Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0145-305X(03)00103-4
Title: Development and maturation of the immune system in zebrafish, Danio rerio: A gene expression profiling, in situ hybridization and immunological study
Authors: Lam, S.H. 
Chua, H.L.
Gong, Z. 
Lam, T.J. 
Sin, Y.M. 
Keywords: Humoral immunity
Ikaros
Immune system maturation
Immunoglobulin light chain constant region isotypes
Recombination activating gene-1
T-cell receptor alpha constant region
Zebrafish
Issue Date: Jan-2004
Citation: Lam, S.H., Chua, H.L., Gong, Z., Lam, T.J., Sin, Y.M. (2004-01). Development and maturation of the immune system in zebrafish, Danio rerio: A gene expression profiling, in situ hybridization and immunological study. Developmental and Comparative Immunology 28 (1) : 9-28. ScholarBank@NUS Repository. https://doi.org/10.1016/S0145-305X(03)00103-4
Abstract: The development and maturation of the immune system in zebrafish was investigated using immune-related gene expression profiling by quantitative real-time polymerase chain reaction, in situ hybridization (ISH), immunoglobulin (Ig) detection by immuno-affinity purification and Western blotting as well as immersion immunization experiments. Ikaros expression was first detected at 1 day post-fertilization (dpf) and thereafter increased gradually to more than two-fold between 28 and 42dpf before decreasing to less than the initial 1dpf expression level in adult fish (aged 105dpf). Recombination activating gene-1 (Rag-1) expression levels increased rapidly (by 10-fold) between 3 and 17dpf, reaching a maximum between 21 and 28dpf before decreasing gradually. However, in adult fish aged 105dpf, the expression level of Rag-1 had dropped markedly, and was equivalent to the expression level at 3dpf. T-cell receptor alpha constant region and immunoglobulin light chain constant region (IgLC) isotype-1, 2 and 3 mRNAs were detected at low levels by 3dpf and their expression levels increased steadily to the adult range between 4 and 6 weeks post-fertilization (wpf). Using tissue-section ISH, Rag-1 expression was detected in head kidney by 2wpf while IgLC-1, 2 and 3 were detected in the head kidney and the thymus by 3wpf onwards. Secreted Ig was only detectable using immuno-affinity purification and Western blotting by 4wpf. Humoral response to T-independent antigen (formalin-killed Aeromonas hydrophila) and T-dependent antigen (human gamma globulin) was observed in zebrafish immunized at 4 and 6wpf, respectively, indicating that immunocompetence was achieved. The findings reveal that the zebrafish immune system is morphologically and functionally mature by 4-6wpf. © 2003 Published by Elsevier Ltd.
Source Title: Developmental and Comparative Immunology
URI: http://scholarbank.nus.edu.sg/handle/10635/100437
ISSN: 0145305X
DOI: 10.1016/S0145-305X(03)00103-4
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