Therapeutic Self-Assembly of Recognition Elements on Cell Surfaces

描述（由申请人提供）：我们提出以下个性化抗癌治疗的范例：医生确定他/她想要从患者身上消除的细胞类型的独特表面特征（或“指纹”）。在将指纹与健康细胞的指纹进行比较的指导下，医生将现成的试剂组合在一起，并给病人使用，专门杀死这种细胞类型（同时保护类似的非目标细胞和组织）。这个建议有多现实？使用单克隆抗体（MAb’s）可以很容易地识别淋巴瘤和白血病的免疫表型指纹图谱。当前应用的主题是我们范例的第二个组成部分：工程模块化现成试剂，可以组合在一起，以触发具有这些独特指纹的靶细胞的死亡，同时保护健康细胞。在此资助期结束时，我们将为完整的范例提供概念验证实验，并根据其免疫表型指纹消除或保护三种模型细胞系（CCRF-CEM, Raji, HL-60）中的任何一种或两种。我们的目标是在未来三年内证明分子混合物可以在细胞表面执行AND和NOT逻辑操作，并具有治疗上适用的结果（例如，细胞死亡或存活）。我们将首先构建模块化试剂，可以组合成寡核苷酸- fab（抗体片段）偶联物，靶向细胞表面标记物。为了选择性靶向CCRF-CEM、Raji和HL-60细胞系，我们将合成能够靶向CD71、CD5、CD52和CD33的试剂。然后将追求以下具体目标：目标1，和逻辑演示：在每个模型细胞系的表面上，基于选择性寡核苷酸的fab -寡核苷酸偶联对的交联。为此，我们还将研究交联引发的凋亡/坏死过程，无论是否有药物释放。目的2，非逻辑论证：选择性保护每一个模型细胞系免受在所有三种细胞系上发现的药物寡核苷酸偶联靶向标记物的作用。在这个资助期结束时，我们将准备在患者的实际样本上测试这种方法，并开始在白血病和淋巴瘤的小鼠模型中进行自我组装的研究。我们将为以下个性化抗癌治疗范例提供概念验证：医生确定他/她想要从患者体内清除的细胞类型的独特表面特征（或“指纹”）。在将指纹与健康细胞的指纹进行比较的指导下，医生将现成的试剂组合在一起，并给病人使用，专门杀死这种细胞类型（同时保护类似的非目标细胞和组织）。这个建议有多现实？使用单克隆抗体（MAb’s）可以很容易地识别淋巴瘤和白血病的免疫表型指纹图谱。当前应用的主题是我们范例的第二个组成部分：工程模块化的现成试剂，可以组合在一起，以触发具有这些独特指纹的靶细胞的死亡，同时保护健康细胞。在此资助期结束时，我们将为完整的范例提供概念验证实验，并根据其免疫表型指纹消除或保护三种模型细胞系中的任何一种或两种。

DESCRIPTION (provided by applicant): We propose the following paradigm for personalized anti-cancer therapy: a physician determines the unique surface-based characteristic (or "fingerprint") of a cell type that he/she would like to target for elimination from a patient. Guided by the comparison of that fingerprint to the fingerprints of healthy cells, the physician combines off-the-shelf reagents and administers them to the patient, specifically killing that cell type (while protecting similar non-target cells and tissues). How realistic is this suggestion? Immunophenotype fingerprints for lymphomas and leukemias could be readily identified using monoclonal antibodies (MAb's). The topic of the current application is the second component of our paradigm: engineering modular off-the-shelf reagents that may be combined in order to trigger the death of target cells bearing these unique fingerprints, while protecting healthy cells at the same time. At the end of this funding period, we will provide proof-of-concept experiments for the complete paradigm, and either eliminate or protect any one or two out of three model cell lines (CCRF-CEM, Raji, HL-60), based on their immunophenotype fingerprints. It is our goal over the next three years to demonstrate that mixtures of molecules can perform AND and NOT logical operations on cell surfaces with therapeutically applicable outcomes (e.g., cell death or survival). We will first construct modular reagents that can be combined into oligonucleotide-Fab (antibody fragment) conjugates targeting cell- surface markers. In order to target selectively each of CCRF-CEM, Raji, and HL-60 cell lines, we will synthesize the reagents capable of targeting CD71, CD5, CD52, and CD33. The following specific aims will be then pursued: Aim 1, AND Logic Demonstration: Selective oligonucleotide-based crosslinking of pairs of Fab-oligonucleotide conjugates on the surface of each one of the model cell lines. In this aim we will also study apoptotic/necrotic processes triggered by crosslinking with and without drug release. Aim 2, NOT Logic Demonstration: Selective protection of each one of the model cell lines from the action of drug-oligonucleotide conjugate targeting markers found on all three cell lines. At the end of this funding period we will be ready to test this approach on actual samples from patients, and to initiate studies of self-assembly in murine models of leukemia and lymphoma. We will provide a proof-of-concept for the following paradigm for personalized anti- cancer therapy: a physician determines the unique surface-based characteristic (or "fingerprint") of a cell type that he/she would like to target for elimination from a patient. Guided by the comparison of that fingerprint to the fingerprints of healthy cells, the physician combines off-the-shelf reagents and administers them to the patient, specifically killing that cell type (while protecting similar non-target cells and tissues). How realistic is this suggestion? Immunophenotype fingerprints for lymphomas and leukemias could be readily identified using monoclonal antibodies (MAb's). The topic of the current application is the second component of our paradigm: engineering modular off- the-shelf reagents that may be combined in order to trigger the death of target cells bearing these unique fingerprints, while protecting healthy cells at the same time. At the end of this funding period, we will provide proof-of-concept experiments for the complete paradigm, and either eliminate or protect any one or two out of three model cell lines, based on their immunophenotype fingerprints.