Role of gap junction communication in hepatocyte/fibroblast co-cultures: Implications for hepatic tissue engineering

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• 作者：Dongjoo Kim ; Yoonjae Seo ; Soonjo Kwon
• 关键词：gap junction ; cell ; cell communication ; homotypic interaction ; co ; culture ; gap junction inhibition
• 刊名：Biotechnology and Bioprocess Engineering
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：20
• 期：2
• 页码：358-365
• 全文大小：421 KB
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• 作者单位：Dongjoo Kim (1)
  Yoonjae Seo (1)
  Soonjo Kwon (1)
  
  1. Department of Biological Engineering, Inha University, Incheon, 402-751, Korea
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  
• 出版者：The Korean Society for Biotechnology and Bioengineering
• ISSN：1976-3816

文摘

The success of cell-based therapies for treatment of liver disease hinges on the phenotypic stability of isolated hepatocytes; however, primary hepatocytes rapidly lose many liver-specific functions following enzymatic isolation from the liver. Previous studies have demonstrated that liver-specific functions can be stabilized by cocultivation with non-parenchymal cells. Although the precise mechanisms underlying these effects have not yet been elucidated, it is believed that gap junctional intercellular communication plays an important role in cell-cell communication. In this study, indirect immunofluorescence was used to identify connexin 32 and 26 as homotypic gap junction proteins that were present between hepatocytes during co-culture with 3T3 fibroblasts, but not in pure hepatocyte cultures. Additionally, dye transfer of Lucifer yellow revealed that these gap junctions were functionally coupled. Although previous studies reported abundant connexin 43 expression in 3T3 fibroblasts and functional coupling by dye transfer, we did not observe heterotypic gap junction (connexin 43) expression or its functional coupling by either immunofluorescence or dye transfer. Incubation with a gap junction inhibitor, 18β-glycyrrhetinic acid, in hepatocyte co-culture diminished the level of liverspecific markers such as albumin production and P450 activity relative to control co-cultures. Overall, these findings suggest that homotypic gap junctions are present in hepatocytes co-cultured with fibroblasts and might play a functional role in homotypic hepatocyte communication. In conclusion, homotypic gap junctional communication may be important to phenotypic stability of isolated hepatocytes in co-culture and crucial to the design of tissue-engineered therapies for treatment of liver failure.