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Thyroid peroxidase autoantibody fingerprints. II. A longitudinal study in postpartum thyroiditis
J C Jaume1, A B Parkes, J H Lazarus
1Thyroid Molecular Biology Unit, Veterans Administration Medical Center, San Francisco, California 94121.
The Journal of Clinical Endocrinology and Metabolism
|March 1, 1995
Summary
Autoantibody epitope fingerprints for thyroid peroxidase (TPO) remained stable in women postpartum, even with changing antibody levels. This suggests TPO autoantibody profiles may be inherited and B cell epitopes do not spread during immune perturbation.
Area of Science:
- Immunology
- Autoimmunity
- Molecular Biology
Background:
- The stability of autoantibody recognition sites (epitopes) over time, particularly during immune system changes like the postpartum period, is not well understood.
- Autoantibodies targeting thyroid peroxidase (TPO) are common in autoimmune thyroid disease.
Purpose of the Study:
- To investigate whether the epitopic profile (fingerprint) of autoantibodies against TPO changes in women during the postpartum period.
- To determine if fluctuations in serum TPO autoantibody levels affect the stability of their recognized epitopes.
Main Methods:
- Studied the epitopic profiles of TPO autoantibodies in 19 women during the postpartum period using competition assays with recombinant F(ab) fragments.
- Collected serum samples at delivery and at three intervals over 9-12 months postpartum.
- Defined TPO immunodominant regions (A1, A2, B1, B2 domains) using F(ab) inhibition.
Main Results:
- The TPO autoantibody epitopic fingerprints were relatively unchanged in all 19 women throughout the 9-12 month postpartum study period.
- Fingerprint constancy was observed irrespective of significant fluctuations in serum TPO autoantibody levels.
- Individual women maintained consistent ratios of A/B domain epitope recognition over time, despite inter-individual variations in overall epitopic profiles.
Conclusions:
- The study demonstrates a remarkable lack of B cell epitope spreading in TPO autoantibodies during immune perturbation over one year.
- The constancy of TPO autoantibody epitopic fingerprints over time, despite individual variations, suggests these profiles may be genetically determined or inherited.