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Zhang H, Zhu H, Peng H, Sheng Y. Function of serine/arginine-rich splicing factors in hematopoiesis and hematopoietic malignancies. Cancer Cell Int 2024; 24:257. [PMID: 39034387 PMCID: PMC11265194 DOI: 10.1186/s12935-024-03438-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Accepted: 07/08/2024] [Indexed: 07/23/2024] Open
Abstract
The serine/arginine-rich splicing factors (SRSFs) play an important role in regulating the alternative splicing of precursor RNA (pre-RNA). During this procedure, introns are removed from the pre-RNA, while the exons are accurately joined together to produce mature mRNA. In addition, SRSFs also involved in DNA replication and transcription, mRNA stability and nuclear export, and protein translation. It is reported that SRSFs participate in hematopoiesis, development, and other important biological process. They are also associated with the development of several diseases, particularly cancers. While the basic physiological functions and the important roles of SRSFs in solid cancer have been extensively reviewed, a comprehensive summary of their significant functions in normal hematopoiesis and hematopoietic malignancies is currently absent. Hence, this review presents a summary of their roles in normal hematopoiesis and hematopoietic malignancies.
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Affiliation(s)
- Huifang Zhang
- Department of Hematology, the Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, P. R. China.
- Hunan Engineering Research Center of Targeted therapy for Hematopoietic Malignancies, Changsha, 410011, Hunan, P. R. China.
| | - Hongkai Zhu
- Department of Hematology, the Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, P. R. China
- Hunan Engineering Research Center of Targeted therapy for Hematopoietic Malignancies, Changsha, 410011, Hunan, P. R. China
| | - Hongling Peng
- Department of Hematology, the Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, P. R. China.
- Hunan Engineering Research Center of Targeted therapy for Hematopoietic Malignancies, Changsha, 410011, Hunan, P. R. China.
| | - Yue Sheng
- Department of Hematology, the Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, P. R. China.
- Hunan Engineering Research Center of Targeted therapy for Hematopoietic Malignancies, Changsha, 410011, Hunan, P. R. China.
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2
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De Gasperi R, Csernoch L, Dienes B, Gonczi M, Chakrabarty JK, Goeta S, Aslan A, Toro CA, Karasik D, Brown LM, Brotto M, Cardozo CP. Septin 7 interacts with Numb to preserve sarcomere structural organization and muscle contractile function. eLife 2024; 12:RP89424. [PMID: 38695862 PMCID: PMC11065422 DOI: 10.7554/elife.89424] [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] [Indexed: 05/04/2024] Open
Abstract
Here, we investigated the mechanisms by which aging-related reductions of the levels of Numb in skeletal muscle fibers contribute to loss of muscle strength and power, two critical features of sarcopenia. Numb is an adaptor protein best known for its critical roles in development, including asymmetric cell division, cell-type specification, and termination of intracellular signaling. Numb expression is reduced in old humans and mice. We previously showed that, in mouse skeletal muscle fibers, Numb is localized to sarcomeres where it is concentrated near triads; conditional inactivation of Numb and a closely related protein Numb-like (Numbl) in mouse myofibers caused weakness, disorganization of sarcomeres, and smaller mitochondria with impaired function. Here, we found that a single knockout of Numb in myofibers causes reduction in tetanic force comparable to a double Numb, Numbl knockout. We found by proteomics analysis of protein complexes isolated from C2C12 myotubes by immunoprecipitation using antibodies against Numb that Septin 7 is a potential Numb-binding partner. Septin 7 is a member of the family of GTP-binding proteins that organize into filaments, sheets, and rings, and is considered part of the cytoskeleton. Immunofluorescence evaluation revealed a partial overlap of staining for Numb and Septin 7 in myofibers. Conditional, inducible knockouts of Numb led to disorganization of Septin 7 staining in myofibers. These findings indicate that Septin 7 is a Numb-binding partner and suggest that interactions between Numb and Septin 7 are critical for structural organization of the sarcomere and muscle contractile function.
