1
|
Liu Y, Han T, Miao R, Zhou J, Guo J, Xu Z, Xing Y, Bai Y, Wu J, Hu D. RACGAP1 promotes the progression and poor prognosis of lung adenocarcinoma through its effects on the cell cycle and tumor stemness. BMC Cancer 2024; 24:7. [PMID: 38167018 PMCID: PMC10763365 DOI: 10.1186/s12885-023-11761-x] [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: 07/14/2023] [Accepted: 12/14/2023] [Indexed: 01/05/2024] Open
Abstract
OBJECTION Investigating the key genes and mechanisms that influence stemness in lung adenocarcinoma. METHODS First, consistent clustering analysis was performed on lung adenocarcinoma patients using stemness scoring to classify them. Subsequently, WGCNA was utilized to identify key modules and hub genes. Then, machine learning methods were employed to screen and identify the key genes within these modules. Lastly, functional analysis of the key genes was conducted through cell scratch assays, colony formation assays, transwell migration assays, flow cytometry cell cycle analysis, and xenograft tumor models. RESULTS First, two groups of patients with different stemness scores were obtained, where the high stemness score group exhibited poor prognosis and immunotherapy efficacy. Next, LASSO regression analysis and random forest regression were employed to identify genes (PBK, RACGAP1) associated with high stemness scores. RACGAP1 was significantly upregulated in the high stemness score group of lung adenocarcinoma and closely correlated with clinical pathological features, poor overall survival (OS), recurrence-free survival (RFS), and unfavorable prognosis in lung adenocarcinoma patients. Knockdown of RACGAP1 suppressed the migration, proliferation, and tumor growth of cancer cells. CONCLUSION RACGAP1 not only indicates poor prognosis and limited immunotherapy benefits but also serves as a potential targeted biomarker influencing tumor stemness.
Collapse
Affiliation(s)
- Yafeng Liu
- School of Medicine, Anhui University of Science and Technology, Chongren Building, No 168, Taifeng St, Huainan, 232001, P.R. China
- Anhui Province Engineering Laboratory of Occupational Health and Safety, Anhui University of Science and Technology, Huainan, P.R. China
| | - Tao Han
- School of Medicine, Anhui University of Science and Technology, Chongren Building, No 168, Taifeng St, Huainan, 232001, P.R. China
- Anhui Province Engineering Laboratory of Occupational Health and Safety, Anhui University of Science and Technology, Huainan, P.R. China
| | - Rui Miao
- School of Medicine, Anhui University of Science and Technology, Chongren Building, No 168, Taifeng St, Huainan, 232001, P.R. China
| | - Jiawei Zhou
- School of Medicine, Anhui University of Science and Technology, Chongren Building, No 168, Taifeng St, Huainan, 232001, P.R. China
- Anhui Province Engineering Laboratory of Occupational Health and Safety, Anhui University of Science and Technology, Huainan, P.R. China
| | - Jianqiang Guo
- School of Medicine, Anhui University of Science and Technology, Chongren Building, No 168, Taifeng St, Huainan, 232001, P.R. China
- Anhui Province Engineering Laboratory of Occupational Health and Safety, Anhui University of Science and Technology, Huainan, P.R. China
| | - Zhi Xu
- School of Medicine, Anhui University of Science and Technology, Chongren Building, No 168, Taifeng St, Huainan, 232001, P.R. China
| | - Yingru Xing
- School of Medicine, Anhui University of Science and Technology, Chongren Building, No 168, Taifeng St, Huainan, 232001, P.R. China
- Department of Clinical Laboratory, Anhui Zhongke Gengjiu Hospital, Hefei, P.R. China
| | - Ying Bai
- School of Medicine, Anhui University of Science and Technology, Chongren Building, No 168, Taifeng St, Huainan, 232001, P.R. China.
- Anhui Province Engineering Laboratory of Occupational Health and Safety, Anhui University of Science and Technology, Huainan, P.R. China.
| | - Jing Wu
- School of Medicine, Anhui University of Science and Technology, Chongren Building, No 168, Taifeng St, Huainan, 232001, P.R. China.
- Anhui Province Engineering Laboratory of Occupational Health and Safety, Anhui University of Science and Technology, Huainan, P.R. China.
| | - Dong Hu
- School of Medicine, Anhui University of Science and Technology, Chongren Building, No 168, Taifeng St, Huainan, 232001, P.R. China.
- Anhui Province Engineering Laboratory of Occupational Health and Safety, Anhui University of Science and Technology, Huainan, P.R. China.
- Key Laboratory of Industrial Dust Prevention and Control & Occupational Safety and Health of the Ministry of Education, Anhui University of Science and Technology, Huainan, P.R. China.
| |
Collapse
|
2
|
Varzideh F, Gambardella J, Kansakar U, Jankauskas SS, Santulli G. Molecular Mechanisms Underlying Pluripotency and Self-Renewal of Embryonic Stem Cells. Int J Mol Sci 2023; 24:ijms24098386. [PMID: 37176093 PMCID: PMC10179698 DOI: 10.3390/ijms24098386] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 04/29/2023] [Accepted: 05/02/2023] [Indexed: 05/15/2023] Open
Abstract
Embryonic stem cells (ESCs) are derived from the inner cell mass (ICM) of the blastocyst. ESCs have two distinctive properties: ability to proliferate indefinitely, a feature referred as "self-renewal", and to differentiate into different cell types, a peculiar characteristic known as "pluripotency". Self-renewal and pluripotency of ESCs are finely orchestrated by precise external and internal networks including epigenetic modifications, transcription factors, signaling pathways, and histone modifications. In this systematic review, we examine the main molecular mechanisms that sustain self-renewal and pluripotency in both murine and human ESCs. Moreover, we discuss the latest literature on human naïve pluripotency.
