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Protein tyrosine phosphatases in skeletal development and diseases. Bone Res 2022; 10:10. [PMID: 35091552 PMCID: PMC8799702 DOI: 10.1038/s41413-021-00181-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 07/29/2021] [Accepted: 09/14/2021] [Indexed: 12/24/2022] Open
Abstract
Skeletal development and homeostasis in mammals are modulated by finely coordinated processes of migration, proliferation, differentiation, and death of skeletogenic cells originating from the mesoderm and neural crest. Numerous molecular mechanisms are involved in these regulatory processes, one of which is protein posttranslational modifications, particularly protein tyrosine phosphorylation (PYP). PYP occurs mainly through the action of protein tyrosine kinases (PTKs), modifying protein enzymatic activity, changing its cellular localization, and aiding in the assembly or disassembly of protein signaling complexes. Under physiological conditions, PYP is balanced by the coordinated action of PTKs and protein tyrosine phosphatases (PTPs). Dysregulation of PYP can cause genetic, metabolic, developmental, and oncogenic skeletal diseases. Although PYP is a reversible biochemical process, in contrast to PTKs, little is known about how this equilibrium is modulated by PTPs in the skeletal system. Whole-genome sequencing has revealed a large and diverse superfamily of PTP genes (over 100 members) in humans, which can be further divided into cysteine (Cys)-, aspartic acid (Asp)-, and histidine (His)-based PTPs. Here, we review current knowledge about the functions and regulatory mechanisms of 28 PTPs involved in skeletal development and diseases; 27 of them belong to class I and II Cys-based PTPs, and the other is an Asp-based PTP. Recent progress in analyzing animal models that harbor various mutations in these PTPs and future research directions are also discussed. Our literature review indicates that PTPs are as crucial as PTKs in supporting skeletal development and homeostasis.
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PTPN21 Overexpression Promotes Osteogenic and Adipogenic Differentiation of Bone Marrow-Derived Mesenchymal Stem Cells but Inhibits the Immunosuppressive Function. Stem Cells Int 2019; 2019:4686132. [PMID: 31885609 PMCID: PMC6907062 DOI: 10.1155/2019/4686132] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 08/05/2019] [Accepted: 10/04/2019] [Indexed: 12/18/2022] Open
Abstract
Protein tyrosine phosphatases (PTPs) act as key regulators in various cellular processes such as proliferation, differentiation, and migration. Our previous research demonstrated that non-receptor-typed PTP21 (PTPN21), a member of the PTP family, played a critical role in the proliferation, cell cycle, and chemosensitivity of acute lymphoblastic leukemia cells. However, the role of PTPN21 in the bone marrow microenvironment has not yet been elucidated. In the study, we explored the effects of PTPN21 on human bone marrow-derived mesenchymal stem cells (BM-MSCs) via lentiviral-mediated overexpression and knock-down of PTPN21 in vitro. Overexpressing PTPN21 in BM-MSCs inhibited the proliferation through arresting cell cycle at the G0 phase but rendered them a higher osteogenic and adipogenic differentiation potential. In addition, overexpressing PTPN21 in BM-MSCs increased their senescence levels through upregulation of P21 and P53 and dramatically changed the levels of crosstalk with their typical target cells including immunocytes, tumor cells, and vascular endothelial cells. BM-MSCs overexpressing PTPN21 had an impaired immunosuppressive function and an increased capacity of recruiting tumor cells and vascular endothelial cells in a chemotaxis transwell coculture system. Collectively, our data suggested that PTPN21 acted as a pleiotropic factor in modulating the function of human BM-MSCs.
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Shen LF, Chen YJ, Liu KM, Haddad ANS, Song IW, Roan HY, Chen LY, Yen JJY, Chen YJ, Wu JY, Chen YT. Role of S-Palmitoylation by ZDHHC13 in Mitochondrial function and Metabolism in Liver. Sci Rep 2017; 7:2182. [PMID: 28526873 PMCID: PMC5438363 DOI: 10.1038/s41598-017-02159-4] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 04/12/2017] [Indexed: 11/17/2022] Open
Abstract
Palmitoyltransferase (PAT) catalyses protein S-palmitoylation which adds 16-carbon palmitate to specific cysteines and contributes to various biological functions. We previously reported that in mice, deficiency of Zdhhc13, a member of the PAT family, causes severe phenotypes including amyloidosis, alopecia, and osteoporosis. Here, we show that Zdhhc13 deficiency results in abnormal liver function, lipid abnormalities, and hypermetabolism. To elucidate the molecular mechanisms underlying these disease phenotypes, we applied a site-specific quantitative approach integrating an alkylating resin-assisted capture and mass spectrometry-based label-free strategy for studying the liver S-palmitoylome. We identified 2,190 S-palmitoylated peptides corresponding to 883 S-palmitoylated proteins. After normalization using the membrane proteome with TMT10-plex labelling, 400 (31%) of S-palmitoylation sites on 254 proteins were down-regulated in Zdhhc13-deficient mice, representing potential ZDHHC13 substrates. Among these, lipid metabolism and mitochondrial dysfunction proteins were overrepresented. MCAT and CTNND1 were confirmed to be specific ZDHHC13 substrates. Furthermore, we found impaired mitochondrial function in hepatocytes of Zdhhc13-deficient mice and Zdhhc13-knockdown Hep1–6 cells. These results indicate that ZDHHC13 is an important regulator of mitochondrial activity. Collectively, our study allows for a systematic view of S-palmitoylation for identification of ZDHHC13 substrates and demonstrates the role of ZDHHC13 in mitochondrial function and metabolism in liver.
