Antitumor activity of vanadocene Y and its selenocyanate derivative in xenografted caki-1 tumors in mice
摘要:
The para-methoxybenzyl-substituted vanadocene dichloride (Vanadocene Y) (1) and its diselenocyanate (Selenocyanato-Vanadocene Y) (2) were tested in vitro in an anti-angiogenesis assay against human umbilical vein endothelial cells (HUVEC) delivering IC50 values of 0.92 +/- 0.03 mu M (1) and 37 +/- 11 mu M (2). In a cytotoxicity assay against the human renal cancer cells, CAKI-1, the compounds demonstrated IC50 values of 0.55 +/- 0.09 mu M (1) and 0.25 +/- 0.03 mu M (2). Then both compounds were given at their maximum tolerable dose, MTD, of 20 mg/kg/d (1) or 40 mg/kg/d (2) on four consecutive days or at 50% of the MTD on five consecutive days per week for three weeks to overall four cohorts of eight CAKI-1 tumor-bearing female NMRI:nu/nu mice each, while a further cohort was treated with solvent only. Both MTD-treated mouse cohorts showed a statistically significant tumor growth reduction with respect to the solvent-treated control group with an optimal T/C value of 47% on day 39 of the experiment. Immunohistological analysis revealed that the expression of the proliferation marker Ki-67 was reduced due to long-term treatment with 2. (C) 2010 Elsevier B.V. All rights reserved.
The cytotoxic effect of vanadocene dichloride (Cp2VCl2, 1) and its ring-substituted, (eta(5)-C5H4Me)(2)VCl2 (2), (eta(5)-C5Me5)(2)VCl2 (3), (eta 5-C5H4R)(2)VCl2 (4: R = MeOCH2CH2-, 5: R = 2-MeOC6H4CH2-, 6: R = 4-MeOC6H4CH2-) and ansa-bridged analogs Me2C(eta(5)-C5H4)(2)VCl2 (7) and Me4C2(eta(5)-C5H4)(2)VCl2 (8) was investigated. Synthesis of two new methoxy-functionalized compounds (4 and 5) is described. They were characterized by spectroscopic methods and X-ray diffraction analysis. The cytotoxicity studies were performed with leukemic cells MOLT-4. (C) 2011 Elsevier B. V. All rights reserved.