Presentation is loading. Please wait.

Presentation is loading. Please wait.

INTEGRATED ANALYSIS OF THE MOLECULAR DEREGULATIONS OF THE MDM2:P53 AXIS IN DDLPS KATE LYNN BILL, JEANNINE GARNETT, CHAD CREIGHTON, XIAOYAN MA, ISABELLE.

Similar presentations


Presentation on theme: "INTEGRATED ANALYSIS OF THE MOLECULAR DEREGULATIONS OF THE MDM2:P53 AXIS IN DDLPS KATE LYNN BILL, JEANNINE GARNETT, CHAD CREIGHTON, XIAOYAN MA, ISABELLE."— Presentation transcript:

1 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

2 Anaya et al. Ann Surg 2009; 16(3) Lahat et al. Ann Surg Oncol 2008; 15(6): WDLPS DDLPS WDLPS DDLPS Local recurrenceDisease specific survival DDLPS: marked propensity for local recurrence and dismal outcome

3 Disclosures Provided drug (SAR405838) for studies under MTA Sanofi reviewed this presentation – no significant changes Referred to as “inhibitor” in this talk

4 MDM2/p53 axis Wang, S. et al., Pharm Taxicol, 2009.

5 MDM2 amplifications in Cancer Tumor type MDM2 amplification (n a ) (%) Brain tumors6.7 (239) Astrocytomas8.1 (37) Glioblastomas6.8 (191) Medulloblastomas0 (8) Other0 (3) Breast carcinomas5.9 (1774) Cervical carcinomas1.1 (88) Esophageal carcinomas13 (96) Leukemias/lymphomas0 (304) Hepatoblastomas0 (38) Lung5.7 (88) Lung cancers (NSCLC)6.0 (83) Lung (not specified)0 (5) Nasopharyngeal carcinomas2.1 (46) Neuroblastoma2.0 (51) Osteosarcomas16 (207) Ovarian carcinomas3.1 (190) Pancreatic carcinomas0 (25) Soft tissue tumors20 (479) Ewing’s sarcomas10 (30) Leiomyosarcomas0 (46) Lipomas (benign)30 (43) Liposarcomas29 (87) Undifferentiated pleomorphic sarcoma 21 (163) Malignant Schwannomas19 (16) Sarcomas (non-specific) b 13 (85) Various c 33 (9) Testicular tumors4.6 (64) Thyroid carcinomas0 (22) Urothelial carcinomas2.2 (137) Wilms’ tumors0 (40) Momand, J. et al., Nucleic Acids Research, 1998.

6 MDM2: potential target for cancer therapy Small molecule inhibitors: Nutlin RG7112 SAR Wang, S. et al., Pharm Taxicol, 2009.

7 MDM2 Inhibitor: SAR  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 MW: (Formerly: SAR or MI-77301)

8 MDM2 Amplification and Overexpression in DDLPS PA A SW872 PLS-1 DDLPSS MDM2 β -actin gDNARNA * * * *

9 Systematic characterization of DDLPS cell lines  4 DDLPS cell lines were treated with SAR Proteomics mRNA miRNA DNA copy number variation* DNA Sequencing* *Previously reported data

10 Experimental Outline two independent biological replicates cell lines were either treated with 0.003% DMSO, 1 µM or 3 µM SAR (24hrs) Analysis for differential gene expression/miRNA array

11 Differential Gene Expression with SAR Treatment Pathway/process enrichment p53 regulated targets 12q13~15 amplified targets

12 >2 fold upregulated or downregulated genes in at least 3 cell lines Top Deregulated Pathways: Ingenuity Pathway Analysis P53 signaling / Cell cycle / DNA damage

13 Upregulated mRNA in DDLPS Downregulated by the MDM2:p53 Axis UPREGULATED TRANSCRIPTS IN DEDIFFERENTIATED LIPOSARCOMA CELLS 523 DOWNREGULATED TRANSCRIPTS WITH MDM2i  ~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%

14 Downregulated mRNA in DDLPS Upregulated by the MDM2:p53 Axis UPREGULATED TRANSCRIPTS WITH MDM2i 234 DOWNREGULATED TRANSCRIPTS IN DEDIFFERENTIATED LIPOSARCOMA CELLS  ~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%

15 p53 and Mitotic Pathway Connections SAR SAR uM Aurora A PTTG Actin

16 Proposed signaling pathway for PTTG1 action at the G2 DNA damage checkpoint DNA Damage PTTG1 p53 Aurora A G2 M Cytoplasm Nucleus

17 Top Canonical Pathways Potentially Affected by miRNAs in DDLPS

18 Potential miRNA Regulation of mRNA with SAR405838: ABI SOliD platform Top 18 miRNAs differentially expressed in 3 cell lines vs controls MaxA > 50 P < 0.05 FC > 2 Top 472 genes differentially expressed genes in 4 DDLPS cell lines treated with SAR vs DMSO controls FC > 2 P < 0.05 ~20%

19 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

20 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

21 Acknowledgements  Dina Lev  Raphael E. Pollock  Jeannine Garnett  Chad Creighton  David Pollock  Svetlana Bolshakov  XiaoYan Ma  Davis Ingram  Roman Belousov  Theresa Nguyen  Gonzalo Lopez  Danielle Braggio  Sanofi-Aventis  Isabelle Meaux  Laurent Debussche  Cedric Barriere  Amschwand Sarcoma Cancer Foundation


Download ppt "INTEGRATED ANALYSIS OF THE MOLECULAR DEREGULATIONS OF THE MDM2:P53 AXIS IN DDLPS KATE LYNN BILL, JEANNINE GARNETT, CHAD CREIGHTON, XIAOYAN MA, ISABELLE."

Similar presentations


Ads by Google