Background: Thyroid disturbances are common in kidney graft recipients and they may influence graft function. CXC chemokine ligand 10 plays a role in both autoimmune thyroiditis and graft rejection. Thyroid antibody (Ab) positivity has been regarded as a marker of imbalance of the immune system.
Aim: To relate pretransplant positivity for antithyroperoxidase (TPO) Ab and antithyroglobulin (Tg) Ab with kidney graft outcome.
Methods: Pretransplant thyroid antibodies were measured in 211 kidney graft recipients.
Results: The 5-year death-censored graft survival rate was 91.5%. Pretransplant circulating Tg Ab and TPO Ab were detected in 12 (5.7%) and 13 (6.2%) patients, respectively. Lifetime analysis showed similar 5-year graft survival rates in patients negative or positive for Tg Ab and TPO Ab (91.5 vs. 91.7% for Tg Ab and 91.9 vs. 84.6% for TPO Ab). However, patients with pretransplant positivity for TPO Ab showed a significantly lower 5-year graft survival when early graft loss (12 months after transplant) was excluded (84.6 and 96.8% for TPO Ab+ and TPO Ab- patients, respectively; p < 0.05). Occurrence of acute rejection and chronic allograft nephropathy was unrelated to thyroid Ab positivity. Serum CXC chemokine ligand 10 levels were similar independent of Tg Ab and TPO Ab positivity.
Conclusion: Pretransplant positivity for TPO Ab may affect long-term graft survival in kidney graft recipients independent of occurrence of acute rejections and chronic allograft nephropathy.
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