1
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Zhang C, Yang X, Wu L, Liu F, Dong K, Guo C, Gong L, Dong G, Shi Y, Gu Z, Liu X, Liu S, Wu J, Su F. Site-Specifically Modified Peptide Inhibitors of Protein Tyrosine Phosphatase 1B and T-Cell Protein Tyrosine Phosphatase with Enhanced Stability and Improved In Vivo Long-Acting Activity. ACS Pharmacol Transl Sci 2024; 7:1426-1437. [PMID: 38751623 PMCID: PMC11091969 DOI: 10.1021/acsptsci.4c00054] [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: 02/02/2024] [Revised: 04/01/2024] [Accepted: 04/09/2024] [Indexed: 05/18/2024]
Abstract
Protein tyrosine phosphatase 1B (PTP1B) and TC-PTP can function in a coordinated manner to regulate diverse biological processes including insulin and leptin signaling, T-cell activation, and tumor antigen presentation, which makes them potential targets for several therapeutic applications. We have previously demonstrated that the lipidated BimBH3 peptide analogues were a new class of promising PTP1B inhibitors with once-weekly antidiabetic potency. Herein, we chemically synthesized two series of BimBH3 analogues via site-specific modification and studied their structure-activity relationship. The screened analogues S2, S6, A2-14, A2-17, A2-20, and A2-21 exhibited an improved PTP1B/TC-PTP dual inhibitory activity and achieved good stability in the plasma of mice and dogs, which indicated long-acting potential. In mouse models of type 2 diabetes mellitus (T2DM), the selected analogues S6, S7, A2-20, and A2-21 with an excellent target activity and plasma stability generated once-weekly therapeutic potency for T2DM at lower dosage (0.5 μmol/kg). In addition, evidence was provided to confirm the cell permeability and targeted enrichment of the BimBH3 analogues. In summary, we report here that site-specific modification and long fatty acid conjugation afforded cell-permeable peptidomimetic analogues of BimBH3 with enhanced stability, in vivo activity, and long-acting pharmacokinetic profile. Our findings could guide the further optimization of BimBH3 analogues and provide a proof-of-concept for PTP1B/TC-PTP targeting as a new therapeutic approach for T2DM, which may facilitate the discovery and development of alternative once-weekly anti-T2DM drug candidates.
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Affiliation(s)
- Chuanliang Zhang
- State
Key Laboratory Base of Eco-chemical Engineering, College of Chemical
Engineering, Qingdao University of Science
and Technology, Qingdao 266042, China
- School
of Medicine and Pharmacy, Ocean University
of China, Qingdao 266003, China
- Marine
Biomedical Research Institute, Ocean University
of China, Qingdao 266003, China
| | - Xianmin Yang
- State
Key Laboratory Base of Eco-chemical Engineering, College of Chemical
Engineering, Qingdao University of Science
and Technology, Qingdao 266042, China
| | - Lijuan Wu
- School
of Medicine and Pharmacy, Ocean University
of China, Qingdao 266003, China
- Marine
Biomedical Research Institute, Ocean University
of China, Qingdao 266003, China
| | - Fei Liu
- Joincare
Pharmaceutical Group Industry Co., Ltd, Shenzhen 518000, China
| | - Kehong Dong
- State
Key Laboratory Base of Eco-chemical Engineering, College of Chemical
Engineering, Qingdao University of Science
and Technology, Qingdao 266042, China
| | - Chuanlong Guo
- State
Key Laboratory Base of Eco-chemical Engineering, College of Chemical
Engineering, Qingdao University of Science
and Technology, Qingdao 266042, China
| | - Liyan Gong
- State
Key Laboratory Base of Eco-chemical Engineering, College of Chemical
Engineering, Qingdao University of Science
and Technology, Qingdao 266042, China
| | - Guozhen Dong
- State
Key Laboratory Base of Eco-chemical Engineering, College of Chemical
Engineering, Qingdao University of Science
and Technology, Qingdao 266042, China
| | - Yiying Shi
- State
Key Laboratory Base of Eco-chemical Engineering, College of Chemical
Engineering, Qingdao University of Science
and Technology, Qingdao 266042, China
| | - Zongwen Gu
- State
Key Laboratory Base of Eco-chemical Engineering, College of Chemical
Engineering, Qingdao University of Science
and Technology, Qingdao 266042, China
| | - Xiaochun Liu
- School
of Medicine and Pharmacy, Ocean University
of China, Qingdao 266003, China
- Marine
Biomedical Research Institute, Ocean University
of China, Qingdao 266003, China
| | - Shan Liu
- Marine
Biomedical Research Institute, Ocean University
of China, Qingdao 266003, China
| | - Juan Wu
- Marine
Biomedical Research Institute, Ocean University
of China, Qingdao 266003, China
| | - Feng Su
- State
Key Laboratory Base of Eco-chemical Engineering, College of Chemical
Engineering, Qingdao University of Science
and Technology, Qingdao 266042, China
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2
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Datta R, Mukherjee D, Podolsky MJ, Yang CD, Alba DL, Singh S, Arnold TD, Koliwad S, Lizama CO, Atabai K. PTP1B mediates the inhibitory effect of MFGE8 on insulin signaling through the β5 integrin. J Biol Chem 2024; 300:105631. [PMID: 38199575 PMCID: PMC10850974 DOI: 10.1016/j.jbc.2024.105631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 12/14/2023] [Accepted: 12/27/2023] [Indexed: 01/12/2024] Open
Abstract
Integrins are cell adhesion receptors that dimerize to mediate cell-cell interactions and regulate processes, including proliferation, inflammation, and tissue repair. The role of integrins in regulating insulin signaling is incompletely understood. We have previously shown that binding of the integrin ligand milk fat globule epidermal growth factor like 8 (MFGE8) to the αvβ5 integrin promotes termination of insulin receptor signaling in mice. Upon ligation of MFGE8, integrin β5 complexes with the insulin receptor beta (IRβ) in skeletal muscle, resulting in dephosphorylation of IRβ and reduction of insulin-stimulated glucose uptake. Here, we investigate the mechanism by which the interaction between β5 and IRβ impacts IRβ phosphorylation status. We show in in vitro and in vivo in skeletal muscle in mice that antibody-mediated blockade of the β5 integrin inhibits and recombinant MFGE8 promotes PTP1B binding to and dephosphorylation of IRβ resulting in increased or reduced insulin-stimulated glucose uptake, respectively. The β5-PTP1B complex is recruited by MFGE8 to IRβ leading to termination of canonical insulin signaling. β5 blockade enhances insulin-stimulated glucose uptake in wildtype but not Ptp1b KO mice indicating that PTP1B functions downstream of MFGE8 in modulating insulin receptor signaling. Furthermore, in a human cohort, we report serum MFGE8 levels correlate with indices of insulin resistance. These data provide mechanistic insights into the role of MFGE8 and β5 in regulating insulin signaling.
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Affiliation(s)
- Ritwik Datta
- Cardiovascular Research Institute, University of California, San Francisco, California, USA
| | - Dibyanti Mukherjee
- Department of Pediatrics, University of California, San Francisco, California, USA
| | - Michael J Podolsky
- Cardiovascular Research Institute, University of California, San Francisco, California, USA
| | - Christopher D Yang
- Cardiovascular Research Institute, University of California, San Francisco, California, USA
| | - Diana L Alba
- Diabetes Center, University of California, San Francisco, California, USA; Division of Endocrinology, Department of Medicine, University of California, San Francisco, California, USA
| | - Sukhmani Singh
- Division of Endocrinology, Department of Medicine, University of California, San Francisco, California, USA
| | - Thomas D Arnold
- Department of Pediatrics, University of California, San Francisco, California, USA
| | - Suneil Koliwad
- Diabetes Center, University of California, San Francisco, California, USA; Division of Endocrinology, Department of Medicine, University of California, San Francisco, California, USA
| | - Carlos O Lizama
- Cardiovascular Research Institute, University of California, San Francisco, California, USA
| | - Kamran Atabai
- Cardiovascular Research Institute, University of California, San Francisco, California, USA; Diabetes Center, University of California, San Francisco, California, USA; Lung Biology Center, University of California, San Francisco, California, USA.
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3
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Datta R, Podolsky MJ, Yang CD, Alba DL, Singh S, Koliwad S, Lizama CO, Atabai K. MFGE8 inhibits insulin signaling through PTP1B. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.30.542928. [PMID: 37398282 PMCID: PMC10312531 DOI: 10.1101/2023.05.30.542928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
The role of integrins in regulating insulin signaling is incompletely understood. We have previously shown that binding of the integrin ligand milk fat globule epidermal growth factor like 8 (MFGE8) to the αvβ5 integrin promotes termination of insulin receptor signaling in mice. Upon ligation of MFGE8, β5 complexes with the insulin receptor beta (IRβ) in skeletal muscle resulting in dephosphorylation of IRβ and reduction of insulin-stimulated glucose uptake. Here we investigate the mechanism by which the interaction between β5 and IRβ impacts IRβ phosphorylation status. We show that β5 blockade inhibits and MFGE8 promotes PTP1B binding to and dephosphorylation of IRβ resulting in reduced or increased insulin-stimulated myotube glucose uptake respectively. The β5-PTP1B complex is recruited by MFGE8 to IRβ leading to termination of canonical insulin signaling. β5 blockade enhances insulin-stimulated glucose uptake in wild type but not Ptp1b KO mice indicating that PTP1B functions downstream of MFGE8 in modulating insulin receptor signaling. Furthermore, in a human cohort, we report serum MFGE8 levels correlate with indices of insulin resistance. These data provide mechanistic insights into the role of MFGE8 and β5 in regulating insulin signaling.
