Association between interleukin 21 and Graves' disease

Area of Science:

• Immunology
• Genetics
• Endocrinology

Background:

• Graves' disease (GD) is an autoimmune thyroid disorder affecting 25-50% of patients with Graves' ophthalmopathy (GO).
• The immune system, particularly cytokines like IL-21, plays a key role in the multifactorial etiology of GD and GO.

Purpose of the Study:

• To investigate the association between Interleukin-21 (IL-21) and the development of Graves' disease (GD) and Graves' ophthalmopathy (GO).
• To examine both serum IL-21 levels and IL-21 gene polymorphisms in relation to GD and GO.

Main Methods:

• Serum IL-21 concentrations were measured in 40 GD patients, 42 GO patients, and 24 healthy controls.
• A case-control association study analyzed IL-21 gene polymorphisms (rs4833837, rs907715, rs13143866) in 633 GD patients and 612 healthy controls from the Chinese population.

Main Results:

• Elevated serum IL-21 levels were associated with the development of GD.
• The rs907715 single nucleotide polymorphism (SNP) showed a significant association with GD.
• The rs13143866 A allele was significantly associated with GO, and the A-G-G haplotype was more frequent in GD patients, suggesting a protective role for the A-A-A haplotype.

Conclusions:

• Interleukin-21 (IL-21) is implicated in the pathogenesis of Graves' disease (GD) and Graves' ophthalmopathy (GO).
• Specific IL-21 gene polymorphisms are associated with GD and GO, highlighting potential genetic risk factors.