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Epididymal cribriform hyperplasia with nuclear atypia in p53 homozygous knockout mice on a mixed 129/Sv-FVB/N background

机译:在混合129 / Sv-FVB / N背景下p53纯合敲除小鼠的附睾筛状增生伴核型异型

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Epididymal cribriform hyperplasia (ECH) is a variant of normal epididymal histologic features in men, and has also been reported in rats, mice, dogs, cats, and bulls. The epididymal change has been associated with aging, testicular atrophy, cryptorchidism, and germ cell tumors. Epididymal cribriform hyperplasia was observed in p53 homozygous knockout mice on a mixed 129/Sv-FVB/N background, but not in wild-type or heterozygous mice. The aim of the study reported here was to determine the prevalence and characterize the morphologic, immunohistochemical, and ultrastructural features of ECH in these mice. Epididymal cribriform hyperplasia was present in 88% (72/82) of male mice ranging in age from seven to 65 weeks. The lesion was characterized microscopically by epithelial cells with atypical hyperchromatic nuclei, vacuolization, intratubular lumina formation, infrequent apoptosis, and rare mitotic figures. In contrast to germ cells, the cells of ECH did not express a-fetoprotein, carcinoembryonic antigen, or S-100. Ultrastructurally, the cells were pleomorphic with stereocilia at their apical borders and within intratubular lumina, and were supported by a basement membrane. Although 14% (10/72) of mice had concomitant testicular neoplasia, ECH did not appear to be a preneoplastic change. Investigators using these mice for modeling human disease should be aware of the background prevalence of this lesion.
机译:附睾筛状增生(ECH)是男性正常附睾组织学特征的一种变体,并且在大鼠,小鼠,狗,猫和公牛中也有报道。附睾变化与衰老,睾丸萎缩,隐睾症和生殖细胞肿瘤有关。在混合的129 / Sv-FVB / N背景下的p53纯合敲除小鼠中观察到附睾筛状增生,而在野生型或杂合小鼠中未观察到。本文报道的研究目的是确定这些小鼠中ECH的患病率并表征其形态,免疫组化和超微结构特征。在7至65周龄的雄性小鼠中,附睾筛状增生存在于88%(72/82)的雄性小鼠中。病变的特征是上皮细胞具有非典型的增色核,空泡化,管腔内形成,罕见的细胞凋亡和罕见的有丝分裂形态。与生殖细胞相反,ECH细胞不表达甲胎蛋白,癌胚抗原或S-100。在超微结构中,这些细胞是多形的,在其顶缘和管状内腔内有立体纤毛,并由基底膜支持。尽管有14%(10/72)的小鼠伴有睾丸肿瘤,但ECH似乎不是肿瘤前的变化。使用这些小鼠为人类疾病建模的研究人员应了解该病变的背景患病率。

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