CCN5 Therapy for Triple Negative Breast Cancer

目前乳腺癌（BC）的治疗方法被认为可以有效地提高患者的生存率。 然而，三分之一的侵袭性三阴性乳腺癌（TNBC）患者可能会更频繁地复发 与激素受体阳性亚型相比， 疾病和抗药性。目前尚无针对侵袭性和转移性肿瘤的靶向治疗。 疾病，表明迫切需要改进治疗。我们发现CCN 5作为肿瘤抑制因子， TNBC中的蛋白质，并可能通过靶向p27 Kip 1（细胞生长调节剂）和microRNA-10 b（miR-10 b） 其被认为是侵袭、转移和耐药性的介质。然而， CCN 5仍然未知;在开发基于CCN 5的药物之前， 进入临床环境。因此，本申请的目标是创建和建立一种创新方法 用于CCN 5治疗TNBC生长和转移，通过CCN 5蛋白的合成修饰， 聚乙二醇的合并（CCN 5 PEG化; PEG-CCN 5）。在我们的初步研究中， 证明了该方法的可行性。我们已经表明，聚乙二醇化降低了血浆 清除CCN 5蛋白。用靶向PEG-CCN 5的p27 Kip 1和miR-10 b处理TNBC细胞导致细胞凋亡。 阻断细胞生长、侵袭和球体形成能力，恢复ER-α表达并使其对 化疗体内研究的结果表明，皮下递送PEG-CCN 5至肿瘤细胞是有效的。 荷瘤小鼠导致强烈的肿瘤摄取并抑制肿瘤生长和转移。这些初步 研究结果构成了当前应用的基础，我们建议扩展这些研究，以确定 通过确定功能功效和作用机制（目的1），MTD， 生物分布和体外和体内毒性（目的2）。最后，研究了抗肿瘤和抗转移的功效， 抗激素、化疗或两者的组合治疗也将在细胞来源的原位移植中确定。 TNBC异种移植物、同基因模型和PDX模型（Aim 3）。这些研究预计将确定一个最佳的 PEG化蛋白，其将抑制TNBC生长和进展以及使TNBC细胞对他莫昔芬敏感 和紫杉醇具有最小的全身毒性或对健康细胞或器官的不良影响。这些方法应 CCN 5的治疗效用及其在抑制中的机制见解的显著进步的知识 关于TNBC .

Current therapies for breast cancer (BC) are firmly believed to improve patient survival efficiently. However, one-third of aggressive triple-negative breast cancer (TNBC) patients may relapse more frequently compared to hormone receptor-positive subtypes, and patients may eventually develop the distant metastatic disease and drug resistance. There are no targeted therapies currently available for invasive and metastatic diseases, indicating a dire need for improved therapy. We revealed that CCN5 acts as a tumor suppressor protein in TNBC and possibly by targeting p27Kip1, which is a cell growth regulator, and microRNA-10b (miR-10b) which is known as a mediator of invasion, metastasis, and drug resistance. However, therapeutic application of CCN5 remains unknown; this critical knowledge is required before CCN5-based drugs can be developed and moved into a clinical setting. Thus, the goal of this application is to create and establish an innovative approach for CCN5 therapy for TNBC growth and metastasis by synthetic modification of CCN5 protein through the amalgamation of polyethylene glycol (CCN5 PEGylation; PEG-CCN5). In our preliminary studies, we have demonstrated the feasibility of the proposed method. We have shown that that PEGylation decreases plasma clearance of CCN5 protein. Treatment of TNBC cells with p27Kip1 and miR-10b targeting PEG-CCN5 results in blocking cell growth, invasion, and sphere-forming ability, restoring ER-α expression and sensitizing it to chemotherapy. The results of the in vivo studies suggest that subcutaneous delivery of PEG-CCN5 to tumor- bearing mice leads to robust tumor uptake and suppresses tumor growth and metastasis. These preliminary findings form the basis for the current application, in which we propose to extend these studies to identify an optimal PEG-CCN5 derivative by determining functional efficacy and mechanism of action (Aim 1), MTD, biodistribution, and toxicity in vitro and in vivo (Aim 2). Finally, antitumor and anti-metastatic efficacy in combination treatment of anti-hormone, chemotherapy or both will also be determined in cell-derived orthotopic TNBC xenograft, syngeneic models and PDX model (Aim 3). These studies are expected to identify an optimal PEGylated protein that will inhibit TNBC growth and progression as well as sensitize TNBC cells to tamoxifen and Paclitaxel with minimal systemic toxicity or ill effects on healthy cells or organs. These approaches should significantly advance knowledge on therapeutic utility of CCN5 and its mechanistic insights in the suppression of TNBC. .