The CCL2-CCR2 astrocyte-cancer cell axis in tumor extravasation at the brain.

The CCL2-CCR2 astrocyte-cancer cell axis in tumor extravasation at the brain.
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脑肿瘤外渗中的CCL 2-CCR 2星形胶质细胞-癌细胞轴。

DOI:
10.1126/sciadv.abg8139
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发表时间:
2021-06
期刊:
影响因子:
13.6
通讯作者:
Kamm RD
Kamm RD
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hajal C;Shin Y;Li L;Serrano JC;Jacks T;Kamm RD

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星形胶质细胞分泌的CCL 2通过趋化性和趋化作用促进癌细胞在脑中外渗。虽然脑转移在癌症患者中很常见,但对癌症外渗穿过血脑屏障(BBB)的机制知之甚少,血脑屏障是调节癌细胞进入脑实质的转移级联中的关键步骤。在这里,我们显示,在体外血脑屏障微血管模型的三维,星形胶质细胞促进癌细胞通过分泌C-C基序趋化因子配体2(CCL 2)的迁移。我们发现,这种主要由星形胶质细胞产生的趋化因子通过其C-C趋化因子受体2(CCR 2)促进癌细胞的趋化性和趋化运动,而血管通透性没有显著变化。这些发现在体内得到了验证,其中CCR 2缺陷型癌细胞在小鼠脑毛细血管中表现出显著降低的阻滞和迁移率。我们的研究结果表明,CCL 2-CCR 2星形胶质细胞-癌细胞轴在外渗中起着重要作用,因此,转移到大脑。
Astrocyte-secreted CCL2 promotes cancer cell extravasation at the brain via chemotaxis and chemokinesis. Although brain metastases are common in cancer patients, little is known about the mechanisms of cancer extravasation across the blood-brain barrier (BBB), a key step in the metastatic cascade that regulates the entry of cancer cells into the brain parenchyma. Here, we show, in a three-dimensional in vitro BBB microvascular model, that astrocytes promote cancer cell transmigration via their secretion of C-C motif chemokine ligand 2 (CCL2). We found that this chemokine, produced primarily by astrocytes, promoted the chemotaxis and chemokinesis of cancer cells via their C-C chemokine receptor type 2 (CCR2), with no notable changes in vascular permeability. These findings were validated in vivo, where CCR2-deficient cancer cells exhibited significantly reduced rates of arrest and transmigration in mouse brain capillaries. Our results reveal that the CCL2-CCR2 astrocyte-cancer cell axis plays a fundamental role in extravasation and, consequently, metastasis to the brain.
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