Collapse
Affiliation(s)
- Fahimeh Varzideh
- Department of Medicine (Division of Cardiology), Wilf Family Cardiovascular Research Institute, Einstein Institute for Aging Research, Institute for Neuroimmunology and Inflammation (INI), Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Jessica Gambardella
- Department of Molecular Pharmacology, Einstein-Mount Sinai Diabetes Research Center (ES-DRC), Fleischer Institute for Diabetes and Metabolism (FIDAM), Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Urna Kansakar
- Department of Medicine (Division of Cardiology), Wilf Family Cardiovascular Research Institute, Einstein Institute for Aging Research, Institute for Neuroimmunology and Inflammation (INI), Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Stanislovas S Jankauskas
- Department of Medicine (Division of Cardiology), Wilf Family Cardiovascular Research Institute, Einstein Institute for Aging Research, Institute for Neuroimmunology and Inflammation (INI), Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Gaetano Santulli
- Department of Medicine (Division of Cardiology), Wilf Family Cardiovascular Research Institute, Einstein Institute for Aging Research, Institute for Neuroimmunology and Inflammation (INI), Albert Einstein College of Medicine, New York, NY 10461, USA
- Department of Molecular Pharmacology, Einstein-Mount Sinai Diabetes Research Center (ES-DRC), Fleischer Institute for Diabetes and Metabolism (FIDAM), Albert Einstein College of Medicine, New York, NY 10461, USA
| |
Collapse
|
3
|
CDK1 promotes the stemness of lung cancer cells through interacting with Sox2. Clin Transl Oncol 2021; 23:1743-1751. [PMID: 33721187 DOI: 10.1007/s12094-021-02575-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 02/15/2021] [Indexed: 12/17/2022]
Abstract
OBJECTIVES The promoting roles of cyclin dependent kinase 1 (CDK1) have been revealed in various tumors, however, its effects in the progression of cancer stem cells are still confusing. This work aims to explore the roles of CDK1 in regulating the stemness of lung cancer cells. METHODS Online dataset analysis was performed to evaluate the correlation between CDK1 exression and the survival of lung cancer patients. RT-qPCR, western blot, cell viability, sphere-formation analysis and ALDH activity detection were used to investigate the roles of CDK1 on lung cancer cell stemness, viability and chemotherapeutic sensitivity. Immunocoprecipitation (Co-IP) analysis and rescuing experiments were performed to reveal the underlying mechanisms contributing to CDK1-mediated effects on lung cancer cell stemness. RESULTS CDK1 mRNA expression was negatively correlated with the overall survival of lung cancer patients and remarkably increased in tumor spheres formed by lung cancer cells compared to the parental cells. Additionally, CDK1 positively regulated the stemness of lung cancer cells. Mechanistically, CDK1 could interact with Sox2 protein, but not other stemness markers (Oct4, Nanog and CD133). Furthermore, CDK1 increased the phosphorylation, cytoplasm-nuclear translocation and transcriptional activity of Sox2 protein in lung cancer cells. Moreover, CDK1 positively regulated the stemness of lung cancer cells in a Sox2-dependent manner. Finally, we revealed that inhibition of CDK1 enhanced the chemotherapeutic sensitivity, which was also rescued by Sox2 overexpression. CONCLUSIONS This work reveals a novel CDK1/Sox2 axis responsible for maintaining the stemness of lung cancer cells.
Collapse
|
4
|
Padgett J, Santos SDM. From clocks to dominoes: lessons on cell cycle remodelling from embryonic stem cells. FEBS Lett 2020; 594:2031-2045. [PMID: 32535913 DOI: 10.1002/1873-3468.13862] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 05/01/2020] [Accepted: 05/27/2020] [Indexed: 12/21/2022]
Abstract
Cell division is a fundamental cellular process and the evolutionarily conserved networks that control cell division cycles adapt during development, tissue regeneration, cell de-differentiation and reprogramming, and a variety of pathological conditions. Embryonic development is a prime example of such versatility: fast, clock-like divisions hallmarking embryonic cells at early developmental stages become slower and controlled during cellular differentiation and lineage specification. In this review, we compare and contrast the unique cell cycle of mouse and human embryonic stem cells with that of early embryonic cells and of differentiated cells. We propose that embryonic stem cells provide an extraordinarily useful model system to understand cell cycle remodelling during embryonic-to-somatic transitions. We discuss how cell cycle networks help sustain embryonic stem cell pluripotency and self-renewal and how they safeguard cell identity and proper cell number in differentiated cells. Finally, we highlight the incredible diversity in cell cycle regulation within mammals and discuss the implications of studying cell cycle remodelling for understanding healthy and disease states.
Collapse
Affiliation(s)
- Joe Padgett
- Quantitative Cell Biology Lab, The Francis Crick Institute, London, UK
| | - Silvia D M Santos
- Quantitative Cell Biology Lab, The Francis Crick Institute, London, UK
| |
Collapse
|
5
|
Li A, Wang F, Li L, Fan LH, Meng TG, Li QN, Wang Y, Yue W, Wang HX, Shi YP, Li HX, Schatten H, Sun QY, Guo XP. Mechanistic insights into the reduced developmental capacity of in vitro matured oocytes and importance of cumulus cells in oocyte quality determination. J Cell Physiol 2020; 235:9743-9751. [PMID: 32415704 DOI: 10.1002/jcp.29786] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 04/12/2020] [Accepted: 04/29/2020] [Indexed: 12/17/2022]
Abstract
In vitro maturation of oocytes is a promising assisted reproductive technology (ART) for infertility treatment, although it is still not a routine technique for human ART due to reduced embryonic development. The aim of the present study was to clarify the possible reasons for reduced capacity of in vitro matured oocytes. Our results showed that the oocytes matured in vitro displayed increased abnormal mitochondrial distribution, reduced mitochondrial membrane potential, and increased reactive oxygen species levels when compared to in vivo matured oocytes. These results were not different in oocytes matured in vitro with or without cumulus cells. Notably, in vitro matured oocytes displayed increased mitochondrial DNA numbers probably due to functional compensation. In vitro matured oocytes showed significantly lower activation and embryonic development rates, and their ability to produce Ca2+ oscillations was much lower in response to parthenogenetic activation, especially in oocytes matured in vitro without cumulus cells with nearly half of them failing to produce calcium waves upon strontium chloride stimulation. These data are important for understanding the reasons for reduced developmental potential of in vitro matured oocytes and the importance of cumulus cells for oocyte quality.
