Direct Construction of an Open-Sandwich Enzyme Immunoassay for One-Step Noncompetitive Detection of Thyroid Hormone T4

被引:34
作者
Islam, Kamrun Nahar [1 ]
Ihara, Masaki [2 ]
Dong, Jinhua [1 ]
Kasagi, Noriyuki [3 ]
Mori, Toshihiro [3 ]
Ueda, Hiroshi [1 ,2 ]
机构
[1] Univ Tokyo, Dept Chem & Biotechnol, Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan
[2] Univ Tokyo, Dept Bioengn, Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan
[3] Fujifilm Co, Lifesci Lab R&D, Kaisei Machi, Kanagawa 2588577, Japan
关键词
ANTIBODY VARIABLE REGION; INTERCHAIN INTERACTION; CHEMI-LUMINESCENCE; SERUM THYROXINE; BLOOD-SAMPLES; FILTER-PAPER; PROTEIN; SYSTEM; ELISA; RADIOIMMUNOASSAY;
D O I
10.1021/ac102801r
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
To establish a sensitive noncompetitive immunoassay for thyroxine (T4), we attempted to isolate anti-T4 antibodies from a pillage display library based on a phagemid pDong1 (Dong et al. Anal. Biochem. 2009, 36, 386), which was designed to enable open-sandwich enzyme-linked immunosorbent assay (OS-ELISA) after selection on immobilized antigen. After the Fab-displaying phage library made from the splenocytes of T4-KLH immunized mice was subjected to biopanning on T4-BSA, two T4-specific clones were obtained. When they were assayed by indirect competitive ELISA, both clones showed low IC50 (5-13 ng/mL), indicating their high affinity to T4. When they were used for OS-ELISA that detects antigen-dependency of the interaction between variable domains V-H and V-L, a clone successfully detected 1 ng/mL of T4 with a working range superior to that of competitive IA. OS-ELISA was also performed with maltose binding protein (MBP) fused V-H/V-L of this clone, which showed a detection limit less than 0.1 ng/mL T4. Moreover, the assay showed cross-reactivity with T3 similar to that of competitive ELISA, and also gave a reasonable total serum T4 concentration (90 ng/mL) from ethanol-extracted sample serum using the recombinant proteins. This is the first direct construction of an OS-ELISA system bypassing hybridoma, which will be applicable to the detection of many other small molecule antigens.
引用
收藏
页码:1008 / 1014
页数:7
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