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Affiliation(s)
- Rita De Gasperi
- Department of Psychiatry and Friedman Brain Institute, Icahn School of Medicine at Mount SinaiNew YorkUnited States
- Spinal Cord Damage Research Center, James J. Peters VA Medical CenterBronxUnited States
| | - Laszlo Csernoch
- Department of Physiology, Faculty of Medicine, University of DebrecenDebrecenHungary
- ELKH-DE Cell Physiology Research Group, University of DebrecenDebrecenHungary
| | - Beatrix Dienes
- Department of Physiology, Faculty of Medicine, University of DebrecenDebrecenHungary
| | - Monika Gonczi
- Department of Physiology, Faculty of Medicine, University of DebrecenDebrecenHungary
| | - Jayanta K Chakrabarty
- Quantitative Proteomics and Metabolomics Center, Department of Biological Sciences, Columbia UniversityNew YorkUnited States
| | - Shahar Goeta
- Quantitative Proteomics and Metabolomics Center, Department of Biological Sciences, Columbia UniversityNew YorkUnited States
| | - Abdurrahman Aslan
- Spinal Cord Damage Research Center, James J. Peters VA Medical CenterBronxUnited States
- Department of Medicine, Icahn School of Medicine at Mount SinaiNew YorkUnited States
| | - Carlos A Toro
- Spinal Cord Damage Research Center, James J. Peters VA Medical CenterBronxUnited States
- Department of Medicine, Icahn School of Medicine at Mount SinaiNew YorkUnited States
| | - David Karasik
- Azrieli Faculty of Medicine, Bar Ilan UniversitySafedIsrael
| | - Lewis M Brown
- Quantitative Proteomics and Metabolomics Center, Department of Biological Sciences, Columbia UniversityNew YorkUnited States
| | - Marco Brotto
- Bone-Muscle Research Center, College of Nursing & Health Innovation,University of Texas at ArlingtonAustinUnited States
| | - Christopher P Cardozo
- Spinal Cord Damage Research Center, James J. Peters VA Medical CenterBronxUnited States
- Department of Rehabilitation Medicine, Icahn School of Medicine at Mount SinaiNew YorkUnited States
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3
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Gasperi RD, Csernoch L, Dienes B, Gonczi M, Chakrabarty JK, Goeta S, Aslan A, Toro CA, Karasik D, Brown LM, Brotto M, Cardozo CP. Septin 7 Interacts With Numb To Preserve Sarcomere Structural Organization And Muscle Contractile Function. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.11.540467. [PMID: 37461567 PMCID: PMC10350061 DOI: 10.1101/2023.05.11.540467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/23/2023]
Abstract
Here, we investigated mechanisms by which aging-related reductions of the levels of Numb in skeletal muscle fibers contribute to loss of muscle strength and power, two critical features of sarcopenia. Numb is an adaptor protein best known for its critical roles in development including asymmetric cell division, cell-type specification and termination of intracellular signaling. Numb expression is reduced in old humans and mice. We previously showed that, in mouse skeletal muscle fibers, Numb is localized to sarcomeres where it is concentrated near triads; conditional inactivation of Numb and a closely related protein Numb-like (NumbL) in mouse myofibers caused weakness, disorganization of sarcomeres and smaller mitochondria with impaired function. Here, we found that a single knockout of Numb in myofibers causes reduction in tetanic force comparable to a double Numb, NumbL knockout. We found by proteomics analysis of protein complexes isolated from C2C12 myotubes by immunoprecipitation using antibodies against Numb, that Septin 7 is a potential Numb binding partner. Septin 7 is a member of the family of GTP-binding proteins that organize into filaments, sheets and rings, and is considered part of the cytoskeleton. Immunofluorescence evaluation revealed a partial overlap of staining for Numb and Septin 7 in myofibers. Conditional, inducible knockouts of Numb led to disorganization of Septin 7 staining in myofibers. These findings indicate that Septin 7 is a Numb binding partner and suggest that interactions between Numb and Septin 7 are critical for structural organization of the sarcomere and muscle contractile function.
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4
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Ortega-Campos SM, García-Heredia JM. The Multitasker Protein: A Look at the Multiple Capabilities of NUMB. Cells 2023; 12:333. [PMID: 36672267 PMCID: PMC9856935 DOI: 10.3390/cells12020333] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 01/08/2023] [Accepted: 01/13/2023] [Indexed: 01/18/2023] Open
Abstract
NUMB, a plasma membrane-associated protein originally described in Drosophila, is involved in determining cell function and fate during early stages of development. It is secreted asymmetrically in dividing cells, with one daughter cell inheriting NUMB and the other inheriting its antagonist, NOTCH. NUMB has been proposed as a polarizing agent and has multiple functions, including endocytosis and serving as an adaptor in various cellular pathways such as NOTCH, Hedgehog, and the P53-MDM2 axis. Due to its role in maintaining cellular homeostasis, it has been suggested that NUMB may be involved in various human pathologies such as cancer and Alzheimer's disease. Further research on NUMB could aid in understanding disease mechanisms and advancing the field of personalized medicine and the development of new therapies.
