IgG-class insulin autoantibodies in autoimmune thyroid disease

Area of Science:

• Endocrinology
• Immunology
• Autoimmune Diseases

Background:

• Autoimmune thyroid disease (AITD) is common.
• Insulin autoantibodies (IAA) are markers of autoimmune diabetes.
• The co-occurrence of AITD and autoimmune diabetes is of clinical interest.

Purpose of the Study:

• To investigate the prevalence of insulin autoantibodies (IAA) in patients with autoimmune thyroid disease (AITD).
• To determine if IAA presence is associated with other autoimmune markers like thyrotropin receptor antibodies (TRAb) or islet cell antibodies (ICA).

Main Methods:

• Enzyme-linked immunosorbent assay (ELISA) was used to detect IAA and ICA.
• Thyrotropin receptor antibodies (TRAb) were also measured.
• Study included 97 patients with AITD and a retrospective cohort of 12 patients on antithyroid drugs.

Main Results:

• Insulin autoantibodies (IAA) were detected in 7.2% of patients with AITD.
• No patients tested positive for islet cell antibodies (ICA).
• The presence of IAA was not statistically associated with TRAb levels or status.

Conclusions:

• A small but significant proportion of AITD patients possess IAA.
• The findings suggest that IAA in AITD patients may not be linked to the same autoimmune pathways as TRAb.
• Further research is warranted to understand the clinical significance of IAA in AITD.