Abstract
Expression of thyrotropin receptor (TSHr) was analyzed in normal human thyroids and differentiated thyroid tumours by Northern blotting of total RNA and by Western blotting of detergent-solubilized membrane proteins with an antibody specific for the extracellular domain of TSHr. Under nonreducing conditions TSHr stained as a 90-kDa protein in normal thyroid tissue. Expression varied in differentiated carcinomas from normal to not detectable in parallel to steady state TSHr mRNA levels and TSH binding in a TSH binding assay. The negative expression of TSHr in some patients with differentiated carcinomas may have consequences for the TSH suppressive treatments of these patients.
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