Activation of telomerase and cyclooxygenase-2 in PDGF and FGF inhibition of C2-ceramide-induced apoptosis

Chih Chiang Chien, Shing Chuan Shen, Liang Yo Yang, Chin Yen Wu, Jiun Shiang Liau, Yen Chou Chen

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Abstract

In the present study, the roles of telomerase and prostaglandin E 2 (PGE2) in platelet-derived growth factor (PDGF's) and fibroblast growth factor-2 (FGF-2's) effects against C2-ceramide- induced cell death were investigated. C2-ceramide reduced the viability of NIH3T3 cells in a condition without calf serum (CS) in accordance with decreasing telomerase activity according to the TRAP assay. The addition of CS significantly protected cells from C2-ceramide-induced apoptosis through increased telomerase activity, and the phosphorylations of PDGF and the FGF-2-like receptor in NIH3T3 cells were detected. Adding PDGF and FGF-2 decreased the cytotoxic effect elicited by C2-ceramide through stimulating telomerase activity, which was blocked by adding a telomerase inhibitor (TI). Activations of ERKs and JNKs were detected in PDGF- and FGF-2-treated NIH3T3 cells, and the telomerase activities induced by PDGF and FGF were respectively inhibited by the addition of the ERK inhibitor, PD98059, and the JNK inhibitor, SP600125. Accordingly, induction of cyclooxygenase-2 (COX-2) protein expression and PGE2 production was detected in PDGF- and FGF-2-treated NIH3T3 cells, and the telomerase activities stimulated by PDGF and FGF were reduced by adding a specific COX-2 inhibitor, NS398, through a decrease in PGE2 production. Incubation of cells with PGE2 or the EP1 agonist, 17-PT, but not the EP2 agonist, sulprostone, the EP3 agonist, butaprost, or the EP4 agonist, PGE1 alcohol, significantly enhanced the telomerase activity of NIH3T3 cells. PGE2 protection of NIH3T3 cells against C2-ceramide-induced cell death was identified by the MTT and LDH-release assays, and it was inhibited by adding the EP1 antagonist, SC-19220. Ceramide metabolites including ceramide-1-phosphate (C1P) and sphingosine-1-phosphate (S1P), and a standard control of exogenous ceramide C2-dihydroceramide show no effect on the telomerase activity and viability of NIH3T3 cells. The involvement of COX-2/PGE2-mediated telomerase activation by PDGF and FGF-2 against C2-ceramide-induced cell death is first demonstrated herein.

Original languageEnglish
Pages (from-to)405-415
Number of pages11
JournalJournal of Cellular Physiology
Volume218
Issue number2
DOIs
Publication statusPublished - Feb 2009

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Telomerase
Platelet-Derived Growth Factor
Cyclooxygenase 2
Chemical activation
Fibroblast Growth Factor 2
Apoptosis
Prostaglandins E
Cell death
Cell Death
Ceramides
Dibenz(b,f)(1,4)oxazepine-10(11H)-carboxylic acid, 8-chloro-, 2-acetylhydrazide
Assays
Cell Survival
N-acetylsphingosine
Phosphorylation
Cytoprotection
Cyclooxygenase 2 Inhibitors
Alprostadil
Metabolites
Serum

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Cell Biology
  • Physiology

Cite this

Activation of telomerase and cyclooxygenase-2 in PDGF and FGF inhibition of C2-ceramide-induced apoptosis. / Chien, Chih Chiang; Shen, Shing Chuan; Yang, Liang Yo; Wu, Chin Yen; Liau, Jiun Shiang; Chen, Yen Chou.

In: Journal of Cellular Physiology, Vol. 218, No. 2, 02.2009, p. 405-415.

Research output: Contribution to journalArticle

Chien, Chih Chiang ; Shen, Shing Chuan ; Yang, Liang Yo ; Wu, Chin Yen ; Liau, Jiun Shiang ; Chen, Yen Chou. / Activation of telomerase and cyclooxygenase-2 in PDGF and FGF inhibition of C2-ceramide-induced apoptosis. In: Journal of Cellular Physiology. 2009 ; Vol. 218, No. 2. pp. 405-415.
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abstract = "In the present study, the roles of telomerase and prostaglandin E 2 (PGE2) in platelet-derived growth factor (PDGF's) and fibroblast growth factor-2 (FGF-2's) effects against C2-ceramide- induced cell death were investigated. C2-ceramide reduced the viability of NIH3T3 cells in a condition without calf serum (CS) in accordance with decreasing telomerase activity according to the TRAP assay. The addition of CS significantly protected cells from C2-ceramide-induced apoptosis through increased telomerase activity, and the phosphorylations of PDGF and the FGF-2-like receptor in NIH3T3 cells were detected. Adding PDGF and FGF-2 decreased the cytotoxic effect elicited by C2-ceramide through stimulating telomerase activity, which was blocked by adding a telomerase inhibitor (TI). Activations of ERKs and JNKs were detected in PDGF- and FGF-2-treated NIH3T3 cells, and the telomerase activities induced by PDGF and FGF were respectively inhibited by the addition of the ERK inhibitor, PD98059, and the JNK inhibitor, SP600125. Accordingly, induction of cyclooxygenase-2 (COX-2) protein expression and PGE2 production was detected in PDGF- and FGF-2-treated NIH3T3 cells, and the telomerase activities stimulated by PDGF and FGF were reduced by adding a specific COX-2 inhibitor, NS398, through a decrease in PGE2 production. Incubation of cells with PGE2 or the EP1 agonist, 17-PT, but not the EP2 agonist, sulprostone, the EP3 agonist, butaprost, or the EP4 agonist, PGE1 alcohol, significantly enhanced the telomerase activity of NIH3T3 cells. PGE2 protection of NIH3T3 cells against C2-ceramide-induced cell death was identified by the MTT and LDH-release assays, and it was inhibited by adding the EP1 antagonist, SC-19220. Ceramide metabolites including ceramide-1-phosphate (C1P) and sphingosine-1-phosphate (S1P), and a standard control of exogenous ceramide C2-dihydroceramide show no effect on the telomerase activity and viability of NIH3T3 cells. The involvement of COX-2/PGE2-mediated telomerase activation by PDGF and FGF-2 against C2-ceramide-induced cell death is first demonstrated herein.",
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