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Inhibition of Farnesyl Protein Transferase, H-ras Oncogene Expression and P21rasMembrane Association by Natural Products in Human Solid Tumor Cell Lines

 

作者: XiaoGuang Chen,   Otani Shuzo,   Yan Li,   Rui Han,  

 

期刊: Journal of Asian Natural Products Research  (Taylor Available online 1998)
卷期: Volume 1, issue 1  

页码: 29-51

 

ISSN:1028-6020

 

年代: 1998

 

DOI:10.1080/10286029808039842

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

Ras proteins must be isoprenylated at a conserved cysteine residue near the carboxyl terminus (Cys-186 in mammalian Ras P21proteins) in order to extend their biological activity. Previous studies indicated that an intermediate in mevalonate pathway, most likely farnesyl pyrophosphate, is the donor of this isoprenyl group, that using inhibitors of the mevalonate pathway could block the transforming properties of ras oncogene. Unfortunately, mevalonate is the precursor of various end products essential to mammalian cells, such as dolichols, ubiquinones, heme A, and cholesterol. In this study, we partially purified farnesyl protein transferase (FPTase) capable of catalyzing the farnesylation of unprocessed Ras P21proteinsin vitrofrom porcine kidney epithelial-like LLC-PK1 cells, human lung adenocarcinoma A549 cells and human pancreatic cancer MIA PaCa-2 cells. We observed the effects of the monoterpene compound, d-limonene (1); turmeric derivatives, TD-I (2) and TD-II (3); polyphenol compound, gallotannin; salviol derivative, SMD; and retinoid acid derivative, RAD on FPTase activity. We found that turmeric derivatives and gallotannin had a strong inhibition on FPTase besides d-limonene, while gallotannin was the strongest among synthetic and natural compounds tested. Saliviol and retinoid acid derivatives had no influence on FPTase activity. Our results suggest that compounds containing polyphenol hydroxyl may be a new source of FPTase inhibitors. The experiment also showed that availability of anin vitroFPTase assay could be useful in screening for potential inhibitors of ras oncogene function that will not interfere with other aspects of the mevalonate pathway.

 

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