Synthesis and antiproliferative activity of some steroidal lactams
摘要:
Using cholesterol as starting material, a series of 6-substituted-3-aza-A-homo-3-oxycholestanes and 6-substituted-4-aza-A-homo-3-oxycholestanes were synthesized by the oxidation, reduction, oximation, Beckman rearrangement and condensation reaction. These synthesized compounds displayed a distinct cytotoxicity against MGC 7901, HeLa and SMMC 7404 cancer cells. Our results revealed that the structures of functional groups at position-6 on the steroidal ring are crucial for the IC50 value of antiproliferative activities of these compounds and the cytotoxic activity against MGC 7901 and SMMC 7404 cells was not significantly different between 4-N-lactams and 3-N-lactams when its 6-substituted group was a carbonyl or a hydroximino, but all 3-N-lactams showed a higher cytotoxicity against HeLa cells than 4-N-lactams. In particular, compounds 6, 8, 9 (IC50 6: 6.5 mu mol/L; 8: 7.7 mu mol/L; 9: 5.6 mu mol/L) were even more cytotoxic than cisplatin to HeLa cells (positive contrast, 10.1 mu mol/L). The information obtained from the studies may be useful for the design of novel chemotherapeutic drugs. (C) 2011 Elsevier Inc. All rights reserved.
Syntheses and antiproliferative activity of some sulfated hydroximinosterols
摘要:
Four new sulfated steroidal compounds, sodium 3-hydroxy-6-hydroximinocholestane 3-sulfate (7a), sodium 3-hydroxy-6-hydroximinostigmastane 6-sulfate (7b), sodium 3-hydroxy-6-hydroximinocholest-4-ene 3-sulfate (10a), and sodium 6-hydroxy-3-hydroximinocholestane 6-sulfate (16) had been synthesized using cholesterol or stigmasterol as starting materials by different synthetic methods. The synthetic compounds were characterized by their analytical and spectral data, and their antiproliferative activity against MGC 7901 (human gastric carcinoma cell line), HeLa (human cervical carcinoma cell line), and SMMC 7404 (human liver carcinoma cell line) were investigated. The results showed that the compounds exhibited a remarkable cytotoxicity against HeLa tumor cells in vitro and 7a displayed a better cytotoxicity than cisplatin (a positive contrast).
side chain at position 17 is required for the biological activity of the compounds as we previously confirmed, elimination of the 4,5-double bond augmented the cytotoxicactivity for the steroidal oximes. In addition, the presence of a hydroxy on 3- or 6-position of the steroidal nucleus resulted in a remarkable increase of cytotoxicactivity. Our findings present more evidence showing the relationship
Steroidal thiosemicarbazones, semicarbazones and hydrazones have received extensive attention of scientists recently because they exhibit some biological activities such as antibacterial, antiviral and anticancer. Using different steroids as starting materials, through different chemical methods, 24 steroidal compounds with thiosemicarbazone, semicarbazone or hydrazone groups in their structures, were