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Wang X, Chen T, Li C, Li W, Zhou X, Li Y, Luo D, Zhang N, Chen B, Wang L, Zhao W, Fu S, Yang Q. CircRNA-CREIT inhibits stress granule assembly and overcomes doxorubicin resistance in TNBC by destabilizing PKR. J Hematol Oncol 2022; 15:122. [PMID: 36038948 PMCID: PMC9425971 DOI: 10.1186/s13045-022-01345-w] [Citation(s) in RCA: 60] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 08/23/2022] [Indexed: 11/10/2022] Open
Abstract
Background Circular RNAs (circRNAs) represent a novel type of regulatory RNA characterized by high evolutionary conservation and stability. CircRNAs are expected to be potential diagnostic biomarkers and therapeutic targets for a variety of malignancies. However, the regulatory functions and underlying mechanisms of circRNAs in triple-negative breast cancer (TNBC) are largely unknown. Methods By using RNA high-throughput sequencing technology, qRT-PCR and in situ hybridization assays, we screened dysregulated circRNAs in breast cancer and TNBC tissues. Then in vitro assays, animal models and patient-derived organoids (PDOs) were utilized to explore the roles of the candidate circRNA in TNBC. To investigate the underlying mechanisms, RNA pull-down, RNA immunoprecipitation (RIP), co immunoprecipitation (co-IP) and Western blotting assays were carried out. Results In this study, we demonstrated that circRNA-CREIT was aberrantly downregulated in doxorubicin resistant triple-negative breast cancer (TNBC) cells and associated with a poor prognosis. The RNA binding protein DHX9 was responsible for the reduction in circRNA-CREIT by interacting with the flanking inverted repeat Alu (IRAlu) sequences and inhibiting back-splicing. By utilizing in vitro assays, animal models and patient-derived organoids, we revealed that circRNA-CREIT overexpression significantly enhanced the doxorubicin sensitivity of TNBC cells. Mechanistically, circRNA-CREIT acted as a scaffold to facilitate the interaction between PKR and the E3 ligase HACE1 and promoted proteasomal degradation of PKR protein via K48-linked polyubiquitylation. A reduced PKR/eIF2α signaling axis was identified as a critical downstream effector of circRNA-CREIT, which attenuated the assembly of stress granules (SGs) to activate the RACK1/MTK1 apoptosis signaling pathway. Further investigations revealed that a combination of the SG inhibitor ISRIB and doxorubicin synergistically inhibited TNBC tumor growth. Besides, circRNA-CREIT could be packaged into exosomes and disseminate doxorubicin sensitivity among TNBC cells. Conclusions Our study demonstrated that targeting circRNA-CREIT and SGs could serve as promising therapeutic strategies against TNBC chemoresistance. Supplementary Information The online version contains supplementary material available at 10.1186/s13045-022-01345-w.
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Affiliation(s)
- Xiaolong Wang
- Department of Breast Surgery, General Surgery, Qilu Hospital of Shandong University, No. 107 Wenhua Xi Road, Jinan, 250012, Shandong, China
| | - Tong Chen
- Department of Breast Surgery, General Surgery, Qilu Hospital of Shandong University, No. 107 Wenhua Xi Road, Jinan, 250012, Shandong, China
| | - Chen Li
- Department of Breast Surgery, General Surgery, Qilu Hospital of Shandong University, No. 107 Wenhua Xi Road, Jinan, 250012, Shandong, China
| | - Wenhao Li
- Department of Breast Surgery, General Surgery, Qilu Hospital of Shandong University, No. 107 Wenhua Xi Road, Jinan, 250012, Shandong, China
| | - Xianyong Zhou
- Department of Breast Surgery, General Surgery, Qilu Hospital of Shandong University, No. 107 Wenhua Xi Road, Jinan, 250012, Shandong, China
| | - Yaming Li
- Department of Breast Surgery, General Surgery, Qilu Hospital of Shandong University, No. 107 Wenhua Xi Road, Jinan, 250012, Shandong, China
| | - Dan Luo
- Department of Breast Surgery, General Surgery, Qilu Hospital of Shandong University, No. 107 Wenhua Xi Road, Jinan, 250012, Shandong, China
| | - Ning Zhang
- Department of Breast Surgery, General Surgery, Qilu Hospital of Shandong University, No. 107 Wenhua Xi Road, Jinan, 250012, Shandong, China
| | - Bing Chen
- Pathology Tissue Bank, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Lijuan Wang
- Pathology Tissue Bank, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Wenjing Zhao
- Pathology Tissue Bank, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Shanji Fu
- Department of Clinical Laboratory, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Qifeng Yang
- Department of Breast Surgery, General Surgery, Qilu Hospital of Shandong University, No. 107 Wenhua Xi Road, Jinan, 250012, Shandong, China. .,Pathology Tissue Bank, Qilu Hospital of Shandong University, Jinan, Shandong, China. .,Research Institute of Breast Cancer, Shandong University, Jinan, Shandong, China.
