Stromal AR Roles in Prostate Hyperplasia and Cancer

描述（由申请人提供）：研究表明，在人类和啮齿动物中，正常的前列腺发育、良性前列腺增生（BPH）和前列腺癌的发展都需要雄激素/雄激素受体（AR）信号。前列腺有上皮细胞和基质细胞两种类型，它们构成前列腺的结构并介导前列腺的生理功能。AR在上皮细胞和基质细胞中的表达可能在控制前列腺生长的稳态中起重要作用。我们最近的数据表明，双基质-cre ARKO （d-ARKO）小鼠前列腺的基质AR功能显著降低，并影响前列腺上皮细胞的稳态。我们推测基质细胞中的AR可能在良性前列腺增生（BPH）和癌变中起着不同的作用。我们之所以想比较基质AR在前列腺增生和癌症中的作用，是因为它将使我们更深入地了解基质AR如何在老年男性中对这两种最常见的前列腺疾病的病因和进展做出不同的贡献。在前列腺领域，尽管有可用的体外细胞系或组织重组系统来研究基质AR在正常前列腺发育中的作用，但肾捕获重组系统是在没有适当前列腺微环境的免疫缺陷小鼠中生长的，只能在4-7周内进行研究。因此，缺乏长期的体内模型来研究间质AR对前列腺增生和前列腺癌的影响。到目前为止，还没有合适的临床前小鼠模型来研究间质AR功能。我们建议生成双re- arko (d-ARKO)，以了解基质AR在BPH发展和癌变中的作用。将追求三个具体目标。目的1。通过将基质d-ARKO小鼠与泌乳素转基因小鼠杂交，研究基质AR在前列腺增生中的作用。目标2。间质成纤维细胞/平滑肌选择性双cre AR敲除（d-ARKO）小鼠模型的建立及前列腺肿瘤发生和肿瘤进展的研究。目标3。研究BPH和前列腺癌发生过程中基质AR影响上皮的靶基因及分子机制。该项目的完成将有助于我们深入了解基质AR在前列腺稳态和癌变进展中的作用，该结果也可能在未来为BPH和前列腺癌开发新的替代治疗方法。

DESCRIPTION (provided by applicant): It has been suggested that normal prostate development, benign prostate hyperplasia (BPH), and prostate cancer development all require androgen/androgen receptor (AR) signaling in human and rodent. There are two types of cells, epithelial and stromal cells, constituting the prostate gland structure and mediating the physiological functions. The expression of AR in both epithelial and stromal cells may play important roles in controlling the homeostasis of prostate growth. Our recent data suggested that double stromal-cre ARKO (d-ARKO) mouse prostates have a profoundly reduced stromal AR function and impact on the homeostasis of prostate epithelial cells. We hypothesize that the AR in the stromal cells could play differential roles in benign prostate hyperplasia (BPH) and carcinogenesis. The reason we would like to compare stromal AR role in the BPH vs. cancer is that it will lead to more insights how stromal AR may differentially contribute to the etiology and progression of these two most commen prostate diseases in elder men. In the prostate field, even though there are available in vitro cell lines or tissue recombinant system to study stromal AR roles in normal prostate development, the kidney capture recombination system is grown in immune deficient mice without proper prostate microenvironment and can be only studied in 4-7 weeks. Therefore there is a lack of long-term in vivo model to investigate stromal AR impact on the BPH and prostate carcinogenesis. To date, there are still no suitable preclinical mouse models to study the stromal AR function. We propose to generate the double cre-ARKO (d-ARKO) for understanding the stromal AR role in development of BPH and carcinogenesis. Three Specific Aims will be pursued. Aim 1. To study the stromal AR role in BPH by crossing stromal d-ARKO mice with prolactin transgenic mice. Aim 2. Generation of mouse models with stromal-fibroblast/smooth muscle selective double-cre AR knockout (d-ARKO) and investigation of prostate tumorigenesis and tumor progression. Aim 3. Studying target gene and molecular mechanisms of stromal AR that could affect the epithelium during development of BPH and the prostate cancer. The accomplishment of the project will help us gain insights on the role of stromal AR in the prostate homeostasis and cancerous transformation and progression, and the results could also lead to developing new alternative treatments for BPH and prostate cancer in the future.