Involvement of cGMP in cellular melatonin responses

Marina Bubis, Nava Zisapel

Research output: Contribution to journalArticlepeer-review


Melatonin can enhance and suppress constitutive protein secretion from murine melanoma M2R cells in vitro in a cholera-toxin (CTX) sensitive process. In a number of tissues melatonin has been shown to modulate cGMP levels. The involvement of cGMP in melatonin responses in the melanoma cells was investigated. The effects of melatonin on melanoma cells cGMP and cGMP-phosphodiesterase activity and the effects of cGMP analogs on the melatonin-mediated modulation of protein secretion were studied. Melatonin reduced cGMP levels in the melanoma cells. CTX treatment had a similar and non-additive effect. The effects of melatonin on protein secretion were abrogated by activation of cGMP-dependent protein kinases. In addition, melatonin inhibited cGMP phosphodiesterase activity in these cells. The data presented indicate that inhibition of cGMP via a CTX sensitive G protein may be a major signal transduction pathway used by melatonin in melanoma cells. (C) Elsevier, Paris.

Original languageEnglish
Pages (from-to)45-49
Number of pages5
JournalBiology of the Cell
Issue number1
StatePublished - 1999


  • CGMP
  • G protein
  • Melanoma
  • Melatonin
  • Phosphodiesterase
  • Protein secretion


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