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Affiliation(s)
- Ritwik Datta
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158
| | - Michael J Podolsky
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158
| | - Christopher D Yang
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158
| | - Diana L. Alba
- Diabetes Center, University of California, San Francisco, CA 94143
- Divisions of Endocrinology, Department of Medicine, University of California, San Francisco, CA 94143
| | - Sukhmani Singh
- Divisions of Endocrinology, Department of Medicine, University of California, San Francisco, CA 94143
| | - Suneil Koliwad
- Diabetes Center, University of California, San Francisco, CA 94143
- Divisions of Endocrinology, Department of Medicine, University of California, San Francisco, CA 94143
| | - Carlos O Lizama
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158
| | - Kamran Atabai
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158
- Diabetes Center, University of California, San Francisco, CA 94143
- Lung Biology Center, University of California, San Francisco, CA 94158
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4
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Zhang C, Yang X, Meng X, Wu L, Liu X, Gao J, Liu S, Wu J, Huang D, Wang Z, Su X. Discovery of Novel PTP1B Inhibitors with Once-Weekly Therapeutic Potential for Type 2 Diabetes: Design, Synthesis, and In Vitro and In Vivo Investigations of BimBH3 Peptide Analogues. J Med Chem 2023; 66:3030-3044. [PMID: 36749220 DOI: 10.1021/acs.jmedchem.2c02003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Poor medication adherence in patients with type 2 diabetes mellitus has become one of the main causes of suboptimal glycemic control. Once-weekly drugs can markedly improve the convenience, adherence, and quality of life of T2DM patients; thus, they are clinically needed and preferred. PTP1B plays a negative role in both insulin and leptin signaling pathways, which makes it an important target for diabetes. Herein, we design and synthesize 35 analogues of core BimBH3 peptide via lipidation/acylation strategy based on our previous work and evaluate their PTP1B inhibitory activity, obtaining the primary structure-activity relationship. Five compounds with good PPT1B inhibitory activity, target selectivity, and significantly improved stability were selected for molecular docking study and searching candidate molecules with long-acting antidiabetic potential. The in vivo anti-T2DM evaluation validated the once-weekly therapeutic potential of analogues 19, 26, 27, 31, and 33, which were comparable with semaglutide and therefore presented as promising drug candidates.
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Affiliation(s)
- Chuanliang Zhang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.,School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Xianmin Yang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Xinjia Meng
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Lijuan Wu
- School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Marine Biomedical Research Institute, Ocean University of China, Qingdao 266071, China
| | - Xiaochun Liu
- School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Marine Biomedical Research Institute, Ocean University of China, Qingdao 266071, China
| | - Jiangming Gao
- Marine Biomedical Research Institute, Ocean University of China, Qingdao 266071, China
| | - Shan Liu
- Marine Biomedical Research Institute, Ocean University of China, Qingdao 266071, China
| | - Juan Wu
- Marine Biomedical Research Institute, Ocean University of China, Qingdao 266071, China
| | - Dingmin Huang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Zhenwei Wang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Xianbin Su
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
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5
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Teimouri M, Hosseini H, ArabSadeghabadi Z, Babaei-Khorzoughi R, Gorgani-Firuzjaee S, Meshkani R. The role of protein tyrosine phosphatase 1B (PTP1B) in the pathogenesis of type 2 diabetes mellitus and its complications. J Physiol Biochem 2022; 78:307-322. [PMID: 34988903 DOI: 10.1007/s13105-021-00860-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 11/16/2021] [Indexed: 01/16/2023]
Abstract
Insulin resistance, the most important characteristic of the type 2 diabetes mellitus (T2DM), is mostly caused by impairment in the insulin receptor (IR) signal transduction pathway. Protein tyrosine phosphatase 1B (PTP1B), one of the main negative regulators of the IR signaling pathway, is broadly expressed in various cells and tissues. PTP1B decreases the phosphorylation of the IR resulting in insulin resistance in various tissues. The evidence for the physiological role of PTP1B in regulation of metabolic pathways came from whole-body PTP1B-knockout mice. Whole-body and tissue-specific PTP1B-knockout mice showed improvement in adiposity, insulin resistance, and glucose tolerance. In addition, the key role of PTP1B in the pathogenesis of T2DM and its complications was further investigated in mice models of PTP1B deficient/overexpression. In recent years, targeting PTP1B using PTP1B inhibitors is being considered an attractive target to treat T2DM. PTP1B inhibitors improve the sensitivity of the insulin receptor and have the ability to cure insulin resistance-related diseases. We herein summarized the biological functions of PTP1B in different tissues in vivo and in vitro. We also describe the effectiveness of potent PTP1B inhibitors as pharmaceutical agents to treat T2DM.
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Affiliation(s)
- Maryam Teimouri
- Department of Clinical Biochemistry, School of Allied Medical Sciences, Shahroud University of Medical Sciences, Shahroud, Iran
| | - Hossein Hosseini
- Department of Clinical Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Zahra ArabSadeghabadi
- Department of Clinical Sciences, Faculty of Veterinary Science, Bu-Ali Sina University, Hamedan, Iran
| | - Reyhaneh Babaei-Khorzoughi
- Department of Clinical Biochemistry, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Sattar Gorgani-Firuzjaee
- Department of Medical Laboratory Sciences, School of Allied Health Medicine, AJA University of Medical Sciences, Tehran, Iran
| | - Reza Meshkani
- Department of Clinical Biochemistry, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
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6
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Zhang C, Wu L, Liu X, Gao J, Liu S, Wu J, Huang D, Wang Z, Su X. Discovery of Novel PTP1B Inhibitors Derived from the BH3 Domain of Proapoptotic Bcl-2 Proteins with Antidiabetic Potency. ACS Med Chem Lett 2021; 12:1017-1023. [PMID: 34141087 DOI: 10.1021/acsmedchemlett.1c00174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/17/2021] [Indexed: 01/13/2023] Open
Abstract
BH3 peptide analogues are generally believed to exhibit great potency as cancer therapeutics via targeting antiapoptotic Bcl-2 proteins. Here, we describe the synthesis and identification of a new class of palmitoylated peptide BH3 analogues derived from the core region (h1-h4) of BH3 domains of proapoptotic Bcl-2 proteins and as alternative PTP1B inhibitors with antidiabetic potency in vitro and in vivo. PTP1B inhibitors are attractive for treatment of type 2 diabetes. We design the analogues using a simple lipidation approach and discovered novel lead analogues with promising antidiabetic potency in vitro and in vivo. The results presented here expanded the alternative target and function for the BH3 peptide analogues from one member Bim to other members of the proapoptotic Bcl-2 proteins and emphasize their therapeutic potential in T2DM. Furthermore, our findings may provide new proof of the regulatory function of Bcl-2 family proteins in mitochondrial nutrient and energy metabolism.
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Affiliation(s)
- Chuanliang Zhang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
- School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Marine Biomedical Research Institute, Qingdao 266071, China
| | - Lijuan Wu
- School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Marine Biomedical Research Institute, Qingdao 266071, China
| | - Xiaochun Liu
- School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Marine Biomedical Research Institute, Qingdao 266071, China
| | - Jiangming Gao
- School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Marine Biomedical Research Institute, Qingdao 266071, China
| | - Shan Liu
- School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Marine Biomedical Research Institute, Qingdao 266071, China
| | - Juan Wu
- School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Marine Biomedical Research Institute, Qingdao 266071, China
| | - Dingmin Huang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Zhenwei Wang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Xianbin Su
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
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7
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García‐Marín J, Griera M, Sánchez‐Alonso P, Di Geronimo B, Mendicuti F, Rodríguez‐Puyol M, Alajarín R, Pascual‐Teresa B, Vaquero JJ, Rodríguez‐Puyol D. Pyrrolo[1,2‐
a
]quinoxalines: Insulin Mimetics that Exhibit Potent and Selective Inhibition against Protein Tyrosine Phosphatase 1B. ChemMedChem 2020; 15:1788-1801. [DOI: 10.1002/cmdc.202000446] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 07/29/2020] [Indexed: 12/29/2022]
Affiliation(s)
- Javier García‐Marín
- Departamento de Química Orgánica y Química Inorgánica Universidad de Alcalá 28805 Alcalá de Henares Spain
- Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS) Ctra. Colmenar Viejo, km. 9100 28034 Madrid Spain
- Instituto de Investigación Química Andrés M. del Río Facultad de Farmacia Universidad de Alcalá 28805 Alcalá de Henares Spain
| | - Mercedes Griera
- Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS) Ctra. Colmenar Viejo, km. 9100 28034 Madrid Spain
- Departamento de Biología de Sistemas Universidad de Alcalá 28805 Alcalá de Henares Spain
| | - Patricia Sánchez‐Alonso
- Departamento de Química Orgánica y Química Inorgánica Universidad de Alcalá 28805 Alcalá de Henares Spain
| | - Bruno Di Geronimo
- Departamento de Química y Bioquímica Facultad de Farmacia Universidad San Pablo CEU 28925 Alcorcón Spain
| | - Francisco Mendicuti
- Departamento de Química Analítica Química Física e Ingeniería Química Universidad de Alcalá 28805 Alcalá de Henares Spain
- Instituto de Investigación Química Andrés M. del Río Facultad de Farmacia Universidad de Alcalá 28805 Alcalá de Henares Spain
| | - Manuel Rodríguez‐Puyol
- Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS) Ctra. Colmenar Viejo, km. 9100 28034 Madrid Spain
- Departamento de Biología de Sistemas Universidad de Alcalá 28805 Alcalá de Henares Spain
| | - Ramón Alajarín
- Departamento de Química Orgánica y Química Inorgánica Universidad de Alcalá 28805 Alcalá de Henares Spain
- Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS) Ctra. Colmenar Viejo, km. 9100 28034 Madrid Spain
- Instituto de Investigación Química Andrés M. del Río Facultad de Farmacia Universidad de Alcalá 28805 Alcalá de Henares Spain
| | - Beatriz Pascual‐Teresa
- Departamento de Química y Bioquímica Facultad de Farmacia Universidad San Pablo CEU 28925 Alcorcón Spain
| | - Juan J. Vaquero
- Departamento de Química Orgánica y Química Inorgánica Universidad de Alcalá 28805 Alcalá de Henares Spain
- Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS) Ctra. Colmenar Viejo, km. 9100 28034 Madrid Spain
- Instituto de Investigación Química Andrés M. del Río Facultad de Farmacia Universidad de Alcalá 28805 Alcalá de Henares Spain
| | - Diego Rodríguez‐Puyol
- Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS) Ctra. Colmenar Viejo, km. 9100 28034 Madrid Spain
- Departamento de Biología de Sistemas Universidad de Alcalá 28805 Alcalá de Henares Spain
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8
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Recent advance on PTP1B inhibitors and their biomedical applications. Eur J Med Chem 2020; 199:112376. [DOI: 10.1016/j.ejmech.2020.112376] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 04/22/2020] [Accepted: 04/22/2020] [Indexed: 12/17/2022]
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9
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Luo K, Tang Y, Gao X, Tan J, Yu B, Xu J, Luo F. Inhibition of protein-tyrosine phosphatase 1B phosphorylation enhances early adhesion of mesenchymal stem cells to facilitate fabrication of tissue-engineered bone. J Tissue Eng Regen Med 2020; 14:575-587. [PMID: 32061178 DOI: 10.1002/term.3021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 01/29/2020] [Accepted: 02/07/2020] [Indexed: 12/16/2022]
Abstract
Enhancement of cell-matrix adhesion is preferable and crucial in various fields of tissue engineering. Integrins are important receptors that facilitate cell-matrix adhesion, mediated by intracellular molecules and crosstalk with the cadherin adhesion pathway, which mainly facilitates cell-cell adhesion. Protein-tyrosine phosphatase 1B (PTP1B) has emerged as a pivot in the crosstalk between the cadherin adhesion pathway and the integrin adhesion pathway. The phosphorylation state of PTP1B tyrosine-152 (Y152) plays a central role in balancing the two different cell adhesion forms. In this study, a PTP1B Y152 region mimicking (152RM) peptide was designed to decrease the phosphorylation of PTP1B Y152 via competitive inhibition. As a result, the dissociation of cadherin complexes and the release of PTP1B from cadherin had sharply increased, and Src, an important intracellular component of integrin, was activated, indicating that the cadherin adhesion pathway was inhibited, whereas the integrin adhesion pathway was enhanced. Moreover, upon treatment with the 152RM peptide, we observed that the early adhesion of human bone marrow-derived mesenchymal stem cells (MSCs) was accelerated and the anchoring of MSCs on the surface of integrin ligands was enhanced by an enhanced matrix adhesion ability of MSCs themselves. Importantly, the 152RM peptide significantly promoted the adhesion efficiency of MSCs in the selective cell retention technology, which fabricates instant bone implants in clinical settings, to stimulate osteogenesis in vivo.
