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Paim LMG, Lopez-Jauregui AA, McAlear TS, Bechstedt S. The spindle protein CKAP2 regulates microtubule dynamics and ensures faithful chromosome segregation. Proc Natl Acad Sci U S A 2024; 121:e2318782121. [PMID: 38381793 PMCID: PMC10907244 DOI: 10.1073/pnas.2318782121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 12/28/2023] [Indexed: 02/23/2024] Open
Abstract
Regulation of microtubule dynamics by microtubule-associated proteins (MAPs) is essential for mitotic spindle assembly and chromosome segregation. Altered microtubule dynamics, particularly increased microtubule growth rates, were found to be a contributing factor for the development of chromosomal instability, which potentiates tumorigenesis. The MAP XMAP215/CKAP5 is the only known microtubule growth factor, and whether other MAPs regulate microtubule growth in cells is unclear. Our recent in vitro reconstitution experiments have demonstrated that Cytoskeleton-Associated Protein 2 (CKAP2) increases microtubule nucleation and growth rates, and here, we find that CKAP2 is also an essential microtubule growth factor in cells. By applying CRISPR-Cas9 knock-in and knock-out (KO) as well as microtubule plus-end tracking live cell imaging, we show that CKAP2 is a mitotic spindle protein that ensures faithful chromosome segregation by regulating microtubule growth. Live cell imaging of endogenously labeled CKAP2 showed that it localizes to the spindle during mitosis and rapidly shifts its localization to the chromatin upon mitotic exit before being degraded. Cells lacking CKAP2 display reduced microtubule growth rates and an increased proportion of chromosome segregation errors and aneuploidy that may be a result of an accumulation of kinetochore-microtubule misattachments. Microtubule growth rates and chromosome segregation fidelity can be rescued upon ectopic CKAP2 expression in KO cells, revealing a direct link between CKAP2 expression and microtubule dynamics. Our results unveil a role of CKAP2 in regulating microtubule growth in cells and provide a mechanistic explanation for the oncogenic potential of CKAP2 misregulation.
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Affiliation(s)
- Lia Mara Gomes Paim
- Department of Anatomy and Cell Biology, McGill University, Montréal, QCH3A 0C7, Canada
| | | | - Thomas S. McAlear
- Department of Anatomy and Cell Biology, McGill University, Montréal, QCH3A 0C7, Canada
| | - Susanne Bechstedt
- Department of Anatomy and Cell Biology, McGill University, Montréal, QCH3A 0C7, Canada
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Li M, Cong R, Yang L, Yang L, Zhang Y, Fu Q. A novel lncRNA LNC_000052 leads to the dysfunction of osteoporotic BMSCs via the miR-96-5p-PIK3R1 axis. Cell Death Dis 2020; 11:795. [PMID: 32968049 PMCID: PMC7511361 DOI: 10.1038/s41419-020-03006-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 09/07/2020] [Accepted: 09/09/2020] [Indexed: 12/11/2022]
Abstract
Bone marrow-derived mesenchymal stem cells (BMSCs) in postmenopausal osteoporosis models exhibit loss of viability and multipotency. Identification of the differentially expressed RNAs in osteoporotic BMSCs could reveal the mechanisms underlying BMSC dysfunction under physiological conditions, which might improve stem cell therapy and tissue regeneration. In this study, we performed high-throughput RNA sequencing and showed that the novel long non-coding RNA (lncRNA) LNC_000052 and its co-expressed mRNA PIK3R1 were upregulated in osteoporotic BMSCs. Knockdown of LNC_000052 could promote BMSC proliferation, migration, osteogenesis, and inhibit apoptosis via the PI3K/Akt signaling pathway. We found that both LNC_000052 and PIK3R1 shared a miRNA target, miR-96-5p, which was downregulated in osteoporotic BMSCs. Their binding sites were confirmed by dual-luciferase assays. Downregulation of miR-96-5p could restrain the effects of LNC_000052 knockdown while upregulation of miR-96-5p together with LNC_000052 knockdown could improve the therapeutic effects of BMSCs. In summary, the LNC_000052-miR-96-5p-PIK3R1 axis led to dysfunction of osteoporotic BMSCs and might be a novel therapeutic target for stem cell therapy and tissue regeneration.
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Affiliation(s)
- Mingyang Li
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Rong Cong
- Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, Shenyang, China
| | - Liyu Yang
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Lei Yang
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Yiqi Zhang
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Qin Fu
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China.
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Ding L, Yang L, He Y, Zhu B, Ren F, Fan X, Wang Y, Li M, Li J, Kuang Y, Liu S, Zhai W, Ma D, Ju Y, Liu Q, Jia B, Sheng J, Chang Z. CREPT/RPRD1B associates with Aurora B to regulate Cyclin B1 expression for accelerating the G2/M transition in gastric cancer. Cell Death Dis 2018; 9:1172. [PMID: 30518842 PMCID: PMC6281615 DOI: 10.1038/s41419-018-1211-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 10/30/2018] [Accepted: 11/07/2018] [Indexed: 11/09/2022]
Abstract
Gastric cancer, like most of other cancers, has an uncontrolled cell cycle regulated by cyclins and cyclin-dependent kinases (CDKs). In this study, we reported that gastric cancer cells showed an accelerated G2/M transition promoted by CREPT/RPRD1B and Aurora kinase B (Aurora B). We found that CREPT/RPRD1B and Aurora B were coordinately expressed during the cell cycle in gastric cancer cells. Deletion of CREPT/RPRD1B disturbed the cell progression and extended the length of cell cycle, leading to a significant accumulation of mitotic cells. Mechanistically, we revealed that CREPT/RPRD1B interacted with Aurora B to regulate the expression of Cyclin B1 in gastric cancer cells. Interestingly, Aurora B phosphorylates S145 in a well-conserved motif of CREPT/RPRD1B. We proposed that phosphorylation of CREPT/RPRD1B by Aurora B is required for promoting the transcription of Cyclin B1, which is critical for the regulation of gastric tumorigenesis. Our study provides a mechanism by which gastric tumor cells maintain their high proliferation rate via coordination of Aurora B and CREPT/RPRD1B on the expression of Cyclin B1. Targeting the interaction of Aurora B and CREPT/RPRD1B might be a strategy for anti-gastric cancer therapy in the future.
