Origanum majorana ethanolic extract promotes colorectal cancer cell death by triggering abortive autophagy and activation of the extrinsic apoptotic pathway

Nehla Benhalilou, Halima Alsamri, Aysha Alneyadi, Khawlah Athamneh, Asma Alrashedi, Nedaa Altamimi, Yusra Al Dhaheri, Ali H. Eid, Rabah Iratni

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Colorectal cancer is considered as the third leading cause of cancer death. In the present study, we investigated the potential anticancer effect and the molecular mechanism of Origanum majorana ethanolic extract (OME) against human colorectal cancer cells. We showed that OME exhibited strong anti-proliferative activity in a concentration-and time-dependent manner against two human colorectal cancer cell lines (HT-29 and Caco-2). OME inhibited cell viability, colony growth and induced mitotic arrest of HT-29 cells. Also, OME induced DNA damage, triggered abortive autophagy and activated a caspase 3 and 7-dependent extrinsic apoptotic pathway, most likely through activation of the TNFα pathway. Time-course analysis revealed that DNA damage occurred concomitantly with abortive autophagy after 4 h post-OME treatment while apoptosis was activated only 24 h later. Blockade of autophagy initiation, by 3-methyladenine, partially rescued OME-induced cell death. Cell viability arose from 37% in control group to 67% in group pre-treated with 3-MA before addition of OME. Inhibition of apoptosis, however, had a minimal effect on cell viability; it rose from 37% in control group to 43% in group pre-treated with Z-VAD-FMK. We also found that OME downregulated survivin in HT-29 cells. Our findings provide a strong evidence that O. majorana extract possesses strong anti-colon cancer potential, at least, through induction of autophagy and apoptosis. These finding provide the basis for therapeutic potential of O. majorana in the treatment of colon cancer.

Original languageEnglish
Article number795
JournalFrontiers in Oncology
Volume9
Issue numberAUG
DOIs
Publication statusPublished - 2019

Keywords

  • Abortive autophagy
  • Apoptosis
  • Colon cancer
  • DNA damage
  • HPLC-MS
  • Origanum majorana

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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