The Study
Interplay between expression of PD-L1 on thyrocytes and intrathyroidal lymphocytes and FOXP3 as a marker of regulatory T lymphocytes in Hashimoto thyroiditis.
This study looked at thyroid tissue from people who already had Hashimoto's and compared it to tissue from people who didn't. It found that certain immune cells and proteins were more common in the sick tissue, but it doesn't prove those cells caused the sickness—they might just be reacting to it.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
In Hashimoto's, the body's immune soldiers (T cells and B cells) invade the thyroid and try to destroy it. But there are also peacekeepers (FOXP3+ Tregs) trying to calm them down—but they're worn out from fighting too long.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 542 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes—this suggests the thyroid is trying to protect itself by sending 'stop' signals, but the immune attack is too strong and chronic, leading to gradual destruction and hypothyroidism.
- 2100% of Hashimoto thyroid tissue had FOXP3+ peacekeepers; only 8.3% of healthy tissue did.
- 3PD-L1 (a 'stop' signal) was on the surface AND inside thyroid cells in Hashimoto, but only inside in healthy tissue.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
American journal of physiology. Endocrinology and metabolism
Year
2025
Authors
Ana Carolina Barros Silva, I. Damas, C. Moma, I. Barreto, D. Zantut-Wittmann
Related Content
Claims (10)
In Hashimoto's disease, the immune system attacks the thyroid gland, leading to its gradual damage and reduced production of thyroid hormones.
In people with Hashimoto thyroiditis, thyroid cells display PD-L1 protein on their surface and inside the cell, whereas in people without autoimmune thyroid disease, PD-L1 is found mainly inside the cell and not on the surface.
In Hashimoto thyroiditis, thyroid cells and immune cells show higher levels of PD-L1 protein, which directly reduces the immune system's attack on the thyroid.
In Hashimoto thyroiditis, PD-L1 protein is present on thyroid cells and nearby immune cells, and this interaction reduces immune system activity against the thyroid.
In Hashimoto thyroiditis, thyroid cells display PD-L1 protein on their surface and inside the cell, whereas in healthy thyroid tissue, PD-L1 is found only inside the cell.
In people with Hashimoto thyroiditis, thyroid tissue contains a much higher proportion of FOXP3+ regulatory T cells than thyroid tissue from people without autoimmune disease, while CD25+ expression levels are similar, suggesting a unique subset of regulatory T cells is present in the inflamed thyroid.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.