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INTEGRATED ANALYSIS OF THE MOLECULAR DEREGULATIONS OF THE MDM2:P53 AXIS IN DDLPS KATE LYNN BILL,...
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Transcript of INTEGRATED ANALYSIS OF THE MOLECULAR DEREGULATIONS OF THE MDM2:P53 AXIS IN DDLPS KATE LYNN BILL,...
INTEGRATED ANALYSIS OF THE MOLECULAR DEREGULATIONS OF THE MDM2:P53 AXIS IN DDLPS
KATE LYNN BILL, JEANNINE GARNETT, CHAD CREIGHTON, XIAOYAN MA, ISABELLE MEAUX, LAURENT DEBUSSCHE, THERESA NGUYEN, DAVIS INGRAM, SVETLANA BOLSHAKOV, ROMAN BELOUSOV, DINA LEV, ALEXANDER J. LAZAR, RAPHAEL POLLOCK
MD ANDERSON CANCER CENTER, Houston Tx
Anaya et al. Ann Surg 2009; 16(3)667-75Lahat et al. Ann Surg Oncol 2008; 15(6):1585-1593
WDLPS
DDLPSWDLPS
DDLPS
Local recurrence Disease specific survival
DDLPS: marked propensity for local recurrence and dismal outcome
Disclosures
• Provided drug (SAR405838) for studies under
MTA
• Sanofi reviewed this presentation – no significant
changes
• Referred to as “inhibitor” in this talk
MDM2 amplifications in Cancer
Tumor type MDM2 amplification (na) (%)Brain tumors 6.7 (239)
Astrocytomas 8.1 (37)Glioblastomas 6.8 (191)Medulloblastomas 0 (8)Other 0 (3)
Breast carcinomas 5.9 (1774)Cervical carcinomas 1.1 (88)Esophageal carcinomas 13 (96)Leukemias/lymphomas 0 (304)Hepatoblastomas 0 (38)Lung 5.7 (88)
Lung cancers (NSCLC) 6.0 (83)Lung (not specified) 0 (5)
Nasopharyngeal carcinomas 2.1 (46)Neuroblastoma 2.0 (51)Osteosarcomas 16 (207)Ovarian carcinomas 3.1 (190)Pancreatic carcinomas 0 (25)Soft tissue tumors 20 (479)
Ewing’s sarcomas 10 (30)Leiomyosarcomas 0 (46)Lipomas (benign) 30 (43)Liposarcomas 29 (87)Undifferentiated pleomorphic sarcoma
21 (163)
Malignant Schwannomas 19 (16)
Sarcomas (non-specific)b 13 (85)
Variousc 33 (9)Testicular tumors 4.6 (64)Thyroid carcinomas 0 (22)Urothelial carcinomas 2.2 (137)Wilms’ tumors 0 (40)
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MDM2: potential target for cancer therapy
Small molecule inhibitors:• Nutlin• RG7112• SAR405838
Wang, S. et al., Pharm Taxicol, 2009.
MDM2 Inhibitor: SAR405838
Orally bioavailable small molecule
Single-digit nM binding to hMDM2, high selectivity and specificity
Blocks interaction of MDM2 & P53
Inactive in p53 mut cell lines
Phase I initiated mid-2012 Safety and efficacy Biomarker development
NHCl
NH
F
ClO
NH
OH
O
SAR299155
MW: 562.51
(Formerly: SAR299155 or MI-77301)
MDM2 Amplification and Overexpression in DDLPS
PA
A 22
4
24
6
86
3
14
1
81
5
SW
872
PLS
-1
DDLPSS
MDM2
β -actin
gDNA RNA
**
*
*
Systematic characterization of DDLPS cell lines
4 DDLPS cell lines were treated with SAR405838
ProteomicsmRNAmiRNADNA copy number
variation*
DNA Sequencing*
*Previously reported data
Experimental Outline
two independent biological replicates
224 815 246 863
cell lines were either treated with 0.003% DMSO,
1 µM or 3 µM SAR405838 (24hrs)
Analysis for differential gene
expression/miRNA array
Differential Gene Expression with SAR405838 Treatment
Pathway/processenrichment
p53 regulated targets
12q13~15 amplified targets
>2 fold upregulated or downregulated genes in at least 3 cell lines
Top Deregulated Pathways: Ingenuity Pathway Analysis
P53 signaling / Cell cycle / DNA damage
Upregulated mRNA in DDLPS Downregulated by the MDM2:p53 Axis
UPREGULATED TRANSCRIPTS IN
DEDIFFERENTIATED LIPOSARCOMA CELLS
523
DOWNREGULATED TRANSCRIPTS WITH
MDM2i
238183
~35% of transcripts that are upregulated in DDLPS when compared with normal controls are downregulated in response to MDM2 inhibition
These data suggest that a 1/3 of all upregulated transcripts in DDLPS are regulated by the MDM2:p53 axis
~35%
Downregulated mRNA in DDLPS Upregulated by the MDM2:p53 Axis
UPREGULATED TRANSCRIPTS WITH
MDM2i
234
DOWNREGULATED TRANSCRIPTS IN
DEDIFFERENTIATED LIPOSARCOMA
CELLS
41119
~5% of transcripts that are downregulated in DDLPS when compared with normal controls are upregulated in response to MDM2 inhibition
These data suggest that a small number of transcripts that are downregulated in DDLPS are regulated in a MDM2/p53 axis-dependent manner
~5%
Proposed signaling pathway for PTTG1 action at the G2 DNA damage checkpoint
DNA Damage
PTTG1
PTTG1
p53
Aurora A
G2 M
Cytoplasm
Nucleus
Potential miRNA Regulation of mRNA with SAR405838: ABI SOliD platform
Top 18 miRNAs differentially
expressed in 3 cell lines vs controls
MaxA > 50P < 0.05FC > 2
Top 472 genes differentially
expressed genes in 4 DDLPS cell lines
treated with SAR405838 vs DMSO controls
FC > 2P < 0.05
14 miRNAs potentially regulating 93 differentially
expressed mRNAs with SAR405838 treatment
~20%
Top Molecular Pathways Affected by miRNAs in DDLPS
1. Cell Cycle: G2/M DNA Damage Checkpoint
2. p53 Signaling
3. Mitotic Roles of Polo-Like Kinase 1
Summary
Gene expression arrays identified multiple targets / pathways of potential interest
Identify on and off effects, regulatory loops
Studies focus on validating specific pathway/targets