Collapse
Affiliation(s)
- Ang Li
- Faculty of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, China.,Shanxi Province Reproductive Science Institute, Taiyuan, China.,State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Feng Wang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Li Li
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Li-Hua Fan
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Tie-Gang Meng
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Qian-Nan Li
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Yue Wang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Wei Yue
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Huai-Xiu Wang
- Shanxi Province Reproductive Science Institute, Taiyuan, China
| | - Ya-Ping Shi
- Shanxi Province Reproductive Science Institute, Taiyuan, China
| | - Hong-Xia Li
- Shanxi Province Reproductive Science Institute, Taiyuan, China
| | - Heide Schatten
- Department of Veterinary Pathobiology, University of Missouri, Columbia, Missouri
| | - Qing-Yuan Sun
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Xing-Ping Guo
- Faculty of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, China.,Shanxi Province Reproductive Science Institute, Taiyuan, China
| |
Collapse
|
6
|
The cell cycle in stem cell proliferation, pluripotency and differentiation. Nat Cell Biol 2019; 21:1060-1067. [PMID: 31481793 DOI: 10.1038/s41556-019-0384-4] [Citation(s) in RCA: 180] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 07/24/2019] [Indexed: 12/30/2022]
Abstract
Cyclins, cyclin-dependent kinases and other components of the core cell cycle machinery drive cell division. Growing evidence indicates that this machinery operates in a distinct fashion in some mammalian stem cell types, such as pluripotent embryonic stem cells. In this Review, we discuss our current knowledge of how cell cycle proteins mechanistically link cell proliferation, pluripotency and cell fate specification. We focus on embryonic stem cells, induced pluripotent stem cells and embryonic neural stem/progenitor cells.
Collapse
|
7
|
Kim HJ, Shin J, Lee S, Kim TW, Jang H, Suh MY, Kim JH, Hwang IY, Hwang DS, Cho EJ, Youn HD. Cyclin-dependent kinase 1 activity coordinates the chromatin associated state of Oct4 during cell cycle in embryonic stem cells. Nucleic Acids Res 2019; 46:6544-6560. [PMID: 29901724 PMCID: PMC6061841 DOI: 10.1093/nar/gky371] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 04/30/2018] [Indexed: 11/23/2022] Open
Abstract
Cyclin-dependent kinase 1 (Cdk1) is indispensable for embryonic stem cell (ESC) maintenance and embryo development. Even though some reports have described a connection between Cdk1 and Oct4, there is no evidence that Cdk1 activity is directly linked to the ESC pluripotency transcription program. We recently reported that Aurkb/PP1-mediated Oct4 resetting is important to cell cycle maintenance and pluripotency in mouse ESCs (mESCs). In this study, we show that Cdk1 is an upstream regulator of the Oct4 phosphorylation state during cell cycle progression, and it coordinates the chromatin associated state of Oct4 for pluripotency-related gene expression within the cell cycle. Upon entry into mitosis, Aurkb in the chromosome passenger complex becomes fully activated and PP1 activity is inhibited downstream of Cdk1 activation, leading to sustaining Oct4(S229) phosphorylation and dissociation of Oct4 from chromatin during the mitotic phase. Cdk1 inhibition at the mitotic phase abnormally results in Oct4 dephosphorylation, chromosome decondensation and chromatin association of Oct4, even in replicated chromosome. Our study results suggest a molecular mechanism by which Cdk1 directly links the cell cycle to the pluripotency transcription program in mESCs.
Collapse
Affiliation(s)
- Hye Ji Kim
- National Creative Research Center for Epigenome Reprogramming Network, Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Republic of Korea.,Department of Biological Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Jihoon Shin
- National Creative Research Center for Epigenome Reprogramming Network, Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Republic of Korea
| | - Sangho Lee
- Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 03080, Republic of Korea
| | - Tae Wan Kim
- National Creative Research Center for Epigenome Reprogramming Network, Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Republic of Korea
| | - Hyonchol Jang
- Division of Cancer Biology, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea
| | - Min Young Suh
- Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 03080, Republic of Korea
| | - Jae-Hwan Kim
- National Creative Research Center for Epigenome Reprogramming Network, Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Republic of Korea.,Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul 03080, Republic of Korea
| | - In-Young Hwang
- National Creative Research Center for Epigenome Reprogramming Network, Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Republic of Korea
| | - Deog Su Hwang
- Department of Biological Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Eun-Jung Cho
- College of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hong-Duk Youn
- National Creative Research Center for Epigenome Reprogramming Network, Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Republic of Korea.,Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 03080, Republic of Korea.,Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul 03080, Republic of Korea
| |
Collapse
|
8
|
Diao J, Zhang C, Zhang D, Wang X, Zhang J, Ma C, Deng K, Jiang T, Jia W, Xu T. Role and mechanisms of a three-dimensional bioprinted microtissue model in promoting proliferation and invasion of growth-hormone-secreting pituitary adenoma cells. Biofabrication 2019; 11:025006. [PMID: 30537696 DOI: 10.1088/1758-5090/aaf7ea] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Growth-hormone-secreting pituitary adenoma (GHSPA) is a benign tumour with a high incidence and large economic burden, which greatly affects quality of life. The aetiological factors are yet to be clarified for GHSPA. Conventional two-dimensional (2D) monolayer culture of tumour cells cannot ideally reflect the growth status of tumours in the physiological environment, and insufficiencies of in vitro models have severely restricted the progress of cancer research. Three-dimensional (3D) bioprinting technology is being increasingly used in various fields of biology and medicine, which allows recapitulation of the in vivo growth environment of tumour cells. In this study, a GHSPA microtissue model was established using 3D bioprinting. Tumour cells in the 3D environment exhibited more active cell cycle progression, secretion, proliferation, invasion, and tumourigenesis compared with those in the 2D environment. Furthermore, the molecular mechanisms of the 3D-printed microtissue model were explored. We demonstrated that the 3D-printed microtissue provides an excellent in vitro model at the tissue level for oncological research and may facilitate in-depth studies on the aetiology, treatment, drug resistance, and long-term prognosis of GHSPA .
