title: Vitamin C exacerbates hydrogen peroxide induced apoptosis and concomitant PGE2 release in amnion epithelial and mesenchymal cells, and in intact amnion.
abstract: This study was undertaken to investigate the effect of hydrogen peroxide (HP), a reactive oxygen species, and vitamin C, an antioxidant, on apoptosis and prostaglandin (PGE(2)) release in human amnion epithelial and mesenchymal cells, and intact amnion. Amnion cells and explants were incubated with and without HP and vitamin C. Cytoproliferation assay for viability, DNA fragmentation and PARP cleavage for apoptosis, EIA for PGE(2), and western blots for cyclooxygenases (COX) were performed. In amnion cells and explants, HP (0-5 mm) induced dose dependent apoptosis as per DNA fragmentation and PARP cleavage. HP (0-0.5 mm) also induced PGE(2)release concomitant with apoptosis in both cell types. In amnion explants, HP (0-10 mm) induced COX-2 protein and PGE(2)release concomitant with apoptosis. Vitamin C (0.01-10 mm), alone, enhanced epithelial but inhibited mesenchymal cell viability. It induced PGE(2)release in amnion explants. Vitamin C (1 mm) failed to inhibit HP induced apoptosis, but instead exacerbated it in epithelial and mesenchymal cells, and amnion explants. Vitamin C (0-10 mm) enhanced HP induced PGE(2)in mesenchymal cells. HP induces concomitant apoptosis and PGE(2)release in amnion epithelial and mesenchymal cells, and in intact amnion explants. HP induced apoptosis is not inhibited but enhanced by vitamin C.
authors.affiliation: Department of Pediatrics, MetroHealth Medical Center (MHMC), Case Western Reserve University (CWRU), Room 249-Old Research Building 25, Cleveland, OH 44109, USA.
authors.forename: D
authors.initials: D
authors.lastname: Kumar
authors.forename: R M
authors.initials: RM
authors.lastname: Moore
authors.forename: M
authors.initials: M
authors.lastname: Elkhwad
authors.forename: R J
authors.initials: RJ
authors.lastname: Silver
authors.forename: J J
authors.initials: JJ
authors.lastname: Moore
mesh_terms: D000650:Amnion / Q000166:cytology / Q000187:drug effects* / Q000502:physiology; D017209:Apoptosis / Q000187:drug effects*; D001205:Ascorbic Acid / Q000494:pharmacology*; D002478:Cells, Cultured; D051546:Cyclooxygenase 2; D053938:DNA Fragmentation; D015232:Dinoprostone / Q000378:metabolism*; D004847:Epithelial Cells / Q000166:cytology / Q000187:drug effects / Q000502:physiology; D005260:Female; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D007527:Isoenzymes / Q000378:metabolism; D008565:Membrane Proteins; D008648:Mesoderm / Q000166:cytology / Q000187:drug effects / Q000502:physiology; D011247:Pregnancy; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism; D046509:Tissue Culture Techniques
chemical_list: D007527:Isoenzymes; D008565:Membrane Proteins; D006861:Hydrogen Peroxide; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D015232:Dinoprostone; D001205:Ascorbic Acid