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Affiliation(s)
- Li-Fen Shen
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Yi-Ju Chen
- Institute of Chemistry, Academia Sinica, Taipei, Taiwan
| | - Kai-Ming Liu
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Amir N Saleem Haddad
- Department of Biology, University of Toronto Mississauga, Mississauga, Ontario, Canada
| | - I-Wen Song
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Hsiao-Yuh Roan
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Li-Ying Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Jeffrey J Y Yen
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Yu-Ju Chen
- Institute of Chemistry, Academia Sinica, Taipei, Taiwan
| | - Jer-Yuarn Wu
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Yuan-Tsong Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan. .,Department of Pediatrics, Duke University Medical Center, Durham, North Carolina, United States of America.
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Simile MM, Latte G, Demartis MI, Brozzetti S, Calvisi DF, Porcu A, Feo CF, Seddaiu MA, Daino L, Berasain C, Tomasi ML, Avila MA, Feo F, Pascale RM. Post-translational deregulation of YAP1 is genetically controlled in rat liver cancer and determines the fate and stem-like behavior of the human disease. Oncotarget 2016; 7:49194-49216. [PMID: 27359056 PMCID: PMC5226501 DOI: 10.18632/oncotarget.10246] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 05/05/2016] [Indexed: 01/29/2023] Open
Abstract
Previous studies showed that YAP1 is over-expressed in hepatocellular carcinoma (HCC). Here we observed higher expression of Yap1/Ctgf axis in dysplastic nodules and HCC chemically-induced in F344 rats, genetically susceptible to hepatocarcinogenesis, than in lesions induced in resistant BN rats. In BN rats, highest increase in Yap1-tyr357, p73 phosphorylation and Caspase 3 cleavage occurred. In human HCCs with poorer prognosis (< 3 years survival after partial liver resection, HCCP), levels of YAP1, CTGF, 14-3-3, and TEAD proteins, and YAP1-14-3-3 and YAP1-TEAD complexes were higher than in HCCs with better outcome (> 3 years survival; HCCB). In the latter, higher levels of phosphorylated YAP1-ser127, YAP1-tyr357 and p73, YAP1 ubiquitination, and Caspase 3 cleavage occurred. Expression of stemness markers NANOG, OCT-3/4, and CD133 were highest in HCCP and correlated with YAP1 and YAP1-TEAD levels. In HepG2, Huh7, and Hep3B cells, forced YAP1 over-expression led to stem cell markers expression and increased cell viability, whereas inhibition of YAP1 expression by specific siRNA, or transfection of mutant YAP1 which does not bind to TEAD, induced opposite alterations. These changes were associated, in Huh7 cells transfected with YAP1 or YAP1 siRNA, with stimulation or inhibition of cell migration and invasivity, respectively. Furthermore, transcriptome analysis showed that YAP1 transfection in Huh7 cells induces over-expression of genes involved in tumor stemness. In conclusion, Yap1 post-translational modifications favoring its ubiquitination and apoptosis characterize HCC with better prognosis, whereas conditions favoring the formation of YAP1-TEAD complexes are associated with aggressiveness and acquisition of stemness features by HCC cells.