Collapse
Affiliation(s)
- Jinfu Diao
- Neurosurgical Department, Beijing Tiantan Hospital, Capital Medical University, 6 Tiantan Xili, Dongcheng District, Beijing 100050, People's Republic of China. Beijing Neurosurgical Institute, Capital Medical University, 6 Tiantan Xili, Dongcheng District, Beijing 100050, People's Republic of China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Takahashi A, Mulati M, Saito M, Numata H, Kobayashi Y, Ochi H, Sato S, Kaldis P, Okawa A, Inose H. Loss of cyclin-dependent kinase 1 impairs bone formation, but does not affect the bone-anabolic effects of parathyroid hormone. J Biol Chem 2018; 293:19387-19399. [PMID: 30366983 DOI: 10.1074/jbc.ra118.004834] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 10/02/2018] [Indexed: 12/31/2022] Open
Abstract
Bone mass is maintained by a balance between osteoblast-mediated bone formation and osteoclast-mediated bone resorption. Although recent genetic studies have uncovered various mechanisms that regulate osteoblast differentiation, the molecular basis of osteoblast proliferation remains unclear. Here, using an osteoblast-specific loss-of-function mouse model, we demonstrate that cyclin-dependent kinase 1 (Cdk1) regulates osteoblast proliferation and differentiation. Quantitative RT-PCR analyses revealed that Cdk1 is highly expressed in bone and is down-regulated upon osteoblast differentiation. We also noted that Cdk1 is dispensable for the bone-anabolic effects of parathyroid hormone (PTH). Cdk1 deletion in osteoblasts led to osteoporosis in adult mice due to low bone formation, but did not affect osteoclast formation in vivo Cdk1 overexpression in osteoblasts promoted proliferation, and conversely, Cdk1 knockdown inhibited osteoblast proliferation and promoted differentiation. Of note, we provide direct evidence that PTH's bone-anabolic effects occur without enhancing osteoblast proliferation in vivo Furthermore, we found that Cdk1 expression in osteoblasts is essential for bone fracture repair. These findings may help reduce the risk of nonunion after bone fracture and identify patients at higher risk for nonresponse to PTH treatment. Collectively, our results indicate that Cdk1 is essential for osteoblast proliferation and that it functions as a molecular switch that shifts osteoblast proliferation to maturation. We therefore conclude that Cdk1 plays an important role in bone formation.
Collapse
Affiliation(s)
- Akira Takahashi
- From the Department of Orthopedics, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
| | - Mieradili Mulati
- From the Department of Orthopedics, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
| | - Masanori Saito
- From the Department of Orthopedics, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
| | - Hoashi Numata
- From the Department of Orthopedics, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
| | - Yutaka Kobayashi
- From the Department of Orthopedics, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
| | - Hiroki Ochi
- the Department of Physiology and Cell Biology, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
| | - Shingo Sato
- the Department of Physiology and Cell Biology, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
| | - Philipp Kaldis
- the Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology, and Research (A*STAR), Singapore 138673, Republic of Singapore, and.,the Department of Biochemistry, National University of Singapore (NUS), Singapore 117597, Republic of Singapore
| | - Atsushi Okawa
- From the Department of Orthopedics, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
| | - Hiroyuki Inose
- From the Department of Orthopedics, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan,
| |
Collapse
|
10
|
Ravindran Menon D, Luo Y, Arcaroli JJ, Liu S, KrishnanKutty LN, Osborne DG, Li Y, Samson JM, Bagby S, Tan AC, Robinson WA, Messersmith WA, Fujita M. CDK1 Interacts with Sox2 and Promotes Tumor Initiation in Human Melanoma. Cancer Res 2018; 78:6561-6574. [PMID: 30297536 DOI: 10.1158/0008-5472.can-18-0330] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 07/16/2018] [Accepted: 09/25/2018] [Indexed: 01/09/2023]
Abstract
: Cancers are composed of heterogeneous subpopulations with various tumor-initiating capacities, yet key stem cell genes associated with enhanced tumor-initiating capacities and their regulatory mechanisms remain elusive. Here, we analyzed patient-derived xenografts from melanoma, colon, and pancreatic cancer tissues and identified enrichment of tumor-initiating cells in MHC class I-hi cells, where CDK1, a master regulator of the cell cycle, was upregulated. Overexpression of CDK1, but not its kinase-dead variant, in melanoma cells increased their spheroid forming ability, tumorigenic potential, and tumor-initiating capacity; inhibition of CDK1 with pharmacologic agents reduced these characteristics, which was unexplained by the role of CDK1 in regulating the cell cycle. Proteomic analysis revealed an interaction between CDK1 and the pluripotent stem cell transcription factor Sox2. Blockade or knockdown of CDK1 resulted in reduced phosphorylation, nuclear localization, and transcriptional activity of Sox2. Knockout of Sox2 in CDK1-overexpressing cells reduced CDK1-driven tumor-initiating capacity substantially. Furthermore, GSEA analysis of CDK1hi tumor cells identified a pathway signature common in all three cancer types, including E2F, G2M, MYC, and spermatogenesis, confirming a stem-like nature of CDK1hi tumor cells. These findings reveal a previously unrecognized role for CDK1 in regulating tumor-initiating capacity in melanoma and suggest a novel treatment strategy in cancer via interruption of CDK1 function and its protein-protein interactions. SIGNIFICANCE: These findings uncover CDK1 as a new regulator of Sox2 during tumor initiation and implicate the CDK1-Sox2 interaction as a potential therapeutic target in cancer.
