Active Delivery of Platinum Nanoimmunoconjugates to Improve Breast Cancer Therapy

拟议研究的总体目标是利用新发现的主动跨内皮转运 通道，小窝泵送系统，以提供一个有效的解决方案的交付和毒性 铂（II）为基础的化疗在乳腺癌的问题。全身化疗是常见的 的形式的乳腺癌治疗，然而，铂（II）抗肿瘤药物的临床疗效是有限的显着 体内屏障抑制这些药物递送到实体瘤中，需要使用高剂量， 严重的副作用和促进耐药性的发展。为了解决这些问题， 显著改善乳腺癌治疗，我们提出了两个新的范例：1）我们新发现的 内皮细胞（EC）小窝靶向系统，以避免被动递送并显著提高速度 2）设计和开发新型的铂（II）超分子 Pt（II）-SCC是一种新型的纳米配位化合物，在肿瘤治疗中显示出显著的疗效。 在临床前乳腺癌模型中的破坏，同时是单分散的，稳定的和充分表征的。我们 主要假设是，充分利用小窝靶向抗体的优势的免疫缀合物将 增加Pt（II）-SCC向肿瘤中的递送以增强功效并降低毒性，可能导致 一种全新的抗癌疗法。这一假设将通过以下具体测试进行检验： 目的：目的1：设计并合成Pt（II）-SCC免疫偶联物。在这个目标也将设计， 合成并表征我们的Pt（II）-SCC的化学特性、纯度和物理化学性质 免疫缀合物。我们将使用靶向小窝的抗体，我们已经证明，它可以移动附着的 这使得来自血液的货物以前所未有的速度和特异性穿过EC屏障进入实体瘤。在目标2中 我们将表征靶向肿瘤EC小窝的Pt（II）-SCC免疫偶联物的体内递送。我们 将在活体小鼠中进行真实的抗体-Pt（II）-SCC靶向的动态监测， 使用组装的SCC的荧光发射的显微镜（IVM）。在目标3中，我们将评估 靶向EC的Pt（II）-SCC免疫缀合物的治疗功效。我们的靶向治疗 将使用荧光显微镜在IVM模型和非IVM Her 2/Neu肿瘤中检查系统 全身动物成像模型。该项目的长期目标是将我们的关键基本 将新发现转化为创新的药物输送平台，以提高疗效并降低毒性。 乳腺癌的治疗。

The overall objective of the proposed research is to utilize a newly discovered, active transendothelial transport pathway, the caveolae pumping system, in order to provide an effective solution to the delivery and toxicity problem of Pt(II)-based chemotherapeutics in breast cancer. Systemic chemotherapy is one of the common forms of breast cancer treatments, however clinical efficacy of Pt(II) antitumor drugs is limited by the significant in vivo barriers inhibit delivery of these drugs into solid tumors, requiring the use of high doses, producing serious side effects and facilitating development of drug resistance. In order to address these problems and significantly improve treatment of breast cancer we propose two novel paradigms: 1) our newly discovered endothelial cell (EC) caveolae targeting system to sidestep passive delivery and dramatically enhance speed and efficiency of tumor penetration, and 2) to design and develop novel platinum(II) supramolecular coordination complexes (Pt(II)-SCCs), the nanoparticles (NPs) that have shown remarkable efficacy in tumor destruction in preclinical breast cancer models while being monodisperse, stable and well-characterized. Our main hypothesis is that immunoconjugates that fully utilize the advantages of caveolae-targeting antibodies will increase Pt(II)-SCCs delivery into tumors for enhanced efficacy and reduced toxicity, potentially resulting in a fundamentally new class of anticancer therapeutics. This hypothesis will be tested by the following specific aims: In Aim 1, we plan to design and synthesize Pt(II)-SCC immunoconjugates. In this Aim will also design, synthesize and characterize the chemical identity, purity and physicochemical properties of our Pt(II)-SCCs immunoconjugates. We will use caveolae-targeted antibody which we have shown can move the attached cargo from the blood across the EC barrier into solid tumor with unprecedented speed and specificity. In Aim 2 we will characterize in vivo delivery of Pt(II)-SCC immunoconjugates targeting the EC caveolae in tumors. We will perform dynamic monitoring of antibody-Pt(II)-SCC targeting in real time in live mice with intravital microscopy (IVM) using fluorescence emission of the assembled SCCs. In Aim 3 we will assess the therapeutic efficacy of the EC-targeting Pt(II)-SCC immunoconjugates. The efficacy of our targeted delivery system will be examined in IVM models using fluorescence microscopy and in non-IVM Her2/Neu tumor models with whole-body animal imaging. The long-term goal of this project is to translate our key basic discoveries into an innovative drug delivery platform in order to improve therapeutic efficacy and reduce toxicity in the breast cancer treatment.