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  • Title: The effects of soy extract on the uterus of castrated adult rats.
    Author: Mosquette R, de Jesus Simões M, da Silva ID, Oshima CT, Oliveira-Filho RM, Haidar MA, Simões RS, Baracat EC, Soares Júnior JM.
    Journal: Maturitas; 2007 Feb 20; 56(2):173-83. PubMed ID: 16997514.
    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) 200microg/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 100mg/kg (GIV). The maximum effects on endometrial and myometrial morphometry were detected in the groups treated with 300 and 600mg/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 100-600mg/kg per day of soy extract (groups IV-VI) or with CCE (group VII). Doses equal to or higher than 50mg/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 100mg/kg per day or higher of soy extract may determine significant proliferation in the endometrium and myometrium.
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