Collapse
Affiliation(s)
| | - Yuchun Luo
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado
| | - John J Arcaroli
- Department of Medicine, University of Colorado Denver, Aurora, Colorado
| | - Sucai Liu
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado
| | | | - Douglas G Osborne
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado
| | - Yang Li
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado
| | - Jenny Mae Samson
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado
| | - Stacey Bagby
- Department of Medicine, University of Colorado Denver, Aurora, Colorado
| | - Aik-Choon Tan
- Department of Medicine, University of Colorado Denver, Aurora, Colorado
| | | | | | - Mayumi Fujita
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado. .,Denver VA Medical Center, Denver, Colorado.,Department of Immunology & Microbiology, University of Colorado Denver, Aurora, Colorado
| |
Collapse
|
11
|
Zaveri L, Dhawan J. Cycling to Meet Fate: Connecting Pluripotency to the Cell Cycle. Front Cell Dev Biol 2018; 6:57. [PMID: 29974052 PMCID: PMC6020794 DOI: 10.3389/fcell.2018.00057] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Accepted: 05/14/2018] [Indexed: 01/26/2023] Open
Abstract
Pluripotent stem cells are characterized by their high proliferative rates, their ability to self-renew and their potential to differentiate to all the three germ layers. This rapid proliferation is brought about by a highly modified cell cycle that allows the cells to quickly shuttle from DNA synthesis to cell division, by reducing the time spent in the intervening gap phases. Many key regulators that define the somatic cell cycle are either absent or exhibit altered behavior, allowing the pluripotent cell to bypass cell cycle checkpoints typical of somatic cells. Experimental analysis of this modified stem cell cycle has been challenging due to the strong link between rapid proliferation and pluripotency, since perturbations to the cell cycle or pluripotency factors result in differentiation. Despite these hurdles, our understanding of this unique cell cycle has greatly improved over the past decade, in part because of the availability of new technologies that permit the analysis of single cells in heterogeneous populations. This review aims to highlight some of the recent discoveries in this area with a special emphasis on different states of pluripotency. We also discuss the highly interlinked network that connects pluripotency factors and key cell cycle genes and review evidence for how this interdependency may promote the rapid cell cycle. This issue gains translational importance since disruptions in stem cell proliferation and differentiation can impact disorders at opposite ends of a spectrum, from cancer to degenerative disease.
Collapse
Affiliation(s)
- Lamuk Zaveri
- Institute for Stem Cell Biology and Regenerative Medicine, Bangalore, India.,CSIR - Centre for Cellular and Molecular Biology, Hyderabad, India.,Manipal Academy of Higher Education, Manipal, India
| | - Jyotsna Dhawan
- Institute for Stem Cell Biology and Regenerative Medicine, Bangalore, India.,CSIR - Centre for Cellular and Molecular Biology, Hyderabad, India
| |
Collapse
|
12
|
Lin R, Wang Y, Ji K, Liu Z, Xiao S, Zhou D, Chen Q, Shi B. Bioinformatics analysis to screen key genes implicated in the differentiation of induced pluripotent stem cells to hepatocytes. Mol Med Rep 2018; 17:4351-4359. [PMID: 29328449 PMCID: PMC5802208 DOI: 10.3892/mmr.2018.8385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 01/27/2017] [Indexed: 12/11/2022] Open
Abstract
Due to the lack of potential organs, hepatocellular transplantation has been considered for treating end-stage liver disease. Induced pluripotent stem cells (iPSCs) are reverted from somatic cells and are able to differentiate into hepatocytes. The present study aimed to investigate the mechanisms underlying iPSC differentiation to hepatocytes. GSE66076 was downloaded from the Gene Expression Omnibus; this database includes data from 3 undifferentiated (T0), 3 definitive endoderm (T5), and 3 early hepatocyte (T24) samples across hepatic‑directed differentiation of iPSCs. Differentially expressed genes (DEGs) between T0 and T5 or T24 samples were identified using the linear models for microarray data package in Bioconductor, and enrichment analyses were performed. Using the weighted correlation network analysis package in R, clusters were identified for the merged DEGs. Cytoscape was used to construct protein‑protein interaction (PPI) networks for DEGs identified to belong to significant clusters. Using the ReactomeFI plugin in Cytoscape, functional interaction (FI) networks were constructed for the common genes. A total of 433 and 1,342 DEGs were identified in the T5 and T24 samples respectively, compared with the T0 samples. Blue and turquoise clusters were identified as significant gene clusters. In the PPI network for DEGs in the blue cluster, the key node fibroblast growth factor 2 (FGF2) could interact with bone morphogenetic protein 2 (BMP2). Cyclin‑dependent kinase 1 (CDK1) was demonstrated to have the highest degree (degree=71) in the PPI network for DEGs in the turquoise cluster. Enrichment analysis for the common genes, including hepatocyte nuclear factor 4α (HNF4A) and epidermal growth factor (EGF), in the FI network indicated that EGF and FGF2 were enriched in the Ras and Rap1 signaling pathways. The present results suggest that FGF2, BMP2, CDK1, HNF4A and EGF may participate in the differentiation of iPSCs into hepatocytes.
