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TLR-4 signalling pathway: MyD88 independent pathway up-regulation in chicken breeds upon LPS treatment

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Abstract

Toll-like receptors (TLRs) that sense the microbial pathogens are important components of host immune system. TLRs play key roles in the innate defence mechanism against pathogens, in the development of adaptive immunity, and are possibly the major determinants of the susceptibility to infections. To study the resistance pattern in different breeds of chicken, a comprehensive understanding of TLR4 signalling pathways is required. We investigated the TLR-4 pathway regulated gene expressions in PBMCs of chicken breeds of Broiler (Cobb), Aseel, Dahlem Red and Ghagus upon LPS treatment using Quantitative RT-PCR approach. Several genes were found to be up regulated in both TLR-induced MyD88-dependent and MyD88-independent pathways. These genes include TLR4 (Toll-like receptor 4), MyD88 (Myeloid differentiation primary response gene 88), TRAF6 (TNF receptor associated factor 6), TRIF (TIR domain containing adapter inducing interferon beta), the transcription factors NFkB (Nuclear factor kappa B), IRF7 (Interferon regulatory factor 7) and IFN β (Interferon beta). We have also studied inflammatory cytokines such as IL2, IL6, IL8, IL1 β and TNF α to further understand the downstream signalling of TLR4 pathway. These results showed that higher expression of TLR signalling activation via both MyD88-dependent and TRIF-dependent pathways are more beneficial to chicken mononuclear cells mediated innate immunity. We observed TRIF dependent pathway in Aseel and Ghagus breeds. Our results are in concurrent with general observation that Aseel breed is comparatively more resistant, Ghagus and broilers are moderately resistant and Dahlem Red is comparatively more susceptible to bacterial infections.

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Abbreviations

TLR4:

(Toll-like receptor 4)

MyD88:

(Myeloid differentiation primary response gene 88)

TRAF6:

(TNF receptor associated factor 6)

TRIF:

(TIR domain containing adapter inducing interferon beta)

NFkB:

(Nuclear factor kappa B)

IRF7:

(Interferon regulatory factor 7)

IFN β:

(Interferon beta)

IL 2:

(Interleukin 2)

IL 6:

(Interleukin 6)

IL 8:

(Interleukin 8)

IL 1β:

(Interleukin 1 beta)

TNF α:

(Tumor Necrosis Factor alpha)

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Acknowledgments

This work was supported by DBT-NIAB grant of Government of India. We appreciate the funding in form of CSIR and UGC Fellowships from Government of India.

Disclosure of conflicts of interest

The authors declare no conflicts of interest.

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Authors and Affiliations

  1. Department of Biochemistry,F-56, School of Life Sciences, University of Hyderabad, (PO) Gachibowli, Hyderabad, 500046, AP, India

    Satya Ratan Pasupuleti, Ravinder Kandi, Ram Babu Undi, Itishri Sahu & Ravi Kumar Gutti

  2. National Institute of Animal Biotechnology (NIAB), D. No. 1-121/1, 4th and 5th Floors, Axis Clinicals Building, Opp. to Talkie Town, Miyapur, Hyderabad, 500049, AP, India

    Hanuma Kumar Karnati & Madhuri Subbiah

  3. Directorate of Poultry Research, Rajendranagar, Hyderabad, 500030, AP, India

    T. R. Kannaki

Authors
  1. Hanuma Kumar Karnati
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  2. Satya Ratan Pasupuleti
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  3. Ravinder Kandi
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  4. Ram Babu Undi
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  6. T. R. Kannaki
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Correspondence to Ravi Kumar Gutti.

Additional information

Hanuma Kumar Karnati and Satya Ratan Pasupuleti contributed equally towards work

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Karnati, H.K., Pasupuleti, S.R., Kandi, R. et al. TLR-4 signalling pathway: MyD88 independent pathway up-regulation in chicken breeds upon LPS treatment. Vet Res Commun 39, 73–78 (2015). https://doi.org/10.1007/s11259-014-9621-2

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  • DOI: https://doi.org/10.1007/s11259-014-9621-2

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