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Li P, Chen Y, Peng Y, Zhang Y, Zhou H, Chen X, Li T, Li S, Yang H, Wu C, Zheng C, Zhu J, You F, Li L, Qin X, Liu Y. Notch-1 signaling promotes reattachment of suspended cancer cells by cdc42-dependent microtentacles formation. Cancer Sci 2021; 112:4894-4908. [PMID: 34582616 PMCID: PMC8645759 DOI: 10.1111/cas.15146] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 09/15/2021] [Accepted: 09/23/2021] [Indexed: 01/14/2023] Open
Abstract
Circulating tumor cells (CTCs) are associated with a higher risk of metastasis in tumor patients. The adhesion and arrest of CTCs at a secondary site is an essential prerequisite for the occurrence of tumor metastasis. CTC reattachment has shown to be dependent on microtentacle (McTN) formation in vivo. However, the specific molecular mechanism of McTN formation in suspended cancer cells remains largely unclear. Here, we demonstrated that the activation of Notch-1 signaling triggers McTN formation to facilitate cell reattachment in suspended cell culture conditions. Moreover, molecular mechanistic studies revealed that McTN formation is governed by the balance between microtubule-driven outgrowth and actomyosin-driven cell contractility. The activation of Notch-1 downregulates the acetylation level of microtubules via the Cdc42/HDAC6 pathway, which contributes to microtubule polymerization. Simultaneously, Notch-1 signaling-induced Cdc42 activation also reduced phosphorylation of myosin regulatory light chain, leading to cell contractility attenuation. Altogether, these results defined a novel mechanism by which Notch-1 signaling disturbs the balance between the expansion of microtubules and contraction of the cortical actin, which promotes McTN formation and cell reattachment. Our findings provide a new perspective on the effective therapeutic target to prevent CTC reattachment.
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Affiliation(s)
- Ping Li
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Yu Chen
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Yueting Peng
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Yixi Zhang
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Hanying Zhou
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Xiangyan Chen
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Tingting Li
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Shun Li
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Hong Yang
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Chunhui Wu
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Chuan Zheng
- TCM Regulating Metabolic Diseases Key Laboratory of Sichuan Province, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Jie Zhu
- TCM Regulating Metabolic Diseases Key Laboratory of Sichuan Province, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Fengming You
- TCM Regulating Metabolic Diseases Key Laboratory of Sichuan Province, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Li Li
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Xiang Qin
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Yiyao Liu
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China.,TCM Regulating Metabolic Diseases Key Laboratory of Sichuan Province, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
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Vargas-Accarino E, Herrera-Montávez C, Ramón Y Cajal S, Aasen T. Spontaneous Cell Detachment and Reattachment in Cancer Cell Lines: An In Vitro Model of Metastasis and Malignancy. Int J Mol Sci 2021; 22:4929. [PMID: 34066490 DOI: 10.3390/ijms22094929] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 04/27/2021] [Accepted: 04/30/2021] [Indexed: 11/16/2022] Open
Abstract
There is an unmet need for simplified in vitro models of malignancy and metastasis that facilitate fast, affordable and scalable gene and compound analysis. "Adherent" cancer cell lines frequently release "free-floating" cells into suspension that are viable and can reattach. This, in a simplistic way, mimics the metastatic process. We compared the gene expression profiles of naturally co-existing populations of floating and adherent cells in SW620 (colon), C33a (cervix) and HeLa (cervix) cancer cells. We found that 1227, 1367 and 1333 genes were at least 2-fold differentially expressed in the respective cell lines, of which 122 were shared among the three cell lines. As proof of principle, we focused on the anti-metastatic gene NM23-H1, which was downregulated both at the RNA and protein level in the floating cell populations of all three cell lines. Knockdown of NM23-H1 significantly increased the number of floating (and viable) cells, whereas overexpression of NM23-H1 significantly reduced the proportion of floating cells. Other potential regulators of these cellular states were identified through pathway analysis, including hypoxia, mTOR (mechanistic target of rapamycin), cell adhesion and cell polarity signal transduction pathways. Hypoxia, a condition linked to malignancy and metastasis, reduced NM23-H1 expression and significantly increased the number of free-floating cells. Inhibition of mTOR or Rho-associated protein kinase (ROCK) significantly increased cell death specifically in the floating and not the adherent cell population. In conclusion, our study suggests that dynamic subpopulations of free-floating and adherent cells is a useful model to screen and identify genes, drugs and pathways that regulate the process of cancer metastasis, such as cell detachment and anoikis.
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