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Affiliation(s)
- Sara M. Ortega-Campos
- Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío (HUVR), Consejo Superior de Investigaciones Científicas, Universidad de Sevilla, 41013 Sevilla, Spain
- CIBERONC, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - José Manuel García-Heredia
- Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío (HUVR), Consejo Superior de Investigaciones Científicas, Universidad de Sevilla, 41013 Sevilla, Spain
- CIBERONC, Instituto de Salud Carlos III, 28029 Madrid, Spain
- Departamento de Bioquímica Vegetal y Biología Molecular, Universidad de Sevilla, 41012 Sevilla, Spain
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Chen L, Tang J, Sheng W, Sun J, Ma Y, Dong M. ATP11A promotes EMT by regulating Numb PRR L in pancreatic cancer cells. PeerJ 2022; 10:e13172. [PMID: 35345586 PMCID: PMC8957272 DOI: 10.7717/peerj.13172] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 03/06/2022] [Indexed: 01/12/2023] Open
Abstract
Purpose The Numb protein plays a vital role in tumor development. The main aim of this study was to identify ATP11A, which is associated with the biological behavior of pancreatic cancer, and elucidate its relationship with Numb and the underlying mechanism behind this relationship. Methods First, data retrieved from The Cancer Genome Atlas (TCGA) and Genotype-Tissue Expression (GTEX) databases was used to investigate the expression of ATP11A mRNA and its relationship with Numb mRNA in pancreatic cancer. Western blot assays on 31 pairs of pancreatic cancer tissues and paracancerous tissues, and immunohistochemical assays on 81 pancreatic cancer specimens were performed in order to verify the expression of ATP11A in pancreatic cancer at the protein level. Next, ATP11A was overexpressed or knocked down to observe its effects on the invasion and migration ability of pancreatic cancer cells and the changes of downstream proteins. Rescue assays were conducted to determine the mechanism through which ATP11A affects Numb, ZEB1, Snail2 and other proteins. Furthermore, immunoprecipitation assays were performed to explore the interaction between ATP11A and Numb. Finally, pancreatic cancer cells were stimulated with TGFB1 and ATP11A expression was examined to explore whether the effect of ATP11A on EMT was TGFB dependent. Results At the mRNA level, the expression of ATP11A in pancreatic cancer tissues was significantly higher than in normal pancreatic tissues (P < 0.001). ATP11A expression was also highly correlated with Numb expression (R = 0.676). At the protein level, ATP11A expression in pancreatic cancer tissues was significantly higher than that in paracancerous tissues (P = 0.0009), and high ATP11A expression was also correlated with a worse prognosis. Moreover, our results showed that ATP11A can promote the invasion and migration of pancreatic cancer cells. Additionally, ATP11A could positively regulate the expression of Numb PRRL, Snail2 and ZEB1 proteins. The rescue experiment results showed that the enhancement effect of ATP11A on ZEB1/Snail2 was suppressed by the specific knockdown of Numb PRRL. In addition, the immunoprecipitation results showed that ATP11A could specifically bind to Numb PRRL. The expression of ATP11A was also upregulated after TGFB stimulation, suggesting that the effect of ATP11A on EMT is TGFB dependent. Conclusion ATP11A is significantly upregulated in pancreatic cancer tissues, where it promotes the invasion and migration ability of pancreatic cancer cells. It is also associated with adverse prognosis in pancreatic cancer. Furthermore, ATP11A affects the epithelial-to-mesenchymal transition (EMT) of pancreatic cancer by regulating the TGFB dependent Numb PRRL-ZEB1/Snail2 pathway.
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Affiliation(s)
- Lin Chen
- Department of Gastrointestinal Surgery, The First Hospital of China Medical University, Shenyang, China
| | - Jingtong Tang
- Department of Gastrointestinal Surgery, The First Hospital of China Medical University, Shenyang, China
| | - Weiwei Sheng
- Department of Gastrointestinal Surgery, The First Hospital of China Medical University, Shenyang, China
| | - Jian Sun
- Department of Gastrointestinal Surgery, The First Hospital of China Medical University, Shenyang, China
| | - Yuteng Ma
- Department of Gastrointestinal Surgery, The First Hospital of China Medical University, Shenyang, China
| | - Ming Dong
- Department of Gastrointestinal Surgery, The First Hospital of China Medical University, Shenyang, China
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De Gasperi R, Mo C, Azulai D, Wang Z, Harlow LM, Du Y, Graham Z, Pan J, Liu XH, Guo L, Zhang B, Ko F, Raczkowski AM, Bauman WA, Goulbourne CN, Zhao W, Brotto M, Cardozo CP. Numb is required for optimal contraction of skeletal muscle. J Cachexia Sarcopenia Muscle 2022; 13:454-466. [PMID: 35001540 PMCID: PMC8818612 DOI: 10.1002/jcsm.12907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 11/12/2021] [Accepted: 11/28/2021] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND The role of Numb, a protein that is important for cell fate and development and that, in human muscle, is expressed at reduced levels with advanced age, was investigated; adult mice skeletal muscle and its localization and function within myofibres were determined. METHODS Numb expression was evaluated by western blot. Numb localization was determined by confocal microscopy. The effects of conditional knock out (cKO) of Numb and the closely related gene Numb-like in skeletal muscle fibres were evaluated by in situ physiology, transmission and focused ion beam scanning electron microscopy, three-dimensional reconstruction of mitochondria, lipidomics, and bulk RNA sequencing. Additional studies using primary mouse myotubes investigated