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Affiliation(s)
- Maria M. Simile
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Gavinella Latte
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Maria I. Demartis
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Stefania Brozzetti
- Department of Surgery “Pietro Valdoni”, University of Rome ‘Sapienza’', Rome, Italy
| | - Diego F. Calvisi
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Alberto Porcu
- Department of Clinical and Experimental Medicine, Division of Surgery, University of Sassari, Sassari, Italy
| | - Claudio F. Feo
- Department of Clinical and Experimental Medicine, Division of Surgery, University of Sassari, Sassari, Italy
| | - Maria A. Seddaiu
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Lucia Daino
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Carmen Berasain
- Division of Hepatology, Centro de Investigación Médica Aplicada (CIMA), University of Navarra, Pamplona, Spain
- CIBERehd, Instituto de Salud Carlos III, Madrid, Spain
- IDISNA, Navarra Institute for Health Research, Pamplona, Spain
| | - Maria L. Tomasi
- Division of Gastroenterology, Cedars-Sinai Medical Center, Los Angeles, CA, USA
- USC Research Center for Liver Diseases, Keck School of Medicine of University of Southern California, Los Angeles, CA, USA
| | - Matias A. Avila
- Division of Hepatology, Centro de Investigación Médica Aplicada (CIMA), University of Navarra, Pamplona, Spain
- CIBERehd, Instituto de Salud Carlos III, Madrid, Spain
- IDISNA, Navarra Institute for Health Research, Pamplona, Spain
| | - Francesco Feo
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Rosa M. Pascale
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
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Kim WK, Oh KJ, Choi HR, Park A, Han BS, Chi SW, Kim SJ, Bae KH, Lee SC. MAP kinase phosphatase 3 inhibits brown adipocyte differentiation via regulation of Erk phosphorylation. Mol Cell Endocrinol 2015; 416:70-6. [PMID: 26325440 DOI: 10.1016/j.mce.2015.08.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 08/10/2015] [Accepted: 08/25/2015] [Indexed: 12/29/2022]
Abstract
Brown fat has been highlight as a new therapeutic target for treatment of obesity and diabetes. However, molecular mechanism underlying brown adipogenesis are not fully understood. Here, we identified that MAP kinase phosphatase 3 (MKP3) has a novel role as regulator of brown adipocyte differentiation. The expression of MKP3 was significantly decreased during the early stage(s) of brown adipocyte differentiation in HIB-1B cells and primary cells. Ectopic expression of MKP3 led to reduced brown adipocyte differentiation, whereas depletion of MKP3 significantly enhanced the differentiation of primary brown preadipocytes. Consistently, we found an increased brown adipocyte differentiation in MKP3-null MEF cells. These inhibitory effects of MKP3 could be resulted via the temporal regulation of Erk activation. In recent, it was reported that MKP3 deficient mice are resistant to diet-induced obesity, and display enhanced energy expenditure. Taken together, we suggest that MKP3 could be an important factor in the regulation of brown adipocyte differentiation.
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Affiliation(s)
- Won Kon Kim
- Functional Genomics Research Center, KRIBB, Daejeon, 305-806, Republic of Korea; Department of Functional Genomics, University of Science and Technology of Korea, Daejeon, 305-806, Republic of Korea
| | - Kyoung-Jin Oh
- Functional Genomics Research Center, KRIBB, Daejeon, 305-806, Republic of Korea
| | - Hye-Ryung Choi
- Functional Genomics Research Center, KRIBB, Daejeon, 305-806, Republic of Korea
| | - Anna Park
- Functional Genomics Research Center, KRIBB, Daejeon, 305-806, Republic of Korea
| | - Baek Soo Han
- Functional Genomics Research Center, KRIBB, Daejeon, 305-806, Republic of Korea; Department of Functional Genomics, University of Science and Technology of Korea, Daejeon, 305-806, Republic of Korea
| | - Seung-Wook Chi
- Functional Genomics Research Center, KRIBB, Daejeon, 305-806, Republic of Korea
| | - Seung Jun Kim
- Functional Genomics Research Center, KRIBB, Daejeon, 305-806, Republic of Korea
| | - Kwang-Hee Bae
- Functional Genomics Research Center, KRIBB, Daejeon, 305-806, Republic of Korea; Department of Functional Genomics, University of Science and Technology of Korea, Daejeon, 305-806, Republic of Korea.
| | - Sang Chul Lee
- Functional Genomics Research Center, KRIBB, Daejeon, 305-806, Republic of Korea; Department of Functional Genomics, University of Science and Technology of Korea, Daejeon, 305-806, Republic of Korea.
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Son MJ, Kim WK, Kwak M, Oh KJ, Chang WS, Min JK, Lee SC, Song NW, Bae KH. Silica nanoparticles inhibit brown adipocyte differentiation via regulation of p38 phosphorylation. NANOTECHNOLOGY 2015; 26:435101. [PMID: 26437254 DOI: 10.1088/0957-4484/26/43/435101] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nanoparticles are of great interest due to their wide variety of biomedical and bioengineering applications. However, they affect cellular differentiation and/or intracellular signaling when applied and exposed to target organisms or cells. The brown adipocyte is a cell type important in energy homeostasis and thus closely related to obesity. In this study, we assessed the effects of silica nanoparticles (SNPs) on brown adipocyte differentiation. The results clearly showed that brown adipocyte differentiation was significantly repressed by exposure to SNPs. The brown adipocyte-specific genes as well as mitochondrial content were also markedly reduced. Additionally, SNPs led to suppressed p38 phosphorylation during brown adipocyte differentiation. These effects depend on the size of SNPs. Taken together, these results lead us to suggest that SNP has anti-brown adipogenic effect in a size-dependent manner via regulation of p38 phosphorylation.
