TSH induces insulin receptors that mediate insulin costimulation of growth in normal human thyroid cells.
Biochem Biophys Res Commun
; 279(1): 202-7, 2000 Dec 09.
Article
en En
| MEDLINE
| ID: mdl-11112439
The mitogenic/goitrogenic effects of thyrotropin (TSH) on human thyrocytes in vitro and in vivo depend on permissive comitogenic effects of insulin-like growth factors (IGFs), which are mimicked in vitro by the low-affinity binding of high supraphysiological concentrations of insulin to IGF-I receptors. Contrary to general assumption, we show here that very low concentrations of insulin, acting through insulin receptors but not IGF-I receptors, can also support the stimulation of DNA synthesis by TSH in primary cultures of normal human thyrocytes. Moreover, TSH through cAMP increases the content of insulin receptors demonstrated by Western blotting and the cells' responsiveness to low insulin concentrations. These observations provide the first in vitro evidence in normal human thyroid cells of a functional interaction between TSH and insulin acting through its own receptor.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Glándula Tiroides
/
Receptor de Insulina
/
Tirotropina
/
División Celular
/
Insulina
Límite:
Humans
Idioma:
En
Revista:
Biochem Biophys Res Commun
Año:
2000
Tipo del documento:
Article
País de afiliación:
Bélgica
Pais de publicación:
Estados Unidos