juliane carvalho cancer biology presentation
DESCRIPTION
Recent publication showing an interesting approach to identify potential cancer cells and related cell signalling inhibitors in development of anticancer drugs.TRANSCRIPT
Genomic Alterations of Anaplastic Lymphoma Kinase May Sensitize Tumors to Anaplastic Lymphoma Kinase Inhibitors
McDermott et. al. Cancer Research. 2008; 68 (9) 3389-3395
Juliane Carvalho
Johns Hopkins University
Cancer Biology: AS410_638_81_SP10
Prof: Elena Tilli Shiffert, PhD.
Online presentation: February 16, 2009
Outline
Kinase inhibitors use in medical oncology Research platform using human tumor cell lines against molecular
inhibitors. Selective Anaplastic Lymphoma Kinase (ALK) inhibitor and identification
of genotype associated responses Correlation of specific oncogene rearrangement and sensitivity to
inhibitor treatment Specific genetic alterations and potential use of it as markers for the
development specific pharmacological cancer inhibitors of clinical significance
Anaplastic Lymphoma Kinase (ALK) ALK is a receptor tyrosine kinase,
originally identified as a member of the insulin receptor subfamily of receptor tyrosine kinases (RTKs).
Natural ligands: PTN (Pleiotrophin) and MK (Midkine)
ALK is restricted normal tissue distribution in adult human tissue mainly in the neural cells, pericytes and endothelial of the brain
Known for its potential oncogenic capability when chromosome rearrangements occur Biochemical Journal (2009) Volume 420, 345-361
ALK cont’d ALK gene alterations causing diseases:
Translocation: non-small-cell lung cancer and anaplastic large cell lymphomas
Gene amplification or point mutations: neuroblastomas
Approximately 50–60% of cases of Anaplastic Large Cell Lymphoma (ALCL) are associated with the t(2;5;)(p23;q35) chromosomal translocation, which generates a hybrid gene consisting of the intracellular domain of the ALK tyrosine kinase receptor juxtaposed with NPM (nucleophosmin): fusion partner.
Commonly observed is translocation: generation of fusion proteins increase constitutive activation of ALK: transformation > cancer
A group of human cells lines harboring ALK gene alteration are highly sensitive to ALK inhibitors
Materials and Methods Human cancer cell lines
Commercially available, automated platform maintenance system, tested for cell viability Kinase inhibitors
TAE684, BMS-536924, PF-2341066 and WZ-5-126 (small molecule inhibitors) Protein detection
Immunoassay and SDS-PAGE Antibodies:
Akt, ALK, Erk1-2 kinase, phospho-Erk1/2 (T202/Y204), phospho-ALK, STAT3 and phospho-STAT3 antibodies and poly (ADP ribose) polymerase antibody
Cell cycle analysis Used anti-BrdUrd monoclonal antibody > FITC-conjugated anti-mouse IgG > propidium iodide > RNase A: two
dimensional fluorescence cell sorting analysis RNA interference
2 shRNA targeting sequences downstream of ALK breakpoint, expressed from lentiviral vector to infect cells Fluorescence in situ hybridization (FISH)
LSI ALK Dual Color, Break Apart Rearrangement Probe. (manufacturer protocol) Polymerase Chain Reaction (PCR) detection of ALK fusion products
RNA extraction, reverse-transcription and PCR : Detection of ALK fusion products (manufacturer protocol) DNA sequencing
Genomic DNA isolated. ALK gene amplicons (exons 1-29) amplified, PCR products purified and sequenced.
Figure 1. A, pie chart representation of the sensitivity of 602 human cancer cell lines to treatment with 200 nmol/L TAE684
Copyright ©2008 American Association for Cancer Research
McDermott, U. et al. Cancer Res 2008;68:3389-3395
Copyright ©2008 American Association for Cancer Research
McDermott, U. et al. Cancer Res 2008;68:3389-3395
Figure 2. A, FISH analysis of the BE(2)-C, KELLY, and NB-1 neuroblastoma cell lines using the LSI ALK Dual Color, Break Apart Rearrangement Probe
Copyright ©2008 American Association for Cancer Research
McDermott, U. et al. Cancer Res 2008;68:3389-3395
Figure 3. A, pie chart representation of the sensitivity of 256 human cancer cell lines to 200 nmol/L of the IGF-IR inhibitor BMS-536924 following 72 h of treatment
Copyright ©2008 American Association for Cancer Research
McDermott, U. et al. Cancer Res 2008;68:3389-3395
Figure 4. A, dose-response curves showing the effect of the ALK inhibitor TAE684 and the MET/ALK inhibitor PF-2341066 on cell viability 72 h after treatment in the SU-DHL-1
and Karpas-299 lymphoma cell lines and the NB-1 neuroblastoma cell line
Conclusions ALK inhibition profile is similar across susceptible tumor cell lines and shows identical effect in downstream signal
transduction effectors
Differential response to inhibitors seems to reflect differences in genetic background or predisposition acquired by cells
This research approach is a valuable strategy for evaluation of molecules that may play important role in pharmacological clinical response in cancer patients
Fusion proteins generated by genetic translocations can potentially be used as diagnostic markers in human cancer cells. But more work is needed to clarify its specific roles since fusion proteins may have normal functional properties in non tumor cells
The ALK genomic status is strong, but may not be the sole determinant of sensitivity to kinase inhibition. Genomic status of ALK must be studied in additional tumor cells sensitive to inhibitors other than TAE684
More research should be done using ALK si-RNA targeting ALK-fusion protein transcripts as potential therapeutic targets
DNA vaccine against human ALK: possible prevention/therapy alternative. Animals challenged with ALK-expressing lymphoma cells showed protection against the disease. Specific genotypes and immunological response must be considered.
Therapies for complete inhibition of ALK need to consider potential side effects in different animal developmental stages. Particular study may not be feasible in pregnant women
Future research (?) use of in vivo cancer cells in mice. Evaluate drug response against tumor grafts to predict clinical efficacy. Explore the combination of downstream effector inhibitors.
Questions
Literature consulted McDermott, et. al. (2008). Genomic Alterations of Anaplastic Lymphoma Kinase May Sensitize Tumors to
Anaplastic Lymphoma Kinase Inhibitors. Cancer Research. 68: (9).3389-3395.
Palmer, et. al. (2009). Anaplastic Lymphoma Kinase: Signaling in Development and Disease. Biochemical Journal. 420, 345-361.
Webb, T. et al. (2009). Anaplastic Lymphoma Kinase: Role in Cancer Pathogenesis and Small-molecule Inhibitor Development for Therapy. Expert Rev Anticancer Ther. Volume: 9, Issue: 3, Date: 2009 Mar , Pages: 331-56, 9(3), 331-356.
Chiarle, R. et. al. (2008). The Anaplastic Lymphoma Kinase is an effective oncoantigen for lymphoma vaccination. Nature Medicine 14, 676-680.
Stoica, G. E. et. al. (2001). Identification of Anaplastic Lymphoma Kinase as a Receptor for the Growth Factor Pleiotrophin. Journal of Biological Chemistry. Vol. 276, No 20, pp. 16772-16779.
Galkin A.V., et. al. (2007). Identification of NVP-TAE684, a potent, selective, and efficacious inhibitor of NPM-ALK. PNAS. 104: 270-5.
Weinberg, The Biology of Cancer . Chapter 4. 2007 by Garland Science, Taylor & Francis Group, LLC.