Study on the modification and anti-tumor activity of silybin derivatives for CDK4/6 targeted / 药学学报

By using computer-aided drug design, the activities group model which CDK4/6 inhibitors on the market were introduced to silybin C-7, and a series of silybin derivatives were designed and synthesized, and the structure was confirmed by MS, 13C NMR and 1H NMR. The in vitro antitumor activity evaluation of the target compound was carried out by MTT method, and the in vitro anti-tumor activity was carried out in human hepatocellular carcinoma cells (HepG-2). Experimental results show that all compounds are higher than the activity of the parent silybin, of which compound I1 has a certain inhibitory effect on human HepG-2 cells, which is worth further study.

Targeting PDGF receptor inhibitors: synthesis and biological evaluation of oleanolic acid analogs / 药学学报

The computer-aided design was used to simulate the docking of PDGF receptor with known active compounds, and the active groups that can bind to key sites were identified by analyzing the key amino acid residue fragments that exerted active effects on the target proteins. The natural product oleanolic acid was used as the parent, and the active group was introduced into the 2-position, and the C-28 carboxyl group was esterified and amidated. A series of oleanolic acid analogues targeting PDGF receptor inhibitors were designed and synthesized. Their structures were confirmed by MS and NMR. Through MTT assay, SGC-7901 and A549 cells were selected for preliminary in vitro anti-tumor activity screening. PDGF receptor protein inhibition test was performed on I3 and Ⅱ5 by FPIA. The activity tests showed that I3 and Ⅱ5, compared with the positive control drug, had stronger inhibition. FPIA test showed that Ⅱ5 and PDGF receptor protein had good binding ability. The newly synthesized oleanolic acid analogues have significantly higher antitumor activity than the parent compound and deserve further study.

Synthesis and anti-tumor activity of derivatives of ursolic acid in vitro / 药学学报

A series of ursolic acid derivatives were synthesized by the introduction of 4-chloroindole compounds at A ring and esterification and amidation at C-28 position, which structures were characterized by 1H NMR, MS and etc. The cytotoxic activity of derivatives was evaluated against HepG2 and SGC7901 cells in vitro by MTT assay, in which paclitaxel and adriamycin were used as a positive control. The results indicated that all of derivatives can inhibit cell proliferation in HepG2 and SGC7901 cells with a better activity than ursolic acid. Especially, the compounds 6 and 12 showed significant antitumor activity comparable to the paclitaxel. The compounds are worthy to be studied further.

Preparation and evaluation of new cyanoacrylate nanosphere with alcoxyle side group for gene delivery / 国际药学研究杂志

Objective To prepare a new(alcoxyle cyanoacrylate)-based nanosphere for brain targeting gene delivery and evaluate its physicochemical properties,capability of delivery of transforming growth factor beta 2(TGF-β2)antisense oligonucle?otides(ASON),and its potential use on tumor cell suppression in vitro.Methods The cationic nanospheres(NS)were prepared by emulsion polymerization method with DEAE-dextran as cationic stabilizer.The ASON were adsorbed by charge interaction,and poly?sorbate-80 was used as brain-targeting modification.The morphology was observed by transmission electron microscopy(TEM).The average particle size and Zeta potential were determined by dynamic light scattering(DLS). The ultraviolet spectrophotometry was used to determine the entrapment efficiency and drug loading.Agarose gel electrophoresis was used to analyze the optimal loading ratio of ASON-NS,and also the protection of ASON in DNaseⅠand serum containing environment.The release rate of ASON was deter?mined by dialysis.The cytotoxicity on L929 cells and the anti-tumor activity on A172 cells were evaluated by MTS.Results The TEM showed a typical round nanospheres morphology,and no adhesion was detected.The particle size was(79.04±4.33)nm,the disper?sion coefficient was 0.04 ± 0.03,the Zeta potential was(33.60 ± 0.60)mV. The encapsulation efficiency of ASON-NS was(83.14 ± 1.90)%,and the drug loading of ASON-NS was(11.59±0.56)%.The NS provided ASON protection against the Dnase I and serum containing environment. The NS-ASON could effectively deliver ASON into A172 cells and show anti-tumor activity. Besides,little L929 cytotoxicity was detected.Conclusion A new cyanoacrylate nanosphere with alcoxyle side group for brain targeting gene deliv?ery was prepared successfully. It had good ASON loading and delivery capability,providing new carrier materials for nucleic acid drugs.

Advances in study of Survivin inhibitors / 药学学报

Survivin, a member of the inhibitor of apoptosis proteins family, is considered to be an important target of anticancer treatment for its key role in the control of cell division and cell apoptosis. Currently, only a few Survivin inhibitors have been developed, and most of them reduce Survivin level by interacting with other biomolecules instead of directly interacting with Survivin protein. This review summarizes the structure of Survivin protein, the mechanism of action and research progress of Survivin inhibitors, which may has a great significance in the study of selective Survivin inhibitors in the future.

Synthesis and anti-tumor activity of oleanolic acid derivatives / 药学学报

Thirteen novel oleanolic acid (OA) derivatives were designed and synthesized with modification at positions of C-3, C-12 and C-28 of OA. Their structures were confirmed by MS, 1H NMR and elemental analysis. Their in vitro cytotoxicities against various cancer cell lines (SGC7901, MCF-7 and A549) were evaluated by MTT assay. The results indicated that the tested derivatives were found to have stronger cell growth inhibitory activity than OA. Among them, compounds II2 and II3 showed more potent cytotoxicity on MCF-7 and A549 tumor cells than gefitinib (positive control). They are worthy to be studied further.

Synthesis and anti-tumor activity of ursolic acid derivatives / 药学学报

Structure of natural product-ursolic acid was modified for increasing its antitumor activity. Ursolic acid was acylated, esterified, hydrolized or oxidized to obtain target pentacyclic triterpenoid compounds with different substitutes. Sixteen derivatives of ursolic acid were designed and synthesized including eleven new compounds. Anti-tumor activities of ursolic acid and these derivatives against HeLa, SKOV3 and BGC-823 cells in vitro were investigated by MTT assay. The results indicated that compounds 7a and 8a were found to have stronger cell growth inhibitory than ursolic acid on HeLa cells and SKOV3 cells separately, and are worth to be intensively studied further.

Synthesis and anti-tumor activity of oleanolic acid derivatives / 药学学报

Structural modifications were performed with natural product of oleanolic acid to search for novel anticancer drugs. Ten oleanolic acid derivatives were designed and obtained by the reaction of oxidation, acylation or hydrolyzation, etc. The cytotoxic activity of derivatives was evaluated against HeLa, HepG2 and BGC-823 cells in vitro by MTT assay, gefitinib and etoposide used as a positive control. The results showed that compound 5a was particularly active to inhibit HepG2 cells growth, and anti-tumor activity of compound 7 on HeLa cells was significantly stronger than oleanolic acid. They are worthy to be studied further.