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Affiliation(s)
- Keyu Luo
- Department of Spine Surgery, Center for Orthopedics, Daping Hospital, Army Medical University, Chongqing, China.,Tissue Engineering Laboratory of Chongqing City, Chongqing, China
| | - Yong Tang
- National & Regional United Engineering Lab of Tissue Engineering, Department of Orthopedics, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,Tissue Engineering Laboratory of Chongqing City, Chongqing, China
| | - Xiaoliang Gao
- National & Regional United Engineering Lab of Tissue Engineering, Department of Orthopedics, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,Tissue Engineering Laboratory of Chongqing City, Chongqing, China
| | - Jiulin Tan
- National & Regional United Engineering Lab of Tissue Engineering, Department of Orthopedics, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,Tissue Engineering Laboratory of Chongqing City, Chongqing, China
| | - Bo Yu
- National & Regional United Engineering Lab of Tissue Engineering, Department of Orthopedics, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,Tissue Engineering Laboratory of Chongqing City, Chongqing, China
| | - Jianzhong Xu
- National & Regional United Engineering Lab of Tissue Engineering, Department of Orthopedics, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,Tissue Engineering Laboratory of Chongqing City, Chongqing, China
| | - Fei Luo
- National & Regional United Engineering Lab of Tissue Engineering, Department of Orthopedics, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,Tissue Engineering Laboratory of Chongqing City, Chongqing, China
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10
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Kunjiappan S, Theivendren P, Pavadai P, Govindaraj S, Sankaranarayanan M, Somasundaram B, Arunachalam S, Ram Kumar Pandian S, Ammunje DN. Design and in silico modeling of Indoloquinoxaline incorporated keratin nanoparticles for modulation of glucose metabolism in 3T3-L1 adipocytes. Biotechnol Prog 2019; 36:e2904. [PMID: 31496124 DOI: 10.1002/btpr.2904] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 08/29/2019] [Accepted: 09/04/2019] [Indexed: 12/25/2022]
Abstract
The following study was done to assess the glucose utilizing efficiency of Indoloquinoxaline derivative incorporated keratin nanoparticles (NPs) in 3T3-L1 adipocytes. Indoloquinoxaline derivative had wide range of biological activities including antidiabetic activity. In this view, Indoloquinoxaline moiety containing N, N-dimethyl (3-fluoro-6H-indolo [3,2-b] quinoxalin-6-yl) methanamine compound was designed and synthesized, and further it is incorporated into keratin nanoparticles. The formulated NPs, drug entrapment efficiency, releasing capacity, stability, and physicochemical properties were characterized by various spectral analyzer and obtained results of characterizations were confirmed the properties of NPs. The analysis of mechanism underlying the glucose utilization of NPs was examined through molecular docking with identified target, and observed in silico study reports shown strong interaction of NPs in the binding pockets of AMPK and PTP1B. Based on the in silico screening, the formulated NPs was performed for in vitro cellular viability and glucose uptake studies on 3T3-L1 adipocytes. Interestingly, 40 μg of NPs displayed 78.2 ± 2.76% cellular viability, and no cell death was observed at lower concentrations. Further, the concentration dependent glucose utilization was observed at different concentrations of NPs in 3T3-L1 adipocytes. The results of NPs (40 μg) on glucose utilization have revealed eminent result 58.56 ± 4.54% compared to that of Metformin (10 μM) and Insulin (10 μM). The identified results clearly indicated that Indoloquinoxaline derivative incorporated keratin NPs significantly increased glucose utilization efficiency and protect the cells against the insulin resistance.
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Affiliation(s)
- Selvaraj Kunjiappan
- Department of Biotechnology, Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu, India
| | | | - Parasuraman Pavadai
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, M S Ramaiah University of Applied Sciences, Bengaluru, Karnataka, India
| | - Saravanan Govindaraj
- Department of Pharmaceutical Chemistry, MNR College of Pharmacy, Sangareddy, Telangana, India
| | | | - Balasubramanian Somasundaram
- Sir CV Raman-KS Krishnan International Research Center, Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu, India
| | - Sankarganesh Arunachalam
- Department of Biotechnology, Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu, India
| | | | - Damodar Nayak Ammunje
- Department of Pharmacology, Faculty of Pharmacy, M S Ramaiah University of Applied Sciences, Bengaluru, Karnataka, India
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11
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Wu J, Tao W, Bu D, Zhao Y, Zhang T, Chong D, Xue B, Xing Z, Li C. Egr-1 transcriptionally activates protein phosphatase PTP1B to facilitate hyperinsulinemia-induced insulin resistance in the liver in type 2 diabetes. FEBS Lett 2019; 593:3054-3063. [PMID: 31309546 DOI: 10.1002/1873-3468.13537] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/26/2019] [Accepted: 07/04/2019] [Indexed: 01/14/2023]
Abstract
During the development of type 2 diabetes mellitus (T2DM), hyperinsulinemia is the earliest symptom. It is believed that long-term high insulin stimulation might facilitate insulin resistance in the liver, but the underlying mechanism remains unknown. Herein, we report that hyperinsulinemia could induce persistent early growth response gene-1 (Egr-1) activation in hepatocytes, which provides negative feedback inhibition of insulin sensitivity by inducing the expression of protein tyrosine phosphatase-1B (PTP1B). Deletion of Egr-1 in the liver remarkably decreases glucose production, thus improving systemic glucose tolerance and insulin sensitivity. Mechanistic analysis indicates that Egr-1 inhibits insulin receptor phosphorylation by directly activating PTP1B transcription in the liver. Our results reveal the molecular mechanism by which hyperinsulinemia accelerates insulin resistance in hepatocytes during the progression of T2DM.
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Affiliation(s)
- Jing Wu
- Medical School of Nanjing University, China.,Model Animal Research Center, Nanjing University, China
| | - Weiwei Tao
- Medical School of Nanjing University, China.,Model Animal Research Center, Nanjing University, China
| | - Dandan Bu
- Medical School of Nanjing University, China.,Model Animal Research Center, Nanjing University, China
| | - Yue Zhao
- Medical School of Nanjing University, China.,Model Animal Research Center, Nanjing University, China
| | - Tongyu Zhang
- Medical School of Nanjing University, China.,Model Animal Research Center, Nanjing University, China
| | - Danyang Chong
- Medical School of Nanjing University, China.,Model Animal Research Center, Nanjing University, China
| | - Bin Xue
- Core Laboratory, Sir Run Run Hospital, Nanjing Medical University, China
| | - Zheng Xing
- Medical School of Nanjing University, China.,Model Animal Research Center, Nanjing University, China
| | - Chaojun Li
- Medical School of Nanjing University, China.,Model Animal Research Center, Nanjing University, China
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12
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The Role of Protein Tyrosine Phosphatase (PTP)-1B in Cardiovascular Disease and Its Interplay with Insulin Resistance. Biomolecules 2019; 9:biom9070286. [PMID: 31319588 PMCID: PMC6680919 DOI: 10.3390/biom9070286] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 07/06/2019] [Accepted: 07/12/2019] [Indexed: 12/19/2022] Open
Abstract
Endothelial dysfunction is a key feature of cardiovascular disorders associated with obesity and diabetes. Several studies identified protein tyrosine phosphatase (PTP)-1B, a member of the PTP superfamily, as a major negative regulator for insulin receptor signaling and a novel molecular player in endothelial dysfunction and cardiovascular disease. Unlike other anti-diabetic approaches, genetic deletion or pharmacological inhibition of PTP1B was found to improve glucose homeostasis and insulin signaling without causing lipid buildup in the liver, which represents an advantage over existing therapies. Furthermore, PTP1B was reported to contribute to cardiovascular disturbances, at various molecular levels, which places this enzyme as a unique single therapeutic target for both diabetes and cardiovascular disorders. Synthesizing selective small molecule inhibitors for PTP1B is faced with multiple challenges linked to its similarity of sequence with other PTPs; however, overcoming these challenges would pave the way for novel approaches to treat diabetes and its concurrent cardiovascular complications. In this review article, we summarized the major roles of PTP1B in cardiovascular disease with special emphasis on endothelial dysfunction and its interplay with insulin resistance. Furthermore, we discussed some of the major challenges hindering the synthesis of selective inhibitors for PTP1B.