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Ectopic Expression of Ankrd2 Affects Proliferation, Motility and Clonogenic Potential of Human Osteosarcoma Cells. Cancers (Basel) 2021; 13:cancers13020174. [PMID: 33419058 PMCID: PMC7825408 DOI: 10.3390/cancers13020174] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 12/28/2020] [Accepted: 01/04/2021] [Indexed: 12/21/2022] Open
Abstract
Ankrd2 is a protein known for being mainly expressed in muscle fibers, where it participates in the mechanical stress response. Since both myocytes and osteoblasts are mesenchymal-derived cells, we were interested in examining the role of Ankrd2 in the progression of osteosarcoma which features a mechano-stress component. Although having been identified in many tumor-derived cell lines and -tissues, no study has yet described nor hypothesized any involvement for this protein in osteosarcoma tumorigenesis. In this paper, we report that Ankrd2 is expressed in cell lines obtained from human osteosarcoma and demonstrate a contribution by this protein in the pathogenesis of this insidious disease. Ankrd2 involvement in osteosarcoma development was evaluated in clones of Saos2, U2OS, HOS and MG63 cells stably expressing Ankrd2, through the investigation of hallmark processes of cancer cells. Interestingly, we found that exogenous expression of Ankrd2 influenced cellular growth, migration and clonogenicity in a cell line-dependent manner, whereas it was able to improve the formation of 3D spheroids in three out of four cellular models and enhanced matrix metalloproteinase (MMP) activity in all tested cell lines. Conversely, downregulation of Ankrd2 expression remarkably reduced proliferation and clonogenic potential of parental cells. As a whole, our data present Ankrd2 as a novel player in osteosarcoma development, opening up new therapeutic perspectives.
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Wu ZL, Deng YJ, Zhang GZ, Ren EH, Yuan WH, Xie QQ. Development of a novel immune-related genes prognostic signature for osteosarcoma. Sci Rep 2020; 10:18402. [PMID: 33110201 PMCID: PMC7591524 DOI: 10.1038/s41598-020-75573-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 10/13/2020] [Indexed: 12/14/2022] Open
Abstract
Immune-related genes (IRGs) are responsible for osteosarcoma (OS) initiation and development. We aimed to develop an optimal IRGs-based signature to assess of OS prognosis. Sample gene expression profiles and clinical information were downloaded from the Therapeutically Applicable Research to Generate Effective Treatments (TARGET) and Genotype-Tissue Expression (GTEx) databases. IRGs were obtained from the ImmPort database. R software was used to screen differentially expressed IRGs (DEIRGs) and functional correlation analysis. DEIRGs were analyzed by univariate Cox regression and iterative LASSO Cox regression analysis to develop an optimal prognostic signature, and the signature was further verified by independent cohort (GSE39055) and clinical correlation analysis. The analyses yielded 604 DEIRGs and 10 hub IRGs. A prognostic signature consisting of 13 IRGs was constructed, which strikingly correlated with OS overall survival and distant metastasis (p < 0.05, p < 0.01), and clinical subgroup showed that the signature's prognostic ability was independent of clinicopathological factors. Univariate and multivariate Cox regression analyses also supported its prognostic value. In conclusion, we developed an IRGs signature that is a prognostic indicator in OS patients, and the signature might serve as potential prognostic indicator to identify outcome of OS and facilitate personalized management of the high-risk patients.
