MIL-88A@catechin as a dual-action therapeutic for reactive oxygen species-mediated apoptosis and angiogenesis modulation in breast cancer in vitro and in vivo
Breast cancer continues to pose a significant clinical challenge due to its fast progression and resistance to therapy, requiring novel treatment approaches. We present the design and assessment of a defective iron-based metal–organic framework (MIL-88A) functionalized with catechin (MIL-88A@catechin) as a dual-action platform for redox regulation and targeted cancer treatment. The defect-engineered MIL-88A framework, containing approximately 0.6148 missing linkers per Fe3 node, was confirmed by CHN elemental analysis and inductively coupled plasma mass spectrometry. These structural defects create stable coordination sites that facilitate catechin immobilization through iron–phenolate interactions. The redox activity of MIL-88A@catechin was shown by increased reactive oxygen species production by catechin-facilitated Fe3+/Fe2+ cycling, while structural characterization was confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, field-emission scanning electron microscopy, and X-ray photoelectron spectroscopy. In vitro investigations revealed preferential cytotoxicity against MDA-MB-231 breast cancer cells (IC50 = 25.16 μg/mL), while preserving over 80% viability in normal MCF-10A cells. Flow cytometry indicated 17.7% early apoptosis, 21.3% late apoptosis, and 4.38% necrosis, affirming apoptosis as the predominant mechanism. Quantitative reverse transcription polymerase chain reaction analysis demonstrated a considerable overexpression of BAX (p<0.01), CASP9 (p<0.001), and CASP8 (p<0.0001), in conjunction with elevated BCL2 expression (p<0.0001), indicating the activation of both intrinsic and extrinsic apoptotic pathways. In vivo assessment in a mouse breast cancer model revealed decreased tumor necrosis (50–60% compared to 60–70% in controls), lower mitotic counts (31 vs. 37), and increased apoptotic cell numbers (10 vs. 7). Gene expression analysis demonstrated the downregulation of CASP8 (p<0.05) and VEGFR2 (p<0.01), with the overexpression of CASP9 (p<0.001) and VEGFR1 (p<0.001), underscoring intrinsic apoptotic activation and angiogenesis modulation.
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