Baccatin III

Baccatin III (CAS No.: 27548-93-2) is a naturally derived diterpenoid isolated from Taxus species and serves as a key biosynthetic precursor to paclitaxel, positioning it as an important molecule in natural product-based drug discovery and cancer research. Functionally, it acts as a selective modulator of the TGF-β1 signaling axis and suppressor of myeloid-derived suppressor cell (MDSC) activation, exerting its effects through regulation of AKT/STAT6 and Smad2/3 pathways, thereby attenuating TGF-β1-induced fibroblast differentiation and immunosuppressive signaling within the tumor microenvironment. Baccatin III has demonstrated the ability to inhibit macrophage activation and extracellular matrix deposition, supporting its anti-inflammatory and anti-fibrotic properties, while also promoting apoptosis across multiple cancer cell lines at low micromolar concentrations. In addition, it enhances antigen-presenting capacity in dendritic cells without impairing phagocytic function, indicating a role in modulating immune responses. In vivo studies further suggest that it can reduce tumor growth and limit MDSC accumulation and activity, highlighting its relevance in immuno-oncology and fibrosis research. As a bioactive small molecule with multi-pathway regulatory functions, Baccatin III is widely utilized in mechanistic studies, cell-based assays, and preclinical models, with experimental concentrations or dosing regimens varying according to specific study designs and therapeutic investigation goals.