Discovery of natural BH3 mimetics and research on related mechanism

In the past two decades,with the increase of smoking population,more and more people are suffering from small cell lung cancer(SCLC).Besides,it is difficult to find an effective way to cure SCLC,since patience can easily develop drug resistance.On the other hand,with the development of science and technology,people began to study the anti-cancer strategy to increase apoptosis,such as inhibiting the overexpression of survival factors.In these survival factors,BCL-2 family has attracted a lot of attention.BH3-only protein is a member of BCL-2 family and it can directly inhibit the expression of BCL-2 protein,thereby prompting apoptosis.Since the BH3-only protein itself is difficult to become a clinical drug,to find alternatives BH3-only protein-BH3 mimetics is particularly important.Plus,more and more researchers have paid attention on the natural BH3 mimetic since it has less side-effect than artificial BH3 mimetics.To find possible BH3 mimetics,we made a primary screening with this pharma.cophore on a small molecular compounds library via Discovery Studio software.And then MTS assay were introduced to verify the activity of compounds.After that,we use Western Blot and Co-IP meth.ods to test the effect of BH3 mimetics.And finally use CDOCKER to predict the further mechanism on autophagy and apoptosis.In our studies,we found 3 possible BH3 mimetics compounds from 170,000 natural small molecular compounds via pharmacophore-based virtual screening.Furthermore,we dem.onstrated AD23,one of the 3 possible natural BH3 mimetics,induced autophagy and apoptosis simulta.neously in dose-time dependence in SCLC cell line.Finally,we use Molecular Docking to predict the further mechanism on autophagy and apoptosis.We believe our works would provide evidences and clues for the structural optimizing and further study of new drugs in the future.