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Affiliation(s)
- Zuo-Long Wu
- Guanghe Traditional Chinese and Western Medicine Hospital, Lanzhou, 730000, Gansu, China
- Department of Orthopaedics, Second Hospital of Lanzhou University, Lanzhou, 730000, Gansu, China
| | - Ya-Jun Deng
- Department of Orthopaedics, Second Hospital of Lanzhou University, Lanzhou, 730000, Gansu, China
| | - Guang-Zhi Zhang
- Department of Orthopaedics, Second Hospital of Lanzhou University, Lanzhou, 730000, Gansu, China
| | - En-Hui Ren
- Breast Disease Diagnosis and Treatment Center, Affiliated Hospital of Qinghai University & Affiliated Cancer Hospital of Qinghai University, No.29 Tongren Road, Xining, 810000, Qinghai, China
- Department of Orthopaedics, Second Hospital of Lanzhou University, Lanzhou, 730000, Gansu, China
| | - Wen-Hua Yuan
- Department of Orthopaedics, Second Hospital of Lanzhou University, Lanzhou, 730000, Gansu, China
| | - Qi-Qi Xie
- Breast Disease Diagnosis and Treatment Center, Affiliated Hospital of Qinghai University & Affiliated Cancer Hospital of Qinghai University, No.29 Tongren Road, Xining, 810000, Qinghai, China.
- Department of Orthopaedics, Second Hospital of Lanzhou University, Lanzhou, 730000, Gansu, China.
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Silencing lncRNA ZFAS1 or elevated microRNA-135a represses proliferation, migration, invasion and resistance to apoptosis of osteosarcoma cells. Cancer Cell Int 2019; 19:326. [PMID: 31827400 PMCID: PMC6892223 DOI: 10.1186/s12935-019-1049-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Accepted: 11/25/2019] [Indexed: 02/07/2023] Open
Abstract
Background Osteosarcoma (OS) is still a disease with high mortality from malignant tumors in children and adolescents. Due to its poor treatment, this study explored the involvement of lncRNA ZFAS1/microRNA-135a (miR-135a)/apurinic/apyrimidinic exonuclease 1 (APEX1) axis in the regulation of OS growth and metastasis. Methods ZFAS1, miR-135a and APEX1 expression in OS tissues and cells were tested by RT-qPCR and western blot analysis. MG63 cells were transfected with sh-ZFAS1, miR-135a mimic or their controls to unearth theirs functions in the proliferation, colony formation, migration, invasion, cycle entry and apoptosis of MG63 cells by MTT and EdU, colony formation assays, flow cytometry, and Transwell assay, severally. The proliferation related factor (Ki-67, CyclinD1), apoptosis related factor (Bax, Bcl-2) and migration related factor (MMP2, MMP9) protein levels were tested. Tumor volume and weight were detected by subcutaneous tumor xenograft in nude mice. Results Overexpressed ZFAS1 and APEX1, and down-regulated miR-135a existed in OS tissues and cells. Silenced ZFAS1 or elevated miR-135a inhibited colony formation and proliferation, cycle progression, migration and invasion while promoted apoptosis of MG63 cells. Silenced ZFAS1 or elevated miR-135a suppressed tumor volume and weight of OS in vivo. LncRNA ZFAS1 promoted APEX1 expression by competitively binding with miR-135a. Conclusion This study indicates that silenced ZFAS1 or up-regulated miR-135a restrained migration, proliferation and invasion and promoted apoptosis of OS MG63 cells. This study provides a possible theoretical basis for studying the regulatory mechanism of ZFAS1/miR-135a/APEX1 signaling axis on the growth and metastasis of OS.
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