Induction of p21Waf1/Cip1 by garcinol via downregulation of p38-MAPK signaling in p53-independent H1299 lung cancer

Sheng Yung Yu, Chiung Ho Liao, Ming Hsien Chien, Tsung Yu Tsai, Jen Kun Lin, Meng Shih Weng

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Abstract

Garcinol, a polyisoprenylated benzophenone, from Garcinia indica fruit rind has possessed anti-inflammatory, antioxidant, antiproliferation, and anticancer activities. However, the anticancer mechanisms of garcinol in lung cancer were still unclear. Therefore, we examine the effects of garcinol on antiproliferation in human lung cancer cells. Treatments with garcinol for 24 h exhibited morphological changes and inhibited the proliferation of H460 (p53-wild type) and H1299 (p53-null) cells in dose-and time-dependent manners. Furthermore, a significant G1 cell cycle arrest was observed in a dose-dependent treatment after H1299 cells were exposed in garcinol, whereas garcinol induced apoptosis rather than cell cycle arrest in H460 cells. Moreover, cyclin-dependent kinase 2 (CDK2), cyclin-dependent kinase 4 (CDK4), cyclin D1, and cyclin D3 were decreased, although cyclin E and cyclin-dependent kinase 6 (CDK6) were increased in garcinol-treated H1299 cells. Meanwhile, the protein levels of CDK inhibitors p21Waf1/Cip1 and p27KIP1 also exhibited upregulation after garcinol treatments. The enhanced protein-associated level between p21Waf1/Cip1 and CDK4/2 rather than p27KIP1 and CDK4/2 was demonstrated in garcinol-treated cells. Additionally, knock-down p21Waf1/Cip1 by specific siRNA competently prevented garcinol-induced G1 arrest. Besides, garcinol also inhibited ERK and p38-MAPK activations in time-dependent mode. The pretreatment with p38-MAPK inhibitor but not ERK inhibitor raised garcinol-induced G1 population cells. Co-treatment with p38-MAPK inhibitor and garcinol synergistically elevated cyclin E, p21Waf1/Cip1, and p27Kip1 expressions. Meanwhile, overexpression dominant negative p38-MAPK also enhanced garcinol-induced p21Waf1/Cip1 expression in H1299 cells. Accordingly, our data suggested that garcinol induced G1 cell cycle arrest and apoptosis in lung cancer cells under different p53 statuses. The p53-independent G1 cell cycle arrest induced by garcinol might be through upregulation of p21 Waf1/Cip1 triggered from p38-MAPK signaling inactivation.

Original languageEnglish
Pages (from-to)2085-2095
Number of pages11
JournalJournal of Agricultural and Food Chemistry
Volume62
Issue number9
DOIs
Publication statusPublished - Mar 5 2014

Fingerprint

p38 Mitogen-Activated Protein Kinases
lung neoplasms
mitogen-activated protein kinase
Lung Neoplasms
cyclin-dependent kinase
Down-Regulation
cyclins
cells
Cells
Cyclin-Dependent Kinase 4
Cyclin-Dependent Kinase 2
G1 Phase Cell Cycle Checkpoints
apoptosis
benzophenone
fruit peels
Cyclin E
dosage
small interfering RNA
garcinol
inactivation

Keywords

  • G1 arrest
  • garcinol
  • lung cancer
  • p21
  • p38-MAPK
  • p53

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Chemistry(all)

Cite this

Induction of p21Waf1/Cip1 by garcinol via downregulation of p38-MAPK signaling in p53-independent H1299 lung cancer. / Yu, Sheng Yung; Liao, Chiung Ho; Chien, Ming Hsien; Tsai, Tsung Yu; Lin, Jen Kun; Weng, Meng Shih.

In: Journal of Agricultural and Food Chemistry, Vol. 62, No. 9, 05.03.2014, p. 2085-2095.

Research output: Contribution to journalArticle

Yu, Sheng Yung ; Liao, Chiung Ho ; Chien, Ming Hsien ; Tsai, Tsung Yu ; Lin, Jen Kun ; Weng, Meng Shih. / Induction of p21Waf1/Cip1 by garcinol via downregulation of p38-MAPK signaling in p53-independent H1299 lung cancer. In: Journal of Agricultural and Food Chemistry. 2014 ; Vol. 62, No. 9. pp. 2085-2095.
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abstract = "Garcinol, a polyisoprenylated benzophenone, from Garcinia indica fruit rind has possessed anti-inflammatory, antioxidant, antiproliferation, and anticancer activities. However, the anticancer mechanisms of garcinol in lung cancer were still unclear. Therefore, we examine the effects of garcinol on antiproliferation in human lung cancer cells. Treatments with garcinol for 24 h exhibited morphological changes and inhibited the proliferation of H460 (p53-wild type) and H1299 (p53-null) cells in dose-and time-dependent manners. Furthermore, a significant G1 cell cycle arrest was observed in a dose-dependent treatment after H1299 cells were exposed in garcinol, whereas garcinol induced apoptosis rather than cell cycle arrest in H460 cells. Moreover, cyclin-dependent kinase 2 (CDK2), cyclin-dependent kinase 4 (CDK4), cyclin D1, and cyclin D3 were decreased, although cyclin E and cyclin-dependent kinase 6 (CDK6) were increased in garcinol-treated H1299 cells. Meanwhile, the protein levels of CDK inhibitors p21Waf1/Cip1 and p27KIP1 also exhibited upregulation after garcinol treatments. The enhanced protein-associated level between p21Waf1/Cip1 and CDK4/2 rather than p27KIP1 and CDK4/2 was demonstrated in garcinol-treated cells. Additionally, knock-down p21Waf1/Cip1 by specific siRNA competently prevented garcinol-induced G1 arrest. Besides, garcinol also inhibited ERK and p38-MAPK activations in time-dependent mode. The pretreatment with p38-MAPK inhibitor but not ERK inhibitor raised garcinol-induced G1 population cells. Co-treatment with p38-MAPK inhibitor and garcinol synergistically elevated cyclin E, p21Waf1/Cip1, and p27Kip1 expressions. Meanwhile, overexpression dominant negative p38-MAPK also enhanced garcinol-induced p21Waf1/Cip1 expression in H1299 cells. Accordingly, our data suggested that garcinol induced G1 cell cycle arrest and apoptosis in lung cancer cells under different p53 statuses. The p53-independent G1 cell cycle arrest induced by garcinol might be through upregulation of p21 Waf1/Cip1 triggered from p38-MAPK signaling inactivation.",
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