Dietary amaranths modulate the immune response via balancing Th1/Th2 and Th17/Treg response in collagen-induced arthritis

Abstract

Imbalance between Th1/Th2 and Th17/Treg is crucial in RA progression. Various dietary factors can modulate the disease severity by restoring the balance in differentiation of CD4+ T cell subsets. Dietary amaranths hold an important part of diet as vegetables, where commonly consumed species includes Amaranthus cruentus (Ac), Amaranthus viridis (Av), and Amaranthus hybridus (Ah). The present study focuses on to evaluate whether these dietary amaranths can modulate the immune activation in collagen-induced arthritis. For in vivo study, Female Wistar rats were immunized with type II collagen and after immunization period, rats were separately supplemented with cooked Ac, Av, and Ah at 500 mg/100 g bwt concentration mixed with standard rat feed for 60 days. HPTLC fingerprint analysis identified peaks for compounds in these three amaranths. The results showed a protective role of immunomodulation in Th1/Th2 response of the three dietary amaranths, by significantly augmenting lymphocyte activation with increased IL-4 secretion, but decreased IFN-γ by cultured spleen lymphocytes subjected to collagen-induced inflammation. Moreover, Th17/Treg imbalance created by increase in IL-17 and decrease in IL-10 was significantly balanced by the three dietary supplemented groups. Furthermore, Th1/Th2 status reflected from Tbet/GATA3 ratio and Th17/Treg status reflected from RORγt/FOXP3 ratio was significantly decreased in the three dietary amaranth supplemented groups. Thus, dietary amaranths provide an immune-modulating role by keeping the balance between Th1/Th2 and Th17/Treg response in collagen-induced inflammation.

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Abbreviations

Th1:

T helper 1 cell

Th2:

T helper 2 cell

Th17:

T helper 17 cell

Treg:

T regulatory cell

Tbet:

T box transcription factor

GATA3:

GATA3 binding protein

FOXP3:

Forkhead box P3

RORγt:

Retinoic acid related orphan receptor γt

Con A:

Concanavalin A

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Funding

This study was financially supported by Kerala State Council for Science Technology and Environment (KSCSTE), Thiruvananthapuram, Kerala, India (No. 001/FSHP/12/CSTE).

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JP, VS and HA designed, performed, analyzed the data and wrote the manuscript. AIS and SK contributed significantly to the analysis of the study. LSS and MS contribute to the manuscript preparation.

Corresponding author

Correspondence to A. Helen.

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The authors declare that there is no conflict of interest.

Ethical approval

The animal use protocol was reviewed and approved by Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA) (Registration Number 218/CPCSEA) IAEC-KU-6/2014-15-BC-AH (27) according to the Government of India accepted principles for laboratory animal use and care.

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Peter, J., Sabu, V., Aswathy, I.S. et al. Dietary amaranths modulate the immune response via balancing Th1/Th2 and Th17/Treg response in collagen-induced arthritis. Mol Cell Biochem (2020). https://doi.org/10.1007/s11010-020-03783-x

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Keywords

  • Collagen-induced arthritis
  • Dietary amaranths
  • Th1/Th2
  • Th17/Treg
  • Immunomodulation