1
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Zhang Y, Liu H, Lv T, Xiao M, Gao G. Protein Tyrosine Phosphatase 1B Inhibitors of Pueraria lobata Based on the Spectrum-Effect Relationship by Q-Marker Selection. Molecules 2024; 29:2731. [PMID: 38930797 PMCID: PMC11207073 DOI: 10.3390/molecules29122731] [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: 04/29/2024] [Revised: 05/24/2024] [Accepted: 06/03/2024] [Indexed: 06/28/2024] Open
Abstract
Pueraria lobata (P. lobata), a traditional anti-diabetic medicine mainly composed of flavonoids and isoflavones, has a long history in diabetes treatment in China. However, the anti-diabetic active component is still unclear. Recently, protein tyrosine phosphatase 1B (PTP1B) has been a hot therapeutic target by negatively regulating insulin signaling pathways. In this study, the spectrum-effect relationship analysis method was first used to identify the active components of P. lobata that inhibit PTP1B. The fingerprints of 12 batches of samples were established using high-performance liquid chromatography (HPLC), and sixty common peaks were identified. Meanwhile, twelve components were identified by a comparison with the standards. The inhibition of PTP1B activity was studied in vitro by using the p-nitrophenol method, and the partial least squares discriminant analysis, grey relational analysis, bivariate correlation analysis, and cluster analysis were used to analyze the bioactive compounds in P. lobata. Peaks 6, 9 (glycitin), 11 (genistin), 12 (4'-methoxypuerarin), 25, 34, 35, 36, 53, and 59 were considered as potentially active substances that inhibit PTP1B. The in vitro PTP1B inhibitory activity was confirmed by glycitin, genistin, and 4'-methoxypuerarin. The IC50s of the three compounds were 10.56 ± 0.42 μg/mL, 16.46 ± 0.29 μg/mL, and 9.336 ± 0.56 μg/mL, respectively, indicating the obvious PTP1B inhibitory activity. In brief, we established an effective method to identify PTP1B enzyme inhibitors in P. lobata, which is helpful in clarifying the material basis of P. lobata on diabetes. Additionally, it is evident that the spectrum-effect relationship method serves as an efficient approach for identifying active compounds, and this study can also serve as a reference for screening bioactive constituents in traditional Chinese medicine.
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Affiliation(s)
- Yong Zhang
- School of Pharmacy, Jining Medical University, Rizhao 276826, China;
| | - Haipeng Liu
- School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China; (H.L.); (T.L.); (M.X.)
| | - Tianci Lv
- School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China; (H.L.); (T.L.); (M.X.)
| | - Mengqian Xiao
- School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China; (H.L.); (T.L.); (M.X.)
| | - Guihua Gao
- School of Pharmacy, Jining Medical University, Rizhao 276826, China;
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2
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Aguilar-Ramírez E, Reyes-Pérez V, Fajardo-Hernández CA, Quezada-Suaste CD, Carreón-Escalante M, Merlin-Lucas V, Quiroz-García B, Granados-Soto V, Rivera-Chávez J. Harnessing the Reactivity of Duclauxin toward Obtaining hPTP1B 1-400 Inhibitors. J Med Chem 2023; 66:16222-16234. [PMID: 38051546 DOI: 10.1021/acs.jmedchem.3c01594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Duclauxin (1) from Talaromyces sp. IQ-313 was reported as a putative allosteric modulator of human recombinant protein tyrosine phosphatase 1B (400 amino acids) (hPTP1B1-400), a validated target for the treatment of type II diabetes. Based on these findings, a one-strain-many-compound (OSMAC) experiment on the IQ-313 strain generated derivatives 5a, 6, and 7. Moreover, a one-/two-step semisynthetic approach guided by docking toward hPTP1B1-400 produced 38 analogs, a series (A) incorporating a lactam functionalization at C-1 (8a-15a, 36a, and 37a) and a series (B) containing a lactam at C-1 and an extra unsaturation between C-7 and C-8 (5b, 11b-37b). In vitro evaluation and structure-activity relationship (SAR) analysis revealed that analogs from the B series are up to 10-fold more active than 1 and derivatives from the A series. Furthermore, duclauxin (1) and 36b were assessed for their potential acute toxicity, estimating their LD50 to be higher than 300 mg/kg. Moreover, 36b significantly reduced glycemia in an insulin tolerance test in mice, suggesting that its mechanism of action is through the PTP1B inhibition.
