A novel HSP90 modulator with selective activity against thyroid cancers in vitro

Area of Science:

• Oncology
• Pharmacology
• Molecular Biology

Background:

• Heat shock protein 90 (HSP90) is a key regulator of proteins implicated in thyroid cancer progression.
• Targeting HSP90 offers a potential therapeutic strategy for thyroid malignancies.

Purpose of the Study:

• To evaluate a novel natural product, BTIMNP_D004, for its anticancer effects on thyroid cancer cell lines in vitro.
• To elucidate the mechanism of action of BTIMNP_D004, focusing on HSP90 modulation.

Main Methods:

• Screening of 285 natural plant extracts and compounds using MTS assay for antiproliferative activity.
• Assessment of apoptosis and cell cycle arrest via flow cytometry (Annexin V-PI staining).
• Western blot analysis to determine modulation of HSP90 and its client proteins.

Main Results:

• BTIMNP_D004 exhibited significant antiproliferative activity against thyroid cancer cells (IC50 = 155-2,890 nM), showing cancer-cell selectivity.
• D004 induced cell cycle arrest (G1/G0 to S and G2/M phases) and significant apoptosis in thyroid cancer cells.
• Western blot confirmed modulation of HSP90, inhibition of HSF-1, AKT, and caspase-3, and PARP cleavage.

Conclusions:

• BTIMNP_D004 demonstrates potent in vitro anticancer activity against thyroid cancer.
• The compound acts by inducing apoptosis, cell cycle arrest, and modulating HSP90-related pathways.
• These findings support further preclinical investigation of BTIMNP_D004 for thyroid cancer therapy.