6A; HIGH LOW Granzyme A,B
HNSCC Primary Tumors IL-2R, 9R, 21R PD1_LIGATION_VS_CTRL_IN_ACT_TCELL_LINE_UP ICOS co-stimulator HLA Components HLA-B, C, E HLA-DRA, B6, B1; -DPA1, B1 TNF Family Members Fas Ligand Correlation with ACTL6A; HIGH LOW Lymphotoxin Alpha, Beta ACTL6A suppresses the InterferonG gene subset thereby evading the tumor immune response
Ctrl shACTL6A Predictive Treatment Model for HNSCC patients: Epigenetic therapy coupled with Immunotherapy
BRG1/BRM
) EZH2 ACTL6A Immunologically Cold Tumors
EZH2i
BRG1/BRM
) Reactivation of Immune program EZH2 (Interferon gamma responsive genes, ACTL6A T Cell responsive genes)
Immune Checkpoint Blockade
Better Clinical response (Saladi SV, et al., Manuscript in prep) EZH2 and DNMT inhibitors reactivate Immune program
TLR3
20 30 4 STAT1 CXCL10 Ctrl Ctrl
15 A EZH2 100 EZH2 100 N 3
20 R EZH2 1uM EZH2 1uM m Decitabine 100nm
10 e 2 Decitabine 100nm
v i t Decitabine 1uM
a Decitabine 1uM
10 l e
Relative mRNA Relative 5
R 1
0 0 0 l l l tr 0 M m M tr 0 M m M tr 0 M m M C 0 u n u 0 u n u 0 u n u 1 1 0 1 C 1 1 0 1 C 1 1 0 1 2 0 2 0 2 0 2 1 e 2 1 e 2 1 e H H in H H in H H in Z Z e b Z Z e b Z Z e b E in a E in a E in a E b it E it E b it a c b c c it e ta e ita e c ci c e D e D e D D D D Predictive Treatment Model for HNSCC patients: Epigenetic therapy coupled with Immunotherapy
BRG1/BRM
) EZH2 HDAC1/2 ACTL6A Immunologically Cold Tumors
HDACi EZH2i
BRG1/BRM
) Reactivation of Immune program
HDAC1/2 EZH2 (Interferon gamma responsive genes, ACTL6A T Cell responsive genes)
Immune Checkpoint Blockade
Better Clinical response (Saladi SV, et al., Manuscript in prep) ACTL6A, subunit of SWI/SNF complex is a driver oncogene in HNSCC
Tumors Regenerative Proliferation ACTL6A ACTL6A Immune evasion ACTL6A Differentiation EZH2 SMARCA4/A2 H3K27Me3
Differentiated Epithelium ACTL6AX Differentiation EZH2X SMARCA4/A2 H3K27Me3 ACTL6A/YAP-dependent regenerative program in squamous carcinomas
GSEA analysis with BRD4 inhibition(JQ1 treatment) in all cancer cell line
CORDENONSI_YAP_ EPITHELIAL_MESENCHYMAL INTERFERON_GAMMA APOPTOSIS )
S CONSERVED_SIGNATURE _TRANSITION _RESPONSE E ( 0.0 e 0.0 r 0.4 o -0.2
c -0.2 0.0
s
t -0.4 0.2 n -0.4 -0.2 e -0.6 m -0.6 0.0 h -0.8
c -0.4
i
r
n E Acknowledgements
Saladi Lab MEEI MGH Cancer Center Nana Chen Mark Varvares Michael Lawrence Rozenn Riou Kevin Emerick Leif Ellisen Nicholas Abt Derrick Lin Pavan Kannan Genevieve Boland MGH CRM Muna Alhusban Jayaraj Rajagopal Bradley Bernstein Brian Lin Soldano Ferrone Robert Morris Dana Farber Martin Sattler David Frank Funding