Cellular Senescence in the Pathogenesis of Benign Prostatic Hyperplasia

良性前列腺增生发病机制中的细胞衰老

• 批准号: 8046455
• 负责人: Michael M Ittmann
• 金额: $ 22.91万
• 依托单位: BAYLOR COLLEGE OF MEDICINE
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-03-24 至 2013-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8046455
• 关键词: Age; Aging; Anatomy; Benign Prostatic Hypertrophy; Biological; Biological Models; Cell Aging; Cell Cycle; Cells; Development; Disease; Epithelial; Epithelial Cells; Evaluation; FGF2 gene; FGF7 gene; Functional disorder; Galactosidase; Goals; Growth; Growth Factor; Health; Hepatocyte Growth Factor; Human; Hyperplasia; IL8 gene; In Vitro; Insulin-Like Growth Factor II; Interleukin-1; Lead; Life; Light; Medical; Modeling; Morbidity - disease rate; Operative Surgical Procedures; Pathogenesis; Pathology; Peripheral; Preventive; Process; Prostate; Prostatic; Prostatic Epithelium; Prostatic Tissue; Protein Isoforms; Proteins; Publishing; Research; Role; Secondary to; Severities; Stem Cell Factor; Stromal Cells; Testing; Time; Tissues; Transgenic Mice; Transgenic Model; Urinary tract; age related; autocrine; base; cytokine; human disease; human tissue; in vivo; men; mouse model; older men; oxidative DNA damage; paracrine; senescence; telomere

DESCRIPTION (provided by applicant): Cellular senescence limits the proliferation of human cells and can be induced by a variety of cellular alterations, both intrinsic and extrinsic. Senescent cells accumulate in human tissues, including the prostate, with increasing age. These senescent cells have altered function, including increased expression of proinflammatory cytokines that can alter the function of adjacent cells. Benign prostatic hyperplasia (BPH) is the single most common pathology of aging men. Based on our published studies we hypothesize that senescence of a subset of epithelial cells in BPH tissue leads to release of cytokines and growth factors that, through direct and indirect actions, drives increased proliferation of adjacent non-senescent epithelial cells and stromal cells and ultimately prostatic tissue growth in aging men. We propose to characterize the mechanisms by which cellular senescence can promote the development of benign prostatic hyperplasia. Two Specific Aims are proposed. In Specific Aim 1, we will examine the underlying cellular alterations leading to prostatic epithelial senescence in vitro and in vivo; determine the types of cytokines and growth factors expressed by senescent epithelial cells in vitro; evaluate whether these same proteins are expressed at increased levels in BPH tissue in vivo and quantitatively evaluate the extent to which there is coexpression of these cytokines and growth factors at the cellular level in vivo with markers of senescence, including key cell cycle regulator proteins such as p21 and p16. In Specific Aim 2 we will use primary cultures of prostatic epithelial and stromal cells, the reactive stroma model system and transgenic models to examine the biological activities of the identified cytokines/growth factors and model potential autocrine and paracrine activities of those factors that are increased in BPH in vivo. In addition, we will establish a transgenic mouse model of epithelial senescence and examine the biological impact of epithelial senescence in this mouse model. Benign prostatic hyperplasia causes considerable morbidity in older men, with up to 30% of men requiring treatment for this condition, and with more than one billion dollars spent on the medical and surgical treatment of this disease annually. These studies will make a fundamental contribution to our understanding of the role of cellular senescence in the pathogenesis of this common disease and lead to more effective preventive treatments and medical therapies. PUBLIC HEALTH RELEVANCE: Benign prostatic hyperplasia causes considerable morbidity in older men by blocking the urinary tract and up to 30% of men will require treatment for this condition at some time in their lives, with more than one billion dollars spent on the medical and surgical treatment of this disease annually. We believe these studies will make a fundamental contribution to our understanding the causes of this common disease and by doing so lead to more effective preventive treatments and medical therapies.

描述（由申请人提供）：细胞衰老限制了人类细胞的增殖，并且可以由多种细胞改变（内在和外在）诱导。随着年龄的增长，衰老细胞在包括前列腺在内的人体组织中积累。这些衰老细胞具有改变的功能，包括增加促炎细胞因子的表达，其可以改变邻近细胞的功能。良性前列腺增生（BPH）是老年男性最常见的病理。基于我们已发表的研究，我们假设BPH组织中上皮细胞亚群的衰老导致细胞因子和生长因子的释放，这些细胞因子和生长因子通过直接和间接作用驱动邻近非衰老上皮细胞和基质细胞的增殖增加，并最终驱动老年男性的前列腺组织生长。我们提出的机制，细胞衰老可以促进良性前列腺增生的发展。提出了两个具体目标。在具体目标1中，我们将在体外和体内研究导致前列腺上皮衰老的潜在细胞改变;确定体外衰老上皮细胞表达的细胞因子和生长因子的类型;评估这些相同的蛋白质是否在体内BPH组织中以增加的水平表达，并定量评估这些细胞因子和生长因子在细胞内共表达的程度。在体内水平与衰老的标志物，包括关键的细胞周期调节蛋白，如p21和p16。在具体目标2中，我们将使用前列腺上皮细胞和基质细胞的原代培养物、反应性基质模型系统和转基因模型来检查所鉴定的细胞因子/生长因子的生物活性，并对体内BPH中增加的那些因子的潜在自分泌和旁分泌活性进行建模。此外，我们将建立一个上皮衰老的转基因小鼠模型，并在此模型中检查上皮衰老的生物学影响。良性前列腺增生在老年男性中引起相当大的发病率，高达30%的男性需要治疗这种病症，并且每年花费超过10亿美元用于这种疾病的内科和外科治疗。这些研究将为我们理解细胞衰老在这种常见疾病发病机制中的作用做出根本性贡献，并导致更有效的预防性治疗和医学治疗。公共卫生关系：良性前列腺增生通过阻塞尿路而在老年男性中引起相当大的发病率，并且高达30%的男性在其一生中的某个时候需要治疗这种病症，每年花费超过10亿美元用于这种疾病的内科和外科治疗。我们相信，这些研究将为我们了解这种常见疾病的原因做出根本性贡献，并通过这样做，导致更有效的预防性治疗和医学治疗。