Targeting Kinases Critical for TMPRSS2-ERG Function in Prostate Cancer
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1 Targeting Kinases Critical for TMPRSS2-ERG Function in Prostate Cancer Kyle Nakatsuka David Takeda, MD, PhD Lab of William Hahn, M.D., Ph.D. Broad Institute Summer Research Program in Genomics
2 TMPRSS2-ERG in Prostate Cancer TMPRSS2-ERG translocation causes ERG overexpression Expressed in 50% of prostate cancers Invasion, proliferation, survival Targets for prostate cancer therapy
3 Kinase Screen Identifies Potential ERG Modulators Kinase Inhibition High-throughput screen identifies 40 kinases likely to affect ERG Potential upstream modulators of ERG Mechanisms unknown Several are targets of existing kinase-inhibiting drugs
4 Methods Kinase Inhibition Drug treatment ERG protein expression ERG mrna expression Downstream target effects Viability phenotype
5 PP242 mtor Inhibition Reduces ERG Protein Expression Kinase Inhibition Control PP242 JX401 DMSO 0.1uM 1uM 10uM 1uM 10uM 50uM Reduced protein expression with mtor inhibition by PP242 No significant change in protein expression with other drugs
6 Downstream ERG Targets ARHGDIB mrna Expression 1.2 PLA1A mrna Expression Fold Change kk control pp242 1uM pp242 10uM Treatment Fold Change control pp242 1uM pp242 10uM Treatment
7 PP242 mtor inhibition downregulates ERG downstream target transcription Kinase Inhibition ARHGDIB mrna Expression Fold Change control pp242 1uM pp242 10uM Treatment PLA1A mrna Expression Fold Change control pp242 1uM pp242 10uM Treatment
8 PP242 mtor Inhibition Reduces ERG mrna Expression Kinase Inhibition 2.5 mtor Inhibition and ERG mrna Expression 2 Fold Change control pp242 1uM pp242 10uM Treatment
9 mtor Inhibition Reduces Downstream ERG Target Expression mtor Inhibition and ERG mrna Expression Fold Change control pp242 1 pp Treatment ARHGDIB mrna Expression Downstream ERG Targets 1.2 PLA1A mrna Expression Fold Change Fold Change control pp242 1uM pp242 10uM Treatment 0 control pp242 1uM pp242 10uM Treatment
10 Viability Phenotype Kinase Inhibition Viability (% of initial) PP log(drug concentration) Viability (% of initial) Torin log(drug concentration)
11 Conclusions mtor inhibition reduces ERG protein levels, increases ERG transcription Post-transcriptional ERG modification mtor is an upstream regulator of ERG Potential therapeutic target for ERG overexpressing tumors
12 Future Directions Determine other phenotypic effects Invasion, serum deprivation Confirm result in other mtor inhibitor drugs Mechanism Apply to other transcription factors
13 Acknowledgements Hahn Lab David Takeda William Kim Xiaoxing Wang Diane Shao Elizabeth Dwinell Elsa Beyer Mik Rinne Leo Yao Luo Yaara Zwang William Hahn SRPG Program Bruce Birren Eboney Smith Francie Latour SRPG Students
