Assessment of autoantibodies associated with intravenous immunoglobulin replacement therapy in children with primary immunodeficiency

• Published in: Scandinavian journal of immunology Vol. 100; no. 5; pp. e13396 - n/a
• Main Authors: Özer, Murat, Tekeli, Seher, Doğan, Selçuk, Çetin, Sema, Selen, Rıdvan, Aytekin, Caner
• Format: Journal Article
• Language: English
• Published: England Wiley Subscription Services, Inc 01.11.2024
• Subjects: Adolescent; Autoantibodies; Autoantibodies - blood; Autoantibodies - immunology; Autoimmune diseases; autoimmunity; Celiac disease; Child; Child, Preschool; Female; Hashimoto's thyroiditis; Humans; IgRT; Immune system; Immunization, Passive - methods; Immunodeficiency; Immunoglobulins; Immunoglobulins, Intravenous - therapeutic use; Immunologic Deficiency Syndromes - immunology; Immunologic Deficiency Syndromes - therapy; Infant; Male; Medical records; Medical treatment; Patients; Pediatrics; Primary immunodeficiencies; primary immunodeficiency; Primary Immunodeficiency Diseases - diagnosis; Primary Immunodeficiency Diseases - immunology; Primary Immunodeficiency Diseases - therapy; Retrospective Studies; Thyroiditis; autoimmunity; primary immunodeficiency; IgRT
• ISSN: 0300-9475; 1365-3083; 1365-3083
• DOI: 10.1111/sji.13396

While it is known that immunoglobulin replacement therapy (IgRT) used in the treatment of primary immunodeficiency disorders (PIDs) can lead to the passive transfer of autoantibodies, there is no data indicating that these antibodies can cause clinical symptoms in patients. This study aimed to investigate the presence of autoantibodies and their clinical correlation in patients diagnosed with PIDs receiving IgRT. Paediatric patients who were diagnosed with PIDs, and administered IgRT at our immunology clinic between 1 January 2012 and 31 December 2021, were included in the study. The medical records of these patients were retrospectively analysed, and autoantibodies were screened. Autoantibody screening was conducted at least once in 48 cases. Among these cases, 29 cases (60.4%) demonstrated positivity for at least one of the autoantibodies screened in the study. Among these cases, 23 tested positive for anti‐TPO, 9 for anti‐TG and 2 for both anti‐TPO and anti‐TG. Only two of these patients were confirmed to have Hashimoto's thyroiditis. In 30 cases, autoantibodies related to Celiac disease (CD) were screened, with at least one being positive in five different cases; CD was not confirmed. The results of our study suggest that passive transfer of autoantibodies to patients with IgRT does not cause any significant clinical findings. In addition, in cases of PID, autoantibodies detected in the blood passed to patients with IgRT can lead to misdiagnosis. Screening for autoantibodies in patients with PID undergoing IgRT may not yield accurate results in terms of detecting autoimmune diseases. After more than 10 years of research, our data show that autoantibodies are transferred to the patient with IgRT but do not cause autoimmune disease. Another important point of our study was that IgRT‐induced autoantibody positivity in the blood may lead to misdiagnosis and treatment.