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- W1539063815 abstract "Prostaglandin D synthetase activity in the cytosol (100,000 x g, 1-h supernatant) fraction of peritoneal mast cells of adult rats (105.0 nmol/min/mg protein) was the highest among such activities in various rat tissues and cells. As judged by the absolute requirement for glutathione for the reaction (Km = 300 microM), the Km value for prostaglandin H2 (200 microM), and insensitivity of the activity to 1 mM 1-chloro-2,4-dinitrobenzene, the enzyme in mast cells was similar to rat spleen prostaglandin D synthetase and differed from rat brain prostaglandin D synthetase or glutathione S-transferase, all of which catalyze the isomerase reaction from prostaglandin H2 to prostaglandin D2. In immunotitration analyses, the activity in mast cells showed a titration curve exactly identical with that of the purified spleen-type enzyme and almost completely absorbed by an excess amount of antibody against this enzyme, but it remained unchanged after incubation with antibodies against the brain-type enzyme and glutathione S-transferase isozymes thus far purified. In Western blot after two-dimensional electrophoresis of crude extracts of mast cells, a single immunoreactive spot was observed with antibody against the spleen-type enzyme at the same position as that of the purified enzyme (Mr = 26,000, pI = 5.2). Furthermore, the immunoreactive protein obtained from mast cells showed the same peptide fingerprints as those of the purified spleen-type enzyme, after partial digestion with Staphylococcus aureus V8 protease or trypsin. In immunoperoxidase staining, the immunoreactivity of the spleen-type enzyme was found in the cytosol of tissue mast cells in various organs such as thymus, intestine, stomach, and skin of adult rats. These findings indicate that prostaglandin D2 is produced by the spleen-type synthetase in mast cells of various tissues." @default.
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- W1539063815 date "1990-01-01" @default.
- W1539063815 modified "2023-09-30" @default.
- W1539063815 title "Mast cells contain spleen-type prostaglandin D synthetase." @default.
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- W1539063815 doi "https://doi.org/10.1016/s0021-9258(19)40239-1" @default.
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