本文關鍵詞：抗TNF-α多價抗體的構建及體內(nèi)外生物學活性研究　出處：《中國協(xié)和醫(yī)科大學》2005年博士論文　論文類型：學位論文

  更多相關文章： TNF- 多價 抗體 構建 內(nèi)外 生物學 活性 研究

【摘要】：腫瘤壞死因子α(TNF-α)是上世紀70年代發(fā)現(xiàn)的一個細胞因子，最初發(fā)現(xiàn)它能引起某些特定的腫瘤組織的出血性壞死，現(xiàn)在已經(jīng)知道它除了具有抗腫瘤作用外，還在機體的免疫、炎癥和病理中發(fā)揮重要的作用。TNF-α的拮抗劑包括中和性的抗體已被證明是急性膿毒血癥、類風濕關節(jié)炎，局部性回腸炎和牛皮癬等急慢性炎癥性疾病的有效治療劑。美國FDA已批準了Etanercept、Infliximab和Adalimumab這三種抗TNF-α的生物治療劑，其中后兩種為抗TNF-α的單克隆抗體�？贵w工程技術經(jīng)歷了鼠源雜交瘤抗體、人-鼠嵌合抗體、人源化抗體和人源抗體的發(fā)展階段，而上世紀80年代基因工程技術的興起使構建基因工程的小分子抗體如Fab、scFv及單域抗體等成為現(xiàn)實，這些小分子抗體由于分子量小、穿透性強、易于構建并可在大腸桿菌等原核系統(tǒng)中功能性的表達而具有廣闊的應用前景。本研究通過基因工程的方法構建了具有中和活性的抗TNF-α的單鏈抗體，對其生物學活性進行了研究，并在此基礎上對單鏈抗體進行了多價化，對多價抗體的體內(nèi)外生物活性進行了研究，為開發(fā)新的抗TNF-α治療劑打下了基礎。 一、抗TNF-α單鏈抗體TNF-scFv的構建及體外活性研究 單鏈抗體是一種將抗體的重鏈可變區(qū)(VH)和輕鏈可變區(qū)(VL)通過一段連接肽連接起來而形成的重組蛋白。本研究利用連接肽(GGGGS)_3將抗TNF-α的單克隆抗體Di62的VH和VL連接起來，設計成為完整的單鏈抗體的氨基酸序列，然后根據(jù)設計的氨基酸序列以大腸桿菌偏愛的密碼子將其反向翻譯成編碼的DNA序列。根據(jù)編碼的DNA序列，合成了22個寡核苷酸片段并用裝配PCR的方法將這22個寡核苷酸片段拼接成的完整的單鏈抗體編碼基因，在編碼基因的兩端加上了克隆所需要的酶切位點。將此編碼基因克隆進載體pTCM-2，通過陽性克隆的鑒定和序列測定，構建了單鏈抗體TNF-scFv的表達載體，命名為pTS。將載體pTS轉(zhuǎn)化大腸桿菌BL21(DE3)star，，利用0.4mM的IPTG誘導目
[Abstract]:Tumor necrosis factor- 偽 (TNF- 偽) is a cytokine found in -30s, which was initially found to cause hemorrhagic necrosis in certain tumor tissues. It is now known that in addition to its antitumor effects, it also plays an important role in the body's immunity, inflammation and pathology. TNF- 偽 antagonists, including neutralizing antibodies, have been shown to be acute sepsis. An effective treatment for acute and chronic inflammatory diseases such as rheumatoid arthritis, local colitis and psoriasis. The United States FDA has approved Etanercept. Infliximab and Adalimumab are three biotherapeutic agents against TNF- 偽. The latter two are monoclonal antibodies against TNF- 偽. The antibody engineering technology has experienced the development of murine hybridoma antibody, human-mouse chimeric antibody, humanized antibody and human antibody. In -20s, the rise of genetic engineering technology made the construction of small molecular antibodies such as FabscFv and single-domain antibodies become a reality. These small molecular antibodies have high penetration due to their small molecular weight. It is easy to construct and can be expressed in E. coli and other prokaryotes. In this study, a neutralizing single-chain antibody (scFv) against TNF- 偽 was constructed by genetic engineering. The biological activity of the antibody was studied, and on the basis of this, the single-chain antibody was polyvalent, and the biological activity of the polyvalent antibody in vivo and in vitro was studied. It lays a foundation for the development of a new anti-TNF- 偽 therapeutic agent. 1. Construction and in vitro activity of anti-TNF- 偽 scFv TNF-scFv Single chain antibody (scFv) is a recombinant protein formed by linking the heavy chain variable region (VH) and the light chain variable region (VLH) of the antibody via a linked peptide. The VH and VL of Di62, a monoclonal antibody against TNF- 偽, were linked together. The amino acid sequence of scFv was designed to be complete, and then reverse translated into the encoded DNA sequence according to the designed amino acid sequence with the preferred codon of Escherichia coli. According to the encoded DNA sequence. Twenty-two oligonucleotide fragments were synthesized and the 22 oligonucleotide fragments were spliced into a complete single-chain antibody coding gene by assembling PCR. The encoding gene was cloned into the vector pTCM-2 and identified and sequenced by positive cloning. The expression vector of scFv TNF-scFv was constructed and named pTS.The vector pTS was transformed into Escherichia coli BL21DE3DE-star. the target was induced by 0.4mm IPTG.
【學位授予單位】：中國協(xié)和醫(yī)科大學
【學位級別】：博士
【學位授予年份】：2005
【分類號】：R392

【引證文獻】

相關碩士學位論文 前1條

1 馬玲;抗CD22人源化基因工程多價微型抗體的初步表達[D];廣西大學;2007年

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