钙感受器刺激诱导乳腺癌细胞非选择性阳离子通道激活。
文章的细节
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引用
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El Hiani Y, Ahidouch A, Roudbaraki M, Guenin S, Brule G, Ouadid-Ahidouch H
钙感受器刺激诱导乳腺癌细胞非选择性阳离子通道激活。
中国生物医学工程学报。2006;21(2):339 - 339。Epub 2006 10月14日。
- PubMed ID
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17041782 (PubMed视图]
- 摘要
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钙敏感受体(CaR)在正常人类乳腺和乳腺癌组织的上皮管中表达,通过免疫组织化学和Western blot分析,也在MCF-7细胞系中表达。然而,到目前为止,还没有关于CaR在乳腺癌细胞中的转导途径的数据。在这项研究中,我们发现CaR激动剂、精胺和增加的细胞外Ca(2+) ([Ca(2+)](o))在-80 mV下依次激活两个向内电流。第一种对Ca(2+)具有高渗透性,被2-氨基苯基硼酸盐(2- apb)抑制;相比之下,对Na(+)和Li(+)更敏感,对Ca(2+)不敏感。此外,高Mg(2+)、氟灭酸或阿米洛利灌注的细胞内透析对第二电流没有任何影响。两种电流均被La(3+)抑制。钙成像记录显示[Ca(2+)](o)和精胺均可引起细胞内钙([Ca(2+)](i)的升高,细胞外Ca(2+)的去除或灌注2- apb可引起[Ca(2+)](i)的下降。众所周知,通过增加[Ca(2+)](o)或精胺对CaR的刺激与磷脂酶C (PLC)的激活有关。抑制PLC可降低[Ca(2+)](o)刺激[Ca(2+)](i)的增加。 Lastly, reverse-transcriptase polymerase chain reaction showed that MCF-7 cells expressed canonical transient receptor potential (TRPCs) channels. Our results suggest that, in MCF-7 cells, CaR is functionally coupled to Ca(2+)-permeable cationic TRPCs, for which TRPC1 and TRPC6 are the most likely candidates for the highly selective Ca(2+) current. Moreover, the pharmacology of the second Na(+) current excludes the involvement of the more selective Na(+) transient receptor potential melastatin (TRPM4 and TRPM5) and the classical epithelial Na(+ )channels.