Collapse
Affiliation(s)
- Rui Lin
- Department of General Surgery, Tongji Hospital, School of Medicine, Tongji University Medical School, Shanghai 200065, P.R. China
| | - Yufeng Wang
- Department of General Surgery, Tongji Hospital, School of Medicine, Tongji University Medical School, Shanghai 200065, P.R. China
| | - Kun Ji
- Department of General Surgery, Tongji Hospital, School of Medicine, Tongji University Medical School, Shanghai 200065, P.R. China
| | - Zhongyan Liu
- Department of General Surgery, Tongji Hospital, School of Medicine, Tongji University Medical School, Shanghai 200065, P.R. China
| | - Shuai Xiao
- Department of General Surgery, Tongji Hospital, School of Medicine, Tongji University Medical School, Shanghai 200065, P.R. China
| | - Dehua Zhou
- Department of General Surgery, Tongji Hospital, School of Medicine, Tongji University Medical School, Shanghai 200065, P.R. China
| | - Quanning Chen
- Department of General Surgery, Tongji Hospital, School of Medicine, Tongji University Medical School, Shanghai 200065, P.R. China
| | - Baomin Shi
- Department of General Surgery, Tongji Hospital, School of Medicine, Tongji University Medical School, Shanghai 200065, P.R. China
| |
Collapse
|
13
|
Protein Kinases in Pluripotency—Beyond the Usual Suspects. J Mol Biol 2017; 429:1504-1520. [DOI: 10.1016/j.jmb.2017.04.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 04/21/2017] [Accepted: 04/21/2017] [Indexed: 12/14/2022]
|
14
|
Wang XQ, Lo CM, Chen L, Ngan ESW, Xu A, Poon RY. CDK1-PDK1-PI3K/Akt signaling pathway regulates embryonic and induced pluripotency. Cell Death Differ 2016; 24:38-48. [PMID: 27636107 PMCID: PMC5260505 DOI: 10.1038/cdd.2016.84] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 07/18/2016] [Accepted: 07/19/2016] [Indexed: 02/08/2023] Open
Abstract
The mechanisms of how signaling pathways are coordinated and integrated for the
maintenance of the self-renewal of human embryonic stem cells (hESCs) and the
acquisition of pluripotency in reprogramming are still only partly understood.
CDK1 is a key regulator of mitosis. Recently, CDK1 has been shown to be involved
in regulating self-renewal of stem cells, even though the mechanistic role of
how CDK1 regulates pluripotency is unknown. In this report, we aim to understand
how CDK1 can control pluripotency by reducing CDK1 activity to a level that has
no effect on cell cycle progression. We demonstrated that high levels of CDK1 is
associated with the pluripotency stage of hESCs; and decreased CDK1 activity to
a level without perturbing the cell cycle is sufficient to induce
differentiation. CDK1 specifically targets the phosphorylation of PDK1 and
consequently the activity of PI3K/Akt and its effectors ERK and
GSK3β. Evidence of the reversion of inactive CDK1-mediated
differentiation by the inhibition of Akt signaling effectors suggests that the
CDK1-PDK1-PI3K/Akt kinase cascade is a functional signaling pathway for the
pluripotency of hESCs. Moreover, cyclin B1-CDK1 complexes promote somatic
reprogramming efficiency, probably by regulating the maturation of induced
pluripotent stem cells (iPSCs), as cyclin B1 stimulates a higher cellular level
of LIN28A, suggesting that monitoring iPSC factors could be a new path for the
enhancement of reprogramming efficiency. Together, we demonstrate an essential
role for the CDK1-PDK1-PI3K/Akt kinase signaling pathway in the regulation
of self-renewal, differentiation, and somatic reprogramming, which provides a
novel kinase cascade mechanism for pluripotency control and acquisition.
Collapse
Affiliation(s)
- Xiao Qi Wang
- Department of Surgery, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China
| | - Chung Mau Lo
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - Lin Chen
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - Elly S-W Ngan
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - Aimin Xu
- Department of Medicine, The University of Hong Kong, Hong Kong, China
| | - Randy Yc Poon
- Division of Life Science, Center for Cancer Research, and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong, China
| |
Collapse
|
15
|
Ko CI, Fan Y, de Gannes M, Wang Q, Xia Y, Puga A. Repression of the Aryl Hydrocarbon Receptor Is Required to Maintain Mitotic Progression and Prevent Loss of Pluripotency of Embryonic Stem Cells. Stem Cells 2016; 34:2825-2839. [DOI: 10.1002/stem.2456] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 06/20/2016] [Accepted: 06/21/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Chia-I Ko
- Department of Environmental Health and Center for Environmental Genetics; University of Cincinnati College of Medicine; Cincinnati Ohio USA
| | - Yunxia Fan
- Department of Environmental Health and Center for Environmental Genetics; University of Cincinnati College of Medicine; Cincinnati Ohio USA
| | - Matthew de Gannes
- Department of Environmental Health and Center for Environmental Genetics; University of Cincinnati College of Medicine; Cincinnati Ohio USA
| | - Qin Wang
- Department of Environmental Health and Center for Environmental Genetics; University of Cincinnati College of Medicine; Cincinnati Ohio USA
| | - Ying Xia
- Department of Environmental Health and Center for Environmental Genetics; University of Cincinnati College of Medicine; Cincinnati Ohio USA
| | - Alvaro Puga
- Department of Environmental Health and Center for Environmental Genetics; University of Cincinnati College of Medicine; Cincinnati Ohio USA
| |
Collapse
|
16
|
Recurrent Glioblastomas Reveal Molecular Subtypes Associated with Mechanistic Implications of Drug-Resistance. PLoS One 2015; 10:e0140528. [PMID: 26466313 PMCID: PMC4605710 DOI: 10.1371/journal.pone.0140528] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 09/28/2015] [Indexed: 01/04/2023] Open
Abstract
Previously, transcriptomic profiling studies have shown distinct molecular subtypes of glioblastomas. It has also been suggested that the recurrence of glioblastomas could be achieved by transcriptomic reprograming of tumors, however, their characteristics are not yet fully understood. Here, to gain the mechanistic insights on the molecular phenotypes of recurrent glioblastomas, gene expression profiling was performed on the 43 cases of glioblastomas including 15 paired primary and recurrent cases. Unsupervised clustering analyses revealed two subtypes of G1 and G2, which were characterized by proliferation and neuron-like gene expression traits, respectively. While the primary tumors were classified as G1 subtype, the recurrent glioblastomas showed two distinct expression types. Compared to paired primary tumors, the recurrent tumors in G1 subtype did not show expression alteration. By contrast, the recurrent tumors in G2 subtype showed expression changes from proliferation type to neuron-like one. We also observed the expression of stemness-related genes in G1 recurrent tumors and the altered expression of DNA-repair genes (i.e., AURK, HOX, MGMT, and MSH6) in the G2 recurrent tumors, which might be responsible for the acquisition of drug resistance mechanism during tumor recurrence in a subtype-specific manner. We suggest that recurrent glioblastomas may choose two different strategies for transcriptomic reprograming to escape the chemotherapeutic treatment during tumor recurrence. Our results might be helpful to determine personalized therapeutic strategy against heterogeneous glioma recurrence.
