NAMPT活性化合物的研究
[Abstract]:Nicotinamide phosphoribosyltransferase (NAMPT) is composed of 491 amino acids with a molecular weight of 55 K Da. The crystal structure of NAMPT is a dimer type II phosphoribosyltransferase. NAMPT has a wide range of biological functions, in addition to regulating lipid metabolism and promoting vascular smooth muscle cell differentiation. In recent years, a large number of studies have shown that NAMPT is a promising anti-tumor target. In many tumor cells, NAMPT is overexpressed and associated with tumors. At the same time, NAMPT is also very important in the protection of stroke, and its direct product NMN has a very good protective effect on stroke. Therefore, the development of small molecule inhibitors and activators targeting NAMPT plays a vital role in the treatment of cancer and stroke, and currently targeted at The development of small molecule compounds of NAMPT is still in its infancy. For the development of clinical drugs, a large number of small molecule compounds of NAMPT with various structures are still needed as the basis. Meanwhile, we focused on the discovery, optimization and mechanism of novel NAMPT inhibitors and activators. First, based on the non-Chemdiv compound library, we screened inhibitors, optimized compounds and their mechanisms. Using high throughput screening and detection technology based on NAMPT specific targets, we obtained a NAMPT inhibitor M with good activity. SO (China Patent No. It is the downstream target NMNAT. We provide a chemical example for the first time. Using the recently reported technique of cell heat transfer analysis, we analyzed the reasons for the difference in activity between intracellular and extracellular compounds. The best activity was shown (IC50 = 0.93 + 0.29 n M), but its activity was poor at the cellular level. Through the study of point mutation of NAMPT enzyme and crystal culture, we confirmed the binding pattern of inhibitors and their important functional amino acid residues. This study is to understand the molecular action pattern and future of NAMPT inhibitors in a deeper level. Second, a large number of novel NAMPT inhibitors are needed in the development of anti-tumor drugs based on the Chemdiv compound library. Chemdiv chelation of 30,000 compounds is used in the high throughput screening platform based on NAMPT target. Two compounds with better activity, F671-0003 (IC50 = 85.05 (+6.42 n M)) and M049-0244 (IC50 = 170 (+12 n M)), were found to inhibit the proliferation of Hep G2 cell lines and significantly reduce the intracellular NAD level. The results of structure-activity analysis showed that the molecular interaction mode of compound F671-0003 and the hydrogen bonding force, hydrophobic force and pi-pi force were very important for the binding of the compounds. On the other hand, imaging studies showed that the fluorescent compound M049-0244 was at 3 mu M. NAMPT in HepG2 can be stained significantly at the concentration of NAMPT, and fluorescence can still be detected after 4 hours. The fluorescence specificity of the compound was confirmed by RNA interference technique and NAMPT overexpression in mice. NAMPT detection using fluorescent probes. 3. Screening of potential NAMPT activators based on compound libraries and their mechanisms; screening of hemdiv compounds and non-Chemdiv compounds libraries using a high throughput screening platform based on NAMPT as a target. A total of 495 compounds with potential NAMPT activation were found. In summary, this study aimed at the compound library composed of 54434 small molecule compounds, and applied the self-established high-throughput detection technology based on NAMPT as the target to small molecule NAMPT. A series of novel NAMPT inhibitors were selected, especially compounds MSO with novel structure and M049-0244 with NAMPT fluorescence probe. Forty-six structural analogues were synthesized and optimized with MSO as the basic structure. Their structure-activity relationship and composition were discussed in detail. In this paper, the discovery of NAMPT small molecule active compounds and the further study of the mechanism of action have laid the foundation for the future development of anti-tumor drugs and stroke protective drugs.
【學(xué)位授予單位】:第二軍醫(yī)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:R91
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