Protein secretion in human mammary epithelial cells following HER1 receptor activation: influence of HER2 and HER3 expression.

Protein secretion in human mammary epithelial cells following HER1 receptor activation: influence of HER2 and HER3 expression.
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DOI:
10.1186/1471-2407-11-69
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发表时间:
2011-02-14
期刊:
影响因子:
3.8
通讯作者:
Zangar RC
Zangar RC
中科院分区:
医学2区
文献类型:
--
作者:
Zhang Y;Gonzalez RM;Zangar RC

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乳腺细胞分泌的蛋白质导致自分泌和旁分泌信号传导,从而定义细胞生长、迁移和细胞外环境。即便如此,我们对调节蛋白质分泌的细胞过程的了解仍然有限。在这项研究中,我们利用人上皮乳腺细胞 (HMEC) 系,这些细胞系经过改造可表达不同水平的 HER1、HER2 和 HER3。使用 ELISA 微阵列平台,我们评估了 HER1 受体激活开始后,表皮生长因子家族受体 (HER) 表达对 HMEC 系中蛋白质分泌的影响。分泌蛋白包括三种 HER1 配体、白细胞介素 1α 和 18、RANTES、血管内皮和血小板衍生生长因子、基质金属蛋白酶 1、2 和 9,以及 HER1 和 HER2 蛋白的细胞外部分。此外,我们还研究了 MAPK/Erk 和 PI3K/Akt 信号传导是否调节这些细胞系中的蛋白质分泌,如果是的话,HER2 或 HER3 受体的参与是否会改变它们对 MAPK/Erk 和 PI3K/Akt 信号通路抑制在蛋白质分泌方面的反应。 HER2 和 HER3 受体的差异表达会改变多种生长因子、细胞因子和蛋白酶的分泌。当 MAPK/Erk 或 PI3K/Akt 信号转导受到抑制时,仍然可以观察到蛋白质分泌的一些变化。这项研究表明,HER 过度表达通过改变多种生物活性蛋白的分泌来协调肿瘤微环境的广泛变化。
Protein secretion by mammary cells results in autocrine and paracrine signaling that defines cell growth, migration and the extracellular environment. Even so, we have a limited understanding of the cellular processes that regulate protein secretion. In this study, we utilize human epithelial mammary cell (HMEC) lines that were engineered to express different levels of HER1, HER2 and HER3. Using an ELISA microarray platform, we evaluate the effects of epidermal growth factor family receptor (HER) expression on protein secretion in the HMEC lines upon initiation of HER1 receptor activation. The secreted proteins include three HER1 ligands, interleukins 1α and 18, RANTES, vascular-endothelial and platelet-derived growth factors, matrix metalloproteases 1, 2 and 9, and the extracellular portion of the HER1 and HER2 proteins. In addition, we investigate whether MAPK/Erk and PI3K/Akt signaling regulate protein secretion in these cell lines and if so, whether the involvement of HER2 or HER3 receptor alters their response to MAPK/Erk and PI3K/Akt signal pathway inhibition in terms of protein secretion. Differential expression of HER2 and HER3 receptors alters the secretion of a variety of growth factors, cytokines, and proteases. Some alterations in protein secretion are still observed when MAPK/Erk or PI3K/Akt signaling is inhibited. This study suggests that HER overexpression orchestrates broad changes in the tumor microenvironment by altering the secretion of a diverse variety of biologically active proteins.
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