Dexamethasone differentially inhibits thyroxine- or growth hormone-induced body and organ growth of Snell dwarf mice.
Endocrinology
; 144(6): 2553-8, 2003 Jun.
Article
en En
| MEDLINE
| ID: mdl-12746318
Supraphysiological doses of glucocorticoids cause growth retardation in both animals and humans. Many studies have addressed the interaction of glucocorticoids with the GH/IGF system, but little is known about the effect of glucocorticoids on T(4)-stimulated growth. The Snell dwarf mouse is deficient in GH, thyroid-stimulating hormone, and prolactin and therefore allows the study of the effect of glucocorticoids on the growth induced by GH and T(4) without their mutual interaction. Four weeks of treatment with T(4) (1 micro g/d) or human GH (50 mU/d) equally increased nose-tail length (3.1 +/- 0.1 cm and 3.0 +/- 0.2 cm, respectively). Dexamethasone (DXM) had much less impact on T(4)-stimulated growth than on GH-induced growth (T(4) + DXM: 2.4 +/- 0.1 cm vs. GH+ DXM: 1.4 +/- 0.1 cm). Similar data were obtained for body weight gain. T4 and GH had a different effect on the weight of various organs: GH caused a higher increase in liver and lumbar vertebrae weight, and T(4) was a better stimulator for kidney (P < 0.05), thymus, and spleen growth. Remarkably, T(4)-stimulated growth of the organs was less affected by DXM than GH-induced organ growth. GH even potentiated the growth inhibition by DXM in the thymus and tibia. In conclusion, T(4)-stimulated growth in Snell dwarf mice is less affected by DXM than growth stimulated by GH
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Tiroxina
/
Dexametasona
/
Hormona del Crecimiento
/
Enanismo
/
Glucocorticoides
Límite:
Animals
Idioma:
En
Revista:
Endocrinology
Año:
2003
Tipo del documento:
Article
País de afiliación:
Países Bajos
Pais de publicación:
Estados Unidos