In silico and in vitro studies on the anti-cancer activity of andrographolide targeting survivin in human breast cancer stem cells

PLoS One. 2020 Nov 19;15(11):e0240020. doi: 10.1371/journal.pone.0240020. eCollection 2020.

Abstract

Breast cancer stem cells (BCSCs) express high levels of the anti-apoptotic protein, survivin. This study aimed to discover a natural active compound with anti-cancer properties that targeted survivin in human breast cancer stem cells. From the seven examined compounds, andrographolide was selected as a lead compound through in silico molecular docking with survivin, caspase-9, and caspase-3. We found that the affinity between andrographolide and survivin is higher than that with caspase-9 and caspase-3. Human CD24-/CD44+ BCSCs were treated with andrographolide in vitro for 24 hours. The cytotoxic effect of andrographolide on BCSCs was compared to that on human mesenchymal stem cells (MSCs). The expression of survivin, caspase-9, and caspase-3 mRNA was analyzed using qRT-PCR, while Thr34-phosphorylated survivin and total survivin levels were determined using ELISA and Immunoblotting assay. Annexin-V/PI flow cytometry assays were performed to evaluate the apoptotic activity of andrographolide. Our results demonstrate that the CC50 of andrographolide in BCSCs was 0.32mM, whereas there was no cytotoxic effect in MSCs. Moreover, andrographolide decreased survivin and Thr34-phosphorylated survivin, thus inhibiting survivin activation and increasing survivin mRNA in BCSCs. The apoptotic activity of andrographolide was revealed by the increase of caspase-3 mRNA and protein, as well as the increase in both the early and late phases of apoptosis. In conclusion, andrographolide can be considered an anti-cancer compound that targets BCSCs due to its molecular interactions with survivin, caspase-9, and caspase-3, which induce apoptosis. We suggest that the binding of andrographolide to survivin is a critical aspect of the effect of andrographolide.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antineoplastic Agents / pharmacology*
  • Apoptosis / drug effects
  • Breast Neoplasms / drug therapy*
  • Caspase 3 / metabolism
  • Caspase 9 / metabolism
  • Cell Line, Tumor
  • Diterpenes / pharmacology*
  • Humans
  • Mesenchymal Stem Cells / drug effects
  • Molecular Docking Simulation
  • Neoplastic Stem Cells / drug effects*
  • Survivin / metabolism*

Substances

  • Antineoplastic Agents
  • Diterpenes
  • Survivin
  • andrographolide
  • CASP3 protein, human
  • CASP9 protein, human
  • Caspase 3
  • Caspase 9

Grants and funding

“This work was funded by the PDUPT Grant (NKB-1564/UN2.R3.1/HKP.05.00/2019) from the Ministry of Research, Technology and Higher Education of the Republic of Indonesia. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.”