title: Expression of arachidonate platelet-type 12-lipoxygenase in human rheumatoid arthritis type B synoviocytes.
abstract: In the present study, we have demonstrated platelet-type 12-lipoxygenase (12-LOX) expression in human rheumatoid arthritis (RA) type B synoviocytes by reverse-transcription polymerase chain reaction (RT-PCR). The presence of 12-LOX mRNA in these cells was revealed by classical RT-PCR analysis using platelet-type 12-LOX cDNA primers and the PCR fragment (246 bp) was purified, amplified and sequenced. By sequence analysis, this fragment was determined to be 100% identical to that from platelet-type 12-LOX cDNA. Immunofluorescence data demonstrate that interleukin-1beta (IL-1beta) increases cellular 12-LOX protein. Other results associate specific inflammatory cytokines with the activity of 12-LOX in human RA type B synoviocytes. IL-1beta increased 12S-hydroxy-5,8,10,14-eicosatetraenoic acid (12-HETE) production (4-fold) and we also observed an increase in 12-HETE production (2.5-fold) after incubation of human RA type B synoviocytes with TNF alpha. In contrast to the action of IL-1beta on 12-HETE synthesis, IL-4 and IL-6 did not enhance 12-HETE production. This is the first demonstration of platelet-type 12-LOX cDNA derived from the mRNA of cultured human RA type B synoviocytes.
authors.affiliation: Faculté de Médecine, ERS CNRS 6101, Limoges, France.
authors.forename: B
authors.initials: B
authors.lastname: Liagre
authors.forename: P
authors.initials: P
authors.lastname: Vergne
authors.forename: M
authors.initials: M
authors.lastname: Rigaud
authors.forename: J L
authors.initials: JL
authors.lastname: Beneytout
mesh_terms: D019377:12-Hydroxy-5,8,10,14-eicosatetraenoic Acid / Q000096:biosynthesis*; D001092:Arachidonate 12-Lipoxygenase / Q000096:biosynthesis / Q000235:genetics*; D016718:Arachidonic Acid / Q000378:metabolism*; D001172:Arthritis, Rheumatoid / Q000378:metabolism* / Q000473:pathology; D001792:Blood Platelets / Q000201:enzymology; D000001:Calcimycin / Q000494:pharmacology; D002478:Cells, Cultured; D003001:Cloning, Molecular; D017931:DNA Primers; D005455:Fluorescent Antibody Technique; D015870:Gene Expression; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology; D015847:Interleukin-4 / Q000494:pharmacology; D015850:Interleukin-6 / Q000494:pharmacology; D008856:Microscopy, Fluorescence; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis; D017422:Sequence Analysis, DNA; D013583:Synovial Membrane / Q000201:enzymology* / Q000378:metabolism / Q000473:pathology; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D017931:DNA Primers; D007375:Interleukin-1; D015850:Interleukin-6; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D015847:Interleukin-4; D016718:Arachidonic Acid; D000001:Calcimycin; D019377:12-Hydroxy-5,8,10,14-eicosatetraenoic Acid; D001092:Arachidonate 12-Lipoxygenase