CHARACTERIZATION OF LYMPHOBLAST PEPTIDE RECEPTORS

在过去，我们开发了一种支持细胞生长的检测方法 儿童急性淋巴母细胞瘤的恶性集落 白血病和非霍奇金淋巴瘤。我们的方法不同 来自其他人报告的体外培养技术(尽管 零星地)长期细胞生长和细胞系的建立 从一个单一的蜂群通过可以完成。细胞系 然而，建立是重要的，因为细胞系提供了 为体外研究提供无限、稳定的细胞来源。细胞系 在我们实验室建立的已被证明具有相同的 免疫表型、生化酶谱、免疫表型 和核型作为患者的肿瘤。 我们最近确定了不同的恶性亚型 淋巴母细胞具有独特的多肽受体特征 荷尔蒙。而9个未成熟的T淋巴母细胞系 拥有IGF-I受体和缺乏胰岛素受体，20人中有19人 未成熟的B淋巴母细胞系具有胰岛素受体和 缺乏IGF-I受体。我们已经证明T淋巴母细胞 对纳克浓度的IGF-I有反应的增殖 而不是无血清介质中的胰岛素。此外，补充IGF-I 已被证明是关键的增长因素 开发一种可重复性的、标准化的方法 T淋巴母细胞系的体外建立基于这些 数据，我们假设多肽激素如胰岛素和 IGF-I可能是血管生成所必需的关键生长因子 恶性造血细胞及其多肽的增殖 受体功能阻断可能严重限制细胞 扩散。这项建议的目的是研究 特异性多肽(I、IGF-I、IGF-II、CH)的生物学功能 具有(或缺乏)特异性的恶性造血细胞 多肽受体，并确定其特异性，动力学， 结合的特异性多肽受体的结构和功能 研究，化学交联在十二烷基硫酸钠-聚丙烯酰胺凝胶上，受体 多克隆和单抗受体的磷酸化 抗体。这些研究将加深我们对 肿瘤细胞中的多肽/多肽受体功能，将有助于 建立建立细胞系的标准方法，以及 可能为抗肽受体治疗提供基础。 未来的恶性血液病。

In the past, we developed an assay which supports the growth of malignant colonies from children with acute lymphoblastic leukemia and non-Hodgkin's lymphoma. Our methodology differs from in vitro culture techniques reported by others in that (albeit sporadically) long term cell growth and cell line establishment from passage of a single colony could be accomplished. Cell line establishment, however, is important because cell lines provide an unlimited, stable source of cells for in vitro studies. Cell lines established in our laboratory have been shown to have the same immunophenotype, biochemical enzyme profile, immunogenotype and karyotype as the patient's tumor. We have recently determined that different subtypes of malignant lymphoblasts possess unique profiles for receptors to peptide hormones. While each of 9 immature T-lymphoblast cell lines possess IGF-I receptors and lack insulin receptors, 19 of 20 immature B-lymphoblast cell lines possess insulin receptors and lack IGF-I receptors. We have shown that T-lymphoblasts proliferate in response to nanogram concentrations of IGF-I but not insulin in serum-free media. Moreover, supplemental IGF-I has proven to be a key growth factor necessary in the development of a reproducible, standardized method for the establishment of T-lymphoblast cell lines in vitro. Based on these data, we hypothesize that peptide hormones such as insulin and IGF-I may be critical growth factors necessary for the proliferation of malignant hematopoietic cells and that peptide receptor function blockage may severely limit cellular proliferation. The objective of this proposal is to study the biologic function of specific peptides (I, IGF-I, IGF-II, CH) on malignant hematopoietic cells which possess (or lack) specific peptide receptors, and to determine the specificity, kinetics, structure and function on specific peptide receptors by binding studies, chemical cross-linking on SDS-PAGE, receptor phosphorylation and by polyclonal and monoclonal antireceptor antibodies. These studies will augment our understanding of peptide/peptide receptor function in malignant cells, will help establish standard methodologies for cell line establishment, and may provide the foundation for antipeptide receptor therapy for hematopoietic malignancies in the future.