| 7 | Pun1蛋白的辣椒素合酶活性及其作为辣椒素积累决定因素的证据显示文摘背景:辣椒素类物质,包括辣椒素及其类似物,是导致辣椒果实辛辣的原因。尽管辣椒素为人熟知并且每天都会用到,但是对于辣椒素合成途径中的相关基因并不是完全了解。已有研究表明,p AMT和Pun1编码的蛋白分别催化辣椒素合成途径中的第二步和最后一步反应,并且Pun1编码的蛋白具有辣椒素合酶活性。然而,并没有直接的证据证明Pun1具有辣椒素合酶活性。结果:为了证明Pun1蛋白在辣椒素合成中的作用,我们利用大肠杆菌合成了抗Pun1蛋白抗体,利用该抗体拮抗内源的Pun1活性。同时通过病毒介导的基因沉默技术靶定了Pun1的m RNA,以确认抗Pun1抗体的特异性。在Pun1下调表达的胎座组织中,利用该抗体进行western blot,检测到Pun1蛋白的积累减少,同时辣椒素在胎座中的积累量也降低。从胎座组织中分离得到原生质体,在体外进行辣椒素的从头合成,加入抗Pun1抗体之后,辣椒素的合成受到抑制。通过分析不同辣椒品种的p AMT和Pun1的表达,我们发现辣椒素的高水平积累总是伴随着p AMT和Pun1的高水平表达,也就是说这两个基因对辣椒素合成很重要。比较有辣味辣椒和无辣味辣椒的香草基胺(辣椒素合成的前体物质)和辣椒素的积累水平,结果表明:在辛辣味辣椒中香草基胺的含量很低,推测可能是香草基胺合成之后,Pun1把香草基胺快速转化为辣椒素;而在无辣味辣椒中由于缺乏Pun1,香草基胺的含量积累到很高的水平。结论:对辣椒素从头合成途径和抗Pun1抗体进行原生质体试验,证明了Pun1基因及其产物参与了辣椒素的合成。与辣椒素的积累相比较,分析香草基胺的积累过程,揭示了Pun1是辣椒素和香草基胺积累水平的决定因素。 | Kana Ogawa Katsunori Murota Hanako Shimura Misaki Furuya Yasuko Togawa Takeshi Matsumura Chikara Masuta 马义花 孔秋生 | 2015 | 辣椒杂志2015，，2： | 0 |
| 8 | High-grade pancreatic intraepithelial neoplasia diagnosed based on changes in magnetic resonance cholangiopancreatography findings:A case report显示文摘BACKGROUND High-grade pancreatic intraepithelial neoplasia(PanIN)exhibits no mass and is not detected by any examination modalities.However,it can be diagnosed by pancreatic juice cytology from indirect findings.Most previous cases were diagnosed based on findings of a focal stricture of the main pancreatic duct(MPD)and caudal MPD dilatation and subsequent pancreatic juice cytology using endoscopic retrograde cholangiopancreatography(ERCP).We experienced a case of high-grade PanIN with an unclear MPD over a 20-mm range,but without caudal MPD dilatation on magnetic resonance cholangiopancreatography(MRCP).CASE SUMMARY A 60-year-old female patient underwent computed tomography for a follow-up of uterine cancer post-excision,which revealed pancreatic cysts.MRCP revealed an unclear MPD of the pancreatic body at a 20-mm length without caudal MPD dilatation.Thus,course observation was performed.After 24 mo,MRCP revealed an increased caudal MPD caliber and a larger pancreatic cyst.We performed ERCP and detected atypical cells suspected of adenocarcinoma by serial pancreatic juice aspiration cytology examination.We performed a distal pancreatectomy and obtained a histopathological diagnosis of high-grade PanIN.Pancreatic parenchyma invasion was not observed,and curative resection was achieved.CONCLUSION High-grade Pan-IN may cause MPD narrowing in a long range without caudal MPD dilatation. | Nao Furuya Atsushi Yamaguchi Naohiro Kato Syuhei Sugata Takuro Hamada Takeshi Mizumoto Yuzuru Tamaru Ryusaku Kusunoki Toshio Kuwai Hirotaka Kouno Kazuya Kuraoka Yoshiyuki Shibata Sho Tazuma Takeshi Sudo Hiroshi Kohno Shiro Oka | 2024 | World Journal of Clinical Cases2024，12，8： | 0 |
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