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Affiliation(s)
- Min Jeong Son
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea
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Hong JY, Oh IH, McCrea PD. Phosphorylation and isoform use in p120-catenin during development and tumorigenesis. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1863:102-14. [PMID: 26477567 DOI: 10.1016/j.bbamcr.2015.10.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Revised: 10/12/2015] [Accepted: 10/13/2015] [Indexed: 12/12/2022]
Abstract
P120-catenin is essential to vertebrate development, modulating cadherin and small-GTPase functions, and growing evidence points also to roles in the nucleus. A complexity in addressing p120-catenin's functions is its many isoforms, including optional splicing events, alternative points of translational initiation, and secondary modifications. In this review, we focus upon how choices in the initiation of protein translation, or the earlier splicing of the RNA transcript, relates to primary sequences that harbor established or putative regulatory phosphorylation sites. While certain p120 phosphorylation events arise via known kinases/phosphatases and have defined outcomes, in most cases the functional consequences are still to be established. In this review, we provide examples of p120-isoforms as they relate to phosphorylation events, and thereby to isoform dependent protein-protein associations and downstream functions. We also provide a view of upstream pathways that determine p120's phosphorylation state, and that have an impact upon development and disease. Because other members of the p120 subfamily undergo similar processing and phosphorylation, as well as related catenins of the plakophilin subfamily, what is learned regarding p120 will by extension have wide relevance in vertebrates.
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Affiliation(s)
- Ji Yeon Hong
- Division of Cardiology, Department of Medicine, Severance Biomedical Science Institute, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-752, Republic of Korea.
| | - Il-Hoan Oh
- The Catholic University of Korea, Catholic High Performance Cell Therapy Center, 505 Banpo-dong, Seocho-Ku, Seoul 137-701, Republic of Korea
| | - Pierre D McCrea
- Department of Genetics, University of Texas MD Anderson Cancer Center, University of Texas Graduate School of Biomedical Science, Houston, TX 77030, USA.
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Kim EY, Kim WK, Oh KJ, Han BS, Lee SC, Bae KH. Recent advances in proteomic studies of adipose tissues and adipocytes. Int J Mol Sci 2015; 16:4581-99. [PMID: 25734986 PMCID: PMC4394436 DOI: 10.3390/ijms16034581] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 12/29/2014] [Accepted: 02/16/2015] [Indexed: 12/27/2022] Open
Abstract
Obesity is a chronic disease that is associated with significantly increased levels of risk of a number of metabolic disorders. Despite these enhanced health risks, the worldwide prevalence of obesity has increased dramatically over the past few decades. Obesity is caused by the accumulation of an abnormal amount of body fat in adipose tissue, which is composed mostly of adipocytes. Thus, a deeper understanding of the regulation mechanism of adipose tissue and/or adipocytes can provide a clue for overcoming obesity-related metabolic diseases. In this review, we describe recent advances in the study of adipose tissue and/or adipocytes, focusing on proteomic approaches. In addition, we suggest future research directions for proteomic studies which may lead to novel treatments of obesity and obesity-related diseases.
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Affiliation(s)
- Eun Young Kim
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
| | - Won Kon Kim
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
- Department of Functional Genomics, University of Science and Technology of Korea, Daejeon 305-806, Korea.
| | - Kyoung-Jin Oh
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
| | - Baek Soo Han
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
- Department of Functional Genomics, University of Science and Technology of Korea, Daejeon 305-806, Korea.
| | - Sang Chul Lee
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
- Department of Functional Genomics, University of Science and Technology of Korea, Daejeon 305-806, Korea.
| | - Kwang-Hee Bae
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
- Department of Functional Genomics, University of Science and Technology of Korea, Daejeon 305-806, Korea.
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Kim JW, Kim EY, Kim SY, Byun SK, Lee D, Oh KJ, Kim WK, Han BS, Chi SW, Lee SC, Bae KH. Identification of DNA aptamers toward epithelial cell adhesion molecule via cell-SELEX. Mol Cells 2014; 37:742-6. [PMID: 25266702 PMCID: PMC4213765 DOI: 10.14348/molcells.2014.0208] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 08/12/2014] [Accepted: 08/18/2014] [Indexed: 02/07/2023] Open
Abstract
The epithelial cell adhesion molecule (EpCAM, also known as CD326) is a transmembrane glycoprotein that is specifically detected in most adenocarcinomas and cancer stem cells. In this study, we performed a Cell systematic evolution of ligands by exponential enrichment (SELEX) experiment to isolate the aptamers against EpCAM. After seven round of Cell SELEX, we identified several aptamer candidates. Among the selected aptamers, EP166 specifically binds to cells expressing EpCAM with an equilibrium dissociation constant (Kd) in a micromolar range. On the other hand, it did not bind to negative control cells. Moreover, EP166 binds to J1ES cells, a mouse embryonic stem cell line. Therefore, the isolated aptamers against EpCAM could be used as a stem cell marker or in other applications in both stem cell and cancer studies.
