151. N-methylnicotinamide and nicotinamide N-methyltransferase are associated with microRNA-1291-altered pancreatic carcinoma cell metabolome and suppressed tumorigenesis.
- Author
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Bi, Hui-Chang, Pan, Yu-Zhuo, Qiu, Jing-Xin, Krausz, Kristopher W., Li, Fei, Johnson, Caroline H., Jiang, Chang-Tao, Gonzalez, Frank J., and Yu, Ai-Ming
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NEOPLASTIC cell transformation , *NICOTINAMIDE nucleotides , *METHYLTRANSFERASES , *PANCREATIC cancer , *CELL physiology , *MICRORNA , *LABORATORY mice , *MASS spectrometry - Abstract
This study reveals an association of NNMT with microRNA-1291-altered pancreatic cell metabolome and tumorigenesis in xenograft tumor mouse models.The cell metabolome comprises abundant information that may be predictive of cell functions in response to epigenetic or genetic changes at different stages of cell proliferation and metastasis. An unbiased ultra-performance liquid chromatography–mass spectrometry-based metabolomics study revealed a significantly altered metabolome for human pancreatic carcinoma PANC-1 cells with gain-of-function non-coding microRNA-1291 (miR-1291), which led to a lower migration and invasion capacity as well as suppressed tumorigenesis in a xenograft tumor mouse model. A number of metabolites, including N-methylnicotinamide, involved in nicotinamide metabolism, and l-carnitine, isobutyryl-carnitine and isovaleryl-carnitine, involved in fatty acid metabolism, were elevated in miR-1291-expressing PANC-1. Notably, N-methylnicotinamide was elevated to the greatest extent, and this was associated with a sharp increase in nicotinamide N-methyltransferase (NNMT) mRNA level in miR-1291-expressing PANC-1 cells. In addition, expression of NNMT mRNA was inversely correlated with pancreatic tumor size in the xenograft mouse model. These results indicate that miR-1291-altered PANC-1 cell function is associated with the increase in N-methylnicotinamide level and NNMT expression, and in turn NNMT may be indicative of the extent of pancreatic carcinogenesis. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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