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Affiliation(s)
- Enrique Aguilar-Ramírez
- Department of Natural Products, Institute of Chemistry, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Valeria Reyes-Pérez
- Department of Natural Products, Institute of Chemistry, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Carlos A Fajardo-Hernández
- Department of Natural Products, Institute of Chemistry, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Carlos D Quezada-Suaste
- Department of Natural Products, Institute of Chemistry, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Mario Carreón-Escalante
- Department of Natural Products, Institute of Chemistry, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Verenice Merlin-Lucas
- Department of Natural Products, Institute of Chemistry, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Beatriz Quiroz-García
- Department of Natural Products, Institute of Chemistry, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Vinicio Granados-Soto
- Pharmacobiology Department, Centro de Investigación y de Estudios Avanzados, Sede Sur, Mexico City 14330, Mexico
| | - José Rivera-Chávez
- Department of Natural Products, Institute of Chemistry, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
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3
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Coronell-Tovar A, Cortés-Benítez F, González-Andrade M. The importance of including the C-terminal domain of PTP1B 1-400 to identify potential antidiabetic inhibitors. J Enzyme Inhib Med Chem 2023; 38:2170369. [PMID: 36997321 PMCID: PMC10064822 DOI: 10.1080/14756366.2023.2170369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2023] Open
Abstract
In the present work, we studied the inhibitory and kinetic implications of classical PTP1B inhibitors (chlorogenic acid, ursolic acid, suramin) using three enzyme constructs (hPTP1B1-285, hPTP1B1-321, and hPTP1B1-400). The results indicate that the unstructured region of PTP1B (300-400 amino acids) is very important both to obtain optimal inhibitory results and propose classical inhibition mechanisms (competitive or non-competitive) through kinetic studies. The IC50 calculated for ursolic acid and suramin using hPTP1B1-400 are around four and three times lower to the short form of the enzyme, the complete form of PTP1B, the one found in the cytosol (in vivo). On the other hand, we highlight the studies of enzymatic kinetics using the hPTP1B1-400 to know the type of enzymatic inhibition and to be able to direct docking studies, where the unstructured region of the enzyme can be one more option for binding compounds with inhibitory activity.
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Affiliation(s)
- Andrea Coronell-Tovar
- Departamento de Bioquímica, Facultad de Medicina, Laboratorio de Biosensores y Modelaje molecular, Universidad Nacional Autónoma de México, Ciudad de México, México
| | - Francisco Cortés-Benítez
- Departamento de Sistemas Biológicos, División de Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Xochimilco (UAM-X), Ciudad de México, México
| | - Martin González-Andrade
- Departamento de Bioquímica, Facultad de Medicina, Laboratorio de Biosensores y Modelaje molecular, Universidad Nacional Autónoma de México, Ciudad de México, México
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4
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Chirgadze YN, Battaile KP, Likhachev IV, Balabaev NK, Gordon RD, Romanov V, Lin A, Karisch R, Lam R, Ruzanov M, Brazhnikov EV, Pai EF, Neel BG, Chirgadze NY. Signal transfer in human protein tyrosine phosphatase PTP1B from allosteric inhibitor P00058. J Biomol Struct Dyn 2022; 40:13823-13832. [PMID: 34705594 DOI: 10.1080/07391102.2021.1994879] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Protein tyrosine phosphatases constitute a family of cytosolic and receptor-like signal transducing enzymes that catalyze the hydrolysis of phospho-tyrosine residues of phosphorylated proteins. PTP1B, encoded by PTPN1, is a key negative regulator of insulin and leptin receptor signaling, linking it to