Viscumins functionally modulate cell motility-associated gene expression.

Area of Science:

• Phytochemistry
• Molecular Biology
• Oncology

Background:

• Viscum album L. (European mistletoe) extracts are used as complementary cancer therapy in Europe.
• Mistletoe lectins (ML) are key active components with anticancer effects, including immune stimulation and cytotoxicity.
• ML influence gene expression related to cancer development and progression.

Purpose of the Study:

• To investigate the effects of Viscum album extract (Iscador Qu) and specific mistletoe lectins (Aviscumine, ML-1) on gene expression in glioma cells.
• To determine if these compounds modulate genes involved in cell migration and invasion.
• To explore the role of the transforming growth factor (TGF)-β signaling pathway in ML-mediated effects.

Main Methods:

• Microarray expression analysis
• Quantitative reverse transcription PCR (RT-PCR)
• RT-PCR based validation of microarray data

Main Results:

• Iscador Qu, Aviscumine, and ML-1 differentially modulated genes regulating cell migration and invasion in glioma cells.
• Many differentially expressed genes were associated with the TGF-β signaling pathway or are TGF-β targets.
• ML treatment downregulated key components of the TGF-β pathway, including TGF-β, TGFBR2, SMAD2, MMP-2, and MMP-14.
• Despite variations between compounds, all reduced tumor cell motility in an ML-dependent manner.

Conclusions:

• Mistletoe lectins and extracts impact gene expression related to cell motility and invasion in glioma cells.
• The modulation of TGF-β signaling pathway components suggests a mechanism for ML's anti-invasive effects.
• ML-containing compounds show promise as adjuvant therapeutics for invasive tumors like glioblastomas.