Mitochondria in Prostate Cancer Diversity

前列腺癌中的线粒体多样性

• 批准号: 9237241
• 负责人: KESHAV K SINGH
• 金额: $ 33.63万
• 依托单位: UNIVERSITY OF ALABAMA AT BIRMINGHAM
• 依托单位国家: 美国
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-04-01 至 2021-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9237241
• 关键词: Address; Affect; African American; Age; Androgen Receptor; Androgens; Apoptosis; Applications Grants; Basic Cancer Research; Bioinformatics; Cell Line; Cell Nucleus; Cells; Complex; DNA; DNA Binding Domain; Development; Diagnosis; Disease; Electron Transport Complex III; Epithelial Cells; Family; Genes; Genetic; Genetic Transcription; Germ-Line Mutation; Green Fluorescent Proteins; Inherited; Malignant Neoplasms; Malignant neoplasm of prostate; Missense Mutation; Mitochondria; Mitochondrial DNA; Mothers; Mus; Mutation; N Domain; N-terminal; Neoplasm Metastasis; Nuclear; Nuclear Localization Signal; Oxidative Phosphorylation; PC3 cell line; Play; Ploidies; Polymorphism Analysis; Prostate; Prostatic Neoplasms; Proteins; Race; Receptor Gene; Recording of previous events; Role; Signal Transduction; Testing; Thinking; Time; Tissues; Tumor Volume; Tumor stage; Variant; Xenograft Model; base; cancer health disparity; caucasian American; cell transformation; complex IV; early onset; member; men; mitochondrial genome; mortality; mutant; novel; oligomycin sensitivity-conferring protein; prognostic significance; prostate cancer cell; prostate carcinogenesis; public health relevance; racial difference; racial disparity; racial diversity; receptor; receptor expression; tumor

 DESCRIPTION (provided by applicant): The androgen receptor (AR) plays an important role in normal development of the prostate gland, in prostate carcinogenesis, and in the progression of prostate cancer to advanced metastatic disease. Traditional thinking is that AR localizes exclusively to the nucleus and that nuclear AR regulates genes that are essential to prostate cancer development. This is true. However, we demonstrate a previously unrecognized function of AR in mitochondria. We have discovered that AR 1) directly localizes into the mitochondria and 2) indirectly transcriptionally regulates nuclear genes whose products localize into mitochondria and perform mitochondrial functions. Our studies reveal that i) AR localizes into mitochondria in primary prostate tissues and cell lines, ii) AR is imported into isolated mitochondria, and iii) AR contains a mitochondrial localization signal (MLS) capable of targeting foreign proteins, such as green fluorescent protein, into mitochondria. Indirectly, AR controls expression of a variety of nuclear DNA (nDNA)-encoded mitochondrial oxidative phosphorylation (mtOXPHOS) subunits, including NDUFB8 (Complex I), SDHB (Complex II), UQCRC2 (Complex III), COXII subunit (Complex IV), and ATP5A (Complex V). AR also down-regulates the TFAM, GFM1, and GFM2 genes, which control mitochondrial DNA (mtDNA) content. Consistent with this, the mtDNA content and the expression of mtDNA-encoded COX II protein is significantly reduced in PC3-AR prostate cells expressing AR. Notably, we demonstrate that the mtDNA content in prostate tumors of African-Americans (AA) is >6 times less than in tumors of Caucasian-Americans (CA). mtDNA content was also lower in normal prostates of AA than CA. To identify the underlying mitochondrial basis of prostate cancer diversity, we conducted comprehensive, race-based bioinformatics analyses of variants in more than 6000 AA and 33,000 CA and discovered, in the AR gene of AA, missense variants located in two domains: the N-terminal domain containing the MLS and the DNA-binding domain. Of note, missense mutations in CA were found only in the hinge domain containing the nuclear localization signal (NLS) of AR. Expression of AR variant S598G in PC3 cells reduced more than the wild type the expression of TFAM, which controls mtDNA content. We hypothesize that AR missense variants/mutants present, solely in AA, contribute to the "gain" or "loss" of mitochondrial function and thereby to prostate cancer diversity in AA. AIM 1: Determine the prognostic significance of AR missense variants/mutants and mtDNA content on prostate cancer metastasis and reoccurrence in AA and CA. AIM 2: Evaluate the significance of mitochondrial AR missense variants/mutants as direct regulators of mitochondrial functions that affect composition, organization, stability, and activity of mtOXPHOS super-complexes and apoptosis. AIM 3: Evaluate the significance of nuclear AR missense variants/mutants as indirect regulators of mitochondrial function. AIM 4: Use mouse xenograft model to establish the significance of mitochondrial and nuclear AA- and CA-specific AR missense variants/mutants on prostate tumorigenesis and metastasis.