two widespread diseases: type 2 diabetes mellitus and obesity. Here, we present crystal structures of the PTP1B apo-enzyme and a complex with a newly identified allosteric inhibitor, 2-(2,5-dimethyl-pyrrol-1-yl)-5-hydroxy-benzoic acid, designated as P00058. The inhibitor binding site is located about 18 Å away from the active center. However, the inhibitor causes significant re-arrangements in the active center of enzyme: residues 45-50 of catalytic Tyr-loop are shifted at their Cα-atom positions by 2.6 to 5.8 Å. We have identified an event of allosteric signal transfer from the inhibitor to the catalytic area using molecular dynamic simulation. Analyzing change of complex structure along the fluctuation trajectory we have found the large Cα-atom shifts in external strand, residues 25-40, which occur at the same time with the shifts in adjacent catalytic p-Tyr-loop. Coming of the signal to this loop arises due to dynamic fluctuation of protein structure at about 4.0 nanoseconds after the inhibitor takes up its space. Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Yuri N Chirgadze
- Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region, Russia
| | | | - Ilya V Likhachev
- Institute of Mathematical Problems of Biology, Branch of Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Pushchino, Moscow Region, Russia
| | - Nikolay K Balabaev
- Institute of Mathematical Problems of Biology, Branch of Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Pushchino, Moscow Region, Russia
| | - Roni D Gordon
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network, Toronto, ON, Canada
| | - Vladimir Romanov
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network, Toronto, ON, Canada
| | - Andres Lin
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network, Toronto, ON, Canada
| | - Robert Karisch
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network, Toronto, ON, Canada
| | - Robert Lam
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network, Toronto, ON, Canada
| | - Max Ruzanov
- Molecular Structure and Design, Molecular Discovery Technologies, Bristol-Myers Squibb Research & Development, Princeton, NJ, USA
| | - Evgeniy V Brazhnikov
- Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region, Russia
| | - Emil F Pai
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network, Toronto, ON, Canada.,Department of Biochemistry and Medical Biophysics, University of Toronto, Toronto, ON, Canada
| | - Benjamin G Neel
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network, Toronto, ON, Canada.,Laura and Isaac Perlmutter Cancer Center, New York University Grossman School of Medicine, NYU Langone Health, NY, USA
| | - Nickolay Y Chirgadze
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network, Toronto, ON, Canada.,X-CHIP Technologies Inc., Toronto, ON, Canada
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5
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Bacterial Protein Tyrosine Phosphatases as Possible Targets for Antimicrobial Therapies in Response to Antibiotic Resistance. Antioxidants (Basel) 2022; 11:antiox11122397. [PMID: 36552605 PMCID: PMC9774629 DOI: 10.3390/antiox11122397] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/21/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022] Open
Abstract
The review is focused on the bacterial protein tyrosine phosphatases (PTPs) utilized by bacteria as virulence factors necessary for pathogenicity. The inhibition of bacterial PTPs could contribute to the arrest of the bacterial infection process. This mechanism could be utilized in the design of antimicrobial therapy as adjuvants to antibiotics. The review summaries knowledge on pathogenic bacterial protein tyrosine phosphatases (PTPs) involved in infection process, such as: PTPA and PTPB from Staphylococcus aureus and Mycobacterium tuberculosis; SptP from Salmonella typhimurium; YopH from Yersinia sp. and TbpA from Pseudomonas aeruginosa. The review focuses also on the potential inhibitory compounds of bacterial virulence factors and inhibitory mechanisms such as the reversible oxidation of tyrosine phosphatases.
