| dc.description.abstract | Topic Ⅰ：Synthesis of core structure of one, two and many nitrogen atoms containing heterocycle with four indole derivatives as anti-cancer agents
Our previous developed tetraindole compounds, found that SK228 has a promising anti-cancer activity at the nanomolar range (J. Med. Chem. 2012, 55, 1583-1592). However, SK228 showed poor solubility and was toxic to the mice, our attempt is to improve these drawbacks in this study.
During optimization of reaction conditions, we synthesized a series of new tetraindole entities (compounds 2-17) containing a pyridine core at either 2, 5 position or 2, 6 position under I2/EtOH and CAN/ACN in reflux conditions, respectively. The results show that a potent candidate, 14 (FCW81) with a core structure of pyridine at 2,5 positions, has an optimum antiproliferative activity against human triple negative breast cancer (MDA-MB-231) cell, with similar anticancer potency compared to that of SK228. FCW81 induces DNA damage, G2/M arrest and apoptosis. Furthermore, FCW81 also significantly inhibited tumor growth in a xenograft human breast cancer mice model with apparent reduction of side effects. In summary, FCW81 has the potential to serve as an anticancer agent for the treatment of human breast cancers, especially in triple negative breast cancer.
A series of new tetraindole entities containing many nitrogen atoms heterocycle core was synthesized. Compound 24 had anticancer activity against triple negative breast cancer MDA-MB-231 and colon cancer SW480 cell lines with IC50 value 0.37 and 1.08 μM, respectively. The relative biological and animal studies are under progress.
Topic Ⅱ：Synthesis of lithocholic acid derivatives with different types of N3 linkers as sialyltransferase inhibitors and anti-metastatic agents
Recently, aberrant sialylation is found to be related to cancer metastasis. Our lab developed some sialyltransferase inhibitors, such as litho-O-Asp, AL10 and KS034, but they possessed moderate anti-migration inhibition in cellular level. This study focuses on developing the lithocholic acid derivatives to enhance the anti-migration activity with significant inhibition and selectivity of sialyltransferase.
The first generation of lithocholic acid derivatives was synthesized, 15 compounds (Ⅱ-2aA-2eA, Ⅱ-3aB-3eB and Ⅱ-4aC-4eC), containing the NBD, p-nitrobenzoyl or coumarin moieties with different length of azide linkers. We observed that lithocholic acid derivatives with NBD moiety have similar sialyltranferase inhibition in comparison to those of AL10 and KS034. Significantly, FCW34 and FCW66 had 2- or 3- folds anti-migration activity more than those of AL10 and KS034. Surprisingly, FCW34 meaningfully suppressed tumor growth and metastasis in a xenograft human breast cancer mice model. In summary, FCW34 had the potential to serve as an anti-metastasis agent for the treatment of human breast cancer with the unique inhibitory selectivity toward α(2,3)-N and α(2,6)-N sialyltransferases.
The second generation of lithocholic acid derivatives focuses on modification of lithocholic acid at C3 position, such as amino acid side chain and aromatic entities. The results showed that FCW393 and FCW551 had similar sialyltranferase inhibition in comparison to FCW34. Surprisingly, those FCW393 and FCW551 had 4- or 8- folds anti-migration activity more than that of FCW34. And FCW393 could effectively inhibited tumor growth and metastasis in a xenograft human breast cancer mice model. In summary, FCW393 display the potential to serve as an anti-metastasis agent for the treatment of human breast cancer with the unique inhibitory selectivity toward α(2,6)-N sialyltransferase. | en_US |