Decreased type 1 iodothyronine deiodinase expression might be an early and discrete event in thyroid cell dedifferentation towards papillary carcinoma

Clinical Endocrinology
Erika L de Souza MeyerA L Maia


Type I iodothyronine deiodinase (D1) catalyses the 5' monodeiodination of T4 and is highly expressed in normal human thyroid gland. We have investigated D1 expression in a series of benign and malignant differentiated thyroid neoplasias. Surgically isolated thyroid tumour fragments were used. D1 expression was determined by reverse transcription polymerase chain reaction (RT-PCR) and enzymatic assay. Tumours and adjacent normal tissues were obtained from 28 unselected patients (papillary carcinoma, n = 14; follicular adenoma, n = 7; follicular carcinoma, n = 6; anaplastic carcinoma, n = 1). D1 mRNA levels were determined using specific primers for the human D1 gene and enzymatic assays were performed using T4 as substrate. In papillary thyroid carcinoma (PTC), D1 mRNA and activity levels were decreased compared with the surrounding tissue (0.25 +/- 0.24 vs. 1.09 +/- 0.54 arbitrary units (AU), P < 0.001 and 0.08 +/- 0.07 vs. 0.24 +/- 0.15 pmol T4/min/mg protein, P = 0.045, respectively). Decreased D1 expression was consistent and was observed in all histological subtypes and clinical stages analysed, including microcarcinomas. By contrast, significantly higher D1 mRNA levels and enzyme activity were present in follicular adenoma...Continue Reading


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Related Concepts

Iodothyronine deiodinase type I
Adenoma, Trabecular
Carcinoma, Papillary
Thyroid Gland Follicular Adenoma
Tumor Markers
Log-Linear Models
Papillary and Follicular Adenocarcinoma
Reverse Transcriptase Polymerase Chain Reaction

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