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6
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Friedman AJ, Liechty ET, Kramer L, Sarkar A, Fox JM, Shirts MR. Allosteric Inhibition of PTP1B by a Nonpolar Terpenoid. J Phys Chem B 2022; 126:8427-8438. [PMID: 36223525 PMCID: PMC10040085 DOI: 10.1021/acs.jpcb.2c05423] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Protein tyrosine phosphatases (PTPs) are promising drug targets for treating a wide range of diseases such as diabetes, cancer, and neurological disorders, but their conserved active sites have complicated the design of selective therapeutics. This study examines the allosteric inhibition of PTP1B by amorphadiene (AD), a terpenoid hydrocarbon that is an unusually selective inhibitor. Molecular dynamics (MD) simulations carried out in this study suggest that AD can stably sample multiple neighboring sites on the allosterically influential C-terminus of the catalytic domain. Binding to these sites requires a disordered α7 helix, which stabilizes the PTP1B-AD complex and may contribute to the selectivity of AD for PTP1B over TCPTP. Intriguingly, the binding mode of AD differs from that of the most well-studied allosteric inhibitor of PTP1B. Indeed, biophysical measurements and MD simulations indicate that the two molecules can bind simultaneously. Upon binding, both inhibitors destabilize the α7 helix by disrupting interactions at the α3-α7 interface and prevent the formation of hydrogen bonds that facilitate closure of the catalytically essential WPD loop. These findings indicate that AD is a promising scaffold for building allosteric inhibitors of PTP1B and illustrate, more broadly, how unfunctionalized terpenoids can engage in specific interactions with protein surfaces.
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Affiliation(s)
- Anika J Friedman
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado80309, United States
| | - Evan T Liechty
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado80309, United States
| | - Levi Kramer
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado80309, United States
| | - Ankur Sarkar
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado80309, United States
| | - Jerome M Fox
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado80309, United States
| | - Michael R Shirts
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado80309, United States
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7
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Awal MA, Nur SM, Al Khalaf AK, Rehan M, Ahmad A, Hosawi SBI, Choudhry H, Khan MI. Structural-Guided Identification of Small Molecule Inhibitor of UHRF1 Methyltransferase Activity. Front Genet 2022; 13:928884. [PMID: 35991572 PMCID: PMC9382028 DOI: 10.3389/fgene.2022.928884] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 06/17/2022] [Indexed: 11/13/2022] Open
Abstract
Ubiquitin-like containing plant homeodomain Ring Finger 1 (UHRF1) protein is recognized as a cell-cycle-regulated multidomain protein. UHRF1 importantly manifests the maintenance of DNA methylation mediated by the interaction between its SRA (SET and RING associated) domain and DNA methyltransferase-1 (DNMT1)-like epigenetic modulators. However, overexpression of UHRF1 epigenetically responds to the aberrant global methylation and promotes tumorigenesis. To date, no potential molecular inhibitor has been studied against the SRA domain. Therefore, this study focused on identifying the active natural drug-like candidates against the SRA domain. A comprehensive set of in silico approaches including molecular docking, molecular dynamics (MD) simulation, and toxicity analysis was performed to identify potential candidates. A dataset of 709 natural compounds was screened through molecular docking where chicoric acid and nystose have been found showing higher binding affinities to the SRA domain. The MD simulations also showed the protein ligand interaction stability of and in silico toxicity analysis has also showed chicoric acid as a safe and nontoxic drug. In addition, chicoric acid possessed a longer interaction time and higher LD50 of 5000 mg/kg. Moreover, the global methylation level (%5 mC) has been assessed after chicoric acid treatment was in the colorectal cancer cell line (HCT116) at different doses. The result showed that 7.5 µM chicoric acid treatment reduced methylation levels significantly. Thus, the study found chicoric acid can become a possible epidrug-like inhibitor against the SRA domain of UHRF1 protein.
