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Zhang J, Xiao H, Bi Y, Long Q, Gong Y, Dai J, Sun M, Cun W. Characteristics of the tree shrew humoral immune system. Mol Immunol 2020; 127:175-185. [PMID: 32992149 DOI: 10.1016/j.molimm.2020.09.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 09/02/2020] [Accepted: 09/07/2020] [Indexed: 12/12/2022]
Abstract
Preclinical studies require an immune response similar to that of humans in a small animal model that is convenient to operate. Based on genome alignment, tree shrews are small animals considered to be more similar to primates than are rodents, and many human disease models have been established with tree shrews. However, the characteristics of the humoral immune response of tree shrews remain to be elucidated. In this study, the genetic sequence of the heavy chain constant region of tree shrew immunoglobulin (Ig) was complemented, and the results of immunoglobulin domain homology and transcriptome analysis showed that the tree shrew genome encodes only four classes of antibodies and does not encode IgD. The oldest IgM antibody has the highest homology with primates. After the complete sequence of each type of antibody was obtained, the tree shrew antibody protein was further expressed and purified by in vitro recombination, and an IgG quantitative evaluation system was established. The highly effective immuno protective effect induced by HSV-1 infection and the significant bactericidal effect induced by Neisseria meningitidis group C polysaccharide immunization showed that tree shrews exhibited immune responses more similar to humans than to mice. This may provide better predictive value for vaccine preclinical research.
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Affiliation(s)
- Jingjing Zhang
- Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, China; Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, 935 Jiaoling Road, Kunming, 650118, Yunnan, China
| | - Hongjian Xiao
- Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, China; Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, 935 Jiaoling Road, Kunming, 650118, Yunnan, China
| | - Yanwei Bi
- Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, China; Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, 935 Jiaoling Road, Kunming, 650118, Yunnan, China
| | - Qiong Long
- Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, China; Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, 935 Jiaoling Road, Kunming, 650118, Yunnan, China
| | - Yue Gong
- Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, China; Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, 935 Jiaoling Road, Kunming, 650118, Yunnan, China
| | - Jiejie Dai
- Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, China; Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, 935 Jiaoling Road, Kunming, 650118, Yunnan, China
| | - Ming Sun
- Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, China; Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, 935 Jiaoling Road, Kunming, 650118, Yunnan, China
| | - Wei Cun
- Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, China; Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, 935 Jiaoling Road, Kunming, 650118, Yunnan, China.
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