Heregulin Beta 1 Enhances Nuclear Localization of BRCA1

Heregulin Beta 1 增强 BRCA1 的核定位

• 批准号: 6788748
• 负责人: Cimona V Hinton
• 金额: $ 2.74万
• 依托单位: MEHARRY MEDICAL COLLEGE
• 依托单位国家: 美国
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2005-05-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6788748
• 关键词: MCF7 cell; brca gene; enzyme activity; enzyme inhibitors; extracellular matrix proteins; heregulin; immunocytochemistry; neuregulins; phosphatidylinositol 3 kinase; phosphorylation; predoctoral investigator; protein localization; serine threonine protein kinase; site directed mutagenesis

DESCRIPTION (provided by applicant): Heregulin (HRG) is a growth factor that regulates growth, differentiation, and survival. Heregulin stimulates signaling pathways through direct binding to the ErbB receptors. Signaling pathways that are downstream targets of heregulin include the Ras/ERK pathway, and the PI3K/Akt pathway. Altiok et al demonstrated that when breast cancer cells are treated with heregulin, BRCA1 is phosphorylated through the PI3K/AKT pathway (Altiok, et al). BRCA1 is a cell cycle-regulated tumor suppressor that is phosphorylated at multiple amino acids. It has been reported that phosphorylation of BRCA1 in response to DNA damage changes the subcellular localization state of the protein (Ruffner, et al. 1999). However, the effects of phosphorylation of BRCA1 induced by a growth factor on its subcellular localization have not been investigated. Therefore, this project will test the correlation of phosphorylation of BRCA1 by PI3K/Akt and subcellular localization. The hypothesis is: Heregulin- beta1 enhances BRCA1 nuclear localization through the PI3K/Akt pathway.

描述（由申请人提供）：此处糖蛋白（HRG）是调节生长，分化和生存的生长因素。这里调节蛋白通过直接结合ERBB受体刺激信号通路。是这里调节蛋白下游目标的信号通路包括RAS/ERK途径和PI3K/AKT途径。 Altiok等人证明，当乳腺癌细胞用这里糖蛋白治疗时，BRCA1通过PI3K/AKT途径磷酸化（Altiok等人）。 BRCA1是一种细胞周期调节的肿瘤抑制，在多个氨基酸下磷酸化。据报道，BRCA1响应DNA损伤的磷酸化会改变蛋白质的亚细胞定位状态（Ruffner等，1999）。然而，尚未研究由生长因子诱导的BRCA1磷酸化对其亚细胞定位的影响。因此，该项目将通过PI3K/AKT和亚细胞定位测试BRCA1磷酸化的相关性。该假设是：固定蛋白β1通过PI3K/AKT途径增强了BRCA1核定位。