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Toll-like Receptors Gene Expression in the Gastrointestinal Tract of Salmonella Serovar Pullorum-Infected Broiler Chicken

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Abstract

Salmonella enterica serovar Pullorum causes substantial mortality in chicks as well as results in persistent infection and vertical transmission in layer birds. An effective innate immune response in the early stages of infection could reduce bacterial colonization and mortality in chicks and persistency of infection in later stages. Toll-like receptors (TLRs), important components of innate immune response, plays a pivotal role in early recognition of pathogen as well as in the initiation of robust and specific adaptive immune response. In the present study, we quantified the expression levels of chicken TLRs (1LA, 1LB, 2A, 2B, 3, 4, 5, 7, 15, and 21) mRNA by quantitative real-time PCR in the gastrointestinal (GI) tissues (duodenum, jejunum, ileum, and cecum) of 3-day-old broiler chicks after 24 h of oral infection with S. enterica serovar Pullorum. We found significant upregulation of TLRs (TLR2, TLR4, TLR21) mRNA expressions in GI tract tissues after S. Pullorum infection. The exceptions were for TLR3 and TLR15 with decrease in the expression levels in the jejunum after infection. TLR4 gene expression was significantly (P < 0.05) upregulated in the duodenum and ileum of infected chicks. Gene expression for some of the TLRs (TLR1LA, ILB, 2B, and TLR5) remained unchanged after infection with S. Pullorum in all the GI tissues studied. Most substantial change in gene expression was found for TLR21, being significantly (P < 0.05) upregulated in all the tissues investigated. The differential expression levels of TLRs shed light on tailored innate immune response induced by S. Pullorum during the early stages of infection in chicks.

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Authors and Affiliations

  1. Immunology section, Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, 243122, India

    Kannaki T. Ramasamy & Premchandra Verma

  2. Project Directorate on Poultry, Hyderabad, Andhra Pradesh, 500030, India

    Maddula R. Reddy

Authors
  1. Kannaki T. Ramasamy
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  2. Premchandra Verma
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  3. Maddula R. Reddy
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Correspondence to Kannaki T. Ramasamy.

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Ramasamy, K.T., Verma, P. & Reddy, M.R. Toll-like Receptors Gene Expression in the Gastrointestinal Tract of Salmonella Serovar Pullorum-Infected Broiler Chicken. Appl Biochem Biotechnol 173, 356–364 (2014). https://doi.org/10.1007/s12010-014-0864-8

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  • DOI: https://doi.org/10.1007/s12010-014-0864-8

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