Hydrogen peroxide-induced phospholipase D-2 activation in lymphocytic leukemic L1210 cells
SCIE
SCOPUS
- Title
- Hydrogen peroxide-induced phospholipase D-2 activation in lymphocytic leukemic L1210 cells
- Authors
- Lee, BD; Kim, JH; Lee, SD; Kim, Y; Suh, PG; Ryu, SH
- Date Issued
- 2000-05
- Publisher
- FEDERATION AMER SOC EXP BIOL
- Abstract
- Extracellular hydrogen peroxide (H2O2) has been implicated in the activation of phospholipase D (PLD), However, it was still unclear how this activation occurs and what the molecular identity of the H2O2-stimulated PLD isozyme is. This study shows that H2O2: potently increases the PLD activity in mouse lymphocytic leukemic L1210 cells, which contain exclusively PLD2, In addition, H2O2 increased PLD activity only in PLD2-transfected COS-7 cells and not in PLD1-transfected cells, This suggests that PLD2 is selectively activated by H2O2 Depletion of extracellular Ca2+ with EGTA completely blocked the H2O2-induced PLD activation, indicating that Ca2+ influx is required. Moreover, pretreatment of the cells with the protein kinase C (PKC) inhibitors GF-109203X and RO-31-8220 and down-regulation of PKC alpha by prolonged treatment with 4 beta-phorbol 12-myristate 13-acetate inhibited the H2O2-stimulated PLD2 activity, which points to the involvement of PKC alpha. Based on these new findings we suggest that PLD2 activity is specifically up-regulated by H2O2 and that the H2O2-induced PLD2 activation is mediated by Ca2+ influx and PKC alpha activation.
- Keywords
- calcium; protein kinase C; PROTEIN-KINASE-C; TYROSINE PHOSPHORYLATION; HUMAN NEUTROPHILS; 3T3 FIBROBLASTS; FATTY-ACID; D1; D2; INVOLVEMENT; MECHANISMS; HYDROLYSIS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19948
- DOI
- 10.1002/jlb.67.5.630
- ISSN
- 0741-5400
- Article Type
- Article
- Citation
- JOURNAL OF LEUKOCYTE BIOLOGY, vol. 67, no. 5, page. 630 - 636, 2000-05
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