Modulation of nitric oxide-induced apoptotic death of HL-60 cells by protein kinase C and protein kinase A through mitogen-activated protein kinases and CPP32-like protease pathways.
To define the signaling pathways during NO-induced apoptotic events and their possible modulation by two protein kinase systems, we explored the involvement of three structurally related mitogen-activated protein kinase subfamilies. Exposure of HL-60 cells to sodium nitroprusside (SNP) strongly activated p38 kinase, but did not activate c-Jun N-terminal kinase (JNK) and extracellular signal-regulated kinase (ERK). In addition, SNP-induced apoptosis was markedly blocked by the selective p38 kinase inhibitor (SB203580) but not by MEK1 kinase inhibitor (PD098059), indicating that p38 kinase serves as a mediator of NO-induced apoptosis. In contrast, treatment of cells with phorbol 12-myristate 13-acetate (PMA) strongly activated not only JNK but also ERK, while not affecting p38 kinase. However, although SNP by itself weakly activated CPP32-like protease, SNP in combination with PMA markedly increased the extent of CPP32-like protease activation. Interestingly, N6,O2-dibutylyl cAMP (DB-cAMP) significantly blocked SNP- or SNP plus PMA-induced activation of CPP32-like protease and the resulting induction of apoptosis. DB-cAMP also blocked PMA-induced JNK activation. Collectively, these findings demonstrate the presence of specific up- or down-modulatory mechanisms of cell death pathway by NO in which (1) p38 kinase serves as a mediator of NO-induced apoptosis, (2) PKC acts at the point and/or upstream of JNK and provides signals to potentiate NO-induced CPP32-like protease activation, and (3) PKA lies upstream of either JNK or CPP32-like protease to protect NO- or NO plus PMA-induced apoptotic cell death in HL-60 cells.
Jun
C D
CD
Department of Microbiology and Immunology, Wonkwang University School of Medicine and Medicinal Resources Research Center of Wonkwang University, Chonbuk, Iksan. cdjun@wonnms.wonkwang.ac.kr
Pae
H O
HO
Kwak
H J
HJ
Yoo
J C
JC
Choi
B M
BM
Oh
C D
CD
Chun
J S
JS
Paik
S G
SG
Park
Y H
YH
Chung
H T
HT
D017209:Apoptosis; D003994:Bucladesine / Q000494:pharmacology; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism*; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism*; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism*; D004789:Enzyme Activation; D018922:HL-60 Cells; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; D008934:Mitogens / Q000494:pharmacology; D009569:Nitric Oxide / Q000378:metabolism*; D009599:Nitroprusside / Q000494:pharmacology; D011493:Protein Kinase C / Q000378:metabolism*; D015398:Signal Transduction; D013755:Tetradecanoylphorbol Acetate / Q000378:metabolism / Q000494:pharmacology; D048051:p38 Mitogen-Activated Protein Kinases
D008934:Mitogens; D009599:Nitroprusside; D009569:Nitric Oxide; D003994:Bucladesine; D017868:Cyclic AMP-Dependent Protein Kinases; D011493:Protein Kinase C; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D048031:JNK Mitogen-Activated Protein Kinases; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; C505407:CASP3 protein, human; D053148:Caspase 3; D020169:Caspases; D013755:Tetradecanoylphorbol Acetate