Expression and Correlation of IgG4 and IL-21 in Collagen-Induced Arthritis Rats
Zhen-Yi Long1, Yi-Feng Zhou2, Hao Yuan1
1Department of Clinical Laboratory, Hunan Provincial People's Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, 410005, People's Republic of China.
Journal of Inflammation Research
|October 11, 2021
Summary
Interleukin-21 (IL-21) and immunoglobulin G4 (IgG4) levels increase with rheumatoid arthritis progression in rats. IL-21 may drive disease development by interacting with IL-21 receptors to influence IgG4.
Area of Science:
- Immunology
- Rheumatology
- Molecular Biology
Background:
- Rheumatoid arthritis (RA) is a chronic autoimmune disease characterized by joint inflammation.
- Immunoglobulin G4 (IgG4) and Interleukin-21 (IL-21) are implicated in autoimmune conditions, but their specific roles in RA pathogenesis require further elucidation.
Purpose of the Study:
- To investigate the expression patterns of IgG4 and IL-21 in a rat model of collagen-induced arthritis (CIA).
- To correlate the levels of these molecules with disease severity and joint pathology.
Main Methods:
- Wistar rats were induced with CIA and compared to a control group.
- Serum and ankle joint tissues were analyzed at various time points using ELISA, histological, and immunohistochemical methods.
- Quantification of IgG4, IL-21, and IL-21 receptor (IL-21r) expression was performed.
Main Results:
- Serum levels of IgG4 and IL-21 were significantly elevated in CIA rats and correlated positively with disease progression.
- Expression of IgG4 and IL-21r was markedly higher in the ankle joints of CIA rats compared to controls.
- Elevated protein levels correlated with pathological scores, and serum IL-21 was linked to joint IL-21r levels.
Conclusions:
- IL-21 may play a crucial role in the pathogenesis of RA.
- The interaction between IL-21 and its receptor (IL-21r) might regulate IgG4 levels, thereby promoting RA development.
- Targeting the IL-21/IL-21r pathway could be a potential therapeutic strategy for RA.
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