title: Induction of thromboxane A2 synthesizing enzymes in DMSO-induced granulocytic differentiation of HL-60 cells.
abstract: Human leukemia (HL)-60 cells were differentiated by several agents, and prostaglandins (PGs) and thromboxane (TX) synthesizing activity increased in response to the differentiation of the cells. We examined the expression of messenger RNA (mRNA) for TX-synthesizing enzymes, cyclooxygenase (COX)-1, COX-2 and TXA(2) synthase, in dimethyl sulfoxide (DMSO)-differentiated HL-60 cells by reverse transcriptase polymerase chain reaction (RT-PCR), and A23187-stimulated TXB(2) production, a stable metabolite of TXA(2), by radioimmunoassay (RIA). A23187-stimulated TXB(2) production, and mRNA abundance for COX-2, were not detected in non-treated HL-60 cells. TXA(2) synthase mRNA were barely detected in non-treated HL-60 cells. DMSO-induced HL-60 cells gained induction of TXB(2) synthesis and mRNA for COX-2 and TXA(2) synthase during granulocytic differentiation. COX-1 mRNA was constitutively expressed. A23187-stimulated TXB(2) production in DMSO-treated cells was inhibited by NS-398, a specific COX-2 inhibitor. These results demonstrated that TXB(2) production in granulocytic HL-60 cells was regulated at both the enzyme level of COX-2 and TXA(2) synthase.
authors.affiliation: Department of Pediatrics, Saga Medical School, Saga, Japan. zaitsum@post.saga-med.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Zaitsu
authors.forename: E
authors.initials: E
authors.lastname: Ishii
authors.forename: Y
authors.initials: Y
authors.lastname: Hamasaki
mesh_terms: D001241:Aspirin / Q000494:pharmacology; D002454:Cell Differentiation / Q000187:drug effects*; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D004121:Dimethyl Sulfoxide / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004790:Enzyme Induction / Q000187:drug effects; D018922:HL-60 Cells; D006801:Humans; D007527:Isoenzymes / Q000235:genetics; D008565:Membrane Proteins; D009578:Nitrobenzenes / Q000494:pharmacology; D011451:Prostaglandin-Endoperoxide Synthases / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D013449:Sulfonamides / Q000494:pharmacology; D013928:Thromboxane A2 / Q000096:biosynthesis*; D013929:Thromboxane B2 / Q000096:biosynthesis; D013930:Thromboxane-A Synthase / Q000235:genetics; D013997:Time Factors
chemical_list: D007527:Isoenzymes; D008565:Membrane Proteins; D009578:Nitrobenzenes; D012333:RNA, Messenger; D013449:Sulfonamides; C080955:N-(2-cyclohexyloxy-4-nitrophenyl)methanesulfonamide; D013929:Thromboxane B2; D013928:Thromboxane A2; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; C496511:PTGS1 protein, human; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D013930:Thromboxane-A Synthase; D001241:Aspirin; D004121:Dimethyl Sulfoxide