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Preparation and Characterization of Dictyophora indusiata Polysaccharide-Zinc Complex and Its Augmented Antiproliferative Activity on Human Cancer Cells.

Dictyophora indusiata polysaccharide (DP1) was successfully chelated with zinc chloride to achieve its enhanced antiproliferative activity. The obtained DP1-Zn complex showed significant antiproliferative activity (18.1 ± 2.84% viability of MCF-7 cells at 250 μg/mL) on a group of human cancer cell lines through induction of apoptosis. The pro-apoptotic action of DP1-Zn was confirmed by morphological changes including chromatin condensation, DNA breakage, and S phase cell cycle arrest in human breast adenocarcinoma cells (MCF-7). The DP1-Zn-induced apoptotic pathways were characterized by the activation of caspases-3, -8, and -9, mitochondrial dysfunction, and reactive oxygen species (ROS) overproduction (305 ± 7.06% production of control at 250 μg/mL). This study suggested that DP1-Zn can be developed as a candidate for cancer treatment and prevention, especially human breast adenocarcinoma.