title: Age-related changes and distribution of T cell markers (CD3 and CD4) and toll-like receptors(TLR2, TLR3,TLR4 and TLR7) in the duck lymphoid organs.
abstract: T lymphocytes and Toll-like receptors have been confirmed to have correlation with the ability to resistance to pathogenic challenges and play an important role in duck immune system. However, the information of ontogeny of T lymphocytes and Toll-like receptors is scarcely in duck. Therefore, to address these questions, we report the development and distribution of CD3 and CD4 by immunocytochemistry and the age-related mRNA level of duck T cell markers (CD3 and CD4) and Toll-like receptors (TLR2, TLR3, TLR4 and TLR7) by real time quantitative PCR in duck lymphoid organs (thymus, bursa of Fabricius and spleen). Results indicated that CD3 and CD4 positive cells can be observed in all test organs and partly change in an age-related way. CD4 positive T cell of duck spleen mainly distributed in periarterial lymphatic sheaths and red pulp, not in white pulp. Both of CD3 and CD4 were experienced significant increased wave twice in duck lymphoid organs and T cell dependent cellular immunity of duck may well established until 5 weeks old. The mRNA expression levels of duck TLRs were age and organ dependent, and duck TLR3 and TLR7 were significantly lower abundance in the spleen but higher in thymus and bursa of Fabricius, respectively. This study provide the essential knowledge of the ontogeny of T cells and Toll-like receptors in duck, which may shed lights on the T-cell mediate immunity and innate immunity in duck.
authors.affiliation: College of Veterinary Medicine, South China Agricultural University,483 Wushan Street, Tianhe District, Guangzhou, Guangdong 510642, China.
authors.forename: Aiguo
authors.initials: A
authors.lastname: Zhang
authors.affiliation: Guangdong Enterprise Key Laboratory of Biotechnology R&D of Veterinary Biologics, Guangdong, Zhaoqing 526238, China.
authors.forename: Jiahua
authors.initials: J
authors.lastname: Xu
authors.affiliation: Guangdong Enterprise Key Laboratory of Biotechnology R&D of Veterinary Biologics, Guangdong, Zhaoqing 526238, China.
authors.forename: Hanzhang
authors.initials: H
authors.lastname: Lai
authors.affiliation: Guangdong Enterprise Key Laboratory of Biotechnology R&D of Veterinary Biologics, Guangdong, Zhaoqing 526238, China.
authors.forename: Wenke
authors.initials: W
authors.lastname: Huang
authors.affiliation: College of Veterinary Medicine, South China Agricultural University,483 Wushan Street, Tianhe District, Guangzhou, Guangdong 510642, China.
authors.forename: Niran
authors.initials: N
authors.lastname: Fang
authors.affiliation: College of Veterinary Medicine, South China Agricultural University,483 Wushan Street, Tianhe District, Guangzhou, Guangdong 510642, China. Electronic address: chensa727@126.com.
authors.forename: Ruiai
authors.initials: R
authors.lastname: Chen
mesh_terms: D000375:Aging / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D000818:Animals; D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism*; D015415:Biomarkers; D004372:Ducks; D015870:Gene Expression; D020869:Gene Expression Profiling; D007150:Immunohistochemistry; D008221:Lymphoid Tissue / Q000276:immunology / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism*; D051195:Toll-Like Receptor 2 / Q000378:metabolism; D051196:Toll-Like Receptor 3 / Q000378:metabolism; D051197:Toll-Like Receptor 4 / Q000378:metabolism; D051199:Toll-Like Receptor 7 / Q000378:metabolism; D051193:Toll-Like Receptors / Q000235:genetics / Q000378:metabolism*
chemical_list: D015703:Antigens, CD; D015415:Biomarkers; D012333:RNA, Messenger; D051195:Toll-Like Receptor 2; D051196:Toll-Like Receptor 3; D051197:Toll-Like Receptor 4; D051199:Toll-Like Receptor 7; D051193:Toll-Like Receptors
keywords: Age-related distribution; Duck; Lymphoid organs; T cell; Toll-like receptors; mRNA expression