14 Questions?
15 Results Cell treatment by various kinase inhibitor drugs Viability by cell titer-glo ATP assay ERG protein expression by Western Blot ERG mrna expression by qrt-pcr Downstream target mrna Expression Mechanism, other mtor inhibitors, etc. Toxicity by kinase inhibition is not specific to ERG PP242 mtor inhibition downregulates ERG protein expression PP242 mtor inhibition upregulates ERG mrna expression PP242 mtor inhibition downregulates ERG downstream target transcription
16 Methods Kinase Inhibition Drug treatment ERG protein expression ERG mrna expression Downstream target effects Viability phenotype
17 Methods Kinase Inhibition Drug treatment ERG protein expression ERG mrna expression Downstream target effects Viability phenotype
18 Methods Kinase Inhibition Drug treatment ERG protein expression ERG mrna expression Downstream target effects Viability phenotype
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22 Methods HT kinase screen identifies 40 ERG modulators Cell treatment by various kinase inhibitor drugs ERG protein expression by Western Blot ERG mrna expression by qrt-pcr Downstream target mrna Expression Mechanism, other mtor inhibitors, etc. Viability by cell titer-glo ATP assay
23 Methods Drug treatment ERG protein expression ERG mrna expression Downstream target effects Viability phenotype
24 Methods HT kinase screen identifies 40 ERG modulators
25 Methods HT kinase screen identifies 40 ERG modulators Cell treatment by various kinase inhibitor drugs
26 Methods HT kinase screen identifies 40 ERG modulators Cell treatment by various kinase inhibitor drugs Viability by cell titer-glo ATP assay
27 Methods HT kinase screen identifies 40 ERG modulators Cell treatment by various kinase inhibitor drugs Viability by cell titer-glo ATP assay ERG protein expression by Western Blot
28 Methods HT kinase screen identifies 40 ERG modulators Cell treatment by various kinase inhibitor drugs Viability by cell titer-glo ATP assay ERG protein expression by Western Blot ERG mrna expression by qrt-pcr
29 Methods HT kinase screen identifies 40 ERG modulators Cell treatment by various kinase inhibitor drugs Viability by cell titer-glo ATP assay ERG protein expression by Western Blot ERG mrna expression by qrt-pcr Downstream target mrna Expression
30 Methods Hypothesis: If the kinases identified by the shrna screen are involved in the ERG pathway, then their inhibition by drugs will reduce downstream signaling and phenotype
31 Kinase Inhibition and Viabilty IC50 Across Cell types LNCaP VCaP (ERG) PC3 BIX Olaparib JX SB PP Torin nilotnib BX
32 Kinase Inhibition and Viabilty IC50 Across Cell types LNCaP VCaP (ERG) PC3 BIX Olaparib JX SB PP Torin nilotnib BX Kinase inhibition viability phenotype (toxicity) not specific to ERG
33 Kinase Inhibition and Viabilty Kinase inhibition viability phenotype (toxicity) not specific to ERG LNCaP VCaP PC3 BIX Olaparib JX SB PP Torin nilotnib BX
34 Results Cell treatment by various kinase inhibitor drugs Viability by cell titer-glo ATP assay ERG protein expression by Western Blot ERG mrna expression by qrt-pcr Downstream target mrna Expression Mechanism, other mtor inhibitors, etc. Toxicity by kinase inhibition is not specific to ERG
35 Results Reduced protein expression at 12, 24 hours
36 Results Reduced protein expression at 12, 24 hours
37 Results Reduced protein expression at 12, 24 hours Quantification? Incluir todo con actin?
38 Results Cell treatment by various kinase inhibitor drugs Viability by cell titer-glo ATP assay ERG protein expression by Western Blot ERG mrna expression by qrt-pcr Downstream target mrna Expression Mechanism, other mtor inhibitors, etc. Toxicity by kinase inhibition is not specific to ERG PP242 mtor inhibition downregulates ERG protein expression
39 PP242 Increases ERG Transcription Kinase Inhibition and ERG mrna Expression Percent Change (%) bix 10 bix 50 jx jx pp242 1 pp SB 10 SB Treatment Drug Inhibits PP242 mtor Measured Effect Increased ERG mrna levels
40 Results Cell treatment by various kinase inhibitor drugs Viability by cell titer-glo ATP assay ERG protein expression by Western Blot ERG mrna expression by qrt-pcr Downstream target mrna Expression Mechanism, other mtor inhibitors, etc. Toxicity by kinase inhibition is not specific to ERG PP242 mtor inhibition downregulates ERG protein expression PP242 mtor inhibition upregulates ERG mrna expression
41 Kinase Inhibition and ERG Target Transcription PLA1A and ARGHD1B are downstream targets of ERG Kinase Inhibition and ARGHDIB Transcription Kinase Inhibition and PLA1A Transcription Percent Change (%) bix 10uM bix 50uM pp242 1uM pp242 10uM jx401 10uM Treatment jx401 50uM SB 10uM SB 50uM Percent Change (%) bix 10 bix 50 jx jx pp242 1 Treatment pp SB 10 SB 50 Drug Inhibits Measured Effect PP242 mtor Reduced ERG target mrna BIX MEK Increased ERG target mrna
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