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- W4241306989 abstract "The capacity to convert exogenous leukotriene A4 to lipoxins (LXs) was investigated in platelet suspensions from patients with myeloproliferative disorders (MPD) (n = 22) and healthy control subjects (n = 14). Platelets isolated from the controls produced mainly LXA4, but also 6(S)-LXA4 and the all-trans isomers of lipoxins A4 and B4, as determined by high-performance liquid chromatography and computerized UV spectroscopy. In comparison to control levels, the mean LX synthesis was significantly lower in platelets from the MPD patients (438.7 +/- 62.8 and 157.4 +/- 31.2 pmol LXA4 per 10(9) platelets, respectively; mean +/- SEM; P = .0001). Platelets from six of the patients showed a particularly low capacity to produce LXs, resulting in LX levels below the detection limit or less than 7% of mean control levels. Notably, all these patients were in blastic crisis of chronic myelogenous leukemia (CML). This severely deficient LX production was paralleled by a dramatically attenuated conversion of arachidonic acid to 12-HETE (12-hydroxyheptadecatrienoic acid), a product formed via the prostaglandin endoperoxide synthase pathway, was normal. In addition, longitudinal studies of CML patients showed that blastic metamorphosis was associated with a markedly reduced capability to synthesize LXs, while this capacity improved after retransformation into a second chronic phase. The results reveal deficient LX synthesis as a novel platelet dysfunction in MPD, particularly in blastic crisis of CML in which an essentially abolished 12-lipoxygenase activity may be a general phenomenon." @default.
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- W4241306989 date "1991-12-01" @default.
- W4241306989 modified "2023-09-29" @default.
- W4241306989 title "Deficient lipoxin synthesis: a novel platelet dysfunction in myeloproliferative disorders with special reference to blastic crisis of chronic myelogenous leukemia" @default.
- W4241306989 doi "https://doi.org/10.1182/blood.v78.11.2989.bloodjournal78112989" @default.
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