the effects of Numb knockdown on cell fusion, mitochondrial function, and calcium transients. RESULTS Numb protein expression was reduced by ~70% (P < 0.01) at 24 as compared with 3 months of age in gastrocnemius and tibialis anterior muscle. Numb was localized within muscle fibres as bands traversing fibres at regularly spaced intervals in close proximity to dihydropyridine receptors. The cKO of Numb and Numb-like reduced specific tetanic force by 36% (P < 0.01), altered mitochondrial spatial relationships to sarcomeric structures, increased Z-line spacing by 30% (P < 0.0001), perturbed sarcoplasmic reticulum organization and reduced mitochondrial volume by over 80% (P < 0.01). Only six genes were differentially expressed in cKO mice: Itga4, Sema7a, Irgm2, Vezf1, Mib1, and Tmem132a. Several lipid mediators derived from polyunsaturated fatty acids through lipoxygenases were up-regulated in Numb cKO skeletal muscle: 12-HEPE was increased by ~250% (P < 0.05) and 17,18-EpETE by ~240% (P < 0.05). In mouse primary myotubes, Numb knockdown reduced cell fusion (~20%, P < 0.01) and delayed the caffeine-induced rise in cytosolic calcium concentrations by more than 100% (P < 0.01). CONCLUSIONS These findings implicate Numb as a critical factor in skeletal muscle structure and function and suggest that Numb is critical for calcium release. We therefore speculate that Numb plays critical roles in excitation-contraction coupling, one of the putative targets of aged skeletal muscles. These findings provide new insights into the molecular underpinnings of the loss of muscle function observed with sarcopenia.
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Affiliation(s)
- Rita De Gasperi
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA, Bronx, NY, USA.,Department of Psychiatry and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Chenglin Mo
- Bone-Muscle Research Center, College of Nursing & Health Innovation, The University of Texas at Arlington, Arlington, TX, USA
| | - Daniella Azulai
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA, Bronx, NY, USA
| | - Zhiying Wang
- Bone-Muscle Research Center, College of Nursing & Health Innovation, The University of Texas at Arlington, Arlington, TX, USA
| | - Lauren M Harlow
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA, Bronx, NY, USA
| | - Yating Du
- Bone-Muscle Research Center, College of Nursing & Health Innovation, The University of Texas at Arlington, Arlington, TX, USA
| | - Zachary Graham
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA, Bronx, NY, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Jiangping Pan
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA, Bronx, NY, USA
| | - Xin-Hua Liu
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA, Bronx, NY, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Lei Guo
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.,Mount Sinai Center for Transformative Disease Modeling, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Bin Zhang
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.,Mount Sinai Center for Transformative Disease Modeling, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Fred Ko
- Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA.,Department of Geriatrics and Palliative Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | | | - William A Bauman
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA, Bronx, NY, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA.,Department of Rehabilitation Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Chris N Goulbourne
- Center for Dementia Research, Nathan S. Kline Institute, Orangeburg, NY, USA
| | - Wei Zhao
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA, Bronx, NY, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Marco Brotto
- Bone-Muscle Research Center, College of Nursing & Health Innovation, The University of Texas at Arlington, Arlington, TX, USA
| | - Christopher P Cardozo
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA, Bronx, NY, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA.,Department of Rehabilitation Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
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Li Y, Wang D, Wang H, Huang X, Wen Y, Wang B, Xu C, Gao J, Liu J, Tong J, Wang M, Su P, Ren S, Ma F, Li H, Bresnick EH, Zhou J, Shi L. A splicing factor switch controls hematopoietic lineage specification of pluripotent stem cells. EMBO Rep 2021; 22:e50535. [PMID: 33319461 PMCID: PMC7788460 DOI: 10.15252/embr.202050535] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 10/26/2020] [Accepted: 11/12/2020] [Indexed: 11/09/2022] Open
Abstract
Alternative splicing (AS) leads to transcriptome diversity in eukaryotic cells and is one of the key regulators driving cellular differentiation. Although AS is of crucial importance for normal hematopoiesis and hematopoietic malignancies, its role in early hematopoietic development is still largely unknown. Here, by using high-throughput transcriptomic analyses, we show that pervasive and dynamic AS takes place during hematopoietic development of human pluripotent stem cells (hPSCs). We identify a splicing factor switch that occurs during the differentiation of mesodermal cells to endothelial progenitor cells (EPCs). Perturbation of this switch selectively impairs the emergence of EPCs and hemogenic endothelial progenitor cells (HEPs). Mechanistically, an EPC-induced alternative spliced isoform of NUMB dictates EPC specification by controlling NOTCH signaling. Furthermore, we demonstrate that the splicing factor SRSF2 regulates splicing of the EPC-induced NUMB isoform, and the SRSF2-NUMB-NOTCH splicing axis regulates EPC generation. The identification of this splicing factor switch provides a new molecular mechanism to control cell fate and lineage specification.
