The management of prostate cancer has several major challenges. First, there are currently no effective treatments for hormone-refractory or metastatic prostate cancer. Second, there is a lack of reliable prognostic markers that would identify low/intermediate-grade prostate cancers that are likely to progress to aggressive metastatic disease. We have recently established transcription factor Stat5a/b as a critical protein for survival of human prostate cancer cells. Stat5a/b is the key signaling protein in prostate that mediates the effects of prolactin (Prl) which is a powerful mitogen and survival factor for prostate epithelium and is locally produced by both normal and malignant prostate cells. Our recent data show that transcription factor Stat5a+b is constitutively activated in human prostate cancer but not in adjacent normal epithelium, and that activation of Stat5a+b and expression of Prl protein strongly associate with high histological grade of prostate cancer. Moreover, our preliminary data suggest that Stat5a/b is involved in progression of human prostate cancer to hormone-refractory and metastatic disease. Here, we propose to mechanistically test the central hypothesis: ?As a result of elevated activity of Prl-Jak2-Stat5a/b signaling pathway in prostate cancer, activation of Stat5a/b stimulates growth and metastasis of human prostate cancer?. We propose to pursue three specific aims:1: Determine upstream mechanisms of constitutive Stat5a and/or 5b activation in human prostate cancer. 2: Determine whether active Stat5a and/or 5b inhibits homotypic adhesion of human prostate cancer cells and stimulates heterotypic adhesion, motility and invasion of prostate cancer cells, in vitro and in vivo. 3: Determine the prognostic values of Stat5a and Stat5b in human prostate cancer with disease recurrence as endpoint. At the completion of this work, we expect to have determined the mechanisms underlying constitutive activation of Stat5a/b in prostate cancer. Moreover, we expect to have established whether Stat5a/b promotes invasion and metastasis of human prostate cancer cells. Finally, we will have determined whether active Stat5a and/or Stat5b can be used as a tumor biomarker for prostate cancers that are likely to recur early. More individualized therapy may be of direct benefit to prostate cancer patients.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA113580-04
Application #
7626755
Study Section
Tumor Cell Biology Study Section (TCB)
Program Officer
Woodhouse, Elizabeth
Project Start
2006-08-18
Project End
2011-06-30
Budget Start
2009-07-01
Budget End
2010-06-30
Support Year
4
Fiscal Year
2009
Total Cost
$267,147
Indirect Cost
Name
Thomas Jefferson University
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
053284659
City
Philadelphia
State
PA
Country
United States
Zip Code
19107
Maranto, Cristina; Udhane, Vindhya; Hoang, David T et al. (2018) STAT5A/B Blockade Sensitizes Prostate Cancer to Radiation through Inhibition of RAD51 and DNA Repair. Clin Cancer Res 24:1917-1931
Hurrell, Sarah L; McGarry, Sean D; Kaczmarowski, Amy et al. (2018) Optimized b-value selection for the discrimination of prostate cancer grades, including the cribriform pattern, using diffusion weighted imaging. J Med Imaging (Bellingham) 5:011004
McGarry, Sean D; Hurrell, Sarah L; Iczkowski, Kenneth A et al. (2018) Radio-pathomic Maps of Epithelium and Lumen Density Predict the Location of High-Grade Prostate Cancer. Int J Radiat Oncol Biol Phys 101:1179-1187
Hoang, David T; Iczkowski, Kenneth A; Kilari, Deepak et al. (2017) Androgen receptor-dependent and -independent mechanisms driving prostate cancer progression: Opportunities for therapeutic targeting from multiple angles. Oncotarget 8:3724-3745
Li, Guangyuan; Hayward, Isaac N; Jenkins, Brittany R et al. (2016) Peptidylarginine Deiminase 3 (PAD3) Is Upregulated by Prolactin Stimulation of CID-9 Cells and Expressed in the Lactating Mouse Mammary Gland. PLoS One 11:e0147503
Wang, Yuan; Lieberman, Rachel; Pan, Jing et al. (2016) miR-375 induces docetaxel resistance in prostate cancer by targeting SEC23A and YAP1. Mol Cancer 15:70
Singh, Amrita; Fedele, Carmine; Lu, Huimin et al. (2016) Exosome-mediated Transfer of ?v?3 Integrin from Tumorigenic to Nontumorigenic Cells Promotes a Migratory Phenotype. Mol Cancer Res 14:1136-1146
Liao, Zhiyong; Gu, Lei; Vergalli, Jenny et al. (2015) Structure-Based Screen Identifies a Potent Small Molecule Inhibitor of Stat5a/b with Therapeutic Potential for Prostate Cancer and Chronic Myeloid Leukemia. Mol Cancer Ther 14:1777-93
Talati, Pooja G; Gu, Lei; Ellsworth, Elyse M et al. (2015) Jak2-Stat5a/b Signaling Induces Epithelial-to-Mesenchymal Transition and Stem-Like Cell Properties in Prostate Cancer. Am J Pathol 185:2505-22
Hoang, David T; Gu, Lei; Liao, Zhiyong et al. (2015) Inhibition of Stat5a/b Enhances Proteasomal Degradation of Androgen Receptor Liganded by Antiandrogens in Prostate Cancer. Mol Cancer Ther 14:713-26

Showing the most recent 10 out of 30 publications