Abstract
The gene mutated in Pendred syndrome (PDS), the PDS gene, is expressed in the inner ear, kidney, and thyroid. It encodes a membrane protein named pendrin that is endowed with the function of anion transporter or exchanger. It has been postulated that in the thyroid pendrin could participate in the transport of iodide from the cell to the lumen of follicles. We generated antipeptide antibodies directed against the C- terminal sequence of human pendrin 1) to characterize the protein expressed in the human thyroid, and 2) to analyze its expression level in relation to the functional activity of thyroid tissue. In denaturing conditions, a single molecular species of 110-115 kDa was identified in human thyroid membrane fractions. After treatment of thyroid membranes with N-glycosidase F, pendrin had an apparent molecular mass of 85 kDa. Analyzed by ultracentrifugation on sucrose gradient in nondenaturing conditions, pendrin sedimented as a main 120- to 140-kDa component. Pendrin was assayed by semiquantitative Western blot in thyroid membrane fractions from 25 hyper- or hypofunctioning tumors and paired normal tissue samples. Pendrin was increased 2-fold in toxic adenomas, was not significantly altered in follicular adenoma, and was...Continue Reading
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