SULFATASE METABOLISM IN MULTIPLE SULFATASE DEFICIENCY

硫酸盐酶缺乏症包括一些溶酶体储存 疾病，是精神发育迟滞和身体残疾的重要原因 畸形。由于这些疾病的生化和酶基础 已经被定义，这些疾病的一个重要方面是 诊断和治疗策略是对 相关酶的新陈代谢。多发性硫酸酯酶缺乏症 一种独特的遗传疾病，由至少7个基因缺陷引起 不同的硫酸盐酶，似乎是由于对 酶促合成或以前未知的加速降解的原因 细胞酶。几种硫酸盐酶代谢的比较 在具有正常或单一硫酸酯酶缺陷的MSD细胞中，细胞可能 产生控制细胞水解酶水平的新知识。 拟议的研究将使用培养的细胞作为材料来源。全 的硫酸盐酶进行酶学比较，以确定哪些共同的 可能是硫酸盐酶稳定性所必需的因素，以期 定义维持正常酶水平所必需的细胞过程。一个 主要的重点将是使用硫酸盐酶抗体，特别是 艾杜酸硫酸酶(Ids-S)，以测量合成和降解速度 这种酶在培养细胞中的含量。IF脉冲追逐标记实验 表明酶降解是MSD的主要缺陷，步骤 将参与翻译后处理和传输 调查过了。如果表明合成速度下降，那么这些因素 控制合成，包括可翻译的mRNA的数量，将是 下定决心。这种探针也可用于亨特综合征的研究 (IDS-S缺乏)及其变异体，并可能导致关于 精神发育迟滞在这种疾病中的发病机制。最后，一个基因 将利用对MSD的理解的方法。已建立的啮齿动物 将对细胞系进行诱变并筛选出具有MSD的突变株 表型和那些似乎具有类似MSD的遗传缺陷的人， 正如在MSD-啮齿动物细胞杂交中缺乏互补所证明的那样 分析过了。在这些突变体的用途中，将有人类的图谱 负责将MSD表型纠正为特定人的基因 染色体。新陈代谢研究和基因分析的结合是 可能导致更好地定义维护中涉及的控制 细胞酶的水平。

The sulfatase deficiency disorders include a number of lysosomal storage diseases and are a significant cause of mental retardation and physical deformities. Since the biochemical and enzymic basis for these disorders have been defined, an important facet of these diseases necessary for diagnostic and therapeutic strategies is the determination of the metabolism of the enzymes involved. Multiple sulfatase deficiency (MSD) is a unique genetic disorder resulting from deficiencies of at least seven distinct sulfatases and appears to result from either defective control of enzymic synthesis or a previously unknown cause of increased degradation of cellular enzymes. The comparison of metabolism of a number of sulfatases in MSD cells with normal or single sulfatase deficiency cells is likely to produce new knowledge of control of levels of cellular hydrolases. The proposed studies will use cultured cells as a source of material. All of the sulfatases will be compared enzymatically to determine what common factors may be necessary for stability of sulfatases, with a view toward defining cellular processes necessary to maintain normal enzyme levels. A major emphasis will be to use antibodies to sulfatases, in particular iduronate sulfatase (IdS-S), to measure rates of synthesis and degradation of this enzyme in cultured cells. If pulse-chase labeling experiments indicate that enzyme degradation is the major defect in MSD, the steps involved in post-translational processing and transport will be investigated. If decreased rates of synthesis are indicated, the factors controlling synthesis, including amounts of translatable mRNA, will be determined. Such probes can also be used for the study of Hunter syndrome (IdS-S deficiency) and its variants and may lead to information about the pathogenesis of mental retardation in this disease. Finally, a genetic approach to the understanding of MSD will be utilized. Established rodent cell lines will be mutagenized and screened for mutants having the MSD phenotype and those which appear to have a genetic defect similar to MSD, as evidenced by lack of complementation in MSD-rodent cell hybrids will be analyzed. Among the uses of such mutants will be the mapping of the human gene responsible for correcting the MSD phenotype to a specific human chromosome. This combination of metabolic studies and genetic analysis is likely to lead to better definition of the controls involved in maintenance of cellular enzyme levels.