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Regulation of the bi-directional cross-talk between ovarian cancer cells and adipocytes by SPARC.
Oncogene ( IF 6.9 ) Pub Date : 2019-02-14 , DOI: 10.1038/s41388-019-0728-3
Bincy John 1 , Christine Naczki 1 , Chirayu Patel 1 , Alia Ghoneum 1 , Shadi Qasem 2, 3 , Ziyan Salih 2, 4 , Neveen Said 1, 2, 5
Affiliation  

Ovarian cancer (OvCa) exhibits a specific predilection for metastasis to the omentum. Our earlier studies highlighted the tumour-suppressor effect of secreted protein acidic and rich in cysteine (SPARC) in OvCa through multi-faceted roles inhibiting cancer cell interactions within the peritoneal milieu. The goal of this study is to investigate the role of SPARC in OvCa interactions with omental adipocytes and its role in OvCa colonization in the omentum. We employed multi-pronged approach using primary omental adipocytes from Sparc knockout mice, genetically engineered human omental adipocytes in 3D co-cultures with OvCa cells, as well as treatment with recombinant SPARC protein. We show that SPARC suppresses multistep cascade in OvCa omental metastasis. SPARC inhibited in vivo and adipocyte-induced homing, proliferation, and invasion of OvCa cells. SPARC suppressed metabolic programming of both adipocytes and OvCa cells and exerted an inhibitory effect of adipocyte differentiation and their phenotypic switch to cancer-associated phenotype. Mechanistic studies revealed that this effect is mediated through inhibition of cEBPβ-NFkB-AP-1 transcription machinery. These findings define a novel and functionally important role of SPARC in OvCa and not only bridge the knowledge gap but highlight the need to consider SPARC protein expression in therapeutic development.

中文翻译:

SPARC 调节卵巢癌细胞和脂肪细胞之间的双向串扰。

卵巢癌 (OvCa) 表现出对网膜转移的特定偏好。我们早期的研究强调了 OvCa 中分泌的酸性和富含半胱氨酸的蛋白质 (SPARC) 通过抑制腹膜环境内癌细胞相互作用的多方面作用的肿瘤抑制作用。本研究的目的是研究 SPARC 在 OvCa 与网膜脂肪细胞相互作用中的作用及其在 OvCa 在网膜定植中的作用。我们采用多管齐下的方法,使用来自 Sparc 基因敲除小鼠的原代网膜脂肪细胞、基因工程人类网膜脂肪细胞与 OvCa 细胞进行 3D 共培养,以及使用重组 SPARC 蛋白进行治疗。我们显示 SPARC 抑制 OvCa 网膜转移中的多步级联。SPARC 抑制体内和脂肪细胞诱导的归巢、增殖、和 OvCa 细胞的侵袭。SPARC 抑制脂肪细胞和 OvCa 细胞的代谢程序,并发挥抑制脂肪细胞分化及其表型转变为癌症相关表型的作用。机制研究表明,这种效应是通过抑制 cEBPβ-NFkB-AP-1 转录机制介导的。这些发现定义了 SPARC 在 OvCa 中的一种新颖且功能重要的作用,不仅弥合了知识鸿沟,而且强调了在治疗开发中考虑 SPARC 蛋白表达的必要性。机制研究表明,这种效应是通过抑制 cEBPβ-NFkB-AP-1 转录机制介导的。这些发现定义了 SPARC 在 OvCa 中的一种新颖且功能重要的作用,不仅弥合了知识鸿沟,而且强调了在治疗开发中考虑 SPARC 蛋白表达的必要性。机制研究表明,这种效应是通过抑制 cEBPβ-NFkB-AP-1 转录机制介导的。这些发现定义了 SPARC 在 OvCa 中的一种新颖且功能重要的作用,不仅弥合了知识鸿沟,而且强调了在治疗开发中考虑 SPARC 蛋白表达的必要性。
更新日期:2019-02-15
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