We continue to test the hypothesis that the activation of PKC (a major TPA receptor) is an initial event in tumor promotion and ODC-gene transcription by the tumor promoter TPA. Thus, the continuing goals of this project are two-fold: 1. To determine the role of PKC in tumor promotion by TPA. Specifically, we plan: a) To determine the tumor promoting activity of diacylglycerols (DG) which activate PKC. We reported that, under the conditions where TPA is a complete tumor promoter, DG is a stage II tumor promoter. We will investigate the mechanism underlying differences between the tumor promoting activities of TPA and DG. b) To determine whether differences in tumor promoting susceptibility of B2S (sensitive) and B2R (resistant) strains of mice are due to differential translocation and down-regulation of PKC isozymes by TPA. c) To directly demonstrate the role of PKC in tumor promotion by TPA, we plan to use C3H10T1/2 cell line. We will transfect these cells with PKC gene expression vectors and determine whether different PKC isozyme overproducing cells are more sensitive to tumor promotion by TPA than their parental cells. 2. To determine the role of PKC in TPA-induced ODC gene transcription. We plan to: a) Transfect T24 cells with PKC gene expression vector and clone PKC overproducing transfectants to directly demonstrate the role of PKC in ODC gene expression. b) Analyze the mechanism of enhanced ODC gene transcription by TPA. In this study, we will use the 5'-flanking region of ODC gene to determine TPA-responsive enhancer elements, isolate trans- acting factors (proteins) and determine whether the trans-acting factors are substrates for PKC which may increase in vitro transcription of ODC gene. c) Analyze the relation of PKC down regulation to superinduction of ODC activity after repeated TPA applications to mouse skin. This study will permit an evaluation of the role of PKC in ODC gene transcription and tumor promotion by TPA.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA035368-09
Application #
3172959
Study Section
Chemical Pathology Study Section (CPA)
Project Start
1983-07-01
Project End
1995-02-28
Budget Start
1992-03-01
Budget End
1993-02-28
Support Year
9
Fiscal Year
1992
Total Cost
Indirect Cost
Name
University of Wisconsin Madison
Department
Type
Schools of Medicine
DUNS #
161202122
City
Madison
State
WI
Country
United States
Zip Code
53715
Hafeez, Bilal Bin; Meske, Louise; Singh, Ashok et al. (2016) Tissue-specific conditional PKC? knockout mice: a model to precisely reveal PKC? functional role in initiation, promotion and progression of cancer. Oncotarget 7:33069-80
Singh, Anupama; Singh, Ashok; Sand, Jordan M et al. (2015) Topically applied Hsp90 inhibitor 17AAG inhibits UVR-induced cutaneous squamous cell carcinomas. J Invest Dermatol 135:1098-1107
Hafeez, Bilal Bin; Jamal, Mohammad Sarwar; Fischer, Joseph W et al. (2012) Plumbagin, a plant derived natural agent inhibits the growth of pancreatic cancer cells in in vitro and in vivo via targeting EGFR, Stat3 and NF-?B signaling pathways. Int J Cancer 131:2175-86
Sand, Jordan M; Bin Hafeez, Bilal; Jamal, Mohammad Sarwar et al. (2012) Plumbagin (5-hydroxy-2-methyl-1,4-naphthoquinone), isolated from Plumbago zeylanica, inhibits ultraviolet radiation-induced development of squamous cell carcinomas. Carcinogenesis 33:184-90
Sand, Jordan Marshall; Bin Hafeez, Bilal; Aziz, Moammir Hasan et al. (2012) Ultraviolet radiation and 12-O-tetradecanoylphorbol-13-acetate-induced interaction of mouse epidermal protein kinase Cýý with Stat3 involve integration with ERK1/2. Mol Carcinog 51:291-302
Hafeez, Bilal Bin; Zhong, Weixiong; Weichert, Jamey et al. (2011) Genetic ablation of PKC epsilon inhibits prostate cancer development and metastasis in transgenic mouse model of prostate adenocarcinoma. Cancer Res 71:2318-27
Aziz, M H; Hafeez, B B; Sand, J M et al. (2010) Protein kinase Cvarepsilon mediates Stat3Ser727 phosphorylation, Stat3-regulated gene expression, and cell invasion in various human cancer cell lines through integration with MAPK cascade (RAF-1, MEK1/2, and ERK1/2). Oncogene 29:3100-9
Sand, Jordan M; Aziz, Moammir H; Dreckschmidt, Nancy E et al. (2010) PKCepsilon overexpression, irrespective of genetic background, sensitizes skin to UVR-induced development of squamous-cell carcinomas. J Invest Dermatol 130:270-7
Aziz, Moammir Hasan; Sundling, Kaitlin Elizabeth; Dreckschmidt, Nancy Ellen et al. (2009) Protein kinase Cepsilon inhibits UVR-induced expression of FADD, an adaptor protein, linked to both Fas- and TNFR1-mediated apoptosis. J Invest Dermatol 129:2011-21
Aziz, Moammir H; Dreckschmidt, Nancy E; Verma, Ajit K (2008) Plumbagin, a medicinal plant-derived naphthoquinone, is a novel inhibitor of the growth and invasion of hormone-refractory prostate cancer. Cancer Res 68:9024-32

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