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J. Biol. Chem., Vol. 263, Issue 31, 16051-16054, Nov, 1988

Purification and identification of [hydroxyprolyl3]bradykinin in ascitic fluid from a patient with gastric cancer

H Maeda, Y Matsumura and H Kato
Department of Microbiology, Kumamoto University Medical School, Japan.

Kinins in the ascitic fluid from a patient with gastric cancer were purified by gel filtration and reversed-phase high-performance liquid chromatography (HPLC). Two fractions (fractions I and II) showed kinin activity. Fraction I did not correspond to either bradykinin or other known kinins, whereas fraction II corresponded to bradykinin. Fraction I contained 8 amino acid residues from bradykinin minus 1 proline plus 1 additional hydroxyproline. Sequence analysis of fraction I showed that the proline at the third amino acid residue of bradykinin was replaced by hydroxyproline. The retention time of fraction I on reversed-phase HPLC was exactly the same as that of synthetic [hydroxyprolyl3]bradykinin (Arg-Pro-Hyp-Gly-Phe-Ser-Pro-Phe-Arg) and was distinguishable from des-Pro3-bradykinin. Thus, these results demonstrate for the first time the presence of [hydroxyprolyl3]bradykinin in vivo. This is also the first report of the presence of bradykinin in human tumor ascites.
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