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13
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Liu P, Huang J, Zhong L. Role and mechanism of homocysteine in affecting hepatic protein-tyrosine phosphatase 1B. Biochim Biophys Acta Gen Subj 2019; 1863:941-949. [PMID: 30853337 DOI: 10.1016/j.bbagen.2019.03.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 02/27/2019] [Accepted: 03/01/2019] [Indexed: 12/13/2022]
Abstract
BACKGROUND Elevated homocysteine is epidemiologically related to insulin resistance. Protein-tyrosine phosphatase 1B (PTP1B) is a negative regulator of insulin signaling. However, the effect of homocysteine on PTP1B remains unclear. METHODS S-homocysteinylated PTP1B was identified by LC-ESI-MS/MS. The ability of thioredoxin system to recover active PTP1B from S-homocysteinylated PTP1B was confirmed by RNA interference. To address the mechanism for homocysteine to affect PTP1B activity, we performed 5-IAF insertion, activity assays, Western blotting, co-immunoprecipitation and glucose uptake experiments. RESULTS The thiol-containing form of homocysteine (HcySH) suppressed phosphorylation of insulin receptor-β subunit, but enhanced PTP1B activity. This phenomenon was partially related to the fact that HcySH promoted PTP1B expression. Although the disulfide-bonded form of homocysteine (HSSH) modified PTP1B to form an inactive S-homocysteinylated PTP1B, HcySH-induced increase in the activities of cellular thioredoxin and thioredoxin reductase, components of thioredoxin system, could recover active PTP1B from S-homocysteinylated PTP1B. Thioredoxin system transferred electrons from NADPH to S-homocysteinylated PTP1B, regenerating active PTP1B in vitro and in hepatocytes. The actions of HcySH were also related with decrease in hepatic glucose uptake. CONCLUSIONS The effect of HcySH/HSSH on PTP1B activity depends, at least partially, on the ratio of active PTP1B and S-homocysteinylated PTP1B. High HcySH-induced an increase in thioredoxin system activity is beneficial to de-S-homocysteinylation and is good for PTP1B activity. GENERAL SIGNIFICANCE Our data provide a novel insight into post-translational regulation of PTP1B, and expand the biological functions of thioredoxin system.
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Affiliation(s)
- Ping Liu
- Medical School, University of Chinese Academy of Sciences, the Campus of Yanqi, Huai Rou, 101407 Beijing, China
| | - Jin Huang
- Medical School, University of Chinese Academy of Sciences, the Campus of Yanqi, Huai Rou, 101407 Beijing, China
| | - Liangwei Zhong
- Medical School, University of Chinese Academy of Sciences, the Campus of Yanqi, Huai Rou, 101407 Beijing, China.
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14
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Computational study of new 1,2,3-triazole derivative of lithocholic acid: Structural aspects, non-linear optical properties and molecular docking studies as potential PTP 1B enzyme inhibitor. Comput Biol Chem 2019; 78:144-152. [DOI: 10.1016/j.compbiolchem.2018.11.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 10/09/2018] [Accepted: 11/18/2018] [Indexed: 01/14/2023]
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15
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Lu X, Wu L, Liu X, Wang S, Zhang C. BH3 mimetics derived from Bim-BH3 domain core region show PTP1B inhibitory activity. Bioorg Med Chem Lett 2018; 29:244-247. [PMID: 30501963 DOI: 10.1016/j.bmcl.2018.11.047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 11/20/2018] [Accepted: 11/22/2018] [Indexed: 01/04/2023]
Abstract
A series of our previously described BH3 peptide mimetics derived from Bim-BH3 domain core region were found to exhibit weak to potent PTP1B binding affinity and inhibitory activities via target-based drug screening. Among these compounds, a 12-aa Bim-BH3 core sequence peptide conjugated to palmitic acid (SM-6) displayed good PTP1B binding affinity (KD = 8.38 nmol/L), inhibitory activity (IC50 = 1.20 μmol/L) and selectivity against other PTPs (TCPTP, LAR, SHP-1 and SHP-2). Furthermore, SM-6 promoted HepG2 cell glucose uptake and inhibited the expression of PTP1B, indicating that SM-6 could improve the insulin resistance effect in the insulin-resistant HepG2 cell model. These results may indicate a new direction for the application of BH3 peptide mimetics and promising PTP1B peptide inhibitors could be designed and developed based on SM-6.
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Affiliation(s)
- Xiao Lu
- School of Medicine and Pharmacy, Key Laboratory of Marine Drugs, Ministry of Education, Ocean University of China, Qingdao 266003, China
| | - Lijuan Wu
- School of Medicine and Pharmacy, Key Laboratory of Marine Drugs, Ministry of Education, Ocean University of China, Qingdao 266003, China; Marine Biomedical Research Institute, Qingdao 266071, China
| | - Xiaochun Liu
- Marine Biomedical Research Institute, Qingdao 266071, China
| | - Shulin Wang
- School of Medicine and Pharmacy, Key Laboratory of Marine Drugs, Ministry of Education, Ocean University of China, Qingdao 266003, China; Marine Biomedical Research Institute, Qingdao 266071, China.
| | - Chuanliang Zhang
- School of Medicine and Pharmacy, Key Laboratory of Marine Drugs, Ministry of Education, Ocean University of China, Qingdao 266003, China; Marine Biomedical Research Institute, Qingdao 266071, China.
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16
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Toward the identification of a reliable 3D-QSAR model for the protein tyrosine phosphatase 1B inhibitors. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.01.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Kwon H, Jang D, Choi M, Lee J, Jeong K, Pak Y. Alternative translation initiation of Caveolin-2 desensitizes insulin signaling through dephosphorylation of insulin receptor by PTP1B and causes insulin resistance. Biochim Biophys Acta Mol Basis Dis 2018; 1864:2169-2182. [PMID: 29604334 DOI: 10.1016/j.bbadis.2018.03.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 03/08/2018] [Accepted: 03/26/2018] [Indexed: 12/30/2022]
Abstract
Insulin resistance, defined as attenuated sensitivity responding to insulin, impairs insulin action. Direct causes and molecular mechanisms of insulin resistance have thus far remained elusive. Here we show that alternative translation initiation (ATI) of Caveolin-2 (Cav-2) regulates insulin sensitivity. Cav-2β isoform yielded by ATI desensitizes insulin receptor (IR) via dephosphorylation by protein-tyrosine phosphatase 1B (PTP1B), and subsequent endocytosis and lysosomal degradation of IR, causing insulin resistance. Blockage of Cav-2 ATI protects against insulin resistance by preventing Cav-2β-PTP1B-directed IR desensitization, thereby normalizing insulin sensitivity and glucose uptake. Our findings show that Cav-2β is a negative regulator of IR signaling, and identify a mechanism causing insulin resistance through control of insulin sensitivity via Cav-2 ATI.
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Affiliation(s)
- Hayeong Kwon
- Division of Life Science, Graduate School of Applied Life Science (BK21 Plus Program), PMBBRC, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Donghwan Jang
- Division of Life Science, Graduate School of Applied Life Science (BK21 Plus Program), PMBBRC, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Moonjeong Choi
- Division of Life Science, Graduate School of Applied Life Science (BK21 Plus Program), PMBBRC, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Jaewoong Lee
- Division of Life Science, Graduate School of Applied Life Science (BK21 Plus Program), PMBBRC, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Kyuho Jeong
- Division of Life Science, Graduate School of Applied Life Science (BK21 Plus Program), PMBBRC, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Yunbae Pak
- Division of Life Science, Graduate School of Applied Life Science (BK21 Plus Program), PMBBRC, Gyeongsang National University, Jinju 52828, Republic of Korea.
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18
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Asymmetric dimethylarginine (ADMA) is identified as a potential biomarker of insulin resistance in skeletal muscle. Sci Rep 2018; 8:2133. [PMID: 29391561 PMCID: PMC5794993 DOI: 10.1038/s41598-018-20549-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 11/16/2017] [Indexed: 12/19/2022] Open
Abstract
To unravel metabolic determinats of insulin resistance, we performed a targeted metabolomics analysis in Korean Children-Adolescent Cohort Study (KoCAS, n = 430). Sixty-seven metabolites were associated with insulin resistance in adolescents and the association also found in an adult population (KoGES, n = 2,485). Functional interactions of metabolites with gene/proteins using biological pathway with insulin resistance were not identified biological significance and regulatory effects of asymmetric dimethylarginine (ADMA). However, ADMA showed a higher association with adolescent obesity (P < 0.001) and adult diabetes (P = 0.007) and decreased after obesity intervention program. Functional studies in cellular and mouse models demonstrated that an accumulation of ADMA is associated with the regulation of obesity-induced insulin resistance in skeletal muscle. ADMA treatment inhibited dimethylarginine-dimethylaminohydrolase (DDAH) activity and mRNA expression in insulin resistance muscle cell. Moreover, the treatment led to decrease of phosphorylation of insulin receptor (IR), AKT, and GLUT4 but increase of protein-tyrosine phosphatase 1B (PTP1B). Accordingly, increased ADMA significantly inhibited glucose uptake in myotube cell. We suggest that accumulation of ADMA is associated with modulation of insulin signaling and insulin resistance. ADMA might expand the possibilities of new therapeutic target for functional and clinical implications in the control of energy and metabolic homeostasis in humans.
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19
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Aberdein N, Dambrino RJ, do Carmo JM, Wang Z, Mitchell LE, Drummond HA, Hall JE. Role of PTP1B in POMC neurons during chronic high-fat diet: sex differences in regulation of liver lipids and glucose tolerance. Am J Physiol Regul Integr Comp Physiol 2017; 314:R478-R488. [PMID: 29351427 DOI: 10.1152/ajpregu.00287.2017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Protein tyrosine phosphatase 1B (PTP1B) is a negative regulator of leptin receptor signaling and may contribute to leptin resistance in diet-induced obesity. Although PTP1B inhibition has been suggested as a potential weight loss therapy, the role of specific neuronal PTP1B signaling in cardiovascular and metabolic regulation and the importance of sex differences in this regulation are still unclear. In this study, we investigated the impact of proopiomelanocortin (POMC) neuronal PTP1B deficiency in cardiometabolic regulation in male and female mice fed a high-fat diet (HFD). When compared with control mice (PTP1B flox/flox), male and female mice deficient in POMC neuronal PTP1B (PTP1B flox/flox/POMC-Cre) had attenuated body weight gain (males: -18%; females: -16%) and fat mass (males: -33%; female: -29%) in response to HFD. Glucose tolerance was improved by 40%, and liver lipid accumulation was reduced by 40% in PTP1B/POMC-Cre males but not in females. When compared with control mice, deficiency of POMC neuronal PTP1B did not alter mean arterial pressure (MAP) in male or female mice (males: 112 ± 1 vs. 112 ± 1 mmHg in controls; females: 106 ± 3 vs. 109 ± 3 mmHg in controls). Deficiency of POMC neuronal PTP1B also did not alter MAP response to acute stress in males or females compared with control mice (males: Δ32 ± 0 vs. Δ29 ± 4 mmHg; females: Δ22 ± 2 vs. Δ27 ± 4 mmHg). These data demonstrate that POMC-specific PTP1B deficiency improved glucose tolerance and attenuated diet-induced fatty liver only in male mice and attenuated weight gain in males and females but did not enhance the MAP and HR responses to a HFD or to acute stress.
