首页    期刊浏览 2024年11月06日 星期三
登录注册

文章基本信息

  • 标题:Insulin regulation of protein phosphorylation in isolated rat liver nuclear envelopes: potential relationship to mRNA metabolism
  • 本地全文:下载
  • 作者:F Purrello ; D B Burnham ; I D Goldfine
  • 期刊名称:Proceedings of the National Academy of Sciences
  • 印刷版ISSN:0027-8424
  • 电子版ISSN:1091-6490
  • 出版年度:1983
  • 卷号:80
  • 期号:5
  • 页码:1189-1193
  • DOI:10.1073/pnas.80.5.1189
  • 语种:English
  • 出版社:The National Academy of Sciences of the United States of America
  • 摘要:The direct addition of insulin to highly purified nuclear envelopes prepared from the livers of diabetic rats resulted in a decrease in the incorporation of 32P into trichloroacetic acid-precipitable proteins. Autoradiography of 32P-labeled envelopes, solubilized in sodium dodecyl sulfate and subjected to electrophoresis, revealed that insulin decreased the phosphorylation of all major protein bands. Insulin produced detectable effects at concentrations between 0.1 and 1 pM, maximal effects at 10 pM, and progressively diminished effects at higher concentrations. Two insulin analogs, desdipeptide proinsulin and desoctapeptide insulin, had approximately 10% and 1%, respectively, the activity of native insulin. When nuclear envelopes were first phosphorylated with [gamma-32P]ATP and insulin was then added with an excess of unlabeled ATP, dephosphorylation was enhanced, suggesting that insulin was regulating nuclear envelope phosphatase activity. The direct addition of insulin to isolated rat liver nuclei in the presence of ATP stimulated the release of previously 14C-labeled trichloroacetic acid-precipitable mRNA-like material, and the direct addition of insulin to nuclear envelopes stimulated the activity of nucleoside triphosphatase, the enzyme that participates in mRNA nucleocytoplasmic transport. Moreover, the dose-response curves for these functions mirrored insulin's inhibition of nuclear envelope phosphorylation. These data suggest, therefore, a mechanism whereby insulin directly inhibits the phosphorylation of the nuclear envelope, leading in turn to the regulation of mRNA metabolism.
国家哲学社会科学文献中心版权所有