Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/48089
Título: Thyroid hormone regulation of rat hepatocyte proliferation and polyploidization
Autores/as: Torres, Santiago
Díaz, Blanca P.
Cabrera, Juan J. 
Diaz-Chico, JC 
Díaz-Chico, Bonifacio N. 
López-Guerra, Antonio 
Palabras clave: Glucocorticoid-Binding-Sites
Liver-Regeneration
Growth-Hormone
In-Vivo
Cell-Proliferation, et al.
Fecha de publicación: 1999
Publicación seriada: American Journal of Physiology - Gastrointestinal and Liver Physiology 
Conferencia: 79th Annual Meeting of the Endocrine-Society 
Resumen: The liver of adult mammals contains various classes of polyploid hepatocytes produced by a process that is partially regulated by hormones. However, it is not well understood how the hormones affect the rate of hepatocyte proliferation under physiological conditions. Here we have studied the specific roles of 3,5,3'-triiodothyronine (T-3), growth hormone (GH), and sex steroids on the percentage of diploid nuclei in S phase and on the population of liver tetraploid (4C) cell nuclei in several rat model systems. Gonadal steroids had no effect on the 8 phase but account for gender differences in the 4C nuclei. Hypophysectomy in adult male rats produced a moderate decrease in 4C nuclei that was reversed by treatment with 25 mu g T-3.kg(-1).day(-1), whereas treatment with 200 mu g human recombinant GH (hGH).kg(-1).day(-1) was ineffective. Rats made hypothyroid by methimazole treatment of dams and pups until death showed a low 8 phase and only 5% of 4C nuclei at 70 days of age. T-3 significantly increased the 8 phase 24 h after administration and restored the adult normal level of 4C nuclei after 10 days of treatment. hGH did not affect the 4C nuclei or the S phase in the hypothyroid rats. These results suggest that the processes of hepatocyte proliferation and polyploidization of the rat liver are under endocrine control, with thyroid hormones playing the essential regulatory role.
URI: http://hdl.handle.net/10553/48089
ISSN: 0193-1857
Fuente: American Journal Of Physiology-Gastrointestinal And Liver Physiology[ISSN 0193-1857],v. 276 (1), p. G155-G163
Colección:Artículos
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