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Affiliation(s)
- Ji Won Kim
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
- Department of Functional Genomics, University of Science and Technology (UST) of Korea, Daejeon 305-806,
Korea
| | - Eun Young Kim
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
| | - Sun Young Kim
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
| | - Sang Kyung Byun
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
- Department of Functional Genomics, University of Science and Technology (UST) of Korea, Daejeon 305-806,
Korea
| | - Dasom Lee
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
- Department of Functional Genomics, University of Science and Technology (UST) of Korea, Daejeon 305-806,
Korea
| | - Kyoung-Jin Oh
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
| | - Won Kon Kim
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
| | - Baek Soo Han
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
- Department of Functional Genomics, University of Science and Technology (UST) of Korea, Daejeon 305-806,
Korea
| | - Seung-Wook Chi
- Medical Proteomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
| | - Sang Chul Lee
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
- Department of Functional Genomics, University of Science and Technology (UST) of Korea, Daejeon 305-806,
Korea
| | - Kwang-Hee Bae
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806,
Korea
- Department of Functional Genomics, University of Science and Technology (UST) of Korea, Daejeon 305-806,
Korea
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Choi HR, Kim WK, Park A, Jung H, Han BS, Lee SC, Bae KH. Protein tyrosine phosphatase profiling studies during brown adipogenic differentiation of mouse primary brown preadipocytes. BMB Rep 2014; 46:539-43. [PMID: 24152912 PMCID: PMC4133841 DOI: 10.5483/bmbrep.2013.46.11.058] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 03/16/2013] [Accepted: 03/31/2013] [Indexed: 11/20/2022] Open
Abstract
There is a correlation between obesity and the amount of brown adipose tissue; however, the molecular mechanism of brown adipogenic differentiation has not been as extensively studied. In this study, we performed a protein tyrosine phosphatase (PTP) profiling analysis during the brown adipogenic differentiation of mouse primary brown preadipocytes. Several PTPs, including PTPRF, PTPRZ, and DUSP12 showing differential expression patterns were identified. In the case of DUSP12, the expression level is dramatically downregulated during brown adipogenesis. The ectopic expression of DUSP12 using a retroviral expression system induces the suppression of adipogenic differentiation, whereas a catalytic inactive DUSP12 mutant showed no effect on differentiation. These results suggest that DUSP12 is involved in brown adipogenic differentiation and may be used as a target protein for the treatment or prevention of obesity by the regulation of brown adipogenic differentiation.
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Affiliation(s)
- Hye-Ryung Choi
- Research Center for Integrated Cellulomics, KRIBB; Department of Functional Genomics, University of Science and Technology (UST), Daejeon 305-806, Korea
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Kim EY, Kim JW, Kim WK, Han BS, Park SG, Chung BH, Lee SC, Bae KH. Selection of aptamers for mature white adipocytes by cell SELEX using flow cytometry. PLoS One 2014; 9:e97747. [PMID: 24844710 PMCID: PMC4028271 DOI: 10.1371/journal.pone.0097747] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 04/23/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Adipose tissue, mainly composed of adipocytes, plays an important role in metabolism by regulating energy homeostasis. Obesity is primarily caused by an abundance of adipose tissue. Therefore, specific targeting of adipose tissue is critical during the treatment of obesity, and plays a major role in overcoming it. However, the knowledge of cell-surface markers specific to adipocytes is limited. METHODS AND RESULTS We applied the CELL SELEX (Systematic Evolution of Ligands by EXponential enrichment) method using flow cytometry to isolate molecular probes for specific recognition of adipocytes. The aptamer library, a mixture of FITC-tagged single-stranded random DNAs, is used as a source for acquiring molecular probes. With the increasing number of selection cycles, there was a steady increase in the fluorescence intensity toward mature adipocytes. Through 12 rounds of SELEX, enriched aptamers showing specific recognition toward mature 3T3-L1 adipocyte cells were isolated. Among these, two aptamers (MA-33 and 91) were able to selectively bind to mature adipocytes with an equilibrium dissociation constant (Kd) in the nanomolar range. These aptamers did not bind to preadipocytes or other cell lines (such as HeLa, HEK-293, or C2C12 cells). Additionally, it was confirmed that MA-33 and 91 can distinguish between mature primary white and primary brown adipocytes. CONCLUSIONS These selected aptamers have the potential to be applied as markers for detecting mature white adipocytes and monitoring adipogenesis, and could emerge as an important tool in the treatment of obesity.
