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| Freitas,E. S.; Leite,E. D.; Silva,A. E.; Ocarino,N. M.; Ferreira,E.; Gomes,M. G.; Cassali,G. D.; Serakides,R. |
| The main purpose of this study was to investigate the effect of thyroxine and PTU in ascitic Ehrlich tumor cells. Tumor was implanted in 30 female mice distributed in three groups: treated with PTU, treated with thyroxine and control. Each group received an intraperitoneal injection of neoplastic cells, pre-incubated with sterile solutions of PTU, thyroxine and distilled water, respectively. On the fifth and seventh days after inoculation, animals received an intraperitoneal injection of the respective solutions. On the tenth day after inoculation, animals were sacrificed. Volume of ascitic liquid, number of neoplastic cells/ml and percentage of viable cells were determined. Ascitic liquid smears were carried out for tumor cytological evaluation. There was... |
| Tipo: Journal article |
Palavras-chave: Cytology; Ehrlich tumor; Mouse; NORs; Propylthiouracil; Thyroxine. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500024 |
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| Lisbôa,P.C.; Curty,F.H.; Moreira,R.M.; Pazos-Moura,C.C.. |
| There is little information on the possible effects of estrogen on the activity of 5'-deiodinase (5'-ID), an enzyme responsible for the generation of T3, the biologically active thyroid hormone. In the present study, anterior pituitary sonicates or hepatic and thyroid microsomes from ovariectomized (OVX) rats treated or not with estradiol benzoate (EB, 0.7 or 14 µg/100 g body weight, sc, for 10 days) were assayed for type I 5'-ID (5'-ID-I) and type II 5'-ID (5'-ID-II, only in pituitary) activities. The 5'-ID activity was evaluated by the release of 125I from deiodinated 125I rT3, using specific assay conditions for type I or type II. Serum TSH and free T3 and free T4 were measured by radioimmunoassay. OVX alone induced a reduction in pituitary 5'-ID-I... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5'-iodothyronine deiodinase; Ovariectomy; Estradiol; Triiodothyronine; Thyroxine; Thyrotropin. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001200016 |
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| Djelic,Ninoslav; Djelic,Dijana; Spremo-Potparevic,Biljana; Zivkovic,Lada; Markovic,Biljana; Lozance,Olivera; Blagojevic,Milos. |
| Thyroid hormones stimulate aerobic metabolism which may lead to oxidative stress accompanied by damage to various cellular macromolecules, including DNA. Previous comet assay studies have shown that thyroid hormones cause DNA damage due to the creation of reactive oxygen species (ROS). However, cytogenetic studies have been equivocal because although an increase in the sister-chromatid exchange frequency per cell has been reported increased micronuclei frequency has not. We used cytogenetic examination of chromosome breakage and aberrations in whole-blood cultures of human peripheral blood lymphocytes to investigate possible clastogenic effects when lymphocytes were exposed to 0.002 µM to 50 µM of L-thyroxine for 24 h and 48 h, these concentrations being... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Thyroxine; Human lymphocytes; Chromosome aberrations; Mitotic index; ROS. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000600019 |
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