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Affiliation(s)
- Nicola Aberdein
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center , Jackson, Mississippi.,Biomedical Research Center, Department of Health and Wellbeing, Sheffield Hallam University , Sheffield , United Kingdom
| | - Robert J Dambrino
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center , Jackson, Mississippi
| | - Jussara M do Carmo
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center , Jackson, Mississippi
| | - Zhen Wang
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center , Jackson, Mississippi
| | - Laura E Mitchell
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center , Jackson, Mississippi
| | - Heather A Drummond
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center , Jackson, Mississippi
| | - John E Hall
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center , Jackson, Mississippi
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20
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Sorokoumov VN, Shpakov AO. Protein phosphotyrosine phosphatase 1B: Structure, function, role in the development of metabolic disorders and their correction by the enzyme inhibitors. J EVOL BIOCHEM PHYS+ 2017. [DOI: 10.1134/s0022093017040020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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Choy MS, Li Y, Machado LESF, Kunze MBA, Connors CR, Wei X, Lindorff-Larsen K, Page R, Peti W. Conformational Rigidity and Protein Dynamics at Distinct Timescales Regulate PTP1B Activity and Allostery. Mol Cell 2017; 65:644-658.e5. [PMID: 28212750 DOI: 10.1016/j.molcel.2017.01.014] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 12/07/2016] [Accepted: 01/09/2017] [Indexed: 12/31/2022]
Abstract
Protein function originates from a cooperation of structural rigidity, dynamics at different timescales, and allostery. However, how these three pillars of protein function are integrated is still only poorly understood. Here we show how these pillars are connected in Protein Tyrosine Phosphatase 1B (PTP1B), a drug target for diabetes and cancer that catalyzes the dephosphorylation of numerous substrates in essential signaling pathways. By combining new experimental and computational data on WT-PTP1B and ≥10 PTP1B variants in multiple states, we discovered a fundamental and evolutionarily conserved CH/π switch that is critical for positioning the catalytically important WPD loop. Furthermore, our data show that PTP1B uses conformational and dynamic allostery to regulate its activity. This shows that both conformational rigidity and dynamics are essential for controlling protein activity. This connection between rigidity and dynamics at different timescales is likely a hallmark of all enzyme function.
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Affiliation(s)
- Meng S Choy
- Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, RI 02912, USA
| | - Yang Li
- Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, RI 02912, USA
| | - Luciana E S F Machado
- Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, RI 02912, USA
| | - Micha B A Kunze
- Department of Biology, University of Copenhagen, 2200 Copenhagen, Denmark, Brown University, Providence, RI 02912, USA
| | - Christopher R Connors
- Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, RI 02912, USA
| | - Xingyu Wei
- Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, RI 02912, USA
| | - Kresten Lindorff-Larsen
- Department of Biology, University of Copenhagen, 2200 Copenhagen, Denmark, Brown University, Providence, RI 02912, USA
| | - Rebecca Page
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912, USA
| | - Wolfgang Peti
- Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, RI 02912, USA; Department of Chemistry, Brown University, Providence, RI 02912, USA.
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22
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Huang Q, Han L, Liu Y, Wang C, Duan D, Lu N, Wang K, Zhang L, Gu K, Duan S, Mai Y. Elevation of PTPN1 promoter methylation is a significant risk factor of type 2 diabetes in the Chinese population. Exp Ther Med 2017; 14:2976-2982. [PMID: 29042909 PMCID: PMC5639402 DOI: 10.3892/etm.2017.4924] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 03/06/2017] [Indexed: 12/15/2022] Open
Abstract
The present study aimed to investigate the contribution of DNA methylation of the protein tyrosine phosphatase, non-receptor type 1 (PTPN1) gene to the susceptibility to type 2 diabetes (T2D). Peripheral blood mononuclear cells (PBMCs) were collected from 97 patients with T2D and 97 age- and gender-matched controls. DNA methylation of the PTPN1 gene promoter was evaluated by bisulfite pyrosequencing. Independent sample t-tests were used to compare the differences in the PTPN1 promoter and other phenotypes between the patients with T2D and the controls. The results indicated a significant correlation between PTPN1 promoter methylation and the risk of T2D. Additionally, a breakdown analysis by gender revealed that PTPN1 methylation was associated with an increased risk of T2D in females. Furthermore, low-density lipoprotein (r=−0.183, P=0.046) and total cholesterol (r=−0.310, P=0.001) were inversely associated with PTPN1 methylation in females. In conclusion, the results indicate that elevated PTPN1 promoter methylation is a risk factor for T2D in the female Chinese population.
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Affiliation(s)
- Qing Huang
- The Affiliated Hospital of Ningbo University School of Medicine, Ningbo, Zhejiang 315020, P.R. China
| | - Liyuan Han
- Genetics Center, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Yanfen Liu
- Genetics Center, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Changyi Wang
- Department of Chronic Disease Prevention and Control, Shenzhen Nanshan Center for Chronic Disease Control, Shenzhen, Guangdong 518000, P.R. China
| | - Donghui Duan
- Genetics Center, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Nanjia Lu
- Genetics Center, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Kaiyue Wang
- Genetics Center, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Lu Zhang
- Genetics Center, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Kaibo Gu
- Genetics Center, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Shiwei Duan
- Genetics Center, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Yifeng Mai
- The Affiliated Hospital of Ningbo University School of Medicine, Ningbo, Zhejiang 315020, P.R. China
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23
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Cellular Dynamics Controlled by Phosphatases. J Indian Inst Sci 2017. [DOI: 10.1007/s41745-016-0016-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Lipchock JM, Hendrickson HP, Douglas BB, Bird KE, Ginther PS, Rivalta I, Ten NS, Batista VS, Loria JP. Characterization of Protein Tyrosine Phosphatase 1B Inhibition by Chlorogenic Acid and Cichoric Acid. Biochemistry 2017; 56:96-106. [PMID: 27959494 PMCID: PMC5292209 DOI: 10.1021/acs.biochem.6b01025] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Protein tyrosine phosphatase 1B (PTP1B) is a known regulator of the insulin and leptin signaling pathways and is an active target for the design of inhibitors for the treatment of type II diabetes and obesity. Recently, cichoric acid (CHA) and chlorogenic acid (CGA) were predicted by docking methods to be allosteric inhibitors that bind distal to the active site. However, using a combination of steady-state inhibition kinetics, solution nuclear magnetic resonance experiments, and molecular dynamics simulations, we show that CHA is a competitive inhibitor that binds in the active site of PTP1B. CGA, while a noncompetitive inhibitor, binds in the second aryl phosphate binding site, rather than the predicted benzfuran binding pocket. The molecular dynamics simulations of the apo enzyme and cysteine-phosphoryl intermediate states with and without bound CGA suggest CGA binding inhibits PTP1B by altering hydrogen bonding patterns at the active site. This study provides a mechanistic understanding of the allosteric inhibition of PTP1B.
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Affiliation(s)
- James M. Lipchock
- Department of Chemistry, Washington College, Chestertown, Maryland 21620, United States
| | - Heidi P. Hendrickson
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
| | - Bonnie B. Douglas
- Department of Chemistry, Washington College, Chestertown, Maryland 21620, United States
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
| | - Kelly E. Bird
- Department of Chemistry, Washington College, Chestertown, Maryland 21620, United States
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
| | - Patrick S. Ginther
- Department of Chemistry, Washington College, Chestertown, Maryland 21620, United States
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
| | - Ivan Rivalta
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
- Univ Lyon, Ens de Lyon, CNRS, Université Lyon 1, Laboratoire de Chimie UMR 5182, F-69342, Lyon, France
| | - Nicholas S. Ten
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
| | - Victor S. Batista
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
| | - J. Patrick Loria
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06511, United States
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Lv J, Chen T, Yue X, Zhou J, Gong X, Zhang J. A colorimetric biosensor based on guanidinium recognition for the assay of protein tyrosine phosphatase 1B and its inhibitors. NEW J CHEM 2017. [DOI: 10.1039/c7nj02918g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A new colorimetric biosensor for the assay of PTP1B and its inhibitors based on coordination between RGC/AuNPs and MNPs/APP.
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Affiliation(s)
- Jun Lv
- Center for Molecular Recognition and Biosensing
- School of Life Sciences
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Tingjun Chen
- Center for Molecular Recognition and Biosensing
- School of Life Sciences
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Xiquan Yue
- Center for Molecular Recognition and Biosensing
- School of Life Sciences
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Jianqiong Zhou
- Center for Molecular Recognition and Biosensing
- School of Life Sciences
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Xiuqing Gong
- Materials Genome Institute
- Shanghai University
- Shanghai 200444
- China
| | - Juan Zhang
- Center for Molecular Recognition and Biosensing
- School of Life Sciences
- Shanghai University
- Shanghai 200444
- P. R. China
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Recent advances in the development of protein tyrosine phosphatase 1B inhibitors for Type 2 diabetes. Future Med Chem 2016; 8:1239-58. [PMID: 27357615 DOI: 10.4155/fmc-2016-0064] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Diabetes mellitus is the most serious and prevalent metabolic disorders worldwide, complications of which can decrease significantly the quality of life and contribute to premature death. Resistance to insulin is a predominant pathophysiological factor of Type 2 diabetes (T2D). Protein tyrosine phosphatase 1B (PTP1B) is an important negative factor of insulin signal and a potent therapeutic target in T2D patients. This review highlights recent advances (2012-2015) in research related to the role of PTP1B in signal transduction processes implicated in pathophysiology of T2D, and novel PTP1B inhibitors with an emphasis on their chemical structures and modes of action.
