Stabilizing nuclear p27kip1 as a therapeutic target for endometrial cancer

稳定核 p27kip1 作为子宫内膜癌的治疗靶点

基本信息

批准号：
9094005
负责人：
TIMOTHY J CARDOZO
金额：
$ 7.94万
依托单位：
NEW YORK UNIVERSITY SCHOOL OF MEDICINE
依托单位国家：
美国
项目类别：
财政年份：
2014
资助国家：
美国
起止时间：
2014-06-13 至 2019-05-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/9094005
关键词：
Address Affect Atypical Endometrial Hyperplasias Binding Biological Availability Biological Markers Biopsy Cancer Biology Cell Cycle Cell Cycle Proteins Cell Cycle Regulation Cell Nucleus Cell Proliferation Cells Cessation of life Chemicals Complex Crystallization Cyclin-Dependent Kinase Inhibitor Data Development Disease Endometrial Endometrial Carcinoma Endometrium Epithelial Epithelial Cell Proliferation Epithelial Cells Estrogens Event G1 Arrest G1 Phase Generations Growth Growth Inhibitors Gynecologic Health Hormonal Carcinogenesis Hormones Human Image Analysis Immunocompromised Host In Vitro Injection of therapeutic agent Knowledge Lead Learning Left Libraries Malignant - descriptor Malignant Neoplasms Mediating Microscopy Molecular Molecular Target Mus Neoplasm Metastasis Nuclear Oncogenes Outcome Pathogenesis Pathway interactions Patients Pharmaceutical Preparations Progesterone Proteasome Inhibitor Proteins Publishing Regulation Reporting Role System Testing Therapeutic Therapeutic Agents Therapeutic Intervention Therapeutic Uses Tissues Toxic effect Transforming Growth Factor beta Tumor Suppressor Proteins Tumor Volume Ubiquitin X-Ray Crystallography Xenograft procedure biophysical analysis cancer cell cancer therapy carcinogenesis cellular imaging chemical group in vivo inhibitor/antagonist insight knock-down migration mouse model multicatalytic endopeptidase complex new therapeutic target novel novel strategies novel therapeutic intervention pharmacophore prevent protein degradation scaffold small molecule spatiotemporal therapeutic target trafficking treatment strategy tumor ubiquitin ligase ubiquitin-protein ligase

项目摘要

DESCRIPTION (provided by applicant): As loss of cell cycle regulation is a hallmark of carcinogenesis, identifying novel therapeutic targets aimed at restoring growth control is an important approach to cancer therapy. Endometrial cancer (ECA) is the most common gynecologic malignancy in the US with 49,470 new cases and over 8,190 deaths estimated for 2013. The major objectives of this proposal address mechanisms involved in the pathogenesis of estrogen (E2)- induced Type I ECA (85% of ECAs) and a new potential therapy for this disease that involves inhibiting degradation of the tumor suppressor, p27kip1 (p27), a key cell cycle protein that arrests cell proliferation. We reported that E2 induces ubiquitin-mediated degradation of nuclear p27 by its specific E3 ligase, SCF- Skp2/Cks1, in endometrial epithelial (EECs) and ECA cells with increased cell proliferation. Conversely, progesterone (Pg; a therapy for low grade ECA) as well as TGF-ß, increase p27 in the nucleus and inhibit cell proliferation by preventing p27 degradation. Therefore, we provide compelling evidence that p27 is a key target for growth regulation in the endometrium and in endometrial carcinogenesis. We have identified novel small molecule inhibitors of Skp2/Cks1 (Skp2E3LIs) that only increase nuclear p27, which is critical since cytoplasmic p27 mediated migration/metastasis. Furthermore, Skp2E3LIs block both E2-induced degradation of nuclear p27 and proliferation in vitro in ECA cells and {in vivo in mouse EECs}. Importantly, Skp2E3LIs have the potential to be a major therapeutic advancement over current general proteasome inhibitors that indiscriminately block protein degradation including oncogenes. Whereas Skp2/Cks1 causes p27 degradation, the E3 ligase APC/Cdh1 targets Cks1/Skp2 for destruction leaving p27 intact. Interestingly, we show that E2 decreases Cdh1and thereby increases Skp2/Cks1 for p27 degradation whereas Pg and TGF-ß increase Cdh1 to increase nuclear p27. Therefore, p27 degradation can be inhibited both, by increasing Cdh1 or by blocking Skp2. As such, we will test two main hypotheses: 1. that the Cdh1-Skp2/Cks1-p27axis is important in cell cycle dysregulation by the ubiquitin proteasome system (UPS); 2. that Skp2E3LIs have significant translational value for the treatment of ECA. We propose to: 1. Use E2, Pg, and TGF-ß as molecular switches to learn how Cdh1 is controlled to affect p27 levels. 2. Show that co-localization of p27 and Cdh1 in human biopsy tissue is a biomarker for positive outcomes of Pg therapy. {3. Perform co-crystallization/NMR structural analysis of Skp2-Cks1-Skp2E3LI complexes for chemically optimizing current lead compounds to define the role of p27 in ECA in vitro and in vivo.} 4. Quantify the effects of Skp2E3LIs on intracellular [nuclear] trafficking of p27 Skp2, and Cks1 together with cell cycle analysis by single cell imaging microscopy. 5. Test Skp2E3LIs for their efficacy in blocking the growth of human ECA tumors in mouse models. As the degradation of nuclear p27 occurs in numerous cancers, our studies should impact the cancer biology field by providing mechanistic insights into the role of the UPS in cancer and the use of Skp2E3LIs as a novel approach to cancer therapy.

