背景[1-6]
猴(NHP)單克隆抗體制備服務(wù)是利用噬菌體展示抗體庫構(gòu)建和篩選技術(shù)分離到了大量的針對(duì)不同靶點(diǎn)的NHP單克隆抗體。與嚙齒類動(dòng)物相比,猴屬于大型動(dòng)物且具有和人類相近的遺傳背景,使其成為基礎(chǔ)和應(yīng)用研究中非常關(guān)鍵的非人靈長類(NHP)模型動(dòng)物。猴(NHP)單克隆抗體制備服務(wù)不但可以為客戶解決了抗體研發(fā)中的難題,同時(shí)也可以為客戶的治療用途提供了大量有價(jià)值的抗體,并且開辟了抗體生產(chǎn)的新途徑。
噬菌體展示技術(shù)流程:
1.ScFv基因庫的獲得:收集目標(biāo)抗體宿主的免疫細(xì)胞,提取細(xì)胞總RNA;反轉(zhuǎn)錄后,使用多對(duì)引物分別擴(kuò)增抗體基因VH和VL,純化回收VH和VL片段后,使用Linker引物將全套VH和VL基因隨機(jī)拼接成ScFv基因庫;
2. ScFv基因庫轉(zhuǎn)化大腸桿菌:將全套 ScFv 基因片段連接至pCANTAB5e載體,隨后電轉(zhuǎn)化大腸桿菌TG1;同時(shí)鑒定ScFv基因庫庫容(及基因的插入率);
3.噬菌體ScFv抗體庫的構(gòu)建:將輔助噬菌體M13K07加入到轉(zhuǎn)入了ScFv抗體基因的,生長至對(duì)數(shù)生長期的大腸桿菌中進(jìn)行噬菌粒拯救;培養(yǎng)過夜后,離心收集上清即獲得噬菌體ScFv抗體庫;
4.抗體庫的滴度測定:取少量上述獲得的噬菌體ScFv抗體庫,梯度稀釋后進(jìn)行噬斑培養(yǎng)實(shí)驗(yàn),觀察噬斑生長情況以判斷噬菌體ScFv抗體庫的滴度;
5. 噬菌體抗體庫的富集篩選:使用靶標(biāo)抗原包被酶聯(lián)板,加入噬菌體抗體進(jìn)行孵育,隨后進(jìn)行洗板、洗脫;將洗脫下來的噬菌體抗體進(jìn)行中和后,再次感染細(xì)菌,并進(jìn)行第二輪的淘洗;共進(jìn)行3輪淘洗,每一輪洗脫后都進(jìn)行滴度測定;最后一輪篩選時(shí),設(shè)BSA包被的對(duì)照組以確定是否富集了大量抗BSA的噬菌體抗體。
噬菌體展示抗體庫構(gòu)建流程:
1. 免疫細(xì)胞收集,總RNA提取,反轉(zhuǎn)錄合成cDNA。
2. 以以上cDNA為模板,PCR擴(kuò)增抗體基因片段,并連接至載體(例如:pComb3或pCANTAB5e載體)。
3. 將已構(gòu)建好的載體電轉(zhuǎn)化至大腸桿菌菌株。
4. (1)以上轉(zhuǎn)化菌株復(fù)蘇后,梯度稀釋,并涂布平板,計(jì)算陽性克隆數(shù);(2)挑選10個(gè)陽性單克隆,提取質(zhì)粒后,進(jìn)行酶切驗(yàn)證;(3)通過陽性克隆數(shù)和酶切驗(yàn)證的結(jié)果,計(jì)算抗體庫庫容。
5. 通過輔助噬菌粒拯救獲得噬菌體展示抗體庫。
應(yīng)用[7][8]
1.用于猴單克隆抗體的相關(guān)研究
例如在利用單細(xì)胞PCR從免疫后中國獼猴篩選H7N9高親和力中和抗體的實(shí)驗(yàn)中需要用ELISA法檢測抗原抗體親和力。而H7N9高親和力猴單克隆抗體的制備就需要用猴(NHP)單克隆抗體制備服務(wù)來縮短抗體的制備時(shí)間。
2.用于猴單克隆抗體的相關(guān)研究Western Blot試劑盒的生產(chǎn)
參考文獻(xiàn)
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