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Chadha N, Bahia MS, Kaur M, Silakari O. Thiazolidine-2,4-dione derivatives: Programmed chemical weapons for key protein targets of various pathological conditions. Bioorg Med Chem 2015; 23:2953-74. [DOI: 10.1016/j.bmc.2015.03.071] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 03/26/2015] [Accepted: 03/28/2015] [Indexed: 10/23/2022]
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Zhang J, Li L, Li J, Liu Y, Zhang CY, Zhang Y, Zen K. Protein tyrosine phosphatase 1B impairs diabetic wound healing through vascular endothelial growth factor receptor 2 dephosphorylation. Arterioscler Thromb Vasc Biol 2014; 35:163-74. [PMID: 25395617 DOI: 10.1161/atvbaha.114.304705] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Impaired wound healing is a major complication of diabetes mellitus. The mechanisms that govern wound healing, however, are complex and incompletely understood. In the present study, we determined the inhibitory role of protein tyrosine phosphatase 1B (PTP1B) in the process of diabetic wound healing. APPROACH AND RESULTS First, by comparing the wound healing process in PTP1B knockout (PTP1B(-/-)) mice, ob/ob mice and their wild-type littermates in the presence or absence of streptozotocin treatment, we showed that the inhibition of mouse wound healing in streptozotocin-induced diabetic conditions is because of the upregulation and activation of PTP1B. Second, the impaired wound healing in ob/ob mice and streptozotocin-treated wild-type mice was rescued by a PTP1B inhibitor. Third, PTP1B, which is upregulated under hyperglycemic condition, inhibited the tube formation, proliferation, and migration of human microvascular endothelial cells induced by vascular endothelial growth factor, whereas this inhibition was largely abolished by the PTP1B inhibitor. Finally, mechanism study further indicated that PTP1B likely suppressed the proliferation, migration, and tube formation of vascular endothelial cells through dephosphorylation of vascular endothelial growth factor receptor 2. CONCLUSIONS Our study demonstrated that PTP1B negatively modulated the diabetic wound healing process by dephosphorylating the endothelial cell vascular endothelial growth factor receptor 2 and that the specific inhibitor of PTP1B might serve as a potential novel therapeutic tool for diabetic wound healing.
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Affiliation(s)
- Jing Zhang
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.)
| | - Limin Li
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.)
| | - Jing Li
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.)
| | - Yuan Liu
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.)
| | - Chen-Yu Zhang
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.).
| | - Yujing Zhang
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.).
| | - Ke Zen
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.).
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Identification of novel PTP1B inhibitors by pharmacophore based virtual screening, scaffold hopping and docking. Eur J Med Chem 2014; 87:578-94. [DOI: 10.1016/j.ejmech.2014.09.097] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 09/03/2014] [Accepted: 09/30/2014] [Indexed: 11/23/2022]
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Bakke J, Haj FG. Protein-tyrosine phosphatase 1B substrates and metabolic regulation. Semin Cell Dev Biol 2014; 37:58-65. [PMID: 25263014 DOI: 10.1016/j.semcdb.2014.09.020] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 09/15/2014] [Accepted: 09/21/2014] [Indexed: 01/19/2023]
Abstract
Metabolic homeostasis requires integration of complex signaling networks which, when deregulated, contribute to metabolic syndrome and related disorders. Protein-tyrosine phosphatase 1B (PTP1B) has emerged as a key regulator of signaling networks that are implicated in metabolic diseases such as obesity and type 2 diabetes. In this review, we examine mechanisms that regulate PTP1B-substrate interaction, enzymatic activity and experimental approaches to identify PTP1B substrates. We then highlight findings that implicate PTP1B in metabolic regulation. In particular, insulin and leptin signaling are discussed as well as recently identified PTP1B substrates that are involved in endoplasmic reticulum stress response, cell-cell communication, energy balance and vesicle trafficking. In summary, PTP1B exhibits exquisite substrate specificity and is an outstanding pharmaceutical target for obesity and type 2 diabetes.
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Affiliation(s)
- Jesse Bakke
- Department of Nutrition, University of California Davis, One Shields Ave, Davis, CA 95616, United States
| | - Fawaz G Haj
- Department of Nutrition, University of California Davis, One Shields Ave, Davis, CA 95616, United States; Division of Endocrinology, Diabetes and Metabolism, Department of Internal Medicine, University of California Davis, Sacramento, CA 95817, United States; Comprehensive Cancer Center, University of California Davis, Sacramento, CA 95817, United States.
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Panzhinskiy E, Hua Y, Culver B, Ren J, Nair S. Endoplasmic reticulum stress upregulates protein tyrosine phosphatase 1B and impairs glucose uptake in cultured myotubes. Diabetologia 2013; 56. [PMID: 23178931 PMCID: PMC3568946 DOI: 10.1007/s00125-012-2782-z] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
AIMS/HYPOTHESIS Endoplasmic reticulum (ER) stress has been recognised as a common pathway in the development of obesity-associated insulin resistance. Protein tyrosine phosphatase 1B (PTP1B) is a negative regulator of insulin signalling and is localised on the ER membrane. The aim of the study was to investigate the cross-talk between ER stress and PTP1B. METHODS Leptin-deficient obese (ob/ob), Ptp1b (also known as Ptpn1) knockout and C57BL/6J mice were subjected to a high-fat or normal-chow diet for 20 weeks. ER stress was induced in cultured myotubes by treatment with tunicamycin. Immunohistochemistry and western blotting were used to assess proteins involved in the ER stress response. Myotube glucose uptake was determined by measuring 2-deoxy[(3)H]glucose incorporation. RESULTS A high-fat diet induced ER stress and PTP1B expression in the muscle tissue of mice and these responses were attenuated by treatment with the ER chaperone tauroursodeoxycholic acid (TUDCA). Cultured myotubes exhibited increased levels of PTP1B in response to tunicamycin treatment. Silencing of Ptp1b with small interfering RNA (siRNA) or overexpression of Ptp1b with adenovirus construct failed to alter the levels of ER stress. Ptp1b knockout mice did not differ from the wild-type mice in the extent of tunicamycin-induced upregulation of glucose-regulated protein-78. However, tunicamycin-induced phosphorylation of eukaryotic initiation factor 2α and c-Jun NH(2)-terminal kinase-2 were significantly attenuated in the Ptp1b knockout mice. Treatment with TUDCA or silencing of PTP1B reversed tunicamycin-induced blunted myotube glucose uptake. CONCLUSIONS/INTERPRETATION Our data suggest that PTP1B is activated by ER stress and is required for full-range activation of ER stress pathways in mediating insulin resistance in the skeletal muscle.
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Affiliation(s)
- E. Panzhinskiy
- School of Pharmacy, University of Wyoming, College of Health Sciences, Laramie, WY 82071, USA. Center for Cardiovascular Research and Alternative Medicine, University of Wyoming, Laramie, WY, USA
| | - Y. Hua
- School of Pharmacy, University of Wyoming, College of Health Sciences, Laramie, WY 82071, USA. Center for Cardiovascular Research and Alternative Medicine, University of Wyoming, Laramie, WY, USA
| | - B. Culver
- School of Pharmacy, University of Wyoming, College of Health Sciences, Laramie, WY 82071, USA. Center for Cardiovascular Research and Alternative Medicine, University of Wyoming, Laramie, WY, USA
| | - J. Ren
- School of Pharmacy, University of Wyoming, College of Health Sciences, Laramie, WY 82071, USA. Center for Cardiovascular Research and Alternative Medicine, University of Wyoming, Laramie, WY, USA
| | - S. Nair
- School of Pharmacy, University of Wyoming, College of Health Sciences, Laramie, WY 82071, USA. Center for Cardiovascular Research and Alternative Medicine, University of Wyoming, Laramie, WY, USA
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Hubbard SR. The insulin receptor: both a prototypical and atypical receptor tyrosine kinase. Cold Spring Harb Perspect Biol 2013; 5:a008946. [PMID: 23457259 DOI: 10.1101/cshperspect.a008946] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Unlike prototypical receptor tyrosine kinases (RTKs), which are single-chain polypeptides, the insulin receptor (InsR) is a preformed, covalently linked tetramer with two extracellular α subunits and two membrane-spanning, tyrosine kinase-containing β subunits. A single molecule of insulin binds asymmetrically to the ectodomain, triggering a conformational change that is transmitted to the cytoplasmic kinase domains, which facilitates their trans-phosphorylation. As in prototypical RTKs, tyrosine phosphorylation in the juxtamembrane region of InsR creates recruitment sites for downstream signaling proteins (IRS [InsR substrate] proteins, Shc) containing a phosphotyrosine-binding (PTB) domain, and tyrosine phosphorylation in the kinase activation loop stimulates InsR's catalytic activity. For InsR, phosphorylation of the activation loop, which contains three tyrosine residues, also creates docking sites for adaptor proteins (Grb10/14, SH2B2) that possess specialized Src homology-2 (SH2) domains, which are dimeric and engage two phosphotyrosines in the activation loop.
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Affiliation(s)
- Stevan R Hubbard
- Kimmel Center for Biology and Medicine of the Skirball Institute and Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York 10016, USA.
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Gryboś R, Paciorek P, Szklarzewicz JT, Matoga D, Zabierowski P, Kazek G. Novel vanadyl complexes of acetoacetanilide: Synthesis, characterization and inhibition of proteintyrosine phosphatase. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.09.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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He HB, Gao LX, Deng QF, Ma WP, Tang CL, Qiu WW, Tang J, Li JY, Li J, Yang F. Synthesis and biological evaluation of 4,4-dimethyl lithocholic acid derivatives as novel inhibitors of protein tyrosine phosphatase 1B. Bioorg Med Chem Lett 2012; 22:7237-42. [DOI: 10.1016/j.bmcl.2012.09.040] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 09/01/2012] [Accepted: 09/12/2012] [Indexed: 12/18/2022]
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Ong JX, Yap CW, Ang WH. Rational Design of Selective Organoruthenium Inhibitors of Protein Tyrosine Phosphatase 1B. Inorg Chem 2012; 51:12483-92. [DOI: 10.1021/ic301884j] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Jun Xiang Ong
- Department of Chemistry, National University of Singapore, 3 Science Drive 3,
Singapore 117543
| | - Chun Wei Yap
- Department
of Pharmacy, National University of Singapore, 18 Science Drive
4, Singapore 117543
| | - Wee Han Ang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3,
Singapore 117543
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Haj FG, Sabet O, Kinkhabwala A, Wimmer-Kleikamp S, Roukos V, Han HM, Grabenbauer M, Bierbaum M, Antony C, Neel BG, Bastiaens PI. Regulation of signaling at regions of cell-cell contact by endoplasmic reticulum-bound protein-tyrosine phosphatase 1B. PLoS One 2012; 7:e36633. [PMID: 22655028 PMCID: PMC3360045 DOI: 10.1371/journal.pone.0036633] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Accepted: 04/04/2012] [Indexed: 12/17/2022] Open
Abstract
Protein-tyrosine phosphatase 1B (PTP1B) is a ubiquitously expressed PTP that is anchored to the endoplasmic reticulum (ER). PTP1B dephosphorylates activated receptor tyrosine kinases after endocytosis, as they transit past the ER. However, PTP1B also can access some plasma membrane (PM)-bound substrates at points of cell-cell contact. To explore how PTP1B interacts with such substrates, we utilized quantitative cellular imaging approaches and mathematical modeling of protein mobility. We find that the ER network comes in close proximity to the PM at apparently specialized regions of cell-cell contact, enabling PTP1B to engage substrate(s) at these sites. Studies using PTP1B mutants show that the ER anchor plays an important role in restricting its interactions with PM substrates mainly to regions of cell-cell contact. In addition, treatment with PTP1B inhibitor leads to increased tyrosine phosphorylation of EphA2, a PTP1B substrate, specifically at regions of cell-cell contact. Collectively, our results identify PM-proximal sub-regions of the ER as important sites of cellular signaling regulation by PTP1B.
