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Viruses 2015, 7(3), 1357-1372;

Changes of CD4+CD25+ Cells Ratio in Immune Organs from Chickens Challenged with Infectious Bursal Disease Virus Strains with Varying Virulences

State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Science, China Agricultural University, Beijing 100193, China
Author to whom correspondence should be addressed.
Academic Editor: Eric O. Freed
Received: 17 December 2014 / Revised: 8 February 2015 / Accepted: 16 February 2015 / Published: 20 March 2015
(This article belongs to the Section Animal Viruses)
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In the current study, we investigate changes in CD4+CD25+ cells in chickens during infectious bursal disease virus (IBDV) infection. The percentage of CD4+CD25+ cells in lymph organs, e.g., the thymus, spleen, bursa of Fabricius and peripheral blood, during the first 1–5 days post infection (dpi) was assessed by flow cytometry. The data revealed a remarkable decrease in the percentage of CD4+CD25+ cells in the thymus from 1 to 5 dpi and in the spleen during early infection. An increase of the percentage of CD4+CD25+ cells among peripheral blood lymphocytes was observed during the first two days of IBDV infection. Additionally, CD4+CD25+ cells infiltrated the bursa along with CD4+ cells after IBDV infection. Quantitative reverse transcription polymerase chain reaction (qRT-PCR) was used to measure the mRNA levels of immune-related cytokines in IBDV-infected thymus and bursa of Fabricius tissues. The data revealed that IBDV caused a significant increase in interleukin (IL)-10 mRNA levels, with the Harbin-1 strain (vvIBDV) inducing higher IL-10 expression than the Ts strain. Taken together, our data suggest that chicken CD4+CD25+ cells may participate in IBDV pathogenicity by migrating from their sites of origin and storage, the thymus and spleen, to the virally targeted bursa of Fabricius during IBDV infection. View Full-Text
Keywords: IBDV; CD4+CD25+ cells; migration; immune organs IBDV; CD4+CD25+ cells; migration; immune organs

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Yu, X.; Rui, L.; Shao, Q.; Liu, H.; Lu, Y.; Zhang, Y.; Li, Z. Changes of CD4+CD25+ Cells Ratio in Immune Organs from Chickens Challenged with Infectious Bursal Disease Virus Strains with Varying Virulences. Viruses 2015, 7, 1357-1372.

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