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Differential Splicing of Oncogenes and Tumor Suppressor Genes in African- and Caucasian-American Populations: Contributing Factor in Prostate Cancer Disparities

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Technical Report,30 Sep 2014,29 Sep 2015

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George Washington University Washington United States

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The overarching goal of this grant award is to characterize differential splicing of oncongenes and tumor suppressor genes in prostate cancer disparities between African American AA and Caucasian American CA prostate cancer PCa. In year 1 of this award, we have focused our efforts on two oncogenes, phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit delta PIK3CD and fibroblast growth factor receptor 3 FGFR3, undergoing population-dependent differential splicing where the AA-specific variants are engendered with a more aggressive oncogenic phenotype in vitro and in vivo. Full-length cloning of the AA and CA variants of both PIK3CD andFGFR3 have been accomplished. PCa cell lines genetically manipulated to predominantly express the AA-variant of PIK3CD or FGFR3exhibit greater proliferative and invasive capacity. Detailed analysis of PCa cell lines over-expressing the AA-variant of PIK3CD revealed enhanced activation of the PI3KAKT pathway compared to the same lines over-expressing the CA-variant. Moreover, proliferative capacity of the CA-variant lines was sensitive to inhibition by CAL-101, a small molecule inhibitor designed specifically against PIK3CD.In contrast, proliferative capacity of the AA-variant lines was resistant to CAL-101 inhibition. And these findings CA variants sensitive and AA variants insensitive to CAL-101 were recapitulated in a xenograft mouse model of proliferation. We are currently testing a xenograft mouse model of metastasis. Year 2 will focus on in vitro and in vivo characterization of the AA and CA variants of FGFR3.

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