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Affiliation(s)
- Fawaz G. Haj
- Beth Israel Deaconess Medical Center, Harvard University, Boston, Massachusetts, United States of America
- Nutrition Department, University of California Davis, Davis, California, United States of America
- * E-mail: (FGH) (FH); (BGN) (BN); (PIB) (PB)
| | - Ola Sabet
- Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Ali Kinkhabwala
- Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Sabine Wimmer-Kleikamp
- Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Vassilis Roukos
- Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Hong-Mei Han
- Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Markus Grabenbauer
- Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Martin Bierbaum
- Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Claude Antony
- European Molecular Biology Laboratories, Heidelberg, Germany
| | - Benjamin G. Neel
- Beth Israel Deaconess Medical Center, Harvard University, Boston, Massachusetts, United States of America
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network, and Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
- * E-mail: (FGH) (FH); (BGN) (BN); (PIB) (PB)
| | - Philippe I. Bastiaens
- Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, Dortmund, Germany
- * E-mail: (FGH) (FH); (BGN) (BN); (PIB) (PB)
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Abstract
Insulin resistance is a key pathological feature of type 2 diabetes and is characterized by defects in signaling by the insulin receptor (IR) protein tyrosine kinase. The inhibition of protein tyrosine phosphatases (PTPs) that antagonize IR signaling may provide a means for enhancing the insulin response and alleviating insulin resistance. The prototypic phosphotyrosine-specific phosphatase PTP1B dephosphorylates the IR and attenuates insulin signaling in muscle and liver. Mice that are deficient for PTP1B exhibit improved glucose homeostasis in diet and genetic models of insulin resistance and type 2 diabetes. The phosphatase TCPTP shares 72% catalytic domain sequence identity with PTP1B and has also been implicated in IR regulation. Despite their high degree of similarity, PTP1B and TCPTP act together in vitro and in vivo to regulate insulin signaling and glucose homeostasis. This review highlights their capacity to act specifically and nonredundantly in cellular signaling, describes their roles in IR regulation and glucose homeostasis, and discusses their potential as drug targets for the enhancement of IR phosphorylation and insulin sensitivity in type 2 diabetes.
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Affiliation(s)
- Tony Tiganis
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Australia.
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Basavarajappa DK, Gupta VK, Rajala RVS. Protein tyrosine phosphatase 1B: a novel molecular target for retinal degenerative diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 723:829-34. [PMID: 22183413 DOI: 10.1007/978-1-4614-0631-0_106] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Protein tyrosine phosphatase 1B (PTP1B) is considered as a major negative regulator of insulin receptor (IR) signaling. IR signaling in retina has been demonstrated to be neuroprotective. Photoreceptor specific deletion of PTP1B results in enhanced retinal IR-mediated neuroprotection indicating the importance of PTP1B as a negative regulator in the retina. Elevated levels of retinal PTP1B activity has been observed in mice lacking retinal pigment epithelium (Rpe65-/-), a mouse model of leber congenital amaurosis (LCA-type 2), retinitis pigmentosa and diabetic retinopathy animal models. This enhanced PTP1B activity could down regulate the IR signaling which may contribute to the death of photoreceptor neurons and ultimately lead to retinal degenerations. The potential therapeutic agents that specifically reduce or inhibit the PTP1B activity could be beneficial in protecting or delaying the photoreceptor cell death in the retinal degenerative diseases.
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Affiliation(s)
- Devaraj K Basavarajappa
- Department of Ophthalmology, Dean A. McGee Eye Institute, University of Oklahoma Health Sciences Center, 608 Stanton L. Young Boulevard, Oklahoma City, OK 73104, USA
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Duodenal-jejunal bypass surgery does not increase skeletal muscle insulin signal transduction or glucose disposal in Goto-Kakizaki type 2 diabetic rats. Obes Surg 2011; 21:231-7. [PMID: 21086062 DOI: 10.1007/s11695-010-0304-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND Duodenal-jejunal bypass (DJB) has been shown to reverse type 2 diabetes (T2DM) in Goto-Kakizaki (GK) rats, a rodent model of non-obese T2DM. Skeletal muscle insulin resistance is a hallmark decrement in T2DM. The aim of the current work was to investigate the effects of DJB on skeletal muscle insulin signal transduction and glucose disposal. It was hypothesized that DJB would increase skeletal muscle insulin signal transduction and glucose disposal in GK rats. METHODS DJB was performed in GK rats. Sham operations were performed in GK and nondiabetic Wistar-Kyoto (WKY) rats. At 2 weeks post-DJB, oral glucose tolerance (OGTT) was measured. At 3 weeks post-DJB, insulin-induced signal transduction and glucose disposal were measured in skeletal muscle. RESULTS In GK rats and compared to sham operation, DJB did not (1) improve fasting glucose or insulin, (2) improve OGTT, or (3) increase skeletal muscle insulin signal transduction or glucose disposal. Interestingly, skeletal muscle glucose disposal was similar between WKY-Sham, GK-Sham, and GK-DJB. CONCLUSIONS Bypassing of the proximal small intestine does not increase skeletal muscle glucose disposal. The lack of skeletal muscle insulin resistance in GK rats questions whether this animal model is adequate to investigate the etiology and treatments for T2DM. Additionally, bypassing of the foregut may lead to different findings in other animal models of T2DM as well as in T2DM patients.
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Kang SW, Kim JL, Kwon GT, Lee YJ, Park JHY, Lim SS, Kang YH. Sensitive Fern (Onoclea sensibilis) Extract Suppresses Proliferation and Migration of Vascular Smooth Muscle Cells Inflamed by Neighboring Macrophages. Biol Pharm Bull 2011; 34:1717-23. [DOI: 10.1248/bpb.34.1717] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | - Jung-Lye Kim
- Department of Food and Nutrition, Hallym University
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Yip SC, Saha S, Chernoff J. PTP1B: a double agent in metabolism and oncogenesis. Trends Biochem Sci 2010; 35:442-9. [PMID: 20381358 PMCID: PMC2917533 DOI: 10.1016/j.tibs.2010.03.004] [Citation(s) in RCA: 208] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Revised: 03/02/2010] [Accepted: 03/05/2010] [Indexed: 01/17/2023]
Abstract
PTP1B, a non-transmembrane protein tyrosine phosphatase that has long been studied as a negative regulator of insulin and leptin signaling, has received renewed attention as an unexpected positive factor in tumorigenesis. Here, we highlight how views of this enzyme have evolved from regarding it as a simple metabolic off-switch to a more complex view of PTP1B as an enzyme that can play both negative and positive roles in diverse signaling pathways. These dual characteristics make PTP1B a particularly attractive therapeutic target for diabetes, obesity, and perhaps breast cancer.
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Affiliation(s)
- Shu-Chin Yip
- Fox Chase Cancer Center, 333 Cottman Avenue, Philadelphia, PA 19111, USA
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Sundaram S, Tiwari P, Saini S, Kant R, Alex Davis J, Sahdev S, Singh Saini K. Baculovirus expression system: An alternative for producing catalytically active human PTP-1B. Mol Biol 2010. [DOI: 10.1134/s0026893310030179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ali MI, Ketsawatsomkron P, Belin de Chantemele EJ, Mintz JD, Muta K, Salet C, Black SM, Tremblay ML, Fulton DJ, Marrero MB, Stepp DW. Deletion of protein tyrosine phosphatase 1b improves peripheral insulin resistance and vascular function in obese, leptin-resistant mice via reduced oxidant tone. Circ Res 2009; 105:1013-22. [PMID: 19797171 DOI: 10.1161/circresaha.109.206318] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
RATIONALE Obesity is a risk factor for cardiovascular dysfunction, yet the underlying factors driving this impaired function remain poorly understood. Insulin resistance is a common pathology in obese patients and has been shown to impair vascular function. Whether insulin resistance or obesity, itself, is causal remains unclear. OBJECTIVE The present study tested the hypothesis that insulin resistance is the underlying mediator for impaired NO-mediated dilation in obesity by genetic deletion of the insulin-desensitizing enzyme protein tyrosine phosphatase (PTP)1B in db/db mice. METHODS AND RESULTS The db/db mouse is morbidly obese, insulin-resistant, and has tissue-specific elevation in PTP1B expression compared to lean controls. In db/db mice, PTP1B deletion improved glucose clearance, dyslipidemia, and insulin receptor signaling in muscle and fat. Hepatic insulin signaling in db/db mice was not improved by deletion of PTP1B, indicating specific amelioration of peripheral insulin resistance. Additionally, obese mice demonstrate an impaired endothelium dependent and independent vasodilation to acetylcholine and sodium nitroprusside, respectively. This impairment, which correlated with increased superoxide in the db/db mice, was corrected by superoxide scavenging. Increased superoxide production was associated with increased expression of NAD(P)H oxidase 1 and its molecular regulators, Noxo1 and Noxa1. CONCLUSIONS Deletion of PTP1B improved both endothelium dependent and independent NO-mediated dilation and reduced superoxide generation in db/db mice. PTP1B deletion did not affect any vascular function in lean mice. Taken together, these data reveal a role for peripheral insulin resistance as the mediator of vascular dysfunction in obesity.
