A higher immune system model by combination of several types of artificial tissues (connective tissue, carcinoma tissue, and lymphoid tissue)

本研究的重点是通过结合几种类型的人工组织，包括结缔组织、癌组织、淋巴组织和血管，构建“更高的体外免疫系统模型”。本研究的主要内容如下：（1）人工结缔组织的构建：我们在体外构建了一个由人成纤维细胞和人脐静脉内皮细胞（HUVEC）组成的结缔组织模型，该模型由人成纤维细胞和人脐静脉内皮细胞（HUVEC）在I型胶原凝胶中组成。在该模型中，HUVEC迁移并形成细血管网，而不添加任何特殊的生长因子。(2)人工癌组织的研制：我们重建了两种类型的人工癌组织。一种是软组织类型，我们能够在显微镜下观察到两种细胞类型的生长（c ...更多信息 癌细胞和成纤维细胞）在超过30天的真实的时间内。另一种是用于免疫组织化学分析的硬组织类型。在该模型中，我们可以控制癌细胞的生长模式，即，扩张性或侵入性生长，通过使用的细胞因子的组合。(3)人工淋巴组织的发育：人工淋巴组织在补充有OKT-3和纤维蛋白原、人成纤维细胞、淋巴细胞和IL-2的I型胶原网络中组织。在该模型中，淋巴细胞增殖良好，并分泌几种类型的细胞因子，如IFN-γ超过10天。(4)初步免疫系统模型的开发：我们重建了一个初步的高级免疫系统模型，该模型分为三层，即，树突细胞层（下）、癌组织层（中）和淋巴组织层（上）。在该模型中，我们能够在显微镜下观察树突状细胞向癌组织中的迁移以及迁移的树突状细胞对坏死癌细胞的捕获，这是真实的时间。我们还通过测定树突状细胞分泌的IL-12浓度，简单快速地评价了树突状细胞的免疫学质量。我们成功地利用从手术切除的标本中获得的各种类型的细胞开发了几种类型的人工组织。然而，在本研究期间，我们没有成功地将这些人工组织与人工血管连接起来。少

This study was focused on the construction of "a higher in vitro immune system model" by combining several types of artificial tissues, including connective tissues, carcinoma tissues, lymphoid tissues, and blood vessel. To perform the research plan, a new research area "tumor technology" was organized by collaboration of "Division of tumor immunology" and "Division of medical technology".Data obtained for duration of this study are as follows:(1) Development of artificial connective tissue: we reconstituted an in vitro connective tissue model which is made up of human fifroblasts and human umbrical vein-derived endothelial cells (HUVEC) in a type-I collagen gel. In this model, HUVEC migrate and form nets of fine blood vessels without addition of any special growth factors.(2) Development of artificial carcinoma tissue: we reconstituted two types of artificial carcinoma tissue. One is a soft tissue type in which we are able to observe microscopically the growth of the two cell types (c … More arcinoma cells and fibroblasts) in real time for more than 30 days. Another is a hard tissue type which is prepared for immunohistochemical analysis. In this model, we can control the growth pattern of carcinoma cells, i.e., expansive or invasive growth, by combination of cytokines used.(3) Development of artificial lymphoid tissue: artificial lymphoid tissue is organized in a type I collagen net supplemented with OKT-3 and fibrinogen, human fibroblasts, lymphocytes, and IL-2. In this model, lymphocytes well proliferate and secrete several types of cytokines such as IFN-g for more than 10 days.(4) Development of preliminary immune system model: we reconstituted a preliminary higher immune system model which is organized in three layers, i.e., dendritic cell layer (lower), carcinoma tissue layer (middle), and lymphoid tissue layer (upper). In this model, we are able to observe microscopically migration of dendritic cells into carcinoma tissue and capture of necrotic carcinoma cells by migrating dendritic cells in real time. We also estimate simply and quickly immunological quality of dendritic cells by measuring IL-12 concentration secreted by dendritic cells.We succeed in developing several types of artificial tissues using various types of cells obtained from surgically resected specimens. However, we did not succeed in connecting these artificial tissues with artificial blood vessel within this research period. Less