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Melatonin induces apoptosis through biomolecular changes, in SK-LU-1 human lung adenocarcinoma cells

P Plaimee1, N Weerapreeyakul, K Thumanu

  • 1Melatonin Research Group, Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand.

Cell Proliferation
|October 28, 2014
PubMed
Abstract

Insights

Melatonin, a natural compound, triggers cancer cell death (apoptosis) by altering lipid, protein, and DNA structures in lung cancer cells. This research clarifies melatonin's anti-cancer mechanisms.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Melatonin (N-acetyl-5-methoxytryptamine) is an indole-amine with reported anti-cancer effects.
  • The precise mechanisms of melatonin's action in lung cancer remain largely unknown.

Purpose of the Study:

  • To investigate melatonin's induction of apoptosis in the SK-LU-1 human lung cancer cell line.
  • To elucidate the biomolecular changes (lipid, protein, DNA) associated with melatonin's anti-cancer effects.

Main Methods:

  • Fourier transform infrared (FTIR) microspectroscopy was employed to analyze biomolecular changes.
  • Conventional methods included annexin V/PI staining for lipid changes, caspase-3/7 activity assays for protein alterations, and DAPI staining for DNA fragmentation.

Main Results:

  • FTIR data revealed increased lipid content and decreased nucleic acid/DNA intensity in response to melatonin.
  • Melatonin reduced α-helix secondary protein structure and shifted β-sheet structure frequency, correlating with increased caspase-3/7 activity.
  • Annexin V/PI and DAPI staining confirmed membrane alteration and DNA fragmentation, respectively.

Conclusions:

  • High concentrations of melatonin demonstrate anti-cancer properties by modifying the biomolecular structure of lipids, nucleic acids, and proteins.
  • These biomolecular alterations support melatonin's role in enhancing apoptosis induction in lung cancer cells.

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