The recent advances in our understanding of the role of aberrant signal transduction in the development of cancer provide an exciting opportunity for the discovery and development of new anti-tumor drugs. One of the few constriction points though which much cellular information flows is protein kinase C (PKC). The central position of this enzyme in cellular signal transduction as it is presently understood and the evidence from experiments with currently available activators and inhibitors of PKC indicate that modulation of PKC is a reasonable target for drug development. This project will take advantage of well established methods for the assay of modulation of PKC and the high affinity and novelty resulting from the structural complexity often associated with natural products, to discover and isolate natural products that modulate PKC. A better understanding of the basis of the biological and biochemical outcome of modulation of PKC will be useful for determining the feasibility and improving the efficiency of further drug discovery and development. To gain such understanding, it is necessary to investigate the structure-activity relationship of modulating agents both by semi-synthesis of novel and known modulatory agents and by correlation of the biochemical mechanism and selectivity of action with the biological efficacy. The latter will be determined by testing cytotoxicity of human tumor cell lines in vitro and in the nude mouse xenograft assay. While no single approach to drug discovery is guaranteed to be successful, this proposal has attempted to maximize the chances of success by carefully planning the approach cognizant of the information currently available and by keeping the approach flexible to take advantage of new information about the role of PKC in signal transduction and the role of signal transduction in the development and maintenance of the cancer cell phenotype.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project--Cooperative Agreements (U01)
Project #
5U01CA052995-02
Application #
3808243
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
2
Fiscal Year
1991
Total Cost
Indirect Cost
Name
Mayo Clinic, Rochester
Department
Type
DUNS #
City
Rochester
State
MN
Country
United States
Zip Code
55905
Ihle, N T; Powis, G; Kopetz, S (2011) PI-3-Kinase inhibitors in colorectal cancer. Curr Cancer Drug Targets 11:190-8
Liu, Enbo; Knutzen, Christine A; Krauss, Sybille et al. (2011) Control of mTORC1 signaling by the Opitz syndrome protein MID1. Proc Natl Acad Sci U S A 108:8680-5
Gwak, Ho-Shin; Shingu, Takashi; Chumbalkar, Vaibhav et al. (2011) Combined action of the dinuclear platinum compound BBR3610 with the PI3-K inhibitor PX-866 in glioblastoma. Int J Cancer 128:787-96
Leone, Marilisa; Barile, Elisa; Vazquez, Jesus et al. (2010) NMR-based design and evaluation of novel bidentate inhibitors of the protein tyrosine phosphatase YopH. Chem Biol Drug Des 76:10-6
Ihle, Nathan T; Powis, Garth (2010) The biological effects of isoform-specific PI3-kinase inhibition. Curr Opin Drug Discov Devel 13:41-9
Koul, Dimpy; Shen, Ruijun; Kim, Yong-Wan et al. (2010) Cellular and in vivo activity of a novel PI3K inhibitor, PX-866, against human glioblastoma. Neuro Oncol 12:559-69
Ihle, Nathan T; Powis, Garth (2010) Inhibitors of phosphatidylinositol-3-kinase in cancer therapy. Mol Aspects Med 31:135-44
Gaitonde, Supriya; De, Surya K; Tcherpakov, Marianna et al. (2009) BI-69A11-mediated inhibition of AKT leads to effective regression of xenograft melanoma. Pigment Cell Melanoma Res 22:187-95
Ihle, Nathan T; Lemos, Robert; Schwartz, David et al. (2009) Peroxisome proliferator-activated receptor gamma agonist pioglitazone prevents the hyperglycemia caused by phosphatidylinositol 3-kinase pathway inhibition by PX-866 without affecting antitumor activity. Mol Cancer Ther 8:94-100
Ihle, Nathan T; Lemos Jr, Robert; Wipf, Peter et al. (2009) Mutations in the phosphatidylinositol-3-kinase pathway predict for antitumor activity of the inhibitor PX-866 whereas oncogenic Ras is a dominant predictor for resistance. Cancer Res 69:143-50

Showing the most recent 10 out of 14 publications