This competitive revision is in response to the Notice Number (NOT-OD-09-058) and Notice Title: NIH Announces the Availability of Recovery Act Funds for Competitive Revision Applications, for the parent grant (R01CA121105) entitled """"""""SMAC in chemoprevention of colon cancer"""""""". Since common epithelial cancers are resistant to most therapeutic treatments, much hope has been placed on prevention of cancer through the use of chemical agents or dietary manipulation. The widely used nonsteroidal antiinflammatory drugs (NSAIDs) are effective in chemoprevention of colorectal cancer, which is the second leading cause of cancer related death in the United States. However, the mechanisms underlying the anti-neoplastic effects of NSAIDs remain unclear. Substantial evidence has indicated that the chemopreventive activities of NSAIDs are mediated by induction of apoptosis. The parent project (R01CA121105) has been aimed at studying how SMAC, a mitochondrial apoptogenic protein, contributes to the anti-neoplastic effects of NSAIDs. The ongoing studies have demonstrated that SMAC plays an essential role in NSAID-induced apoptosis and NSAID-mediated chemoprevention. Agents that mimic the function of SMAC can enhance the apoptotic response to sulindac, an NSAID commonly used in chemoprevention. In this Competitive Revision application, we propose to test the hypothesis that activation of SMAC in mice can improve the chemopreventive activities of sulindac. We will create an intestine-specific SMAC transgenic mouse model and cross the SMAC transgenic mice with APCMin/+ mice, and determine if SMAC activation augments tumor phenotypes and improves the chemopreventive effects of sulindac in APCMin/+ mice through apoptosis induction. The proposed study will significantly accelerate the tempo of scientific research proposed in the parent project by providing a novel chemoprevention model and new insights into the anti-neoplastic effects of NSAIDs. In the long run, the results of these studies may help to develop improved strategies and agents for chemoprevention of colon cancer.

Public Health Relevance

Despite improvements in early detection and treatment of cancer, overall mortality rates for most cancers of epithelial origin, such as those of colon, breast, lung and prostate, have not declined. Much hope has recently been placed on prevention of human cancers through the use of chemical agents or dietary manipulation. This project seeks to determine whether activation of SMAC, a critical regulator of cancer cell death, can improve the chemopreventive effects of nonsteroidal antiinflammatory drugs (NSAIDs). The results could be useful for developing improved strategies and novel agents for better chemoprevention of human cancer.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
3R01CA121105-03S1
Application #
7811113
Study Section
Special Emphasis Panel (ZRG1-OTC-N (95))
Program Officer
Perloff, Marjorie
Project Start
2009-09-30
Project End
2011-09-29
Budget Start
2009-09-30
Budget End
2011-09-29
Support Year
3
Fiscal Year
2009
Total Cost
$197,708
Indirect Cost
Name
University of Pittsburgh
Department
Pharmacology
Type
Schools of Medicine
DUNS #
004514360
City
Pittsburgh
State
PA
Country
United States
Zip Code
15213
Tong, Jingshan; Wang, Peng; Tan, Shuai et al. (2017) Mcl-1 Degradation Is Required for Targeted Therapeutics to Eradicate Colon Cancer Cells. Cancer Res 77:2512-2521
He, K; Zheng, X; Li, M et al. (2016) mTOR inhibitors induce apoptosis in colon cancer cells via CHOP-dependent DR5 induction on 4E-BP1 dephosphorylation. Oncogene 35:148-57
Chen, Xiaojun; Song, Xiaomeng; Yue, Wen et al. (2015) Fibulin-5 inhibits Wnt/?-catenin signaling in lung cancer. Oncotarget 6:15022-34
Brown, M F; Leibowitz, B J; Chen, D et al. (2015) Loss of caspase-3 sensitizes colon cancer cells to genotoxic stress via RIP1-dependent necrosis. Cell Death Dis 6:e1729
Wang, Xinwei; Wei, Liang; Cramer, Julie M et al. (2015) Pharmacologically blocking p53-dependent apoptosis protects intestinal stem cells and mice from radiation. Sci Rep 5:8566
Leibowitz, Brian; Qiu, Wei; Buchanan, Monica E et al. (2014) BID mediates selective killing of APC-deficient cells in intestinal tumor suppression by nonsteroidal antiinflammatory drugs. Proc Natl Acad Sci U S A 111:16520-5
Sun, Jing; Knickelbein, Kyle; He, Kan et al. (2014) Aurora kinase inhibition induces PUMA via NF-?B to kill colon cancer cells. Mol Cancer Ther 13:1298-308
Chen, Dongshi; Ming, Lihua; Zou, Fangdong et al. (2014) TAp73 promotes cell survival upon genotoxic stress by inhibiting p53 activity. Oncotarget 5:8107-22
Kim, Seog-Young; Song, Xinxin; Zhang, Lin et al. (2014) Role of Bcl-xL/Beclin-1 in interplay between apoptosis and autophagy in oxaliplatin and bortezomib-induced cell death. Biochem Pharmacol 88:178-88
Chen, Dongshi; Wei, Liang; Yu, Jian et al. (2014) Regorafenib inhibits colorectal tumor growth through PUMA-mediated apoptosis. Clin Cancer Res 20:3472-84

Showing the most recent 10 out of 39 publications