Collapse
|
17
|
Ouyang J, Yu W, Liu J, Zhang N, Florens L, Chen J, Liu H, Washburn M, Pei D, Xie T. Cyclin-dependent kinase-mediated Sox2 phosphorylation enhances the ability of Sox2 to establish the pluripotent state. J Biol Chem 2015; 290:22782-94. [PMID: 26139602 DOI: 10.1074/jbc.m115.658195] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Indexed: 11/06/2022] Open
Abstract
Sox2 is a key factor in maintaining self-renewal of embryonic stem cells (ESCs) and adult stem cells as well as in reprogramming differentiated cells back into pluripotent or multipotent stem cells. Although previous studies have shown that Sox2 is phosphorylated in human ESCs, the biological significance of Sox2 phosphorylation in ESC maintenance and reprogramming has not been well understood. In this study we have identified new phosphorylation sites on Sox2 and have further demonstrated that Cdk2-mediated Sox2 phosphorylation at Ser-39 and Ser-253 is required for establishing the pluripotent state during reprogramming but is dispensable for ESC maintenance. Mass spectrometry analysis of purified Sox2 protein has identified new phosphorylation sites on two tyrosine and six serine/Threonine residues. Cdk2 physically interacts with Sox2 and phosphorylates Sox2 at Ser-39 and Ser-253 in vitro. Surprisingly, Sox2 phosphorylation at Ser-39 and Ser-253 is dispensable for ESC self-renewal and cell cycle progression. In addition, Sox2 phosphorylation enhances its ability to establish the pluripotent state during reprogramming by working with Oct4 and Klf4. Finally, Cdk2 can also modulate the ability of Oct4, Sox2, and Klf4 in reprogramming fibroblasts back into pluripotent stem cells. Therefore, this study has for the first time demonstrated that Sox2 phosphorylation by Cdk2 promotes the establishment but not the maintenance of the pluripotent state. It might also help explain why the inactivation of CDK inhibitors such as p53, p21, and Arf/Ink4 promotes the induction of pluripotent stem cells.
Collapse
Affiliation(s)
- Juan Ouyang
- From the Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China, Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530 Guangzhou, China
| | - Wei Yu
- Stowers Institute for Medical Research, Kansas City, Missouri 64110
| | - Jing Liu
- Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530 Guangzhou, China
| | - Nian Zhang
- Stowers Institute for Medical Research, Kansas City, Missouri 64110
| | - Laurence Florens
- Stowers Institute for Medical Research, Kansas City, Missouri 64110
| | - Jiekai Chen
- Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530 Guangzhou, China
| | - He Liu
- Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530 Guangzhou, China
| | - Michael Washburn
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, Department of Pathology and Laboratory Medicine, The University of Kansas Medical Center, Kansas City, Kansas 66160, and
| | - Duanqing Pei
- Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530 Guangzhou, China,
| | - Ting Xie
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, Department of Anatomy and Cell Biology, University of Kansas School of Medicine, Kansas City, Kansas 66160
| |
Collapse
|
18
|
Neganova I, Tilgner K, Buskin A, Paraskevopoulou I, Atkinson SP, Peberdy D, Passos JF, Lako M. CDK1 plays an important role in the maintenance of pluripotency and genomic stability in human pluripotent stem cells. Cell Death Dis 2014; 5:e1508. [PMID: 25375373 PMCID: PMC4260724 DOI: 10.1038/cddis.2014.464] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 09/16/2014] [Accepted: 09/24/2014] [Indexed: 12/12/2022]
Abstract
Human embryonic stem cells (hESC) and induced pluripotent stem cells (hiPSC) are characterised by an unusual and tightly regulated cell cycle that has been shown to be important for the maintenance of a pluripotent phenotype. Cyclin-dependant kinase 1 (CDK1) is a key player in cell cycle regulation and particularly mitosis; however, its role has not been studied previously in hESC and hiPSC. To investigate the impacts of CDK1 downregulation, we performed RNA interference studies which in addition to expected mitotic deficiencies revealed a large range of additional phenotypes related to maintenance of pluripotency, ability to repair double strand breaks (DSBs) and commitment to apoptosis. Downregulation of CDK1 led to the loss of typical pluripotent stem cell morphology, downregulation of pluripotency markers and upregulation of a large number of differentiation markers. In addition, human pluripotent stem cells with reduced CDK1 expression accumulated a higher number of DSBs were unable to activate CHK2 expression and could not maintain G2/M arrest upon exposure to ionising radiation. CDK1 downregulation led to the accumulation of cells with abnormal numbers of mitotic organelles, multiple chromosomal abnormalities and polyploidy. Furthermore, such cells demonstrated an inability to execute apoptosis under normal culture conditions, despite a significant increase in the expression of active PARP1, resulting in tolerance and very likely further propagation of genomic instabilities and ensuing of differentiation process. On the contrary, apoptosis but not differentiation, was the preferred route for such cells when they were subjected to ionising radiation. Together these data suggest that CDK1 regulates multiple events in human pluripotent stem cells ranging from regulation of mitosis, G2/M checkpoint maintenance, execution of apoptosis, maintenance of pluripotency and genomic stability.
