ABSTRACT
In this article, we have synthesized Co2+-doped BiOBrxCl1-x hierarchical nanostructured microspheres, featuring different degrees of Co2+ doping, displaying excellent photocatalytic performance. X-ray diffraction and Raman spectroscopy indicated that the Co2+ ions were successfully doped into the BiOBrxCl1-x nanocrystals. The photodegradation rate of rhodamine B mediated by a doped BiOBrxCl1-x was 150 % greater than that of the non-doped BiOBr. We ascribe the improved photocatalytic capability of the Co2+-doped BiOBrxCl1-x to a combination of its superior degree of light absorption, more efficient carrier separation, and faster interfacial charge migration. The major active species involved in the photodegradation of RhB also has been investigated. Moreover, the doped BiOBrxCl1-x possessed excellent cellular biocompatibility and displayed remarkable performance in the photocatalytic bacterial inactivation.
Subject(s)
Anti-Bacterial Agents , Bismuth , Escherichia coli , Microspheres , Anti-Bacterial Agents/pharmacology , Catalysis , RhodaminesABSTRACT
Colorectal cancer is a leading cause of death in the world. Despite the progress in therapeutic development, there are still challenges in clinical practice. Nanomedicine has emerged as a solution to enhance traditional therapy. Gold nanoparticles (AuNP) have been demonstrated as potential appliance in treating cancers, yet few studies investigated the capacity of biopolymer-conjugated AuNP in colon cancer as well as examined the system in both cancer cell line and animal models. In this study, we designed the AuNP/biopolymer composite therapeutic system with a chemotherapy agent, doxorubicin (DOX). Two composites with different drug load were applied (referred to as AuPPPyA and AuPPPyB). The composites were characterized by UV spectrum, transmission electron microscope (TEM), zeta potential measurement, and cell cycle analysis. Both therapeutic systems exhibited superior cytotoxic effects compared to DOX alone group. Compatible results were also demonstrated in vivo, as tumor inhibition rate were 46.2% in AuPPPyA and 66.4% in AuPPPyB, which were both higher than that of DOX alone (30%). Cell cycle regulation mediated by our composites was also examined in our study. In conclusion, our data demonstrated that AuNP/biopolymer composites are powerful in treating KRAS gene mutated colorectal cancer, and the system could potentially contribute to other clinical refractory diseases in the future.
Subject(s)
Antineoplastic Agents/pharmacology , Cell Cycle Checkpoints/drug effects , Colorectal Neoplasms/pathology , Doxorubicin/chemistry , Gold/chemistry , Metal Nanoparticles/chemistry , Proto-Oncogene Proteins p21(ras)/genetics , Animals , Antineoplastic Agents/chemical synthesis , Antineoplastic Agents/chemistry , Antineoplastic Agents/therapeutic use , Biopolymers/chemistry , Cell Line, Tumor , Cell Survival/drug effects , Colorectal Neoplasms/drug therapy , Colorectal Neoplasms/genetics , Doxorubicin/pharmacology , Drug Delivery Systems , Gold/pharmacology , Humans , Mice, Nude , Mutation , Xenograft Model Antitumor AssaysABSTRACT
Colon cancer is one of the most common cancers in the developed countries. The association between transforming growth factor TGFα and human cancer incidence has been suggested, yet, the regulatory roles of TGFα and the molecular mechanisms remain unknown, especially in colon cancer. We aim to investigate the functional regulations of TGFα in colon cancer progression. Two colon cancer cell lines were applied, and plasmid overexpression and siRNA-mediated depletion techniques were used to verify the role of TGFα in colon cancer. Cell proliferation was analyzed by MTS assay and colony formation assay, and western blot assay was used to examine protein expression. Migration, invasion, and reporter assays were also carried out to study the regulations of TGFα in colon cancer. Our results evidenced that expression of TGFα facilitates short-term and long-term proliferations of colon cancer cells. Moreover, TGFα was suggested as a migration-and-invasion promoting factor of colon cancer. Finally, our data indicated that TGFα modulates epithelial-mesenchymal transition (EMT) markers and NFκB signaling pathway in colon cancer cells. We provide the first time evidence of the promoting role TGFα plays in colon cancer tumorigenesis with proposed regulatory mechanisms involving EMT alteration and NFκB signaling pathway.
