Spatial regulation of the glycocalyx component podocalyxin is a switch for prometastatic function.

Spatial regulation of the glycocalyx component podocalyxin is a switch for prometastatic function.
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DOI:
10.1126/sciadv.abq1858
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发表时间:
2023-02-03
期刊:
影响因子:
13.6
通讯作者:
--
中科院分区:
综合性期刊1区
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糖萼组分和唾液粘蛋白足萼蛋白(PODXL)是正常组织发育所需的,通过促进细胞之间形成顶端膜,触发管腔形成。PODXL表达升高也与多种肿瘤类型的转移和不良临床结果相关。PODXL如何呈现这种二元性仍然是未知的。我们鉴定了PODXL作为半乳糖凝集素-3(GAL 3)的诱饵受体的意外功能,由此PODXL-GAL 3相互作用释放GAL 3对基于整合素的侵袭的抑制。差异皮质靶向的PODXL,调节泛素化,是控制交替命运的分子机制。PODXL高和低表面水平都发生在癌细胞内的平行亚群中。原位前列腺内异种移植的PODXL操纵的细胞或那些具有不同的表面水平的PODXL定义,该轴控制体内转移。在临床上,PODXL-GAL 3之间的相互作用使前列腺癌患者的预后较差。我们的研究确定了PODXL促进侵袭和转移的分子机制和背景。Podxl通过充当抑制侵袭的糖萼组分半乳糖凝集素-3的诱饵受体来促进转移。
The glycocalyx component and sialomucin podocalyxin (PODXL) is required for normal tissue development by promoting apical membranes to form between cells, triggering lumen formation. Elevated PODXL expression is also associated with metastasis and poor clinical outcome in multiple tumor types. How PODXL presents this duality in effect remains unknown. We identify an unexpected function of PODXL as a decoy receptor for galectin-3 (GAL3), whereby the PODXL-GAL3 interaction releases GAL3 repression of integrin-based invasion. Differential cortical targeting of PODXL, regulated by ubiquitination, is the molecular mechanism controlling alternate fates. Both PODXL high and low surface levels occur in parallel subpopulations within cancer cells. Orthotopic intraprostatic xenograft of PODXL-manipulated cells or those with different surface levels of PODXL define that this axis controls metastasis in vivo. Clinically, interplay between PODXL-GAL3 stratifies prostate cancer patients with poor outcome. Our studies define the molecular mechanisms and context in which PODXL promotes invasion and metastasis. Podxl promotes metastasis by acting as a decoy receptor for the invasion-repressing glycocalyx component Galectin-3.
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