Anticancer Potential of Thieno[2,3-d]pyrimidine Derivatives in Oral Carcinoma Models

Area of Science:

• Medicinal Chemistry
• Oncology
• Pharmacology

Background:

• Oral squamous cell carcinoma (OSCC) presents significant therapeutic challenges due to aggressive nature, frequent recurrence, and lack of treatment selectivity.
• Current treatment modalities for OSCC often lack specificity, leading to off-target effects and limited efficacy.

Purpose of the Study:

• To synthesize and evaluate a series of novel 4-amino-2-substituted tetrahydrobenzothieno[2,3-d]pyrimidine derivatives for their anticancer potential against OSCC.
• To investigate the cytotoxic, antiproliferative, and mechanistic effects of these compounds on OSCC cell lines with varying metastatic potential and normal keratinocytes.

Main Methods:

• Synthesis of seven tetrahydrobenzothieno[2,3-d]pyrimidine derivatives.
• Assessment of cytotoxic and antiproliferative effects using cell viability and clonogenic assays on OSCC (HSC-3, SCC-9) and HaCaT cell lines.
• Mechanistic studies including cell cycle analysis and apoptosis assays.
• In silico analysis of ADME and drug-likeness properties.

Main Results:

• Compounds 5 and 6 exhibited significant selective cytotoxicity and antiproliferative activity against OSCC cell lines, particularly the highly metastatic HSC-3 cells.
• Anticancer effects were linked to S-phase cell cycle arrest, induction of apoptosis, and disruption of the actin cytoskeleton.
• In silico studies indicated favorable drug-like properties for the most potent derivatives.

Conclusions:

• Tetrahydrobenzothieno[2,3-d]pyrimidine derivatives represent a promising scaffold for developing targeted therapies for oral squamous cell carcinoma.
• Compounds 5 and 6 demonstrate potential as lead compounds for further optimization and in vivo studies in OSCC treatment.