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Human thyroid tissue do not express thyroalbumin

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Abstract

Thyroid tissue total RNAs from multinodular goiter(G2) and from hereditary goiter with defective Tg synthesis (JNA) were hybridized with a 5’albumin cDNA probe (F-47), a 3’ albumin cDNA probe (B-44) and a thyroglobulin cDNA probe (phTgM3). JNA refers to tissue obtained from a patient with virtual absence of Tg in thyroid tissue and the presence of increased concentration of an albumin-like labeled protein in the thyroid. No hybridization signal was detected in both G2 and JNA with albumin probes at Northern Blot studies. Those results were confirmed by dot-blot analysis of total RNA where no hybridization signal was detected in G2 and JNA. To confirm that thyroid tissues do not express thyroalbumin total RNA from JNA and normal control thyroid tissue (C) were amplified by PCR using albumin and Tg primers. An expected fragment of 592 bp was observed in a human liver sample with the albumin primers. However JNA and C samples showed absence of an amplification product of the same size. We concluded that thyroid cells do not contain the albumin transcript. Albumin is probably taken up from circulation and iodinated by the thyroid follicular cell with subsequent release of iodoalbumin into the circulation.

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Abbreviations

PCR:

polymerase chain reaction

nt:

nucleotide

bp:

base pairs

dNTP:

deoxyribonucleotide triphosphate

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Targovnik, H.M., Frechtel, G.D., Varela, V. et al. Human thyroid tissue do not express thyroalbumin. J Endocrinol Invest 16, 415–419 (1993). https://doi.org/10.1007/BF03348869

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  • DOI: https://doi.org/10.1007/BF03348869

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