描述（由申请人提供）：由于细胞周期调节的丧失是癌发生的标志，因此确定旨在恢复生长控制的新治疗靶点是癌症治疗的重要方法子宫内膜癌（ECA）是美国最常见的妇科恶性肿瘤。 2013 年估计有 49,470 例新病例和超过 8,190 例死亡。该提案的主要目标是解决雌激素 (E2) 诱导型发病机制中涉及的机制I ECA（占 ECA 的 85%）和一种针对这种疾病的新的潜在疗法，涉及抑制肿瘤抑制因子 p27kip1 (p27) 的降解，p27kip1 (p27) 是一种阻止细胞增殖的关键细胞周期蛋白。子宫内膜上皮 (EEC) 和 ECA 细胞中细胞增殖离线，通过其特异性 E3 连接酶 SCF-Skp2/Cks1 抑制核 p27。黄体酮（Pg；低级别 ECA 的治疗方法）以及 TGF-β 可以增加细胞核中的 p27，并通过防止 p27 降解来抑制细胞增殖。因此，我们提供了令人信服的证据，表明 p27 是子宫内膜生长调节的关键靶标。我们已经鉴定出新的 Skp2/Cks1 小分子抑制剂 (Skp2E3LIs)，它们仅增加核 p27，这对于细胞质来说至关重要。此外，Skp2E3LI 可以阻断 E2 诱导的细胞核 p27 降解和体外 ECA 细胞增殖（体内小鼠 EEC）。重要的是，Skp2E3LI 有可能成为目前通用蛋白酶体的重大治疗进展。不加区别地阻止蛋白质降解（包括除 Skp2/Cks1 之外的致癌基因）的抑制剂会导致 p27 降解（即 E3 连接酶）。 APC/Cdh1 以 Cks1/Skp2 为目标进行破坏，使 p27 保持完整，我们表明 E2 会减少 Cdh1，从而增加 Skp2/Cks1 的 p27 降解，而 Pg 和 TGF-ß 会增加 Cdh1 的增加，从而增加核 p27 的降解。，通过增加 Cdh1 或阻止 Skp2 因此，我们将测试两个主要假设： 1. Cdh1-Skp2/Cks1-p27axis 在泛素蛋白酶体系统 (UPS) 的细胞周期失调中发挥重要作用；2. Skp2E3LI 对 ECA 的治疗具有重要的转化价值。 ß 作为分子开关，了解如何控制 Cdh1 影响 p27 水平 2. 显示 p27 和 Cdh1 的共定位。人类活检组织中的 p27 是 Pg 疗法积极结果的生物标志物 {3. 对 Skp2-Cks1-Skp2E3LI 复合物进行共结晶/NMR 结构分析，以化学优化当前的先导化合物，以确定 p27 在体外和体内的作用。 4. 通过细胞周期分析量化 Skp2E3LIs 对 p27 Skp2 和 Cks1 细胞内 [核] 运输的影响5. 在小鼠模型中测试 Skp2E3LI 阻止人类 ECA 肿瘤生长的功效由于核 p27 的降解发生在许多癌症中，我们的研究应该通过提供对其作用的机制见解来影响癌症生物学领域。 UPS 在癌症中的作用以及 Skp2E3LI 作为癌症治疗新方法的用途。