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  • Open Access

Impaired NK and NKT cells immunobiology in rheumatoid arthritis

  • 1,
  • 2 and
  • 1
Journal of Translational Medicine201210(Suppl 3):P32

https://doi.org/10.1186/1479-5876-10-S3-P32

Published: 28 November 2012

Keywords

  • Oxidative Stress
  • Rheumatoid Arthritis
  • Rheumatoid Arthritis Patient
  • Mitochondrial Membrane Potential
  • Cell Subset

Introduction

Rheumatoid Arthritis (RA) is an autoimmune disease with uncertain pathophysiology involving many interwoven signalling cascades. ROS, NK and NKT cells might be crucial in the disease severity of RA.

However, the role of oxidative stress, its impact on NK and NKT cell immunobiology and disease activity (DAS28) is largely unknown.

Aim

In this study, we assessed the role of oxidative stress and NK cell subsets in the disease pathogenesis of RA.

Patients and methods

The study included 30 patients of RA attending the out-patient Dept. of Internal medicine, PGIMER Chandigarh. An equal number of age and sex matched healthy volunteers were included. The state of oxidative stress in various peripheral blood fractions, percentage NK and NKT cell expression, their altered apoptotic signaling pathways involving mitochondrial membrane potential, FAS associated death domain (FADD) mediated pathways and DNA damage were studied.

Results

Results explained a state of profound oxidative stress in the peripheral blood of RA patients. The percentage NK and NKT cell subsets were found to be diminished while ROS levels were increased. The depolarized mitochondrial membrane potential, FAS, FASL and active caspase-3 positive NK and NKT cell subsets were much elevated in patients. The DNA damage, assessed as percentage of DNA in comet tail, was significantly elevated.

Conclusions

The present study strongly supports the protective role of NK cell subsets in the pathogenesis of RA. Findings of the present work indicate increased cellular apoptosis of peripheral NK and NKT cells in the diseased condition. PBMC and RBC are the major sites of enhanced oxidative stress. The state of oxidative stress and altered immunobiology of NK and NKT cells were strongly correlated with DAS28 score.

Declarations

Acknowledgement

The present study was supported by the grant of Council of Scientific and Industrial Research (CSIR), India.

Authors’ Affiliations

(1)
Dept. of Biochemistry, Panjab University, Chandigarh, India
(2)
Dept. of Internal Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India

Copyright

© Aggarwal et al; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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