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Xu J, Zhang Z, Huang L, Xiong J, Zhou Z, Yu H, Wu L, Liu Z, Cao K. Let-7a suppresses Ewing sarcoma CSCs' malignant phenotype via forming a positive feedback circuit with STAT3 and lin28. J Bone Oncol 2021; 31:100406. [PMID: 34917467 PMCID: PMC8645918 DOI: 10.1016/j.jbo.2021.100406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 06/14/2021] [Revised: 10/27/2021] [Accepted: 11/29/2021] [Indexed: 11/17/2022] Open
Abstract
Let-7a was repressed in the cancer stem cells of Ewing sarcoma(ES-CSCs). Increase the expression of let-7a suppress the ability of colony formation and invasion of ES-CSCs. Let-7a, STAT3 and lin28 form a positive feedback circuit in ES-CSCs. Increase the expression of let-7a suppress xenograft tumor growth of ES-CSCs.
Cancer stem cells (CSCs) have been documented to be closely related with tumor metastasis and recurrence, and the same important role were identified in Ewing Sarcoma (ES). In our previous study, we found that let-7a expression was repressed in ES. Herein, we further identified its putative effects in the CSCs of ES (ES-CSCs). The expression of let-7a was consistently suppressed in the separated side population (SP) cells, which were identified to contain the characteristics of the stem cells. Then, we increased the expression of let-7a in ES-CSCs, and found that the ability of colony formation and invasion of ES-CSCs were suppressed in vitro. The same results were found in the tumor growth of ES-CSCs’ xenograft mice in vivo. To further explore the putative mechanism involved, we also explored whether signal transducer and activator of transcription 3 (STAT3) was involved in the suppressive effects. As expected, excessive expression of let-7a could suppress the expression STAT3 in the ES-CSCs, and repressed the expression of STAT3 imitated the suppressive effects of let-7a on ES-CSCs, suppressing the ability of colony formation and invasion of ES-CSCs. Furthermore, we found lin28 was involved in the relative impacts of let-7a, as well as STAT3. Let-7a, STAT3 and lin28 might form a positive feedback circuit, which serve a pivotal role in the carcinogensis of ES-CSCs. These findings maybe provide assistance for patients with ES in the future, especially those with metastasis and recurrence, and new directions for their treatment.
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Key Words
- ABCG2, ATP-binding cassette transporter G 2
- ATCC, American Type Culture Collection
- CSCs, Cancer stem cells
- Cancer stem cells
- ES, Ewing Sarcoma
- ES-CSCs, CSCs of ES
- Ewing sarcoma
- FBS, fatal bovine serum
- Let-7a
- Lin28
- MMP2, Matrix Metallopeptidase 2
- MSCs, mesenchymal stem cells
- ORF, open reading frame
- PBS, phosphate buffer saline
- PI, propidium iodide
- SP, side populationl
- STAT3
- STAT3, signal transducer and activator of transcription 3
- iPSCs, human induced pluripotent stem cells
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Affiliation(s)
- Jiang Xu
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, PR China
| | - Zhongzu Zhang
- Department of Orthopedics, The Yongchuan Hospital of Chongqing Medical University, Chongqing 402160, PR China
| | - Lu Huang
- Department of Children Health and Care, Jiangxi Maternal and Child Health Hospital, Nanchang, Jiangxi 330006, PR China
| | - Jiachao Xiong
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, PR China
| | - Zhenhai Zhou
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, PR China
| | - Honggui Yu
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, PR China
| | - Liang Wu
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, PR China
| | - Zhimin Liu
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, PR China
| | - Kai Cao
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, PR China
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