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Affiliation(s)
- Eun Young Kim
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
| | - Ji Won Kim
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
- Department of Functional Genomics, University of Science and Technology (UST) of Korea, Daejeon, Republic of Korea
| | - Won Kon Kim
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
| | - Baek Soo Han
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
| | - Sung Goo Park
- Medical Proteomics Research Center, KRIBB, Daejeon, Republic of Korea
| | - Bong Hyun Chung
- BioNanotechnology Research Center, Bioconvergence Research Institute, KRIBB, Daejeon, Republic of Korea
| | - Sang Chul Lee
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
- Department of Functional Genomics, University of Science and Technology (UST) of Korea, Daejeon, Republic of Korea
| | - Kwang-Hee Bae
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
- Department of Functional Genomics, University of Science and Technology (UST) of Korea, Daejeon, Republic of Korea
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Acceleration of adipogenic differentiation via acetylation of malate dehydrogenase 2. Biochem Biophys Res Commun 2013; 441:77-82. [PMID: 24134846 DOI: 10.1016/j.bbrc.2013.10.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Accepted: 10/05/2013] [Indexed: 02/04/2023]
Abstract
Previously, we identified proteins showing a differential acetylation pattern during adipogenic differentiation. Here, we examined the role of malate dehydrogenase 2 (MDH2) acetylation in the adipogenesis of 3T3-L1 preadipocytes. The acetylation level of MDH2 showed a dramatic increase during adipogenesis. The overexpression of wild-type MDH2 induced the significant acceleration of adipogenic differentiation. On the other hand, the acetylation-block mutant MDH2 showed significantly reduced adipogenic differentiation compared to the wild type. MDH2 acetylation enhances its enzymatic activity and consequently intracellular NADPH level. These results suggest that the acetylation of MDH2 was affected by the cellular energy state and subsequently regulated adipogenic differentiation.
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Kamal AHM, Kim WK, Cho K, Park A, Min JK, Han BS, Park SG, Lee SC, Bae KH. Investigation of adipocyte proteome during the differentiation of brown preadipocytes. J Proteomics 2013; 94:327-36. [PMID: 24129212 DOI: 10.1016/j.jprot.2013.10.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 09/02/2013] [Accepted: 10/01/2013] [Indexed: 02/07/2023]
Abstract
UNLABELLED Brown adipocytes oxidize fatty acids to produce heat in response to cold or caloric overfeeding. The motivation and function of the development of brown fat may thus counteract obesity, though this remains uncertain. We investigated the brown adipocyte proteome by two-dimensional gel electrophoresis followed by mass spectrometry. Comparative analyses of proteins focused on total protein spots to filter differentially expressed proteins during the differentiation of mouse primary brown preadipocytes. A Western blot analysis was performed to verify the target proteins. The results indicated that 10 protein spots were differentially expressed with significant changes, including the three up-regulated proteins of prohibitin, hypoxanthine-guanine phosphoribosyltransferase, and enoyl-CoA hydratase protein; the 5 down-regulated proteins of triosephosphate isomerase, elongation factor 2, α-tropomyosin slow, endophilin-B1, and cofilin-1 (CFL1); and the two unequivocally expressed proteins of peroxiredoxin-1 and collagen α-1(i) chain precursor. We found that during brown adipogenesis, CFL1 has an inhibitory effect on brown adipocyte differentiation. The overexpression of CFL1 inhibited the brown fat deposition and repressed the brown marker genes UCP1, PRDM16, PGC-1α and PPARγ via actin dynamics and polymerization. These observations may be novel findings that bring new insight into the detailed mechanisms of brown adipogenesis and identify possible therapeutic targets for anti-obesity. BIOLOGICAL SIGNIFICANCE We use 2-DE to compare the proteomes of adipocytes during the brown adipogenesis of primary mouse preadipocytes. We identified 10 proteins that are differentially expressed. Among these, we found that the actin binding protein CFL1 inhibits the differentiation of brown preadipocytes. CFL1 overexpressing cells showed lower deposition of brown fat droplets, and the brown marker genes of UCP1, PRDM16, PGC-1α and PPARγ were decreased through actin dynamics and polymerization.
