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Epidermal growth factor receptors and adenylate cyclase activity in human thyroid tissues

World Journal of Surgery volume 14, pages 410–417 (1990)Cite this article

Abstract

Thyroid stimulating hormone (TSH) and epidermal growth factor (EGF) are growth factors for some thyroid cells in cultures. We have previously found more EGF receptors in neoplastic human thyroid tissues than in normal thyroid tissues. We have also found a higher TSH-stimulated adenylate cyclase (AC) activity in neoplastic human thyroid tissues than in normal thyroid tissues. To clarify the relationship between the effect of EGF and TSH on thyroid tissue, we measured the binding of EGF and TSH and the basal, TSH-stimulated and forskolin-stimulated adenylate cyclase activity in 49 normal, hyperplastic and neoplastic human thyroid tissues (5 normal, 2 Hashimoto thyroiditis, 5 Graves' disease, 14 multinodular goiters, 9 follicular adenomas, S follicular carcinomas, 8 papillary carcinomas, and 1 undifferentiated carcinoma). Specific binding of EGF and TSH were measured by radioreceptor assays using competitive inhibition of radio-labeled ligand by unlabeled ligand. Basal, maximally (300 mU/ml) TSH-stimulated, and maximally (100 mM) forskolin-stimulated adenylate cyclase activities were also measured in the same membrane particulate fractions from the thyroid tissues. We found: neoplastic thyroid tissues bind more labeled EGF than nonneoplastic thyroid tissues; follicular adenomas and carcinomas have higher EGF binding than other thyroid tissues; a weak but significant correlation between specific EGF binding and specific TSH binding, and between specific EGF binding and TSH-stimulated adenylate cyclase activity of the thyroid membrane preparations. These findings are consistent with the hypothesis that TSH stimulates an increase in thyroid EGF receptors by increasing intracellular cAMP. The higher binding of EGF and the higher TSH-stimulated AC activity may explain why thyroid neoplasms grow to a larger size than normal thyroid tissues.

Résumé

La thyroid stimulating hormone (TSH) et l'epidermal growth factor (EGF) sont des facteurs de croissance agissant sur certaines cellules thyroïdes en culture. Nous avons trouvé qu'il y avait plus de récepteurs EGF dans le tissu thyroïde humain néoplasique que dans le tissu thyroïdien normal. Nous avons également montré qu'il y avait plus d'activité d'adenylate cyclase stimulée par la TSH dans le tissu thyroïden néoplasique par rapport au tissu normal. Pour clarifier le rapport entre les effets de l'E.GF et la TSH sur le tissu thyroïden, nous avons mesuré l'activité de liaison d'EGF, de TSH et l'activité adénulate cyclase de base, stimulée par la TSH, et par la forskoline chez 49 patients ayant du tissu normal, hyperplasique ou néoplasique (5 normaux, 2 thyroïdites de Hashimoto, 5 maladies de Basedow, 14 goîtres multinodulaires, 9 adénomes folliculaires, 5 cancers folliculaires, 8 cancers papillaires, et 1 cancer indifférencié). Les liaisons spécifiques d'EGF et de TSH ont été mesurées par le dosage des récepteurs nucléaires par la méthode de déplacement des ligands marqués par des ligands froids (non marquées). Les activités adénylate cyclase de base, maximale (300 mU/mL), stimulée par la TSH (300 mU/mL) et la forskoline (100 mM) ont été également mesurées dans les mêmes fractions de particules membranaires provenant des tissus thyroïdens. Nous avons trouvé que: les tissus néoplasiques se liaient davantage avec l'EGF que les tissus non néoplasiques; les adénomes folliculaires et les cancers avaient un index de liaison plus élevé que les autres tissus thyroïdens; et il y avait une corrélation faible mais significative entre la liaison spécifique EGF et TSH, et entre la liaison spécifique EGF et l'activité adénylate cyclase des préparations de membrane thyroïdienne. Ces résultats sont en faveur de l'hypothèse selon laquelle la TSH provoque une augmentation des récepteurs EGH de la thyroïde en augmentant la concentration intracellulaire d'AMP cyclique. Le degré de liaison d'EGF élevé, et l'augmentation de l'activité stimulée par la TSH peuvent expliquer la croissance accélérée des tissus néoplasiques par rapport à celle des tissus normaux.

Resumen

La hormona estimuladora de tiroides (TSH) y el factor de crecimiento epidermal (EGF) son factores de crecimiento para algunas células tiroideas en cultivo tisular. Previamente hemos informado el hallazgo de más receptores de EGF en tejidos tiroideos neoplásicos humanos que en tejidos tiroideos normales. Con el objeto de clarificar la relación entre el efecto del EGF y de la TSH sobre el tejido tiroideo, realizamos la determinacion de la ligación del EGF y de la TSH y de la actividad basai y de la actividad estimulada por TSH y forskolina de la adenilato-ciclasa (AC) en 49 especímenes de tejido tiroideo humano (5 normales, 2 tiroiditis de Hashimoto, 5 enfermedad de Graves, 14 bocios multinodulares, 9 adenomas foliculares, 5 carcinomas foliculares, 8 carcinomas papilares, y 1 carcinoma indiferenciado). La ligadura especifica del EGF y de la TSH fue medida mediante determinaciones de receptores utilizando inhibición competitiva radiomarcada. También se determinó la actividad basai y la actividad estimulada por forskolina de la adenilato-ciclasa en las mismas fracciones de tejidos tiroideos. Se registraron los siguientes hallazgos: los tejidos neoplásicos ligan más EGF marcado que los tejidos tiroideos no neoplásicos; los adenomas foliculares y los carcinomas poseen una capacidad de ligación del EGF mayor que los otros tejidos tiroideos; hay una débil pero significativa correlación entre la ligación especifíca del TGF y la de la TSH, y entre la ligación específica del EGF y la actividad estimulada por TSH de la adenilato-ciclasa en las preparaciones de membrana tiroidea. Estos hallazgos aparecen consistentes con la hipótesis de que la TSH estimula un aumento en los receptores de EGF mediante el incremento de la cAMP intracelular. La aumentada ligación de EGF y la incrementada actividad estimulada de TSH pueden explicar el por qué los neoplasmas tiroideos crecen hasta un tamaño mayor que los tejidos tiroideos normales.

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Affiliations

  1. Veterans Administration Medical Center, Surgical Service, mail route 112, 4150 Clement Street, 94121, San Francisco, California, USA

    Quan-Yang Duh M.D., Allan E. Siperstein M.D., Rebecca A. Miller B.A., Joan J. Sancho M.D., Michael J. Demeure M.D. & Orlo H. Clark M.D.

  2. Department of Surgery, University of California, San Francisco, California, USA

    Quan-Yang Duh M.D., Allan E. Siperstein M.D., Rebecca A. Miller B.A., Joan J. Sancho M.D., Michael J. Demeure M.D. & Orlo H. Clark M.D.

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  1. Quan-Yang Duh M.D.
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  2. Allan E. Siperstein M.D.
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Supported in part by the Medical Research Service of the Veterans Administration Medical Center, San Francisco, California and the Affirmative Action Faculty Development Grant of the University of California, San Francisco, California.

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Duh, QY., Siperstein, A.E., Miller, R.A. et al. Epidermal growth factor receptors and adenylate cyclase activity in human thyroid tissues. World J. Surg. 14, 410–417 (1990). https://doi.org/10.1007/BF01658542

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Keywords

  • Epidermal Growth Factor Receptor
  • Epidermal Growth Factor
  • Thyroid Stimulate Hormone
  • Thyroid Tissue
  • Multinodular Goiter