鸡细胞周期检验点激酶2(cChk2)单克隆抗体制备和鉴定

Preparation and identification of monoclonal antibodies against chicken cell cycle checkpoint kinase 2(cChk2)

目的制备特异性鸡细胞周期检验点激酶2(cChk2)单克隆抗体(m Ab)。方法反转录PCR扩增cChk2基因,将其克隆入原核表达质粒p GEX-4T-3中,在BL21(DE3)中经异丙基硫代半乳糖苷(IPTG)诱导表达,经SDS-PAGE检测可溶性。用cChk2腹腔免疫BALB/c小鼠,利用间接免疫荧光法(IFA)和Western blot法检测抗血清;血清检测阳性后,取小鼠脾脏与小鼠骨髓瘤细胞Sp2/0融合,利用IFA和有限稀释法筛选阳性单克隆杂交瘤细胞株。结果 cChk2主要以包涵体形式存在,多抗血清具有良好的效价,获得9株阳性杂交瘤细胞株,即1F4、2D9、2G1、3D9、3E3、4B5、4E2、5C9及5F7。结论成功制备了特异性良好的cChk2 m Ab。

Objective To prepare monoclonal antibodies （mAbs） against chicken cell cycle checkpoint kinase 2 （cChk2）. Methods The cChk2 gene was amplified by reverse transcription PCR （RT-PCR） and subcloned into the prokaryotic expression vector pGEX-4T-3. After induced by IPTG, cChk2 was expressed in BL21 （DE3） E. coli cells and analyzed by SDS-PAGE to determine its soluability. BALB/c mice were immunized with cChk2 protein peritoneally. Indirect immunofluorescence assay （IFA） and Western blotting were used to detect anti-serum; if the detection result was positive, IFA and limited dilution was performed to screen hybridoma clones that produced antibodies against cChk2. Results cChk2 was mainly expressed in inclusion bodies. The anti-sera were able to recognize Chk2. Nine positive hybridoma clones were obtained and identified as 1F4, 2139, 2G1, 3D9, 3E3, 4B5, 4E2, 5C9 and 5F7. Conclusion The study has prepared mAbs against cChk2 with a good specificity and a high titer.