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Establishment of a Double-antibody Sandwich ELISA for Detection of S100A8 in Forest Musk Deer (Moschus berezovskii) |
SUO Li-Juan1,2,3, BIAN Kun1,2,3, LI Fei-Ran1,2,3, YANG Chao1,2,3, TANG Jie1,2,3,* |
1 Shaanxi Key Laboratory of Qinling Ecological Security, Shaanxi Institute of Zoology, Xi'an 710032, China; 2 Baoji City Forest Musk Engineering Technology Research Center, Feng County 721700, China; 3 Foping county forest musk expert workstation, Foping County 723400, China |
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Abstract The forest musk deer (Moschus berezovskii), a first-class protected animal in China, has musk secreted by its male that holds significant medicinal value. The S100A8 protein, as a member of the calcium - binding protein family, plays a crucial role in the inflammatory response. Therefore, to meet the health - monitoring needs in the artificial breeding of forest musk deer, a double-antibody sandwich ELISA for S100A8 was established to detect S100A8 in the serum samples of forest musk deer.In this study, the prokaryotic expression vector pET28a-B2M was constructed to obtain the S100A8 recombinant protein. Rabbit-derived polyclonal antibodies were obtained by multi-point injection into New Zealand white rabbits (Oryctolagus cuniculus). Mouse-derived S100A8 monoclonal antibodies were prepared through hybridoma technology and used as capture antibodies. The horseradish peroxidase (HRP) labeled rabbit-derived S100A8 polyclonal antibodies were used as detection antibodies. A double-antibody sandwich ELISA quantitative detection method for S100A8 in musk deer was established, and the antibody concentration, optimal coating conditions of the capture antibody and incubation conditions were optimized. The established ELISA method was used to specifically detect 31 serum samples.The results showed that the concentration of the recombinant protein obtained by Ni2+ column affinity chromatography was 5 mg/mL, with a purity of over 85%. Indirect ELISA indicated that the titers of both mouse and HRP-rabbit anti-S100A8 antibodies were higher than 1∶50 000. When the concentration of the capture antibody was 4 μg/mL and the dilution ratio of the detection antibody was 1∶2 000, these were the optimal coating concentration of the capture antibody and the working concentration of the detection antibody. The minimum sensitivity of the double-antibody sandwich ELISA method established in this study was 15.625 ng/mL, and it could specifically distinguish between inflammatory samples and normal samples. A double-antibody sandwich ELISA detection method was successfully established to achieve the quantitative detection of S100A8 protein in samples. It is expected to be applied to comprehensively evaluate the health status of forest musk deer and provide support for the early diagnosis and treatment of diseases.
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Received: 14 November 2024
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Corresponding Authors:
*yaya184@xab.ac.cn
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