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Affiliation(s)
- Yapu Li
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Ding Wang
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Hongtao Wang
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Xin Huang
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Yuqi Wen
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - BingRui Wang
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Changlu Xu
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Jie Gao
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Jinhua Liu
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Jingyuan Tong
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Mengge Wang
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Pei Su
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Sirui Ren
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Feng Ma
- Institute of Blood TransfusionChinese Academy of Medical Sciences & Peking Union Medical CollegeChengduChina
| | - Hong‐Dong Li
- School of Computer Science and EngineeringCentral South UniversityChangshaHunanChina
| | - Emery H Bresnick
- Wisconsin Blood Cancer Research InstituteDepartment of Cell and Regenerative BiologySchool of Medicine and Public HealthUniversity of WisconsinMadisonWIUSA
| | - Jiaxi Zhou
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
| | - Lihong Shi
- State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Diseases HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina
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8
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Dou XQ, Chen XJ, Zhou Q, Wen MX, Zhang SZ, Zhang SQ. miR-335 modulates Numb alternative splicing via targeting RBM10 in endometrial cancer. Kaohsiung J Med Sci 2020; 36:171-177. [PMID: 31894898 DOI: 10.1002/kjm2.12149] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 10/13/2019] [Indexed: 12/19/2022] Open
Abstract
Numb is a conserved protein plays important roles in the development of cancer. Two Numb isoforms have been found produced by alternative splicing and play contrast roles in regulating cellular functions. It is reported that the expression of Numb long isoform (Numb-L) was increased in various kinds of cancers, but in endometrial cancer, the condition is still unknown. The level of two Numb transcripts and protein isoforms were detected by semiquantitative polymerase chain reaction and immunoblotting in 47 paired endometrial tumor and adjacent non-tumor control tissues. The level of three alternative splicing related proteins: RBM5, RBM6, and RBM10 was determined by immunoblotting. MiRNAs targeting RBM10 were predicted by bioinformatics tools and their interaction with RBM10 was confirmed by luciferase assay and immunoblotting. The function of miR-335 in endometrial cancer was examined in xenograft mouse model. Numb-L level was increased in tumors and negatively correlated with RBM10 protein level. RBM10 mRNA level was not significantly altered in endometrial tumors suggesting its expression may regulated by post transcriptional regulators such as miRNAs. We identified miR-133a, miR-133b, and miR-335 directly target RBM10, but only miR-335 level increased in tumors and negatively correlated with RBM10 protein level. miR-335 overexpression promoted tumor growth by downregulating RBM10 and upregulating Numb-L level in xenograft mouse model. miR-335 overexpression promoted Numb-L expression via targeting RBM10 in endometrial cancer, which may provide new biomarkers for EC diagnosis.
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Affiliation(s)
- Xiao-Qing Dou
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China.,Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Shandong University, Jinan, China
| | - Xiu-Juan Chen
- Department of Obstetrics and Gynecology, People's Hospital of Rizhao, Rizhao, China
| | - Qun Zhou
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Ming-Xiao Wen
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Shu-Zhen Zhang
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Shi-Qian Zhang
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Shandong University, Jinan, China
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9
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Crosstalk between Notch, HIF-1α and GPER in Breast Cancer EMT. Int J Mol Sci 2018; 19:ijms19072011. [PMID: 29996493 PMCID: PMC6073901 DOI: 10.3390/ijms19072011] [Citation(s) in RCA: 100] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 07/04/2018] [Accepted: 07/09/2018] [Indexed: 12/15/2022] Open
Abstract
The Notch signaling pathway acts in both physiological and pathological conditions, including embryonic development and tumorigenesis. In cancer progression, diverse mechanisms are involved in Notch-mediated biological responses, including angiogenesis and epithelial-mesenchymal-transition (EMT). During EMT, the activation of cellular programs facilitated by transcriptional repressors results in epithelial cells losing their differentiated features, like cell–cell adhesion and apical–basal polarity, whereas they gain motility. As it concerns cancer epithelial cells, EMT may be consequent to the evolution of genetic/epigenetic instability, or triggered by factors that can act within the tumor microenvironment. Following a description of the Notch signaling pathway and its major regulatory nodes, we focus on studies that have given insights into the functional interaction between Notch signaling and either hypoxia or estrogen in breast cancer cells, with a particular focus on EMT. Furthermore, we describe the role of hypoxia signaling in breast cancer cells and discuss recent evidence regarding a functional interaction between HIF-1α and GPER in both breast cancer cells and cancer-associated fibroblasts (CAFs). On the basis of these studies, we propose that a functional network between HIF-1α, GPER and Notch may integrate tumor microenvironmental cues to induce robust EMT in cancer cells. Further investigations are required in order to better understand how hypoxia and estrogen signaling may converge on Notch-mediated EMT within the context of the stroma and tumor cells interaction. However, the data discussed here may anticipate the potential benefits of further pharmacological strategies targeting breast cancer progression.
