Revisiting multi-pathway modulation with theophylline derivatives: Targeting STAT3, NF-κB, and apoptotic signaling in...

Area of Science:

• Oncology
• Medicinal Chemistry
• Molecular Biology

Background:

• Breast cancer is a leading cause of cancer-related deaths in women, often characterized by metastasis.
• Targeting key signaling pathways like STAT3 (Signal Transducer and Activator of Transcription 3) and NF-κB (Nuclear Factor kappa-light-chain-enhancer of activated B cells) is a promising strategy for cancer therapy.

Purpose of the Study:

• To design and synthesize novel theophylline-based derivatives as dual inhibitors of STAT3 and NF-κB signaling pathways.
• To evaluate the anticancer potential of these compounds against various breast cancer cell lines and assess their mechanism of action.

Main Methods:

• Synthesis of theophylline-based compounds.
• In vitro assays to determine IC50 values for STAT3/NF-κB inhibition and anticancer activity in breast cancer cell lines (4T1, MDA-MB-231, MDA-MB-468, MCF-7).
• Scratch and transwell assays to evaluate cell migration and invasion.
• Western blotting to analyze protein expression (STAT3, p-STAT3, Bcl-xl, c-Myc, NF-κB).
• In vivo study using an Ehrlich solid carcinoma model to assess tumor volume reduction.

Main Results:

• Compounds 12a, 12b, and 17b demonstrated potent inhibition of STAT3 and NF-κB activation (IC50: 4.22–8.21 μM) and significant anticancer activity (IC50: 1.53–7.68 μM) across multiple breast cancer cell lines.
• These compounds effectively inhibited breast cancer cell migration and invasion.
• Compound 12a induced apoptosis by modulating caspases-3, 9, Bax, and Bcl-2, and decreased expression of STAT3, p-STAT3, Bcl-xl, c-Myc, and NF-κB in MDA-MB-231 cells.
• Compound 12a reduced tumor volume in vivo, comparable to 5-fluorouracil (5FU).
• Molecular docking studies confirmed favorable binding interactions with STAT3 and NF-κB active sites.

Conclusions:

• The novel theophylline-based derivatives exhibit significant dual inhibition of STAT3 and NF-κB signaling pathways.
• These compounds possess promising anticancer properties, including inhibition of proliferation, migration, invasion, and induction of apoptosis in breast cancer models.
• The identified compounds serve as valuable leads for further optimization into potent therapeutic agents for breast cancer treatment.