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Affiliation(s)
- Abu Hena Mostafa Kamal
- Research Center for Integrated Cellulomics, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 305-806, Republic of Korea
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14
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Choi HR, Kim WK, Kim EY, Han BS, Min JK, Chi SW, Park SG, Bae KH, Lee SC. Dual-specificity phosphatase 10 controls brown adipocyte differentiation by modulating the phosphorylation of p38 mitogen-activated protein kinase. PLoS One 2013; 8:e72340. [PMID: 23977283 PMCID: PMC3748012 DOI: 10.1371/journal.pone.0072340] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 07/09/2013] [Indexed: 11/23/2022] Open
Abstract
Background Brown adipocytes play an important role in regulating the balance of energy, and as such, there is a strong correlation between obesity and the amount of brown adipose tissue. Although the molecular mechanism underlying white adipocyte differentiation has been well characterized, brown adipocyte differentiation has not been studied extensively. Here, we investigate the potential role of dual-specificity phosphatase 10 (DUSP10) in brown adipocyte differentiation using primary brown preadipocytes. Methods and Results The expression of DUSP10 increased continuously after the brown adipocyte differentiation of mouse primary brown preadipocytes, whereas the phosphorylation of p38 was significantly upregulated at an early stage of differentiation followed by steep downregulation. The overexpression of DUSP10 induced a decrease in the level of p38 phosphorylation, resulting in lower lipid accumulation than that in cells overexpressing the inactive mutant DUSP10. The expression levels of several brown adipocyte markers such as PGC-1α, UCP1, and PRDM16 were also significantly reduced upon the ectopic expression of DUSP10. Furthermore, decreased mitochondrial DNA content was detected in cells expressing DUSP10. The results obtained upon treatment with the p38 inhibitor, SB203580, clearly indicated that the phosphorylation of p38 at an early stage is important in brown adipocyte differentiation. The effect of the p38 inhibitor was partially recovered by DUSP10 knockdown using RNAi. Conclusions These results suggest that p38 phosphorylation is controlled by DUSP10 expression. Furthermore, p38 phosphorylation at an early stage is critical in brown adipocyte differentiation. Thus, the regulation of DUSP10 activity affects the efficiency of brown adipogenesis. Consequently, DUSP10 can be used as a novel target protein for the regulation of obesity.
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Affiliation(s)
- Hye-Ryung Choi
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
| | - Won Kon Kim
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
| | - Eun Young Kim
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
| | - Baek Soo Han
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
- Department of Functional Genomics, University of Science and Technology (UST), Daejeon, Republic of Korea
| | - Jeong-Ki Min
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
- Department of Functional Genomics, University of Science and Technology (UST), Daejeon, Republic of Korea
| | - Seung-Wook Chi
- Biomedical Proteomics Research Center, KRIBB, Daejeon, Republic of Korea
| | - Sung Goo Park
- Biomedical Proteomics Research Center, KRIBB, Daejeon, Republic of Korea
| | - Kwang-Hee Bae
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
- Department of Functional Genomics, University of Science and Technology (UST), Daejeon, Republic of Korea
- * E-mail: (KHB); (SCL)
| | - Sang Chul Lee
- Research Center for Integrated Cellulomics, KRIBB, Daejeon, Republic of Korea
- Department of Functional Genomics, University of Science and Technology (UST), Daejeon, Republic of Korea
- * E-mail: (KHB); (SCL)
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Bae KH, Kim WK, Lee SC. Involvement of protein tyrosine phosphatases in adipogenesis: new anti-obesity targets? BMB Rep 2013; 45:700-6. [PMID: 23261055 PMCID: PMC4133817 DOI: 10.5483/bmbrep.2012.45.12.235] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Obesity is a worldwide epidemic as well as being a major risk factor for diabetes, cardiovascular diseases and several types of cancers. Obesity is mainly due to the overgrowth of adipose tissue arising from an imbalance between energy intake and energy expenditure. Adipose tissue, primarily composed of adipocytes, plays a key role in maintaining whole body energy homeostasis. In view of the treatment of obesity and obesity-related diseases, it is critical to understand the detailed signal transduction mechanisms of adipogenic differentiation. Adipogenic differentiation is tightly regulated by many key signal cascades, including insulin signaling. These signal cascades generally transfer or amplify the signal by using serial tyrosine phosphorylations. Thus, protein tyrosine kinases and protein tyrosine phosphatases are closely related to adipogenic differentiation. Compared to protein tyrosine kinases, protein tyrosine phosphatases have received little attention in adipogenic differentiation. This review aims to highlight the involvement of protein tyrosine phosphatases in adipogenic differentiation and the possibility of protein tyrosine phosphatases as drugs to target obesity. [BMB Reports 2012; 45(12): 700-706]
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Affiliation(s)
- Kwang-Hee Bae
- Medical Proteomics Research Center, KRIBB, Daejeon 305-806, Korea.