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10
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Shao X, Ding Z, Zhao M, Liu K, Sun H, Chen J, Liu X, Zhang Y, Hong Y, Li H, Li H. Mammalian Numb protein antagonizes Notch by controlling postendocytic trafficking of the Notch ligand Delta-like 4. J Biol Chem 2017; 292:20628-20643. [PMID: 29042443 DOI: 10.1074/jbc.m117.800946] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 09/30/2017] [Indexed: 11/06/2022] Open
Abstract
The biological antagonism between the signaling proteins Numb and Notch has been implicated in the regulation of many developmental processes, especially in asymmetric cell division. Mechanistic studies show that Numb inactivates Notch via endocytosis and proteasomal degradation that directly reduce Notch protein levels at the cell surface. However, some aspects of how Numb antagonizes Notch remain unclear. Here, we report a novel mechanism in which Numb acts as a Notch antagonist by controlling the intracellular destination and stability of the Notch ligand Delta-like 4 (Dll4) through a postendocytic-sorting process. We observed that Numb/Numblike knockdown increases the stability and cell-surface accumulation of Dll4. Further study indicated that Numb acts as a sorting switch to control the postendocytic trafficking of Dll4. Of note, the Numb/Numblike knockdown decreased Dll4 delivery to the lysosome, while increasing the recycling of Dll4 to the plasma membrane. Moreover, we demonstrate that this enrichment of Dll4 at the cell surface within Numb/Numblike knockdown cells could activate Notch signaling in neighboring cells. We also provide evidence that Numb negatively controls the Dll4 plasma membrane recycling through a well-documented recycling regulator protein AP1. In conclusion, our study has uncovered a molecular mechanism whereby Numb regulates the endocytic trafficking of the Notch ligand Dll4. Our findings provide a new perspective on how Numb counteracts Notch signaling and sheds additional critical insights into the antagonistic relationship between Numb and Notch signaling.
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Affiliation(s)
- Ximing Shao
- From the Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Zhihao Ding
- From the Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Ming Zhao
- the Department of Oncology, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Ke Liu
- From the Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Haiyan Sun
- From the Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Juntao Chen
- From the Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Xianming Liu
- From the Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Yuzhen Zhang
- the Research Center for Translational Medicine, Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Yang Hong
- the Department of Cell Biology and Physiology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, and
| | - Huashun Li
- the ATCG Corp., BioBay, Suzhou Industrial Park, Suzhou, Jiangsu 215123, China
| | - Hongchang Li
- From the Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China,
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11
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Tarn WY, Kuo HC, Yu HI, Liu SW, Tseng CT, Dhananjaya D, Hung KY, Tu CC, Chang SH, Huang GJ, Chiu IM. RBM4 promotes neuronal differentiation and neurite outgrowth by modulating Numb isoform expression. Mol Biol Cell 2016; 27:1676-83. [PMID: 27009199 PMCID: PMC4865323 DOI: 10.1091/mbc.e15-11-0798] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 03/18/2016] [Indexed: 01/22/2023] Open
Abstract
RBM4 modulates alternative exon selection of Numb and up-regulates proneural Mash1 gene expression, possibly via specific Numb isoforms. RBM4 overexpression promotes neuronal cell differentiation. Moreover, RBM4 is essential for neurite outgrowth in primary cortical neurons by modulating specific Numb isoform expression. RBM4 participates in cell differentiation by regulating tissue-specific alternative pre-mRNA splicing. RBM4 also has been implicated in neurogenesis in the mouse embryonic brain. Using mouse embryonal carcinoma P19 cells as a neural differentiation model, we observed a temporal correlation between RBM4 expression and a change in splicing isoforms of Numb, a cell-fate determination gene. Knockdown of RBM4 affected the inclusion/exclusion of exons 3 and 9 of Numb in P19 cells. RBM4-deficient embryonic mouse brain also exhibited aberrant splicing of Numb pre-mRNA. Using a splicing reporter minigene assay, we demonstrated that RBM4 promoted exon 3 inclusion and exon 9 exclusion. Moreover, we found that RBM4 depletion reduced the expression of the proneural gene Mash1, and such reduction was reversed by an RBM4-induced Numb isoform containing exon 3 but lacking exon 9. Accordingly, induction of ectopic RBM4 expression in neuronal progenitor cells increased Mash1 expression and promoted cell differentiation. Finally, we found that RBM4 was also essential for neurite outgrowth from cortical neurons in vitro. Neurite outgrowth defects of RBM4-depleted neurons were rescued by RBM4-induced exon 9–lacking Numb isoforms. Therefore our findings indicate that RBM4 modulates exon selection of Numb to generate isoforms that promote neuronal cell differentiation and neurite outgrowth.
