抑制腸上皮細胞O型糖鏈的合成減少細菌的粘附及其MUC2表達
[Abstract]:Background and objective: the gut is unique in the body and has been colonized by a large number of microorganisms, especially bacteria. As the key medium of host-bacteria interaction, mucus is an important barrier between lumen microbes and underlying immune cells. Intestinal mucus is mainly composed of mucin 2 (MUC2), an important member of mucin family. Lack of Muc2 in mice leads to mucous layer deficiency in colon, but does not restrict bacterial adhesion to mucous tissue, which may lead to severe spontaneous colitis and colorectal cancer in mice. As the main component of mucin, polymer mass O-ligand glycoprotein is widely expressed in various parts of human body and plays many important roles in physiological and pathological processes. Mucin type O-glycans mainly contains four different types of Core1,Core2,Core3 and Core4. Core1O-glycans is the main O-glycans and expressed in most tissues. The absence of Core1O-glycans seriously damaged the formation of mucus layer and induced spontaneous intestinal inflammation in mice. However, it is unclear how O-glycans promotes the integrity of mucus barrier and maintains the homeostasis of intestinal environment by interacting with intestinal flora. In this study, benzyl- 偽 -galactosamine (benzyl- 偽 -GalNAc) was used to treat HT-29 of colon cancer epithelial cells and differentiated HT-29-Gal, cells to observe (enterohemorrhagicEscherichia coli serotvpe O157:H7or EHEC O157:H7 and (enteropathogenic Escherichia coli or EPEC) of enterogenic Escherichia coli. The change of cell adhesion behavior; The RNA interference of Core1 synthase (C1GALT1) was carried out on HT-29 cells and a stable transfected cell line was established to create necessary conditions for further observation of the adhesion of intestinal epithelial cells inhibited by Core1 synthase to bacteria. By studying the interaction between O-glycans and pathogenic microorganisms on mucin molecules, we can understand the pathogenesis of inflammatory bowel disease (IBD), which has a growing prevalence. Methods: 1. HT-29 of colon cancer epithelial cells was induced by galactose to obtain differentiated cells HT-29-Gal. 2. HT-29 and HT-29-Gal cells were treated with benzyl- 偽 -GalNAc. 3. The expression of MUC2 in HT-29-Gal and benzyl- 偽 -GalNAc treated with HT-29-Gal and benzyl- 偽 -GalNAc was detected by Western blot and Real-time PCR methods. 4. Four kinds of cells of HT-29,HT-29-Gal,HT-29-OBN and HT-29-Gal-OBN were co-cultured with Escherichia coli EHEC O157:H7 and EPEC, respectively. A series of dilution colony counting and immunofluorescence staining methods were used to observe the adhesion of bacteria to the above four cell surfaces. 5. 5. The interfering plasmid of Core1 synthase (C1GALT1) was constructed and transfected into HT-29 cells with high expression of Core1 synthase and screened by G418. Results: 1. The results of Western blot and Real-time PCR showed that the expression of MUC2 protein and mRNA in HT-29-OBN and HT-29-Gal-OBN cells treated with benzyl- 偽 -GalNAc was significantly lower than that in HT-29 and HT-29-Gal cells. The adhesion of HT-29-Gal-OBN and HT-29-OBN cells to Escherichia coli EHEC O157:H7 or EPEC was significantly lower than that of corresponding HT-29-Gal and HT-29 cells. Stable transfected C1GALT1 silenced HT-29 cells were obtained. Conclusion: inhibiting the synthesis of O-type sugar chain in intestinal epithelial cells and reducing the expression of MUC2 and the adhesion of bacteria.