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Affiliation(s)
- Md Abdul Awal
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Suza Mohammad Nur
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Ali Khalaf Al Khalaf
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mohd Rehan
- King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Aamir Ahmad
- Translational Research Institute, Hamad Medical Corporation, Doha, Qatar
| | - Salman Bakr I. Hosawi
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Hani Choudhry
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
- Centre of Artificial Intelligence for Precision Medicines, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mohammad Imran Khan
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
- Centre of Artificial Intelligence for Precision Medicines, King Abdulaziz University, Jeddah, Saudi Arabia
- *Correspondence: Mohammad Imran Khan,
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8
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Recent Updates on Development of Protein-Tyrosine Phosphatase 1B Inhibitors for Treatment of Diabetes, Obesity and Related Disorders. Bioorg Chem 2022; 121:105626. [DOI: 10.1016/j.bioorg.2022.105626] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 12/19/2021] [Accepted: 01/13/2022] [Indexed: 01/30/2023]
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9
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Martínez-Aldino IY, Villaseca-Murillo M, Morales-Jiménez J, Rivera-Chávez J. Absolute configuration and protein tyrosine phosphatase 1B inhibitory activity of xanthoepocin, a dimeric naphtopyrone from Penicillium sp. IQ-429. Bioorg Chem 2021; 115:105166. [PMID: 34384957 DOI: 10.1016/j.bioorg.2021.105166] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 05/27/2021] [Accepted: 07/08/2021] [Indexed: 12/19/2022]
Abstract
Protein tyrosine phosphatase 1B (PTP1B) is an active target for developing drugs to treat type II diabetes, obesity, and cancer. However, in the past, research programs targeting this enzyme focused on discovering inhibitors of truncated models (hPTP1B1-282, hPTP1B1-298, or hPTP1B1-321), losing valuable information about the ligands' mechanism of inhibition and selectivity. Nevertheless, finding an allosteric site in hPTP1B1-321, and the full-length (hPTP1B1-400) protein expression, have shifted the strategies to discover new PTP1B inhibitors. Accordingly, as part of a research program directed at finding non-competitive inhibitors of hPTP1B1-400 from Pezizomycotina, the extract of Penicillium sp. (IQ-429) was chemically investigated. This study led to xanthoepocin (1) isolation, which was elucidated by means of spectroscopic and spectrometric data. The absolute configuration of 1 was determined to be 7R8S9R7'R8'S9'R by comparing the theoretical and experimental ECD spectra and by GIAO-NMR DP4 + statistical analysis. Xanthoepocin (1) inhibited the phosphatase activity of hPTP1B1-400 (IC50 value of 8.8 ± 1.0 µM) in a mixed type fashion, with ki and αki values of 5.5 and 6.6 μM, respectively. Docking xanthoepocin (1) with a homologated model of hPTP1B1-400 indicated that it binds in a pocket different from the catalytic triad at the interface of the N and C-terminal domains. Molecular dynamics (MD) simulations showed that 1 locks the WPD loop of hPTP1B1-400 in a closed conformation, avoiding substrate binding, products release, and catalysis, suggesting an allosteric modulation triggered by large-scale conformational and dynamics changes. Intrinsic quenching fluorescence experiments indicated that 1 behaves like a static quencher of hPTP1B1-400 (KSV = 1.1 × 105 M-1), and corroborated that it binds to the enzyme with an affinity constant (ka) of 3.7 × 105 M-1. Finally, the drug-likeness and medicinal chemistry friendliness of 1 were predicted with SwissADME.
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Affiliation(s)
- Ingrid Y Martínez-Aldino
- Departamento de Productos Naturales, Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria 04510, Ciudad de México, Mexico
| | - Martha Villaseca-Murillo
- Departamento de Productos Naturales, Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria 04510, Ciudad de México, Mexico
| | - Jesús Morales-Jiménez
- CONACYT-Consorcio de Investigación, Innovación y Desarrollo para las Zonas Áridas (CIIDZA), Instituto Potosino de Investigación Científica y Tecnológica A. C., Camino a la Presa San José 2055, Lomas 4a sección, 78216 San Luis Potosí, Mexico.
| | - José Rivera-Chávez
- Departamento de Productos Naturales, Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria 04510, Ciudad de México, Mexico.