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Affiliation(s)
- Woan-Yuh Tarn
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Hung-Che Kuo
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Hsin-I Yu
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Shin-Wu Liu
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Ching-Tzu Tseng
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Dodda Dhananjaya
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Kuan-Yang Hung
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Chi-Chiang Tu
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Shuo-Hsiu Chang
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Guo-Jen Huang
- Graduate Institute of Biomedical Sciences, Chung-Gung University, Tao-Yuan City 33302, Taiwan
| | - Ing-Ming Chiu
- National Health Research Institutes, Chu-Nan 35053, Taiwan
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12
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Lu YY, Xu W, Ji J, Feng D, Sourbier C, Yang Y, Qu J, Zeng Z, Wang C, Chang X, Chen Y, Mishra A, Xu M, Lee MJ, Lee S, Trepel J, Linehan WM, Wang XW, Yang Y, Neckers L. Alternative splicing of the cell fate determinant Numb in hepatocellular carcinoma. Hepatology 2015; 62:1122-31. [PMID: 26058814 PMCID: PMC4589429 DOI: 10.1002/hep.27923] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 06/01/2015] [Indexed: 12/30/2022]
Abstract
UNLABELLED The cell fate determinant Numb is aberrantly expressed in cancer. Numb is alternatively spliced, with one isoform containing a long proline-rich region (PRR(L) ) compared to the other with a short PRR (PRR(S) ). Recently, PRR(L) was reported to enhance proliferation of breast and lung cancer cells. However, the importance of Numb alternative splicing in hepatocellular carcinoma (HCC) remains unexplored. We report here that Numb PRR(L) expression is increased in HCC and associated with early recurrence and reduced overall survival after surgery. In a panel of HCC cell lines, PRR(L) generally promotes and PRR(S) suppresses proliferation, migration, invasion, and colony formation. Knockdown of PRR(S) leads to increased Akt phosphorylation and c-Myc expression, and Akt inhibition or c-Myc silencing dampens the proliferative impact of Numb PRR(S) knockdown. In the cell models explored in this study, alternative splicing of Numb PRR isoforms is coordinately regulated by the splicing factor RNA-binding Fox domain containing 2 (RbFox2) and the kinase serine/arginine protein-specific kinase 2 (SRPK2). Knockdown of the former causes accumulation of PRR(L) , while SRPK2 knockdown causes accumulation of PRR(S) . The subcellular location of SRPK2 is regulated by the molecular chaperone heat shock protein 90, and heat shock protein 90 inhibition or knockdown phenocopies SRPK2 knockdown in promoting accumulation of Numb PRR(S) . Finally, HCC cell lines that predominantly express PRR(L) are differentially sensitive to heat shock protein 90 inhibition. CONCLUSION Alternative splicing of Numb may provide a useful prognostic biomarker in HCC and is pharmacologically tractable.
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Affiliation(s)
- Yin Ying Lu
- Center for Therapeutic Research of Hepatocarcinoma, Beijing 302 Hospital, 100 Xi Si Huan Middle Road, Beijing 100039, China
- Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892
| | - Wanping Xu
- Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892
| | - Junfang Ji
- Liver Carcinogenesis Section, Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892
| | - Dechun Feng
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD, 20892
| | - Carole Sourbier
- Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892
| | - Youfeng Yang
- Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892
| | - Jianhui Qu
- Center for Therapeutic Research of Hepatocarcinoma, Beijing 302 Hospital, 100 Xi Si Huan Middle Road, Beijing 100039, China
| | - Zhen Zeng
- Center for Therapeutic Research of Hepatocarcinoma, Beijing 302 Hospital, 100 Xi Si Huan Middle Road, Beijing 100039, China
| | - Chunping Wang
- Center for Therapeutic Research of Hepatocarcinoma, Beijing 302 Hospital, 100 Xi Si Huan Middle Road, Beijing 100039, China
| | - Xiujuan Chang
- Center for Therapeutic Research of Hepatocarcinoma, Beijing 302 Hospital, 100 Xi Si Huan Middle Road, Beijing 100039, China
| | - Yan Chen
- Center for Therapeutic Research of Hepatocarcinoma, Beijing 302 Hospital, 100 Xi Si Huan Middle Road, Beijing 100039, China
| | - Alok Mishra
- Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892
| | - Max Xu
- Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892
| | - Min-Jung Lee
- Developmental Therapeutics Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892
| | - Sunmin Lee
- Developmental Therapeutics Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892
| | - Jane Trepel
- Developmental Therapeutics Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892
| | - W. Marston Linehan
- Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892
| | - Xin Wei Wang
- Liver Carcinogenesis Section, Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892
| | - Yongping Yang
- Center for Therapeutic Research of Hepatocarcinoma, Beijing 302 Hospital, 100 Xi Si Huan Middle Road, Beijing 100039, China
| | - Len Neckers
- Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892
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13
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Abstract
FBW7 (F-box and WD repeat domain-containing 7) or Fbxw7 is a tumor suppressor, which promotes the ubiquitination and subsequent degradation of numerous oncoproteins including Mcl-1, Cyclin E, Notch, c- Jun, and c-Myc. In turn, FBW7 is regulated by multiple upstream factors including p53, C/EBP-δ, EBP2, Pin1, Hes-5 and Numb4 as well as by microRNAs such as miR-223, miR-27a, miR-25, and miR-129-5p. Given that the Fbw7 tumor suppressor is frequently inactivated or deleted in various human cancers, targeting FBW7 regulators is a promising anti-cancer therapeutic strategy.
