Suppression of Grb2 expression improved hepatic steatosis, oxidative stress, and apoptosis induced by palmitic acid in vitro partly through insulin signaling alteration

详细信息    查看全文

• 作者：Xiangxiang Shan (1)
  Yufeng Miao (2)
  Rengen Fan (3)
  Changzhi Song (4)
  Guangzhou Wu (5)
  Zhengqiang Wan (6)
  Jian Zhu (6)
  Guan Sun (6)
  Wenzhang Zha (3)
  Xiangming Mu (3)
  Guangjun Zhou (3)
  Yan Chen (3)
  
• 关键词：Grb2 ; HepG2 ; Steatosis ; Apoptosis ; Insulin signaling
• 刊名：In Vitro Cellular & Developmental Biology - Animal
• 出版年：2013
• 出版时间：September 2013
• 年：2013
• 卷：49
• 期：8
• 页码：576-582
• 全文大小：
• 作者单位：Xiangxiang Shan (1)
  Yufeng Miao (2)
  Rengen Fan (3)
  Changzhi Song (4)
  Guangzhou Wu (5)
  Zhengqiang Wan (6)
  Jian Zhu (6)
  Guan Sun (6)
  Wenzhang Zha (3)
  Xiangming Mu (3)
  Guangjun Zhou (3)
  Yan Chen (3)
  
  1. Department of Geraeology, Yancheng City No. 1 People? Hospital, Yancheng, 224001, China
  2. Department of Medical Oncology, Yancheng City No. 1 People? Hospital, Yancheng, 224001, China
  3. Department of General Surgery, Yancheng City No. 1 People? Hospital, Yancheng, 224001, China
  4. Department of Orthopaedics, Yancheng City No. 1 People? Hospital, Yancheng, 224001, China
  5. Department of Thoracic Surgery, Yancheng City No. 1 People? Hospital, Yancheng, 224001, China
  6. Department of Neurosurgery, Yancheng City No. 1 People? Hospital, Yancheng, 224001, China
  
• ISSN：1543-706X

文摘

In this study, we aimed to study the role of growth factor receptor-bound protein 2 (Grb2) in palmitic acid-induced steatosis and other ?atty liver?symptoms in vitro. HepG2 cells, with or without stably suppressed Grb2 expression, were incubated with palmitic acid for 24?h to induce typical clinical ?atty liver?features, including steatosis, impaired glucose metabolism, oxidative stress, and apoptosis. MTT and Oil Red O assays were applied to test cell viability and fat deposition, respectively. Glucose uptake assay was used to evaluate the glucose utilization of cells. Quantitative polymerase chain reaction and Western blot were used to measure expressional changes of key markers of insulin signaling, lipid/glucose metabolism, oxidative stress, and apoptosis. After 24-h palmitic acid induction, increased fat accumulation, reduced glucose uptake, impaired insulin signaling, enhanced oxidative stress, and increased apoptosis were observed in HepG2 cells. Suppression of Grb2 in HepG2 significantly reduced fat accumulation, improved glucose metabolism, ameliorated oxidative stress, and restored the activity of insulin receptor substrate-1/Akt and MEK/ERK pathways. In addition, Grb2 deficiency attenuated hepatic apoptosis shown by reduced activation of caspase-3 and fluorescent staining. Modulation of Bcl-2 and Bak1 also contributed to reduced apoptosis. In conclusion, suppression of Grb2 expression in HepG2 cells improved hepatic steatosis, glucose metabolism, oxidative stress, and apoptosis induced by palmitic acid incubation partly though modulating the insulin signaling pathway.