Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:1.6.3.1 (NADPH oxidase)
 11,281 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Hypothyroidism, together with glandular atrophy, is the usual outcome of destructive autoimmune thyroiditis. The impairment in the thyroid function results either from cell destruction or from Th1 cytokine-induced alteration in hormonogenesis. Here, we investigated the impact of the local immune context on the thyroid function. We used two rat thyroid cell lines (PCCL3 and FRTL-5) and human thyrocytes incubated with IL-1alpha/interferon (IFN) gamma together with IL-4, a Th2 cytokine, or with TGF-beta, or IL-10, two Th3 cytokines. We first observed that IL-4 totally blocked IL-1alpha/interferon gamma-induced alteration in dual oxidase and thyroperoxidase expression, and in thyroglobulin secretion. By contrast, TGF-beta and IL-10 had no such effect. They rather repressed thyrocyte function as do Th1 cytokines. In addition, IL-4 blocked IL-10-induced repression of thyrocyte function, but not that induced by TGF-beta. In conclusion, Th1 cytokine- and IL-10-induced local inhibitory actions on thyroid function can be totally overturned by Th2 cytokines. These data provide new clues about the influence of the immune context on thyrocyte function.
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PMID:Differential interactions between Th1/Th2, Th1/Th3, and Th2/Th3 cytokines in the regulation of thyroperoxidase and dual oxidase expression, and of thyroglobulin secretion in thyrocytes in vitro. 1818 47

Autoimmune thyroiditis, also known as chronic lymphocytic or Hashimoto's thyroiditis, is characterized by infiltration of the thyroid gland by inflammatory cells and production of autoantibodies to thyroid-specific antigens thyroglobulin and thyroperoxidase. It is accompanied by hypothyroidism due to destruction and eventual fibrous replacement of the follicle cells. Autoimmune thyroiditis is clearly multifactorial in etiology with genetic and environmental factors contributions. Excess dietary Iodine can exacerbate thyroiditis in genetically susceptible hosts such as the NOD.H2(h4) mouse. In this mouse excess dietary iodine leads to an increased immunogenicity of the thyroglobulin molecule and enhanced expression of ICAM-1 on thyroidal follicle cells. We present evidence here that ICAM-1 expression is enhanced by the elevated generation of reactive oxygen species (ROS). The anti-oxidant diphenyleneiodium (DPI), an inhibitor of NADPH oxidase, reduced both the generation of ROS and of ICAM-1 expression in cultures of NOD.H2(h4) mouse thyrocytes. These results suggest that antioxidants may have therapeutic value in preventing autoimmune thyroiditis.
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PMID:Autoimmune thyroiditis and ROS. 1862 41