【學(xué)位授予單位】:第三軍醫(yī)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:R574
【共引文獻】
相關(guān)期刊論文 前10條
1 王培培;于廣利;焦廣玲;趙峽;李靜;柴文剛;;基于MALDI-TOF質(zhì)譜技術(shù)分析人宮頸癌HeLa細胞N-糖鏈結(jié)構(gòu)輪廓[J];高等學(xué)校化學(xué)學(xué)報;2012年06期
2 葉鈞;宋麗麗;劉韻;田音;潘瓊;彭志紅;汪榮泉;;腸分化細胞黏蛋白O-型糖鏈合成抑制導(dǎo)致MUC2表達減低以及對細菌侵襲易感[J];第三軍醫(yī)大學(xué)學(xué)報;2013年19期
3 劉韻;葉鈞;宋麗麗;田音;潘瓊;彭志紅;汪榮泉;;Core 2和Core 4 O-型糖鏈參與大腸桿菌對腸上皮細胞的黏附與侵襲[J];第三軍醫(yī)大學(xué)學(xué)報;2014年02期
4 莊則豪,王立東,高珊珊,范宗民,宋子博,齊義軍,李燕杰,李吉學(xué);河南食管癌高發(fā)區(qū)食管和賁門癌組織中粘蛋白1的表達[J];鄭州大學(xué)學(xué)報(醫(yī)學(xué)版);2002年06期
5 向松濤,周四維;粘蛋白在膀胱癌診斷和治療中應(yīng)用的研究進展[J];臨床泌尿外科雜志;2002年03期
6 周兵,李家邦,戴幸平;黏蛋白與胃黏膜屏障[J];臨床消化病雜志;2005年03期
7 向松濤,周四維,管維,王勤章,張保,劉繼紅,葉章群;腫瘤浸潤性樹突狀細胞與粘蛋白MUC1在前列腺癌與前列腺增生中的表達研究[J];中華男科學(xué);2003年07期
8 宋麗麗;葉鈞;劉韻;潘瓊;鐘小莉;李姍姍;田音;彭志紅;汪榮泉;;O型糖鏈合成阻滯對腸上皮細胞MUC2表達及細菌黏附的抑制作用[J];解放軍醫(yī)學(xué)雜志;2013年10期
9 向松濤;周四維;管維;張旭;劉繼紅;莊乾元;葉章群;;糖蛋白(MUC1與MUC7)基因在膀胱移行細胞癌的表達研究[J];中華實驗外科雜志;2006年02期
10 Yoshinori Inagaki;Norihiro Kokudo;Yasuji Seyama;Munehiro Nakata;Hiroshi Imamura;Keiji Sano;Yasuhiko Sugawara;Masatoshi Makuuchi;;KL-6 mucin expression in carcinoma of the ampulla of Vater: Association with cancer progression[J];World Journal of Gastroenterology;2005年35期
相關(guān)博士學(xué)位論文 前5條
1 王光海;FADD基因遺傳多態(tài)與子宮頸癌易感性[D];中國協(xié)和醫(yī)科大學(xué);2009年
2 陳焰;大鼠化學(xué)誘導(dǎo)性結(jié)腸炎模型的建立及云母干預(yù)治療機制探討[D];浙江大學(xué);2008年
3 許煥麗;“KL-6 mucin”在消化系統(tǒng)腫瘤中的表達、臨床意義及機制研究[D];山東大學(xué);2010年
4 王培培;動物組織中微量糖鏈結(jié)構(gòu)分析方法的建立及應(yīng)用[D];中國海洋大學(xué);2012年
5 章文明;仔豬源高粘附性乳酸桿菌的分離鑒定、腸道定植及其粘附相關(guān)表面蛋白功能分析[D];浙江大學(xué);2014年
相關(guān)碩士學(xué)位論文 前10條
1 劉玉霞;MUC2和CD24蛋白在卵巢上皮性癌組織中的表達及其意義[D];鄭州大學(xué);2010年
2 儲瑋;肝癌患者和健康人血清中甘露糖結(jié)合蛋白的分離純化與鑒定[D];西北大學(xué);2011年
3 李姝;Cdx2和MUC2在反流性食管炎、Barrett食管和食管腺癌中的表達[D];天津醫(yī)科大學(xué);2005年
4 張君華;ST3GalV(GM3合成酶)與腫瘤轉(zhuǎn)移的關(guān)系的研究[D];中國海洋大學(xué);2006年
5 葛宇清;O-GlcNAc糖基轉(zhuǎn)移酶對小鼠乳腺癌細胞遷移的影響[D];中國海洋大學(xué);2007年
6 劉晨;基于基因芯片技術(shù)的肝癌糖類相關(guān)基因表達譜研究[D];西北大學(xué);2009年
7 李飛;甘草甜素對人膀胱癌細胞T24的抑制作用及其機制研究[D];河北醫(yī)科大學(xué);2010年
8 陳建平;β-1,4-半乳糖基轉(zhuǎn)移酶-Ⅰ在大鼠中樞神經(jīng)系統(tǒng)炎癥反應(yīng)中的表達及意義[D];南通大學(xué);2009年
9 董婷婷;降解草酸益生菌的篩選及其對實驗動物的功效研究[D];大連醫(yī)科大學(xué);2012年
10 朱影;ST6Gal-I通過上調(diào)整合素β1的唾液酸化促進絨毛膜癌細胞的遷移[D];重慶醫(yī)科大學(xué);2013年
本文編號:2228599
本文鏈接:http://sikaile.net/yixuelunwen/xiaohjib/2228599.html