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整合素α2和β1与肝癌细胞中mTOR/AKT及细胞周期蛋白依赖性激酶-细胞周期蛋白轴的相互作用

Integrin α2 and β1 Cross-Communication with mTOR/AKT and the CDK-Cyclin Axis in Hepatocellular Carcinoma Cells.

作者信息

Juratli Mazen A, Zhou He, Oppermann Elsie, Bechstein Wolf O, Pascher Andreas, Chun Felix K-H, Juengel Eva, Rutz Jochen, Blaheta Roman A

机构信息

Department of General and Visceral Surgery, Goethe-University, 60590 Frankfurt am Main, Germany.

Department of General, Visceral and Transplant Surgery, Muenster University Hospital, 48149 Muenster, Germany.

出版信息

Cancers (Basel). 2022 May 14;14(10):2430. doi: 10.3390/cancers14102430.

Abstract

Integrin receptors contribute to hepatocellular carcinoma (HCC) invasion, while AKT-mTOR signaling controls mitosis. The present study was designed to explore the links between integrins and the AKT-mTOR pathway and the CDK-Cyclin axis. HCC cell lines (HepG2, Huh7, Hep3B) were stimulated with soluble collagen or Matrigel to activate integrins, or with insulin-like growth factor 1 (IGF1) to activate AKT-mTOR. HCC growth, proliferation, adhesion, and chemotaxis were evaluated. AKT/mTOR-related proteins, proteins of the CDK-Cyclin axis, focal adhesion kinase (FAK), and integrin-linked kinase (ILK) were determined following IGF1-stimulation or integrin knockdown. Stimulation with collagen or Matrigel increased tumor cell growth and proliferation. This was associated with significant alteration of the integrins α2, αV, and β1. Blockade of these integrins led to cell cycle arrest in G2/M and diminished the number of tumor cell clones. Knocking down the integrins α2 or β1 suppressed ILK, reduced FAK-phosphorylation and diminished AKT/mTOR, as well as the proteins of the CDK-Cyclin axis. Activating the cells with IGF1 enhanced the expression of the integrins α2, αV, β1, activated FAK, and increased tumor cell adhesion and chemotaxis. Blocking the AKT pathway canceled the enhancing effect of IGF on the integrins α2 and β1. These findings reveal that HCC growth, proliferation, and invasion are controlled by a fine-tuned network between α2/β1-FAK signaling, the AKT-mTOR pathway, and the CDK-Cyclin axis. Concerted blockade of the integrin α2/β1 complex along with AKT-mTOR signaling could, therefore, provide an option to prevent progressive dissemination of HCC.

摘要

整合素受体促进肝细胞癌(HCC)的侵袭,而AKT-mTOR信号传导控制有丝分裂。本研究旨在探索整合素与AKT-mTOR通路以及CDK-细胞周期蛋白轴之间的联系。用可溶性胶原蛋白或基质胶刺激HCC细胞系(HepG2、Huh7、Hep3B)以激活整合素,或用胰岛素样生长因子1(IGF1)激活AKT-mTOR。评估HCC的生长、增殖、黏附和趋化性。在IGF1刺激或整合素敲低后,测定AKT/mTOR相关蛋白、CDK-细胞周期蛋白轴的蛋白、粘着斑激酶(FAK)和整合素连接激酶(ILK)。胶原蛋白或基质胶刺激可增加肿瘤细胞的生长和增殖。这与整合素α2、αV和β1的显著改变有关。阻断这些整合素会导致细胞周期停滞在G2/M期,并减少肿瘤细胞克隆的数量。敲低整合素α2或β1可抑制ILK,降低FAK磷酸化,并减少AKT/mTOR以及CDK-细胞周期蛋白轴的蛋白。用IGF1激活细胞可增强整合素α2、αV、β1的表达,激活FAK,并增加肿瘤细胞的黏附和趋化性。阻断AKT通路可消除IGF对整合素α2和β1的增强作用。这些发现表明,HCC的生长、增殖和侵袭受α2/β1-FAK信号传导、AKT-mTOR通路和CDK-细胞周期蛋白轴之间精细调节的网络控制。因此,协同阻断整合素α2/β1复合物以及AKT-mTOR信号传导可能为预防HCC的进展性扩散提供一种选择。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b4a/9139686/b1395debbab9/cancers-14-02430-g001.jpg

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