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14
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Werts AD, Goldstein B. How signaling between cells can orient a mitotic spindle. Semin Cell Dev Biol 2011; 22:842-9. [PMID: 21807106 DOI: 10.1016/j.semcdb.2011.07.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Revised: 07/13/2011] [Accepted: 07/15/2011] [Indexed: 10/25/2022]
Abstract
In multicellular animals, cell communication sometimes serves to orient the direction in which cells divide. Control of division orientation has been proposed to be critical for partitioning developmental determinants and for maintaining epithelial architecture. Surprisingly, there are few cases where we understand the mechanisms by which external cues, transmitted by intercellular signaling, specify the division orientation of animal cells. One would predict that cytosolic molecules or complexes exist that are capable of interpreting extrinsic cues, translating the positions of these cues into forces on microtubules of the mitotic spindle. In recent years, a key intracellular complex has been identified that is required for pulling forces on mitotic spindles in Drosophila, Caenorhabditis elegans and vertebrate systems. One member of this complex, a protein with tetratricopeptide repeat (TPR) and GoLoco (Gα-binding) domains, has been found localized in positions that coincide with the positions of spindle-orienting extracellular cues. Do TPR-GoLoco proteins function as conserved, spatially regulated mediators of spindle orientation by intercellular signaling? Here, we review the relevant evidence among cases from diverse animal systems where this protein complex has been found to localize to specific cell-cell contacts and to be involved in orienting mitotic spindles.
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Affiliation(s)
- Adam D Werts
- Biology Department, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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15
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Yang Y, Zhu R, Bai J, Zhang X, Tian Y, Li X, Peng Z, He Y, Chen L, Ji Q, Chen W, Fang D, Wang R. Numb modulates intestinal epithelial cells toward goblet cell phenotype by inhibiting the Notch signaling pathway. Exp Cell Res 2011; 317:1640-8. [PMID: 21557937 DOI: 10.1016/j.yexcr.2011.04.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2010] [Revised: 04/07/2011] [Accepted: 04/14/2011] [Indexed: 12/16/2022]
Abstract
Numb was originally identified as an important cell fate determinant that is asymmetrically inherited during mitosis and controls the fate of sibling cells by inhibiting the Notch signaling pathway in neural tissue. The small intestinal epithelium originates from the division of stem cells that reside in the crypt, which further differentiate into goblet cells, absorptive cells, paneth cells, and enteroendocrine cells. However, Numb's involvement in the differentiation process of intestinal epithelium is largely unknown. In the present study, we confirm that both the Numb mRNA and protein isoforms are expressed in adult mouse intestinal mucosa. Numb protein is ubiquitously expressed throughout the crypt-villus axis of the small intestinal epithelium and is mainly localized to the cytoplasmic membrane. Down-regulation of endogenous Numb using RNA interference in cultured intestinal LS174T cells increased Notch signaling, leading to the up-regulation of Hes1 and the down-regulation of Hath1. Knockdown of Numb alleviated MUC2 protein expression and led to loss of the goblet cell phenotype in LS174Tl cells. Our results provide the first evidence that Numb, an important cell fate determinant, modulates intestinal epithelial cells towards the goblet cell phenotype by inhibiting the Notch signaling pathway.
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Affiliation(s)
- Yongtao Yang
- Department of Gastroenterology, Southwest Hospital, Third Military Medical University, Chongqing, China
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16
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Yong KJ, Yan B. The relevance of symmetric and asymmetric cell divisions to human central nervous system diseases. J Clin Neurosci 2011; 18:458-63. [PMID: 21288724 DOI: 10.1016/j.jocn.2010.08.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Revised: 08/09/2010] [Accepted: 08/09/2010] [Indexed: 12/29/2022]
Abstract
During development of the embryonic central nervous system (CNS), large numbers of neurons and glia are generated from the neuroepithelium and its progenitor derivatives as a result of symmetric and asymmetric cell divisions. We describe the biology of symmetric and asymmetric cell divisions in the CNS as gleaned from animal models, and discuss the relevance of these processes to human CNS development and disease.
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Affiliation(s)
- Kol Jia Yong
- Cancer Science Institute, National University of Singapore, Singapore
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