Márquez J, Matés JM, Quesada AR, Medina MA, Núñez de Castro I, Sánchez-Jiménez F. Altered ornithine metabolism in tumor-bearing mice.
Life Sci 1989;
45:1877-84. [PMID:
2601556 DOI:
10.1016/0024-3205(89)90541-9]
[Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A flux of ornithine from the host tissues to the tumor was deduced from the concentrations of ornithine in plasma, ascitic liquid, liver and tumor cells during tumor growth. The activities of arginase and ornithine decarboxylase in both liver and tumor cells confirmed this proposed ornithine supply. Moreover, "in vitro" incubations of tumor cells showed that glutamine could be an additional source of ornithine for tumors. Finally, shortly before death, when tumor cell proliferation had ceased, altered hepatic ornithine metabolism was also detected.
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