A soft coral-derived compound, 11-dehydrosinulariolide, induces G2/M cell cycle arrest and apoptosis in small cell lung cancer

Yu Chao Lin, Jui Hsin Su, Shih Chao Lin, Chia Che Chang, Te Chun Hsia, Yu Tang Tung, Chi Chien Lin

Research output: Contribution to journalArticle

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Abstract

11-Dehydrosinulariolide, an active compound that is isolated from the cultured soft coral Sinularia flexibilis, has been suggested to show anti-tumor biological characteristics according to previous studies. However, its potential effect on small cell lung cancer (SCLC) remains unknown. The present study investigates the underlying mechanism for the treatment of SCLC in vitro and in vivo. Cell viability was examined using the methyl-thiazol-diphenyl-tetrazolium (MTT) assay. Flow cytometry was applied to evaluate cell cycle distribution and apoptosis. The expression of proteins related to the cell cycle and apoptosis was analyzed by Western blot analysis. Additionally, an in vivo study was performed to determine the anti-SCLC effect on an H1688 subcutaneous tumor in a BALB/c nude mouse model. 11-Dehydrosinulariolide inhibited cell growth, triggered G2/M arrest and induced H1688 cell apoptosis in a dose- and time-dependent manner. Additionally, 11-dehydrosinulariolide caused the accumulation of p53 and Bax, accompanied by the activation of DNA damage-inducing kinases, including ataxia-telangiectasia mutated (ATM) and checkpoint kinase 2 (CHK2). Moreover, 11-dehydrosinulariolide increased the activity of caspase-3 and -7, suggesting that caspases are involved in 11-dehydrosinulariolide-induced apoptosis. 11-Dehydrosinulariolide also increased the level of tumor suppressor phosphatase and tensin homolog (PTEN) and inhibited the expression of phosphorylated Akt. In the in vivo study, the intraperitoneal injection of 11-dehydrosinulariolide at a dosage of 10 mg/kg significantly inhibited tumor growth compared with the control treatment. Together, the data indicate that 11-dehydrosinulariolide induces G (2)/M cell cycle arrest and apoptosis through various cellular processes, including the upregulation of p53 and Bax, activation of ATM and Chk2, activation of caspase-3 and -7, and accumulation of PTEN, leading to inhibition of the Akt pathway. These findings suggest that 11-dehydrosinulariolide might serve as a promising chemotherapy drug in the treatment of SCLC.

Original languageEnglish
Article number479
JournalMarine Drugs
Volume16
Issue number12
DOIs
Publication statusPublished - Nov 30 2018

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G2 Phase Cell Cycle Checkpoints
Anthozoa
Small Cell Lung Carcinoma
Apoptosis
Caspase 7
Ataxia Telangiectasia
Phosphoric Monoester Hydrolases
Caspase 3
Neoplasms
Checkpoint Kinase 2
Cell Cycle
11-dehydrosinulariolide
Growth
Caspases
Cell Cycle Checkpoints
Intraperitoneal Injections
Nude Mice
DNA Damage
Cell Survival
Flow Cytometry

Keywords

  • 11-dehydrosinulariolide
  • Apoptosis
  • Cell cycle arrest
  • Small cell lung cancer
  • Soft coral

ASJC Scopus subject areas

  • Drug Discovery

Cite this

A soft coral-derived compound, 11-dehydrosinulariolide, induces G2/M cell cycle arrest and apoptosis in small cell lung cancer. / Lin, Yu Chao; Su, Jui Hsin; Lin, Shih Chao; Chang, Chia Che; Hsia, Te Chun; Tung, Yu Tang; Lin, Chi Chien.

In: Marine Drugs, Vol. 16, No. 12, 479, 30.11.2018.

Research output: Contribution to journalArticle

Lin, Yu Chao ; Su, Jui Hsin ; Lin, Shih Chao ; Chang, Chia Che ; Hsia, Te Chun ; Tung, Yu Tang ; Lin, Chi Chien. / A soft coral-derived compound, 11-dehydrosinulariolide, induces G2/M cell cycle arrest and apoptosis in small cell lung cancer. In: Marine Drugs. 2018 ; Vol. 16, No. 12.
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AU - Hsia, Te Chun

AU - Tung, Yu Tang

AU - Lin, Chi Chien

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N2 - 11-Dehydrosinulariolide, an active compound that is isolated from the cultured soft coral Sinularia flexibilis, has been suggested to show anti-tumor biological characteristics according to previous studies. However, its potential effect on small cell lung cancer (SCLC) remains unknown. The present study investigates the underlying mechanism for the treatment of SCLC in vitro and in vivo. Cell viability was examined using the methyl-thiazol-diphenyl-tetrazolium (MTT) assay. Flow cytometry was applied to evaluate cell cycle distribution and apoptosis. The expression of proteins related to the cell cycle and apoptosis was analyzed by Western blot analysis. Additionally, an in vivo study was performed to determine the anti-SCLC effect on an H1688 subcutaneous tumor in a BALB/c nude mouse model. 11-Dehydrosinulariolide inhibited cell growth, triggered G2/M arrest and induced H1688 cell apoptosis in a dose- and time-dependent manner. Additionally, 11-dehydrosinulariolide caused the accumulation of p53 and Bax, accompanied by the activation of DNA damage-inducing kinases, including ataxia-telangiectasia mutated (ATM) and checkpoint kinase 2 (CHK2). Moreover, 11-dehydrosinulariolide increased the activity of caspase-3 and -7, suggesting that caspases are involved in 11-dehydrosinulariolide-induced apoptosis. 11-Dehydrosinulariolide also increased the level of tumor suppressor phosphatase and tensin homolog (PTEN) and inhibited the expression of phosphorylated Akt. In the in vivo study, the intraperitoneal injection of 11-dehydrosinulariolide at a dosage of 10 mg/kg significantly inhibited tumor growth compared with the control treatment. Together, the data indicate that 11-dehydrosinulariolide induces G (2)/M cell cycle arrest and apoptosis through various cellular processes, including the upregulation of p53 and Bax, activation of ATM and Chk2, activation of caspase-3 and -7, and accumulation of PTEN, leading to inhibition of the Akt pathway. These findings suggest that 11-dehydrosinulariolide might serve as a promising chemotherapy drug in the treatment of SCLC.

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