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The effects of soy extract on the uterus of castrated adult rats

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Date
2007-02-20
Author
Mosquette, Rejane
Simoes, Manuel de Jesus
Silva, Ismael Dale Cotrim Guerreiro da [UNIFESP]
Oshima, Celina Tizuko Fujiyama [UNIFESP]
Oliveira-Filho, Ricardo Martins
Haidar, Mauro Abi [UNIFESP]
Simoes, Ricardo Santos
Baracat, Edmund Chada [UNIFESP]
Soares Junior, Jose Maria [UNIFESP]
Type
Artigo
ISSN
0378-5122
Is part of
Maturitas
DOI
10.1016/j.maturitas.2006.07.011
Metadata
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Abstract
Objective: the aim of this study was to evaluate the effects of different doses of a standardized soy extract on the uterus of castrated rats.Methods: Fifty-six adult castrated female Wistar rats were randomly divided into seven groups (eight animals in each) that received: GI-drug vehicle (propylene glycol); GII-soy extract 10mg/kg per day; GIII-soy extract 50mg/kg per day; GIV-soy extract 100mg/kg per day; GV-soy extract 300mg/kg per day; GVI-soy extract 600mg/kg per day; GVII-conjugated equine estrogens (CEE) 200 mu g/kg per day. After 21 days of treatment, all animals were sacrificed and fragments of the uterine horns were immediately removed, fixed in 10% formaldehyde and submitted to routine histological techniques for morphometric study. the endometrial cell proliferation index was determined with the PCNA antibody PC-10 and expressed as the percentuals of the PCNA-positive nuclei relative to the total countings. Other fragments were immediately frozen in liquid nitrogen for RNA extraction and VEGF analysis using RT-PCR technique.Results: the minimal dose of soy extract that produced a significant increase of the morphometric parameters was 100 mg/kg (GIV). the maximum effects on endometrial and myometrial morphometry were detected in the groups treated with 300 and 600 mg/kg of soy extract (groups V and VI) and CEE (GVII). the expression of PCNA in the endometrial epithelium and stroma was increased by treatment with 100-600 mg/kg per day of soy extract (groups IV-VI) or with CCE (group VII). Doses equal to or higher than 50 mg/kg of soy extract (groups III-VI) and CEE stimulated the expression of VEGF.Conclusion: the treatment of adult castrated rats during 21 days with doses of 100 mg/kg per day or higher of soy extract may determine significant proliferation in the endometrium and myometrium. (c) 2006 Published by Elsevier Ireland Ltd.
Citation
Maturitas. Clare: Elsevier B.V., v. 56, n. 2, p. 173-183, 2007.
Keywords
soy extract
isoflavones
castrated rat
uterus
VEGF
morphology
endometrium
URI
http://repositorio.unifesp.br/handle/11600/29513
Collections
  • Em verificação - Geral [7517]
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