Collapse
Affiliation(s)
- I Neganova
- Institute of Genetic Medicine, Newcastle University, International Centre for Life, Newcastle upon Tyne NE1 3BZ, UK
| | - K Tilgner
- Institute of Genetic Medicine, Newcastle University, International Centre for Life, Newcastle upon Tyne NE1 3BZ, UK
| | - A Buskin
- Institute of Genetic Medicine, Newcastle University, International Centre for Life, Newcastle upon Tyne NE1 3BZ, UK
| | - I Paraskevopoulou
- Institute of Genetic Medicine, Newcastle University, International Centre for Life, Newcastle upon Tyne NE1 3BZ, UK
| | - S P Atkinson
- Institute of Genetic Medicine, Newcastle University, International Centre for Life, Newcastle upon Tyne NE1 3BZ, UK
| | - D Peberdy
- Institute of Genetic Medicine, Newcastle University, International Centre for Life, Newcastle upon Tyne NE1 3BZ, UK
| | - J F Passos
- Centre for Integrated Systems Biology of Ageing and Nutrition, Institute for Ageing and Health, Newcastle University, Newcastle upon Tyne NE4 5PL, UK
| | - M Lako
- Institute of Genetic Medicine, Newcastle University, International Centre for Life, Newcastle upon Tyne NE1 3BZ, UK
| |
Collapse
|
19
|
Li L, Wang J, Hou J, Wu Z, Zhuang Y, Lu M, Zhang Y, Zhou X, Li Z, Xiao W, Zhang W. Cdk1 interplays with Oct4 to repress differentiation of embryonic stem cells into trophectoderm. FEBS Lett 2012; 586:4100-7. [DOI: 10.1016/j.febslet.2012.10.030] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 10/07/2012] [Accepted: 10/11/2012] [Indexed: 01/17/2023]
|
20
|
D'Angelo F, Tiribuzi R, Armentano I, Kenny JM, Martino S, Orlacchio A. Mechanotransduction: tuning stem cells fate. J Funct Biomater 2011; 2:67-87. [PMID: 24956164 PMCID: PMC4030896 DOI: 10.3390/jfb2020067] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Revised: 06/07/2011] [Accepted: 06/17/2011] [Indexed: 01/10/2023] Open
Abstract
It is a general concern that the success of regenerative medicine-based applications is based on the ability to recapitulate the molecular events that allow stem cells to repair the damaged tissue/organ. To this end biomaterials are designed to display properties that, in a precise and physiological-like fashion, could drive stem cell fate both in vitro and in vivo. The rationale is that stem cells are highly sensitive to forces and that they may convert mechanical stimuli into a chemical response. In this review, we describe novelties on stem cells and biomaterials interactions with more focus on the implication of the mechanical stimulation named mechanotransduction.
Collapse
Affiliation(s)
- Francesco D'Angelo
- Department of Experimental Medicine and Biochemical Science, Section of Biochemistry and Molecular Biology, University of Perugia, Via del Giochetto, 06126 Perugia, Italy.
| | - Roberto Tiribuzi
- Department of Experimental Medicine and Biochemical Science, Section of Biochemistry and Molecular Biology, University of Perugia, Via del Giochetto, 06126 Perugia, Italy.
| | - Ilaria Armentano
- Materials Engineering Centre, UdR INSTM, NIPLAB, University of Perugia, Strada di Pentima 4, 05100 Terni, Italy.
| | - Josè Maria Kenny
- Materials Engineering Centre, UdR INSTM, NIPLAB, University of Perugia, Strada di Pentima 4, 05100 Terni, Italy.
| | - Sabata Martino
- Department of Experimental Medicine and Biochemical Science, Section of Biochemistry and Molecular Biology, University of Perugia, Via del Giochetto, 06126 Perugia, Italy.
| | - Aldo Orlacchio
- Department of Experimental Medicine and Biochemical Science, Section of Biochemistry and Molecular Biology, University of Perugia, Via del Giochetto, 06126 Perugia, Italy.
| |
Collapse
|
21
|
Cheong CY, Lon Ng PM, Ponnampalam R, Tsai HH, Bourque G, Lufkin T. In silico tandem affinity purification refines an Oct4 interaction list. Stem Cell Res Ther 2011; 2:26. [PMID: 21569470 PMCID: PMC3218817 DOI: 10.1186/scrt67] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 04/05/2011] [Accepted: 05/13/2011] [Indexed: 02/11/2023] Open
Abstract
INTRODUCTION Octamer-binding transcription factor 4 (Oct4) is a master regulator of early mammalian development. Its expression begins from the oocyte stage, becomes restricted to the inner cell mass of the blastocyst and eventually remains only in primordial germ cells. Unearthing the interactions of Oct4 would provide insight into how this transcription factor is central to cell fate and stem cell pluripotency. METHODS In the present study, affinity-tagged endogenous Oct4 cell lines were established via homologous recombination gene targeting in embryonic stem (ES) cells to express tagged Oct4. This allows tagged Oct4 to be expressed without altering the total Oct4 levels from their physiological levels. RESULTS Modified ES cells remained pluripotent. However, when modified ES cells were tested for their functionality, cells with a large tag failed to produce viable homozygous mice. Use of a smaller tag resulted in mice with normal development, viability and fertility. This indicated that the choice of tags can affect the performance of Oct4. Also, different tags produce a different repertoire of Oct4 interactors. CONCLUSIONS Using a total of four different tags, we found 33 potential Oct4 interactors, of which 30 are novel. In addition to transcriptional regulation, the molecular function associated with these Oct4-associated proteins includes various other catalytic activities, suggesting that, aside from chromosome remodeling and transcriptional regulation, Oct4 function extends more widely to other essential cellular mechanisms. Our findings show that multiple purification approaches are needed to uncover a comprehensive Oct4 protein interaction network.
Collapse
Affiliation(s)
- Clara Yujing Cheong
- Stem Cell and Developmental Biology Group, Genome Institute of Singapore, 60 Biopolis Street, 138672, Singapore
| | | | | | | | | | | |
Collapse
|