SF1, a Standardised Fraction from Clinacanthus nutans Modulates Notch1 Signalling in Cervical Cancer Stem-Like Cells

Area of Science:

• Oncology
• Molecular Biology
• Pharmacology

Background:

• Aberrant Notch1 signaling drives cervical cancer progression and chemoresistance.
• Targeting Notch1 is essential for eradicating cervical cancer stem cells (CCSCs).
• SF1, a fraction from Clinacanthus nutans, shows cytotoxicity against cervical cancer cells, but its mechanism is unclear.

Purpose of the Study:

• To investigate if SF1 inhibits Notch1 signaling in CCSCs.
• To elucidate the mechanism of SF1's anti-cancer effects.

Main Methods:

• SF1 isolated from Clinacanthus nutans via bioassay-guided fractionation.
• Cervical cancer stem cells (CCSCs) enriched from SiHa cell line as cervospheres.
• Notch1 activity assessed by Western blot and RT-PCR after SF1 treatment.

Main Results:

• SiHa cervospheres exhibited enhanced sphere formation and higher expression of stemness markers (Sox2, Nanog).
• CCSCs showed elevated Notch1 activity (NICD protein and mRNA) compared to monolayers.
• SF1 treatment significantly reduced NICD protein levels while increasing Notch1 mRNA, suggesting post-transcriptional/translational modulation.

Conclusions:

• SF1 exhibits antitumor effects against SiHa-derived CCSCs.
• SF1 modulates Notch1 signaling, a key pathway in cancer stem cell stemness.
• Further research is needed to fully elucidate SF1's precise mechanism of action.