Purified malignant mammary epithelial cells maintain hormone responsiveness in culture.

Purified malignant mammary epithelial cells maintain hormone responsiveness in culture.
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DOI:
10.1038/sj.bjc.6600866
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发表时间:
2003-04-07
影响因子:
8.8
通讯作者:
--
中科院分区:
医学1区
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--
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目前,乳腺癌的治疗是通过原发肿瘤雌激素受体α(ERα)的免疫组织化学染色来确定的。然而,部分ERα阳性患者对他莫昔芬无效,而部分ERα阴性患者对他莫昔芬有反应。在这里,我们描述了一种新的程序,以纯化恶性乳腺上皮细胞,试图在早期阶段识别这些患者。通过免疫组织化学染色、细胞学和荧光原位杂交(FISH),我们能够将恶性细胞提纯到90%的纯度。虽然恶性细胞可以在培养中保持,但它们不会增殖,这与乳房缩小手术中提纯的乳腺上皮细胞不同。此外,在恶性肿瘤细胞中,ERα和孕激素受体(PR)的表达保持不变,而在正常的上皮细胞中,ERα和PR迅速丢失。对分离的恶性细胞进行了功能研究,以了解它们对雌二醇和他莫昔芬的反应。在7个ERα阳性的肿瘤中,有4个在他莫昔芬治疗后细胞数量显著减少,ERα阴性的肿瘤没有反应。我们得出的结论是:(A)可以在足够长的时间内纯化和维持乳腺癌细胞,以便进行功能研究;(B)ERα保留在培养中,有利于这些细胞在体外研究内分泌反应和耐药的机制。
Currently, the therapy for breast cancer is determined by immunohistochemical staining of the primary tumour for oestrogen receptor alpha (ERα). However, a proportion of ERα-positive patients fail to respond to tamoxifen and a proportion of ERα-negative patients show response. Here, we describe a novel procedure for the purification of malignant breast epithelial cells in an attempt to identify these patients at an early stage. Using this procedure, we are able to purify malignant cells to >90% purity as determined by immunohistochemical staining, cytology and fluorescent in situ hybridisation (FISH). While the malignant cells can be maintained in culture they do not proliferate in contrast to purified breast epithelial cells from reduction mammoplasties. Moreover, ERα and progesterone receptor (PR) expression is maintained in malignant cells, whereas normal epithelial cells rapidly lose ERα and PR. Functional studies were performed on the separated malignant cells in terms of their response to oestradiol and tamoxifen. Four out of the seven ERα-positive tumours showed a significant reduction in cell numbers after tamoxifen treatment compared to oestradiol, ERα negative tumours failed to show a response. We conclude that (a) it is possible to purify and maintain breast cancer cells for a sufficient period to permit functional studies and (b) ERα is retained in culture facilitating the use of these cells in studies of the mechanism of endocrine response and resistance in vitro.
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影响因子: 11.1
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发表时间: 1999-02-25
影响因子: 3.7
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DOI: 10.1073/pnas.89.12.5321
发表时间: 1992-06-15
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