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Despite the tremendous success of cisplatin and other platinum-based anticancer drugs, severe toxicity and resistance to tumors limit their applications. It is believed that the coordination (formation of covalent bond) of the metal (platinum) to the nitrogen bases of DNA cause the ruptures of the cancer as well as normal cells. A search for anticancer drugs with different modes of action resulted in the synthesis of variety of novel compounds. Many of them are in clinical trials now. Recently we synthesized a series of novel rhenium pentylcarbonato compounds (PC1-PC6). The rhenium atom in each compound is coordinated (bonded) to a planar polypyridyl aromatic ligand, thereby forcing each compound to intercalate between the DNA bases. We have investigated the DNA binding properties of one of the PC-series of compounds (PC6) using electronic spectroscopy. The UV absorption titration of PC6 with DNA shows hypochromic effect with concomitant bathochromic shift of the charge transfer band at 290 nm. These results suggest that the compound PC6 binds to DNA through intercalation. It is therefore likely that the other PC-series of compounds will behave in a similar manner. Thus it is expected that these compounds will exhibit negligible or no side effect. We have observed that the PC-series of compounds are strong cytotoxic agents against lymphosarcoma (average GI50 ≈ 2±2.6 µM), PC-3 prostate (average GI50 ≈ 3±2.8 µM) and myeloid leukemia (average GI50 ≈ 3±2.8 µM) cancer cell lines. The average GI50 values of the PC-series of compounds are 2-3 less than the corresponding GI50 values of cisplatin. Also each of the PC-series of compounds exhibits less toxicity than cisplatin in the glomerular mesangial cells.

journal of bioprocessing and biotechniques

The Effect of Novel Rhenium Compounds on Lymphosarcoma, PC-3 Prostate and Myeloid Leukemia Cancer Cell Lines and an Investigation on the DNA Binding Properties of One of these Compounds through Electronic Spectroscopy