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10
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Pietrzyk N, Zakłos-Szyda M, Koziołkiewicz M, Podsędek A. Viburnum opulus L. fruit phenolic compounds protect against FFA-induced steatosis of HepG2 cells via AMPK pathway. J Funct Foods 2021. [DOI: 10.1016/j.jff.2021.104437] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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11
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Yousof Ali M, Jannat S, Mizanur Rahman M. Investigation of C-glycosylated apigenin and luteolin derivatives’ effects on protein tyrosine phosphatase 1B inhibition with molecular and cellular approaches. ACTA ACUST UNITED AC 2021. [DOI: 10.1016/j.comtox.2020.100141] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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12
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Fate of nano-phytosomes containing bioactive compounds of Echinacea extract in an acidic food beverage. FOOD STRUCTURE 2021. [DOI: 10.1016/j.foostr.2021.100177] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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13
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de Souza AC, Mori M, Sens L, Rocha RF, Tizziani T, de Souza LF, Domeneghini Chiaradia-Delatorre L, Botta M, Nunes RJ, Terenzi H, Menegatti AC. A chalcone derivative binds a putative allosteric site of YopH: Inhibition of a virulence factor of Yersinia. Bioorg Med Chem Lett 2020; 30:127350. [DOI: 10.1016/j.bmcl.2020.127350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 06/08/2020] [Accepted: 06/09/2020] [Indexed: 01/01/2023]
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14
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Rocha RF, Rodrigues T, Menegatti ACO, Bernardes GJL, Terenzi H. The antidiabetic drug lobeglitazone has the potential to inhibit PTP1B activity. Bioorg Chem 2020; 100:103927. [PMID: 32422389 DOI: 10.1016/j.bioorg.2020.103927] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 04/03/2020] [Accepted: 05/08/2020] [Indexed: 12/13/2022]
Abstract
Protein tyrosine phosphatase 1B (PTP1B) is considered a potential therapeutic target for the treatment of type 2 diabetes mellitus (T2DM), since this enzyme plays a significant role to down-regulate insulin and leptin signalling and its over expression has been implicated in the development of insulin resistance, T2DM and obesity. Some thiazolidinediones (TZD) derivatives have been reported as promising PTP1B inhibitors with anti hyperglycemic effects. Recently, lobeglitazone, a new TZD, was described as an antidiabetic drug that targets the PPAR-γ (peroxisome γ proliferator-activated receptor) pathway, but no information on its effects on PTP1B have been reported to date. We investigated the effects of lobeglitazone on PTP1B activity in vitro. Surprisingly, lobeglitazone led to moderate inhibition on PTP1B (IC50 42.8 ± 3.8 µM) activity and to a non-competitive reversible mechanism of action. As lobeglitazone inhibits PTP1B activity in vitro, we speculate that it could also target PTP1B signalling pathway in vivo and thus contribute to potentiate its antidiabetic effects.
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Affiliation(s)
- Ruth F Rocha
- Centro de Biologia Molecular Estrutural, Departamento de Bioquímica, Universidade Federal de Santa Catarina, Campus Trindade, 88040-900 Florianópolis, SC, Brazil
| | - Tiago Rodrigues
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Avenida Professor Egas Moniz, 1649-028 Lisbon, Portugal
| | - Angela C O Menegatti
- Centro de Biologia Molecular Estrutural, Departamento de Bioquímica, Universidade Federal de Santa Catarina, Campus Trindade, 88040-900 Florianópolis, SC, Brazil; Universidade Federal do Piauí, CPCE, 64900-000 Bom Jesus, PI, Brazil.
