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HEPATIC GLUTAMINASE

肝谷氨酰胺酶

基本信息

批准号：
3236143
负责人：
MALCOLM WATFORD
金额：
$ 11.23万
依托单位：
RUTGERS, THE STATE UNIV OF N.J.
依托单位国家：
美国
项目类别：
财政年份：
1989
资助国家：
美国
起止时间：
1989-07-01 至 1992-12-31
项目状态：
已结题

项目摘要

Glutamine plays an important biosynthetic role in all mammalian cells. Glutamine is used by the liver during diabetes, the kidney during metabolic acidosis and the mammary gland during lactation, it is also a major respiratory fuel for many rapidly dividing cells including cancer cells. The major enzymes of glutamine catabolism in mammalian tissues are two isozymes of phosphate activated glutaminase. The liver type is found exclusively in adult liver while the other enzyme (kidney-type) is found in all other glutamine utilizing tissues, including fetal liver and hepatoma cells. The aim of the work described is to characterize and understand the role and regulation of phosphate activated glutaminase in rat liver. This work stems from the observation that hepatic glutaminase activity is increased 4-fold during streptozotocin diabetes. The enzyme has been purified, specific antibodies raised against it and used to identify a putative cDNA. The identify of the cDNA will be confirmed by comparison of the DNA and amino acid sequences, hybrid selection of mRNA and analysis of fusion peptide. The cDNA will be used to determine the relative abundance of mRNA and the rate of transcription hepatic glutaminase gene in liver from control and diabetic rats. Extracellular stimuli involved in the regulation of hepatic glutaminase gene expression will be identified using isolated hepatocytes and hepatoma cells. The cDNA will be used to identify genomic sequences encoding liver-type glutaminase and other glutamine utilizing enzymes. The distribution of liver- and kidney-type glutaminase (activity, protein and mRNA) will be determined in different hepatoma cells and in rat liver at different stages of development. Chromatin structure will be analyzed in cells showing differential expression of the two genes. These systems offer a unique model for the study of tissue-specific, hormonal and developmental regulation of glutaminase gene expression. The results will provide valuable insights into why there are two enzymes and what their functions are in the different cell types.

谷氨酰胺在所有哺乳动物细胞中起着重要的生物合成作用。谷氨酰胺在糖尿病期间由肝脏使用，在糖尿病期间由肾脏使用。代谢性酸中毒和哺乳期乳腺，它也是一种许多快速分裂的细胞（包括癌症）的主要呼吸燃料细胞哺乳动物组织中谷氨酰胺催化剂的主要酶是磷酸活化转氨酶的两种同工酶。肝脏类型是只在成人肝脏中发现，而另一种酶（肾型）在所有其他谷氨酰胺利用组织中发现，包括胎肝和肝癌细胞所述工作的目的是表征和了解磷酸活化转氨酶的作用和调节，鼠肝这项工作源于对肝转氨酶活性的观察，在链脲佐菌素糖尿病期间增加了4倍。该酶已被纯化的，针对它的特异性抗体，并用于识别推定的cDNA。 cDNA的鉴定将通过比较来证实的DNA和氨基酸序列，杂交选择的mRNA和融合肽的分析。 cDNA将用于确定 mRNA的相对丰度和转录率对照组和糖尿病大鼠肝脏中的转氨酶基因。细胞外参与调节肝转氨酶基因表达的刺激物将使用分离的肝细胞和肝癌细胞进行鉴定。该cDNA将用于鉴定编码肝型谷氨酰胺酶和其它谷氨酰胺利用酶。的分布肝和肾型转氨酶（活性、蛋白质和mRNA）将被在不同的肝癌细胞和大鼠肝脏中，发展阶段将在细胞中分析染色质结构显示两个基因的差异表达。这些系统提供了研究组织特异性、激素和发育的独特模型转氨酶基因表达的调控。结果将提供为什么有两种酶以及它们的功能存在于不同的细胞类型中。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Characterization of the hepatic glutaminase promoter.

肝谷氨酰胺酶启动子的表征。

DOI：
10.1159/000059843
发表时间：
1997
期刊：
Contributions to nephrology
影响因子：
0
作者：
Chung-Bok,MI;Watford,M
通讯作者：
Watford,M

Hepatic glutaminase expression: relationship to kidney-type glutaminase and to the urea cycle.

肝谷氨酰胺酶表达：与肾型谷氨酰胺酶和尿素循环的关系。

DOI：
10.1096/fasebj.7.15.8262331
发表时间：
1993
期刊：
FASEB journal : official publication of the Federation of American Societies for Experimental Biology
影响因子：
0
作者：
Watford,M
通讯作者：
Watford,M

Distribution of phosphate-activated glutaminase isozymes in the chicken: absence from liver but presence of high activity in pectoralis muscle.

磷酸盐激活的谷氨酰胺酶同工酶在鸡体内的分布：肝脏中不存在，但胸肌中存在高活性。

DOI：
10.1016/s0305-0491(98)10018-4
发表时间：
1998
期刊：
Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology
影响因子：
0
作者：
Wu,G;Chung-Bok,MI;Vincent,N;Kowalski,TJ;Choi,YH;Watford,M
通讯作者：
Watford,M

Distribution of hepatic glutaminase activity and mRNA in perivenous and periportal rat hepatocytes.

静脉周围和门脉周围大鼠肝细胞中肝谷氨酰胺酶活性和 mRNA 的分布。