Melatonin reduces endothelin-1 expression and secretion in colon cancer cells through the inactivation of FoxO-1 and NF-κβ

Josefa León, Jorge Casado, Sergio M. Jiménez Ruiz, María Sol Zurita, Cristina González-Puga, Juan D. Rejón, Ana Gila, Paloma Muñoz De Rueda, Esther J. Pavón, Russel J. Reiter, Angela Ruiz-Extremera, Javier Salmerón

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

Melatonin is an indoleamine that is synthesised from tryptophan under the control of the enzymes arylalkylamine N-acetyltransferase (AA-NAT) and acetylserotonin methyltransferase (ASMT). Melatonin inhibits colon cancer growth in both in vivo and in vitro models; however, a precise mechanism responsible for inhibiting tumour growth has not been clearly described. Endothelin-1 (ET-1) is a peptide that acts as a survival factor in colon cancer, inducing cell proliferation, protecting carcinoma cells from apoptosis and promoting angiogenesis. The data presented show that melatonin inhibits edn-1 mRNA expression (the first step in ET-1 synthesis), ECE-1 protein expression and the release of ET-1 from colorectal cancer cells in vitro. ET-1 levels in cultured media present a similar inhibition pattern to that of edn-1 mRNA expression despite the inhibition of ECE-1 protein after melatonin treatment, which suggests that an endopeptidase other than ECE-1 could be mainly responsible for ET-1 synthesis. The inhibition of edn-1 expression is due to an inactivation of FoxO1 and NF-κβ transcription factors. FoxO1 inactivation is associated with an increased Src phosphorylation, due to elevated cAMP content and PKA activity, whereas NF-κβ inactivation is associated with the blockade of Akt and ERK phosphorylation due to the inhibition of PKC activity after melatonin treatment. Melatonin also inhibits edn-1 promoter activity regulated by FoxO1 and NF-κβ. Finally, a significant correlation was observed between AA-NAT and edn-1 expression downregulation in human colorectal cancer tissues. In conclusion, melatonin may be useful in treating colon carcinoma in which the activation of ET-1 plays a role in tumour growth and progression.

Original languageEnglish (US)
Pages (from-to)415-426
Number of pages12
JournalJournal of pineal research
Volume56
Issue number4
DOIs
StatePublished - May 2014

Keywords

  • FoxO-1
  • NF-κβ
  • colorectal cancer
  • endothelin-1
  • melatonin

ASJC Scopus subject areas

  • Endocrinology

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