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16
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Kim DM, Choi HR, Park A, Shin SM, Bae KH, Lee SC, Kim IC, Kim WK. Retinoic acid inhibits adipogenesis via activation of Wnt signaling pathway in 3T3-L1 preadipocytes. Biochem Biophys Res Commun 2013; 434:455-9. [PMID: 23583383 DOI: 10.1016/j.bbrc.2013.03.095] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Accepted: 03/27/2013] [Indexed: 01/29/2023]
Abstract
Although retinoic acid (RA) is well known to inhibit the differentiation of 3T3-L1 cells into adipocytes both in vivo and in vitro, its molecular mechanism is not fully understood. In this report, we investigate the inhibitory mechanism of adipocyte differentiation by RA in 3T3-L1 cells. Because both RA and Wnt are known to inhibit adipogenesis at a common step involving the inhibition of PPAR-γ expression, we focused on the crosstalk between these two signaling pathways. We found that RA treatment resulted in a dramatic inhibition of adipogenesis, especially at an early phase of differentiation, and led to increased β-catenin protein expression. Moreover, RA enhances the transcriptional activity of β-catenin as well as Wnt gene expression during adipogenesis. Taken together, the present study demonstrated that Wnt/β-catenin signaling may be associated with the RA-induced suppression of adipogenesis and may cooperatively inhibit adipocyte differentiation.
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Affiliation(s)
- Dong Min Kim
- Department of Medical System Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea
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Kim EY, Kim WK, Kang HJ, Kim JH, Chung SJ, Seo YS, Park SG, Lee SC, Bae KH. Acetylation of malate dehydrogenase 1 promotes adipogenic differentiation via activating its enzymatic activity. J Lipid Res 2012; 53:1864-76. [PMID: 22693256 DOI: 10.1194/jlr.m026567] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Acetylation is one of the most crucial post-translational modifications that affect protein function. Protein lysine acetylation is catalyzed by acetyltransferases, and acetyl-CoA functions as the source of the acetyl group. Additionally, acetyl-CoA plays critical roles in maintaining the balance between carbohydrate metabolism and fatty acid synthesis. Here, we sought to determine whether lysine acetylation is an important process for adipocyte differentiation. Based on an analysis of the acetylome during adipogenesis, various proteins displaying significant quantitative changes were identified by LC-MS/MS. Of these identified proteins, we focused on malate dehydrogenase 1 (MDH1). The acetylation level of MDH1 was increased up to 6-fold at the late stage of adipogenesis. Moreover, overexpression of MDH1 in 3T3-L1 preadipocytes induced a significant increase in the number of cells undergoing adipogenesis. The introduction of mutations to putative lysine acetylation sites showed a significant loss of the ability of cells to undergo adipogenic differentiation. Furthermore, the acetylation of MDH1 dramatically enhanced its enzymatic activity and subsequently increased the intracellular levels of NADPH. These results clearly suggest that adipogenic differentiation may be regulated by the acetylation of MDH1 and that the acetylation of MDH1 is one of the cross-talk mechanisms between adipogenesis and the intracellular energy level.
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Affiliation(s)
- Eun Young Kim
- Department of Biological Sciences, KAIST, Daejeon 305-701, Republic of Korea
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Kim WK, Choi HR, Park SG, Ko Y, Bae KH, Lee SC. Myostatin inhibits brown adipocyte differentiation via regulation of Smad3-mediated β-catenin stabilization. Int J Biochem Cell Biol 2011; 44:327-34. [PMID: 22094186 DOI: 10.1016/j.biocel.2011.11.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2011] [Revised: 11/02/2011] [Accepted: 11/02/2011] [Indexed: 12/17/2022]
Abstract
Brown adipocytes play an important role in regulating energy balance, and there is a good correlation between obesity and the amount of brown adipose tissue. Although the molecular mechanism of white adipocyte differentiation has been well characterized, brown adipogenesis has not been studied extensively. Moreover, extracellular factors that regulate brown adipogenic differentiation are not fully understood. Here, we assessed the mechanism of the regulatory action of myostatin in brown adipogenic differentiation using primary brown preadipocytes. Our results clearly showed that differentiation of brown adipocytes was significantly inhibited by myostatin treatment. In addition, myostatin-induced suppression of brown adipogenesis was observed during the early phase of differentiation. Myostatin induced the phosphorylation of Smad3, which led to increased β-catenin stabilization. These effects were blocked by treatment with a Smad3 inhibitor. Expression of brown adipocyte-related genes, such as PPAR-γ, UCP-1, PGC-1α, and PRDM16, were dramatically down-regulated by treatment with myostatin, and further down-regulated by co-treatment with a β-catenin activator. Taken together, the present study demonstrated that myostatin is a potent negative regulator of brown adipogenic differentiation by modulation of Smad3-induced β-catenin stabilization. Our findings suggest that myostatin could be used as an extracellular factor in the control of brown adipocyte differentiation.
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Affiliation(s)
- Won Kon Kim
- Medical Proteomics Research Center, KRIBB, Daejeon 305-806, Republic of Korea
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