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Tannic acid prevents macrophage-induced pro-fibrotic response in lung epithelial cells via suppressing TLR4-mediated macrophage polarization

  • Ayyanar Sivanantham
  • Dhamotharan Pattarayan
  • Nandhine Rajasekar
  • Adithi Kannan
  • Lakshmanan Loganathan
  • Ramalingam Bethunaickan
  • Santanu Kar Mahapatra
  • Rajaguru Palanichamy
  • Karthikeyan Muthusamy
  • Subbiah RajasekaranEmail author
Original Research Paper
  • 50 Downloads

Abstract

Background

Polarized macrophages induce fibrosis through multiple mechanisms, including a process termed epithelial-to-mesenchymal transition (EMT). Mesenchymal cells contribute to the excessive accumulation of fibrous connective tissues, leading to organ failure. This study was aimed to investigate the effect of tannic acid (TA), a natural dietary polyphenol on M1 macrophage-induced EMT and its underlying mechanisms.

Materials

First, we induced M1 polarization in macrophage cell lines (RAW 264.7 and THP-1). Then, the conditioned-medium (CM) from these polarized macrophages was used to induce EMT in the human adenocarcinomic alveolar epithelial (A549) cells. We also analysed the role of TA on macrophage polarization.

Results

We found that TA pre-treated CM did not induce EMT in epithelial cells. Further, TA pre-treated CM showed diminished activation of MAPK in epithelial cells. Subsequently, TA was shown to inhibit LPS-induced M1 polarization in macrophages by directly targeting toll-like receptor 4 (TLR4), thereby repressing LPS binding to TLR4/MD2 complex and subsequent signal transduction.

Conclusion

It was concluded that TA prevented M1 macrophage-induced EMT by suppressing the macrophage polarization possibly through inhibiting the formation of LPS-TLR4/MD2 complex and blockage of subsequent downstream signal activation. Further, our findings may provide beneficial information to develop new therapeutic strategies against chronic inflammatory diseases.

Keywords

EMT LPS M1 macrophages Mesenchymal cells Tannic acid TLR4 

Notes

Acknowledgements

This work was supported by Ramalingaswami re-entry fellowship (BT/RLF/Re-entry/36/2013). S. R. is the recipient of Ramalingaswami re-entry fellowship from the Department of Biotechnology (DBT), Government of India. This study was also supported in part by the Department of Science and Technology (DST; Award No: YSS/2014/000125) (to S. R.), Government of India. The first author (A. S.) gratefully acknowledges the support of Indian Council of Medical Research (ICMR), New Delhi, India for the award of ICMR‐Senior Research Fellowship (SRF; Award No: 45/03/2018‐BMS/PHA/OL). The infrastructure of Department of Biotechnology, Anna University, BIT-campus is supported by the Department of Science and Technology-Fund for Improvement of S and T Infrastructure in Universities and Higher Educational Institutions (DST-FIST).

Author contributions

SR has conceptualized, designed the experiments, acquired financial support, supervised the study, and wrote the manuscript; AS performed most of the experiments; DP and NR involved in the acquisition of data; AS, DP and SR analysed data and interpreted the results; AK and SKM participated in cytokine analysis; LL and KM participated in computational analysis; RB participated in flow cytometry analysis; RB, SKM and RP contributed reagents/materials/analysis tools.

Compliance with ethical standards

Conflict of interest

The authors report no conflict of interest.

Supplementary material

11_2019_1282_MOESM1_ESM.pdf (108 kb)
Supplementary material 1 (PDF 108 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Ayyanar Sivanantham
    • 1
  • Dhamotharan Pattarayan
    • 1
  • Nandhine Rajasekar
    • 1
  • Adithi Kannan
    • 2
  • Lakshmanan Loganathan
    • 3
  • Ramalingam Bethunaickan
    • 4
  • Santanu Kar Mahapatra
    • 2
  • Rajaguru Palanichamy
    • 1
  • Karthikeyan Muthusamy
    • 3
  • Subbiah Rajasekaran
    • 1
    • 5
    Email author
  1. 1.Department of Biotechnology, BIT-CampusAnna UniversityTiruchirappalliIndia
  2. 2.Centre for Research in Infectious Diseases (CRID), School of Chemical and BiotechnologySASTRA Deemed To Be UniversityThanjavurIndia
  3. 3.Pharmacogenomics and CADD Lab, Department of BioinformaticsAlagappa UniversityKaraikudiIndia
  4. 4.Department of ImmunologyICMR-National Institute for Research in TuberculosisChennaiIndia
  5. 5.Department of Biochemistry, ICMR-National Institute for Research in Environmental Health, Kamla Nehru Hospital BuildingGandhi Medical College CampusBhopalIndia

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