简介:Twonewcompounds,(22E)-25-carboxy-8β,14β-epoxy-4α,5α-dihydroxyergosta-2,22-dien-7-one(1)andfusidione(3),alongwithtwoknowncompounds,5α,8α-epidioxyergosta-6,22-diene-3β-ol(2)andmicroperfuranone(4),wereisolatedfromthefermentationproductsofthemarine-sourcedfungusAcremoniumfusidioidesRZ01.Thestructuresofcompounds1and3wereelucidatedbyextensivespectroscopicmethods,especially2DNMR,andtheirabsoluteconfigurationsweresuggestedonthebasisofthecirculardichroismspectralanalysisandtheNOESYdata.BothnewcompoundsshowedinhibitoryactivityagainstHL-60cellswithIC50valuesbeing16.6and44.9μmol·L-1,respectively.
简介:Inthisreview,weintensivelyfocusontheadvancesinresearchofnaturalproducts(NPs)discoverycarriedoutbydomesticscholarsinChinafrom2015through2017.Ingeneral,atotalof1811publications(1479inEnglishand332inChinese)wereaccumulatedregardingnewlyisolatedNPsfromplants,microorganisms,andmarinesources.Asaresult,277selectedpapersconcerningnaturallyoccurringcompoundswithextraordinaryframeworks,origins,andpromisingactivitieswerediscussedinthisreviewarticle,mainlyorganizedaccordingtotheirstructuralclassesandnovelties.
简介:目的:利用人脐静脉内皮细胞体外培养模型,探讨肾上腺素刺激状态下海带多糖L01对内皮细胞的保护作用,以及其对其分泌的组织型纤溶酶原激活物(t-PA)的影响,从内皮细胞抗血栓功能方面探讨海带多糖L01对心血管系统的保护作用。方法:体外培养人脐静脉内皮细胞系ECV-304,用肾上腺素刺激24h、48h、72h采样,ELISA法测定HUVECs培养上清液中的t-PA含量,逆转录多聚酶链反应(RT-PCR)检测HUVEC细胞内t-PAmRNA的表达,其扩增产物经电泳后密度扫描及半定量分析。结果:肾上腺素模型组HUVECs培养液中t-PA(24h、48h)含量明显增加,;单给海带多糖对HUVECst-PA分泌无影响。海带多糖L01在肾上腺素刺激下给药24h,48h后t-PA抗原分泌明显降低(P〈0.01),且具有一定的量效关系,但HUVECst-PAmRNA表达各组均无明显差异。结论:肾上腺素可刺激内皮细胞分泌t-PA抗原,海带多糖L01对血管内皮具有一定的保护作用,减少肾上腺素刺激下HUVECs分泌t-PA,而对t-PAmRNA表达无明显影响。