NEUROBIOLOGY OF SULFATED GLUCURONYL GLYCOCONJUGATE

该项目的主要目标是研究化学物质 结构、组织学和地形学定位、生物合成 和调节新的硫酸化葡萄糖醛酸的表达 糖脂（SGGL）在神经系统发育中的作用。 这些 糖脂抗原是阶段特异性的， 在中枢神经系统中调节， 细胞分化和细胞迁移期。 SGG表位 被单克隆抗体HNK-1识别， 人类自然杀伤细胞上的抗原 SGG表位也是 表达在一组参与细胞-细胞免疫的糖蛋白上， 相互作用，如神经细胞粘附分子（N-CAM）， 髓鞘相关糖蛋白（MAG）和细胞外基质 蛋白质室管膜蛋白 神经系统的正常发育 系统依赖于这些分子， 在细胞分裂、细胞迁移和形成特定的传入和 传入连接 计划进行研究，以确定 这些糖脂的精确结构相对于 碳水化合物、脂肪酸、鞘氨醇碱和糖苷 联动 糖脂的灵敏定量测定将是 通过使用免疫化学、HPLC和HPLC-mass 光谱技术 这些基因的发育表达 糖脂在中枢神经系统的不同领域将进行研究。 在各种物种和神经突变体中的表达将是 研究了 SGGL的细胞和亚细胞定位 在大鼠神经系统的胚胎发育过程中， 通过化学和免疫化学方法进行研究。 生物合成 的SGGL将通过表征各种 糖基转移酶 SGGL表达的调节 发展将通过确定表达的 各种糖基转移酶和水解酶。 这些基础研究 将为今后的工作奠定基础上的职能作用 糖脂和糖蛋白上的SGG表位。

The major goal of this project is to investigate the chemical structure, histological and topographical localization, biosynthesis and regulation of expression of the noval sulfated glucuronyl glycolipids (SGGL) in the developing nervous system. These glycolipid antigens are stage specific and developmentally regulated in the central nervous system during the important period of cell differentiation and cell migration. The SGG epitope is recognized by monoclonal antibody HNK-1, raised to surface antigens on human natural killer cells. SGG epitope is also expressed on a group of glycoproteins involved in cell-cell interaction such as, neural cell adhesion molecules (N-CAMs), myelin associated glycoprotein (MAG), and extra-cellular matrix proteins, ependymins. The proper development of the nervous system depends upon these molecules which are possibly involved in cell division, cell migration and for specific afferent and afferent connections. Studies are planned to determine the precise structure of these glycolipids with respect to nature of the carbohydrate, fatty acid, sphingosine base and glycosidic linkages. Sensitive quantitative assay of the glycolipids will be developed by using immunochemical, HPLC, and HPLC-mass spectrometric techniques. Developmental expression of these glycolipids in the different areas of the CNS will be studied. Expression in various species and neurological mutants will be investigated. The cellular and sub-cellular localization of SGGL during embryonic development of the rat nervous system will be studied by chemical and immunochemical methods. Biosynthesis of the SGGL will be investigated by charaterizing the various glycosyl transferases. Regulation of SGGL expression during development will be studied by determining the expression of the various glycosyl transferases and hydrolases. These basic studies will lay the foundation for the future work on the functional role of the SGG epitope on the glycolipids and glycoproteins.