高效液相色谱法测定醉鱼草甙

目的：测定风轮菜属植物中醉鱼草甙的含量。方法：用高效液相色谱法（ＨＰＬＣ）对风轮菜属的几种原植物、风轮菜活性部位研究过程中呈现药理活性的几部分粗膏及断血流片进行醉鱼草甙的含量测定。色谱柱为Ｈｉ-ＴｅｃｈＣ_１８柱（２５０ｍｍ×４．６ｍｍ）,甲醇-水（７０∶３０）作流动相,检测波长在２１０ｎｍ。结果：不同样品所含醉鱼草甙的量有差异。平均回收率为１０１．３％,ＲＳＤ为１．７３％。结论：首次建立了醉鱼草甙的定量方法。     

Buddlejasaponin IV induces cell cycle arrest at G2/M phase and apoptosis in immortalized human oral keratinocytes

Buddlejasaponin IV (BS-IV), a major component of Pleurospermum kamtschaticum, exerts antiinflammatory and cytotoxic effects against cancer cells. The study investigated whether BS-IV could prevent oral carcinogenesis by inhibiting the growth of immortalized human oral keratinocytes (IHOKs). BS-IV reduced cell viability and induced cell cycle arrest at G2/M phase and apoptotic morphological changes in IHOKs. BS-IV inhibited the levels of cyclin B1, Cdc2 and Cdc25C, but enhanced Chk2 phosphorylation. The increased levels of pRb and p21 protein and the activation of p53 were also noted in BS-IV-treated IHOKs. In addition, BS-IV induced cytochrome c release from mitochondria by reducing antiapoptotic Bcl-2 levels and increasing pro-apoptotic Bax levels. BS-IV treatment resulted in the activation of caspase-9 and caspase-3. PARP cleavage was also clearly observed in the BS-IV-treated IHOKs. Furthermore, the expression of the Fas death receptor and Fas ligand was induced and procaspase-8 level was suppressed by BS-IV treatment. Taken together, BS-IV treatment inhibited the growth of IHOK cells via the induction of p53-dependent cell cycle arrest at the G2/M phase and apoptosis via both mitochondrial-dependent and death receptor-mediated pathways. Thus, BS-IV can be considered an excellent candidate for a chemopreventive agent to block the progression of HPV-induced oral carcinogenesis.