合欢皮作为常用中药,临床常用于治疗失眠、焦虑、肿瘤等。现代药理中针对合欢皮总皂苷(TSAJ)抗肿瘤活性多有报道,但由于单体成分分离困难,药理机制难以开展。该研究采用MTT法和Hoechst 33258染色法,确认了TSAJ对肝癌细胞的生长抑制作用,构建了表面修饰有TSAJ的固相亲合微球,利用该固相微球特异性地从人肝癌细胞裂解液中富集靶点蛋白,再利用高分辨质谱对富集到的靶点蛋白进行鉴定。采用Matabo Analyst 3.0处理数据,筛选并确定了Exportin-2,Beta-actin-like protein 2,Myosin-9,Protein transport protein Sec61 subunit beta,Cytochrome c oxidase copper chaperone等5个靶点蛋白。这些蛋白分别具有调控细胞凋亡及细胞生长、分化、运动等功能,提示TSAJ的抗肿瘤机制可能与诱导细胞凋亡及抑制肿瘤血管生成有关。综上所述,该研究利用TSAJ修饰的固相亲和微球,特异性富集并鉴定了TSAJ的靶点蛋白,从靶点源头上解释了TSAJ抗肿瘤作用机制,同时也为中药复杂体系的分子药理机制研究提供了一种全新的思路。
Oral nanoparticles play an important role in improving the bioavailability of poorly water-soluble drug. It is necessary to investigate the interaction of nanoparticles with intestinal epithelial cells. In general, na...
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Oral nanoparticles play an important role in improving the bioavailability of poorly water-soluble drug. It is necessary to investigate the interaction of nanoparticles with intestinal epithelial cells. In general, nano-carriers labeled with fluorescent probes are always chosen. However, fluorescent dye via physical loading may leak in complex biological environment and lose its function to trace the transport behavior ofnanoparticles. Fluorescent probes chemically coupled on the nanoparticles may alter the properties of nanoparticles. Therefore, a facile and exact detection method is required to trace intracellular and transcellular pathways of oral nano-medicines. In our study, gold nanoparticles were selected as nano-carriers owing to their unique characteristics of light scattering. The feasibility of gold nanoparticle detection through reflected light signal was tested in different situations, including gold nanoparticle solution, cell and animal level As a result, high resolution image of gold nanoparticles could be detected through reflection mode by confocal laser scanning microscope (CLSM) when excited at a wavelength of 633 nm. The reflected light signal of gold nanoparticles could be clearly shown in different intestinal epithelial cells no matter when they were in fixed or in living state, and the intracellular trafficking and distribution of gold nanoparticles were clearly shown in three-dimensional image. Meanwhile, this method was also applied to rat small intestine in vivo. In conclusion, we believed that this technique was a convenient and precise way to explore the transport behavior of gold nanoparticles via oral administration without fluorescent dye.
Terbium (Tb) has been extensively used as a fluorescence probe for the identification of calcium-binding sites in proteins and for fluorometric analysis of organic ligands. In the current study, we reported that HEP...
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Terbium (Tb) has been extensively used as a fluorescence probe for the identification of calcium-binding sites in proteins and for fluorometric analysis of organic ligands. In the current study, we reported that HEPES, a commonly used pH buffer reagent, significantly enhanced the characteristic emission of Tb at 585 nm. The maximum emission of Tb at 490 nm and 549 um were also enhanced by HEPES to a less extent. Thus, cautions should be taken when quantitative analysis is performed based on the fluorescence emission of Tb at 549 nm, since the emission may vary due to the buffer reagents. Additionally, the fluorescence intensity at 585 um was proportional to the concentration of both HEPES and terbium ions, which might be utilized to develop new fluorometric analytical methods.
A series of O6-benzylguanine (O6-BG) derivatives was synthesized, and their in vitro AGT (O^6-Alkylguanine DNA alkyltransferase) inhibitory ability was evaluated by MTT method to investigate the possibility to be ...
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A series of O6-benzylguanine (O6-BG) derivatives was synthesized, and their in vitro AGT (O^6-Alkylguanine DNA alkyltransferase) inhibitory ability was evaluated by MTT method to investigate the possibility to be promising precursors of PET tracers. O^6--BG and its derivatives, HMBG, MOBG, MOMBG, BABP and PEG, were synthesized from guanine respectively. The AGT inhibitory ability of the compounds were tested by evaluating their effects on increasing sensitivity of HeLa cancer cells to 1,3-bis (2-chloroethyl)-l-nitrosourea (BCNU) with MTT method. Their order of AGT inhibitory activities follows HMBG ≥ O^6-BG ≥ MOBG ≥ MOMBG, whereas the BABP and PEG showed no AGT inhibition activity. HMBG, MOBG and MOMBG would be promising as precursor candidates of PET tracers for tumor imaging.
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