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Affiliation(s)
- M Irfan Ali
- Vascular Biology Center, Medical College of Georgia, 1459 Laney Walker Blvd, Augusta, GA 30912, USA
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Inhibition of bromophenols against PTP1B and anti-hyperglycemic effect of Rhodomela confervoides extract in diabetic rats. Sci Bull (Beijing) 2008. [DOI: 10.1007/s11434-008-0353-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Li S, Depetris RS, Barford D, Chernoff J, Hubbard SR. Crystal structure of a complex between protein tyrosine phosphatase 1B and the insulin receptor tyrosine kinase. Structure 2008; 13:1643-51. [PMID: 16271887 DOI: 10.1016/j.str.2005.07.019] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2005] [Revised: 07/28/2005] [Accepted: 07/28/2005] [Indexed: 02/03/2023]
Abstract
Protein tyrosine phosphatase 1B (PTP1B) is a highly specific negative regulator of insulin receptor signaling in vivo. The determinants of PTP1B specificity for the insulin receptor versus other receptor tyrosine kinases are largely unknown. Here, we report a crystal structure at 2.3 A resolution of the catalytic domain of PTP1B (trapping mutant) in complex with the phosphorylated tyrosine kinase domain of the insulin receptor (IRK). The crystallographic asymmetric unit contains two PTP1B-IRK complexes that interact through an IRK dimer interface. Rather than binding to a phosphotyrosine in the IRK activation loop, PTP1B binds instead to the opposite side of the kinase domain, with the phosphorylated activation loops sequestered within the IRK dimer. The crystal structure provides evidence for a noncatalytic mode of interaction between PTP1B and IRK, which could be important for the selective recruitment of PTP1B to the insulin receptor.
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Affiliation(s)
- Shiqing Li
- Structural Biology Program, Skirball Institute of Biomolecular Medicine and Department of Pharmacology, New York University School of Medicine, New York, New York 10016, USA
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Aga-Mizrachi S, Brutman-Barazani T, Jacob AI, Bak A, Elson A, Sampson SR. Cytosolic protein tyrosine phosphatase-epsilon is a negative regulator of insulin signaling in skeletal muscle. Endocrinology 2008; 149:605-14. [PMID: 18006633 DOI: 10.1210/en.2007-0908] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Whereas positive regulatory events triggered by insulin binding to insulin receptor (IR) have been well documented, the mechanism by which the activated IR is returned to the basal status is not completely understood. Recently studies focused on the involvement of protein tyrosine phosphatases (PTPs) and how they might influence IR signaling. In this study, we examined the possibility that cytosolic PTPepsilon (cytPTPepsilon) is involved in IR signaling. Studies were performed on L6 skeletal muscle cells. cytPTPepsilon was overexpressed by using pBABE retroviral expression vectors. In addition, we inhibited cytPTPepsilon by RNA silencing. We found that insulin induced rapid association of cytPTPepsilon with IR. Interestingly, this association appeared to occur in the plasma membrane and on stimulation with insulin the two proteins internalized together. Moreover, it appeared that almost all internalized IR was associated with cytPTPepsilon. We found that knockdown of cytPTPepsilon by RNA silencing increased insulin-induced tyrosine phosphorylation of IR and IR substrate (IRS)-1 as well as phosphorylation of protein kinase B and glycogen synthase kinase-3 and insulin-induced stimulation of glucose uptake. Moreover, overexpression of wild-type cytPTPepsilon reduced insulin-induced tyrosine phosphorylation of IR, IRS-1, and phosphorylation of protein kinase B and glycogen synthase kinase-3 and insulin-induced stimulation of glucose uptake. Finally, insulin-induced tyrosine phosphorylation of IR and IRS-1 was greater in skeletal muscle from mice lacking the cytPTPepsilon gene than that from wild-type control animals. We conclude that cytPTPepsilon serves as another major candidate negative regulator of IR signaling in skeletal muscle.
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Affiliation(s)
- Shlomit Aga-Mizrachi
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel
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Picha KM, Patel SS, Mandiyan S, Koehn J, Wennogle LP. The role of the C-terminal domain of protein tyrosine phosphatase-1B in phosphatase activity and substrate binding. J Biol Chem 2006; 282:2911-7. [PMID: 17135270 DOI: 10.1074/jbc.m610096200] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Protein tyrosine phosphatase 1B (PTP-1B) has been implicated in the regulation of the insulin receptor. Dephosphorylation of the insulin receptor results in decreased insulin signaling and thus decreased glucose uptake. PTP-1B-/- mice have increased insulin sensitivity and are resistant to weight gain when fed a high fat diet, validating PTP-1B as a potential target for the treatment of type 2 diabetes. Many groups throughout the world have been searching for selective inhibitors for PTP-1B, and most of them target inhibitors to PTP-1B-(1-298), the N-terminal catalytic domain of the enzyme. However, the C-terminal domain is quite large and could influence the activity of the enzyme. Using two constructs of PTP-1B and a phosphopeptide as substrate, steady state assays showed that the presence of the C-terminal domain decreased both the Km and the k(cat) 2-fold. Pre-steady state kinetic experiments showed that the presence of the C-terminal domain improved the affinity of the enzyme for a phosphopeptide 2-fold, primarily because the off-rate was slower. This suggests that the C-terminal domain of PTP-1B may contact the phosphopeptide in some manner, allowing it to remain at the active site longer. This could be useful when screening libraries of compounds for inhibitors of PTP-1B. A compound that is able to make contacts with the C-terminal domain of PTP-1B would not only have a modest improvement in affinity but may also provide for specificity over other phosphatases.
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Affiliation(s)
- Kristen M Picha
- Metabolic and Cardiovascular Diseases Research, Novartis Institutes for Biomedical Research, Cambridge, Massachusetts 02139, USA
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Hernández MV, Sala MGD, Balsamo J, Lilien J, Arregui CO. ER-bound PTP1B is targeted to newly forming cell-matrix adhesions. J Cell Sci 2006; 119:1233-43. [PMID: 16522684 DOI: 10.1242/jcs.02846] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Here, we define the mechanism through which protein tyrosine phosphatase 1B (PTP1B) is targeted to cell-matrix adhesion sites. Green fluorescent protein (GFP)-labeled PTP1B bearing the substrate-trapping mutation D181A was found in punctate structures in lamellae. The puncta co-localized with focal adhesion kinase (FAK) and Src, and defined the distal tips of cell-matrix adhesion sites identified with paxillin and vinculin. PTP1B is largely associated with the external face of the endoplasmic reticulum (ER) and the puncta develop from ER projections over cell-matrix adhesion sites, a process dependent on microtubules. Deletion of the ER-targeting sequence resulted in cytosolic localization and altered the distribution of PTP1B at cell-matrix foci, whereas mutations disrupting interactions with Src homology 3 (SH3) domains, and the insulin and cadherin receptors had no effect. PTP1B recognizes substrates within forming adhesion foci as revealed by its preferential association with paxillin as opposed to zyxin-containing foci. Our results suggest that PTP1B targets to immature cell-matrix foci in newly forming lamellae by dynamic extensions of the ER and contributes to the maturation of these sites.
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Affiliation(s)
- Mariana V Hernández
- Instituto de Investigaciones Biotecnológicas, IIB-INTECH, Universidad de San Martín, 1650 San Martín, Buenos Aires, Argentina
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Asante-Appiah E, Patel S, Desponts C, Taylor JM, Lau C, Dufresne C, Therien M, Friesen R, Becker JW, Leblanc Y, Kennedy BP, Scapin G. Conformation-assisted Inhibition of Protein-tyrosine Phosphatase-1B Elicits Inhibitor Selectivity over T-cell Protein-tyrosine Phosphatase. J Biol Chem 2006; 281:8010-5. [PMID: 16407290 DOI: 10.1074/jbc.m511827200] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
PTP-1B represents an attractive target for the treatment of type 2 diabetes and obesity. Given the role that protein phosphatases play in the regulation of many biologically relevant processes, inhibitors against PTP-1B must be not only potent, but also selective. It has been extremely difficult to synthesize inhibitors that are selective over the highly homologous TCPTP. We have successfully exploited the conservative Leu119 to Val substitution between the two enzymes to synthesize a PTP-1B inhibitor that is an order of magnitude more selective over TCPTP. Structural analyses of PTP-1B/inhibitor complexes show a conformation-assisted inhibition mechanism as the basis for selectivity. Such an inhibitory mechanism may be applicable to other homologous enzymes.
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Affiliation(s)
- Ernest Asante-Appiah
- Department of Biochemistry and Molecular Biology, Merck Frosst Center for Therapeutic Research, Pointe-Claire, Dorval, Quebec H9R 4P8, Canada.
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Mehdi MZ, Srivastava AK. Organo-vanadium compounds are potent activators of the protein kinase B signaling pathway and protein tyrosine phosphorylation: mechanism of insulinomimesis. Arch Biochem Biophys 2005; 440:158-64. [PMID: 16055077 DOI: 10.1016/j.abb.2005.06.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2005] [Accepted: 06/14/2005] [Indexed: 11/21/2022]
Abstract
Organo-vanadium compounds (OVC) have been shown to be more effective than inorganic vanadium compounds in ameliorating glucose homeostasis and insulin resistance in rodent models of diabetes mellitus. However, the precise molecular mechanism of OVC efficiency remains poorly defined. Since inorganic vanadium compounds have been found to activate several key components of the insulin signaling cascade, such as protein kinase B (PKB), the objective of the present study was to investigate if stimulation of PKB and its downstream target glycogen synthase kinase-3 (GSK-3), are responsible for the more potent insulinomimetic effects of OVC. Among several vanadium compounds tested, vanadium (IV) oxo bis (acetylacetonate) and vanadium (IV) oxo bis(maltolato) markedly induced the phosphorylation of PKB as well as GSK-3beta compared to vanadyl sulfate (VS), an inorganic vanadium salts in Chinese hamster ovary cells overexpressing the insulin receptor (IR). Furthermore, the OVC were stronger inhibitors of protein tyrosine phosphatase (PTPase) activity than VS. The higher PTPase inhibitory potential of the OVC was associated with more robust tyrosine phosphorylation of several cellular proteins, including the IRbeta subunit and insulin receptor substrate-1 (IRS-1). In addition, greater IRS-1/p85alpha interaction was elicited by the OVC than by VS. These data indicate that the higher PTPase inhibitory potential of OVC translates into greater phosphorylation of PKB and GSK-3beta, which, in turn, may contribute to a more potent effect of OVC on glucose homeostasis.
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Affiliation(s)
- Mohamad Z Mehdi
- Laboratory of Cell Signaling, Research Centre, Centre Hospitalier de l'Université de Montréal (CHUM)-Hôtel-Dieu, Canada
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