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CD5+ B cells in Graves' disease: correlation with disease activity
J J Corrales1, A Orfao, A López
1Servicio de Endocrinología, Universidad de Salamanca, Spain.
Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|June 1, 1996
Summary
Graves' disease patients show increased CD5+ B cells, linked to thyroid hormones and cytokines IL-2/IL-6. These cells, while not directly producing anti-TSH receptor antibodies, are regulated by thyroid hormone levels.
Area of Science:
- Immunology
- Endocrinology
Background:
- Graves' disease (GD) is an autoimmune disorder affecting the thyroid.
- The role of specific B-lymphocyte subsets in GD pathogenesis is not fully understood.
Purpose of the Study:
- To analyze the distribution of CD5+B and CD5-B lymphocytes in Graves' disease patients.
- To correlate these cell populations with disease activity, cytokine binding, and autoantibody levels.
Main Methods:
- Flow cytometry and 3-color immunofluorescence were used to quantify peripheral blood B-lymphocyte subsets.
- Analysis included correlation with disease markers such as anti-TSH receptor antibodies and thyroid hormone levels.
Main Results:
- A significant increase in CD5+ B cells was observed in untreated hyperthyroid GD patients, normalizing with methimazole treatment.
- Elevated CD5+ B cell numbers persisted in long-term remission and correlated with higher free thyroxine and total triiodothyronine levels.
- Absolute CD5+ B cell counts strongly correlated with B cell binding of interleukin-2 (IL-2) and interleukin-6 (IL-6).
Conclusions:
- CD5+ B cells in Graves' disease are influenced by thyroid hormone levels and cytokine interactions (IL-2, IL-6).
- These cells do not appear to be directly involved in the production of anti-TSH receptor antibodies in GD.