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This study aimed to identify the beneficial effects of adipose tissue-derived mesenchymal stem cells (ASCs) and ASCs that overexpress the CTLA4Ig gene (CTLA4Ig-ASCs) on established autoimmune thyroiditis and to examine changes in clinical chemistry parameters and the presence of humoral responses upon repeated long-term administration of autologous ASCs. This study also aimed to acquire desirable results in a preclinical study by using large-sized lab animals and applying ASCs that overexpress therapeutic genes. Experimental autoimmune thyroiditis was induced by immunization with thyroglobulin. Experimental dogs were divided into five groups: (i) ASC IT + IV, (ii) ASC IV, (iii) CTLA4Ig-ASC IT + IV, (iv) CTLA4Ig-ASC IV, and (v) control IT + IV (saline only), and they received intrathyroidal (IT; 10 million cells/250 μl saline per thyroid) administration one time or intravenous (IV; 20 million cells/5 ml) administration seven times within a 101-day period. Blood samples were collected every week, and thyroids were harvested on days 104-106. After serial ASC or CTLA4Ig transplantation, the levels of canine thyroglobulin autoantibodies (TgAA) in serum and the infiltration of T-lymphocytes between the follicles of the thyroid glands were decreased. The expression of FoxP3 in submandibular lymph nodes was significantly increased. Repeated long-term administration of autologous ASCs or CTLA4Ig-ASCs did not generate changes in clinical chemistry parameters or humoral responses. The TgAA test can detect autoimmune thyroiditis years before clinical signs of hypothyroidism occur. Thus, ASC and CTLA4Ig-ASC transplantation in that period can be attractive candidates to ameliorate autoimmune thyroiditis and prevent the development of hypothyroidism.

cell transplantation

Therapeutic Effects of <i>CTLA4Ig</i> Gene-Transduced Adipose Tissue-Derived Mesenchymal Stem Cell Transplantation on Established Autoimmune Thyroiditis

Therapeutic Effects of CTLA4Ig Gene-Transduced Adipose Tissue-Derived Mesenchymal Stem Cell Transplantation on Established Autoimmune Thyroiditis