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GENE EXPRESSION AND PROTEIN DISTRIBUTION OF INTER-ALPHA-TRYPSIN INHIBITOR IN THREE HUMAN HEPATOMA CELL LINES

机译:三种胰岛胰蛋白酶抑制剂之间基因表达和蛋白质分布

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摘要

In standard culture conditions, three human hepatoma cell lines, Hep3B, PLC/PRF/5 and HepG2, were characterised by a predominant transcription of only two (H2 and L) among the four genes involved in the synthesis of inter-alpha-trypsin inhibitor (ITI)-related proteins. Pulse-chase experiments followed by immunoprecipitation with specific anti-L and anti-H ITI antisera showed that the proteins synthesised displayed a restricted L and/or H2 antigenic reactivity. Furthermore, while Hep3B and PLC/PRF/5 lines only synthesised ITI precursors (mainly the L-form), HepG2 cells were able to secrete art ITI-like protein. Immunocytochemical analyses substantiated these results with uneven distribution of heavy and light-chain polypeptide reactivity among the cells. The use of hepatoma cell models for the study of protein synthesis and assembly must therefore be considered cautiously.
机译:在标准培养条件下,三种人类肝癌细胞系Hep3B,PLC / PRF / 5和HepG2的特征在于,参与α-胰蛋白酶抑制剂合成的四个基因中只有两个主要转录(H2和L) (ITI)相关蛋白。脉冲追踪实验,然后用特定的抗L和抗H ITI抗血清进行免疫沉淀,表明合成的蛋白质显示出受限的L和/或H2抗原反应性。此外,尽管Hep3B和PLC / PRF / 5系仅合成了ITI前体(主要是L型),但HepG2细胞却能够分泌ITI类蛋白。免疫细胞化学分析证实了这些结果,使细胞之间的重链和轻链多肽反应性分布不均。因此,必须谨慎考虑使用肝癌细胞模型进行蛋白质合成和组装研究。

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