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Affiliation(s)
- Lidan Ding
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Liu Yang
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Yuqi He
- Department of Gastroenterology, PLA Army General Hospital, Beijing, 100700, China
| | - Bingtao Zhu
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Fangli Ren
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Xuanzi Fan
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Yinyin Wang
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Mengdi Li
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Jun Li
- Institute of Immunology, PLA, The Third Military Medical University, Chongqing, 400038, China
| | - Yanshen Kuang
- Department of General Surgery/Pathology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Sihan Liu
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Wanli Zhai
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Danhui Ma
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Yanfang Ju
- Department of General Surgery/Pathology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Quentin Liu
- Cancer Center, State Key Lab of Cancer in South China, Sun Yat-sen University, Guangzhou, Guangdong, 510275, China
| | - Baoqing Jia
- Department of General Surgery/Pathology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Jianqiu Sheng
- Department of Gastroenterology, PLA Army General Hospital, Beijing, 100700, China.
| | - Zhijie Chang
- State Key Laboratory of Membrane Biology, School of Medicine, Tsinghua University, Beijing, 100084, China.
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Wang K, Huang R, Li G, Zeng F, Zhao Z, Liu Y, Hu H, Jiang T. CKAP2 expression is associated with glioma tumor growth and acts as a prognostic factor in high‑grade glioma. Oncol Rep 2018; 40:2036-2046. [PMID: 30066946 PMCID: PMC6111633 DOI: 10.3892/or.2018.6611] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 07/23/2018] [Indexed: 01/06/2023] Open
Abstract
Cytoskeletal‑associated protein 2 (CKAP2), which is also known as tumor‑associated microtubule‑associated protein, has been reported to be dysregulated in various types of human cancer. However, the role of CKAP2 in glioma has not been fully elucidated. The present study evaluated the expression pattern of CKAP2 using the Chinese Glioma Genome Atlas microarray database, which included 301 patients, and validated the findings using The Cancer Genome Atlas RNA sequencing database. Kaplan‑Meier survival analysis, and univariate and multivariate Cox analyses, were used to estimate survival distributions. Furthermore, the biological implication of aberrant CKAP2 expression in high‑grade glioma (HGG) was investigated using Gene Ontology analysis, gene set enrichment analysis, gene set variation analysis and STRING. The results indicated that patients with HGG exhibited significantly higher CKAP2 expression levels compared with patients with low‑grade glioma in both databases. Higher expression levels of CKAP2 were significantly associated with shorter overall survival and progression‑free survival of patients with HGG. Furthermore, CKAP2 was also positively correlated with known malignant factors, including high Ki67 expression and phosphatase and tensin homolog mutations. The univariate and multivariate Cox regression analyses demonstrated that CKAP2 may be a novel independent prognostic biomarker for patients with HGG. Functional assays also indicated that CKAP2 was closely associated with the cell cycle, mitosis and cell proliferation. These results suggested that CKAP2 may be associated with tumor growth and could serve as an independent prognostic factor, particularly in patients with HGG.
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Affiliation(s)
- Kuanyu Wang
- Department of Neurosurgery, Beijing Neurosurgical Institute, Capital Medical University, Beijing 100050, P.R. China
- Chinese Glioma Cooperative Group (CGCG), Beijing 100050, P.R. China
| | - Ruoyu Huang
- Department of Neurosurgery, Beijing Neurosurgical Institute, Capital Medical University, Beijing 100050, P.R. China
- Chinese Glioma Cooperative Group (CGCG), Beijing 100050, P.R. China
| | - Guanzhang Li
- Department of Neurosurgery, Beijing Neurosurgical Institute, Capital Medical University, Beijing 100050, P.R. China
- Chinese Glioma Cooperative Group (CGCG), Beijing 100050, P.R. China
| | - Fan Zeng
- Chinese Glioma Cooperative Group (CGCG), Beijing 100050, P.R. China
- Department of Neuropathology, Beijing Neurosurgical Institute, Capital Medical University, Beijing 100050, P.R. China
| | - Zheng Zhao
- Chinese Glioma Cooperative Group (CGCG), Beijing 100050, P.R. China
- Department of Neuropathology, Beijing Neurosurgical Institute, Capital Medical University, Beijing 100050, P.R. China
| | - Yanwei Liu
- Chinese Glioma Cooperative Group (CGCG), Beijing 100050, P.R. China
- Department of Radiotherapy, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China
| | - Huimin Hu
- Chinese Glioma Cooperative Group (CGCG), Beijing 100050, P.R. China
- Department of Neuropathology, Beijing Neurosurgical Institute, Capital Medical University, Beijing 100050, P.R. China
| | - Tao Jiang
- Department of Neurosurgery, Beijing Neurosurgical Institute, Capital Medical University, Beijing 100050, P.R. China
- Chinese Glioma Cooperative Group (CGCG), Beijing 100050, P.R. China
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China
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