| | - Gonçalo J L Bernardes
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Avenida Professor Egas Moniz, 1649-028 Lisbon, Portugal; Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW Cambridge, UK
| | - Hernán Terenzi
- Centro de Biologia Molecular Estrutural, Departamento de Bioquímica, Universidade Federal de Santa Catarina, Campus Trindade, 88040-900 Florianópolis, SC, Brazil
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15
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The bitter Asteraceae: An interesting approach to delay the metabolic syndrome progression. NFS JOURNAL 2020. [DOI: 10.1016/j.nfs.2020.01.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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16
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Zhang X, Mao J, Li W, Koike K, Wang J. Improved 3D-QSAR prediction by multiple-conformational alignment: A case study on PTP1B inhibitors. Comput Biol Chem 2019; 83:107134. [DOI: 10.1016/j.compbiolchem.2019.107134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Revised: 08/01/2019] [Accepted: 09/18/2019] [Indexed: 10/25/2022]
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SarathKumar B, Lakshmi BS. In silico investigations on the binding efficacy and allosteric mechanism of six different natural product compounds towards PTP1B inhibition through docking and molecular dynamics simulations. J Mol Model 2019; 25:272. [PMID: 31451955 DOI: 10.1007/s00894-019-4172-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Accepted: 08/16/2019] [Indexed: 01/07/2023]
Abstract
Protein tyrosine phosphatase 1B (PTP1B) is a major negative regulator of both the insulin and leptin receptor phosphorylation which impacts insulin sensitivity and hence is a major therapeutic target for the treatment of type 2 diabetes and obesity. Identification of PTP1B active site inhibitors has proven to be difficult with none of them clearing the phase II clinical trials. Since the conventional methods of targeting the active site of PTP1B have failed to bring out effective PTP1B inhibitors as potential drugs, recent studies are focussing on identification of potential allosteric inhibitors of PTP1B with better specificity and activity. A complete understanding of the molecular features dynamically involved for allosteric site inhibition is still uncertain, and hence, this study is aimed at evaluating the allosteric effectiveness of six natural compounds isolated from medicinal plants which showed in vitro antidiabetic activity along with PTP1B inhibition. The allosteric binding and inhibition of these compounds are studied using computational methods such as molecular docking, homology modelling and molecular dynamics simulations for a timescale of 100 ns. The molecular dynamics simulations of native PTP1B, along with the modelled allosteric α-7 helix, for a timescale of 100 ns, revealed the spontaneous transition of the native PTP1B from open WPD loop (active) to closed WPD loop (inactive) conformations during the simulations. Similar dynamics was observed in the presence of the active site substrate pTyr (phosphotyrosine), whereas this transition was inhibited in the presence of the compounds at the allosteric site. Results of molecular dynamics simulations and principal component analysis reveal that the hindrance to WPD loop was mediated through structural interactions between the allosteric α-helical triad with Loop11 and WPD loop. The MM-PBSA (Molecular Mechanics - Poisson Boltzmann with Surface Area solvation) binding energy results along with H-bonding analysis show the possible allosteric inhibition of Aloe emodin glycoside (AEG), 3β-taraxerol (3BT), chlorogenic acid (CGA) and cichoric acid (CHA) to be higher in comparison with (3β)-stigmast-5-en-3-ol (SGS) and methyl lignocerate (MLG). The interaction analysis was further validated by scoring the allosteric complexes before and after MD simulations using Glide. These findings on spontaneous PTP1B fluctuations and the allosteric interactions provide a better insight into the role of PTP1B fluctuations in impacting the binding energy of allosteric inhibitors towards optimal drug designing for PTP1B. Graphical abstract.
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Affiliation(s)
- Baskaran SarathKumar
- Department of Biotechnology, Anna University, Chennai, Tamil Nadu, 600 025, India
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18
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Przychodzen P, Kuban-Jankowska A, Wyszkowska R, Barone G, Bosco GL, Celso FL, Kamm A, Daca A, Kostrzewa T, Gorska-Ponikowska M. PTP1B phosphatase as a novel target of oleuropein activity in MCF-7 breast cancer model. Toxicol In Vitro 2019; 61:104624. [PMID: 31419504 DOI: 10.1016/j.tiv.2019.104624] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 07/30/2019] [Accepted: 08/12/2019] [Indexed: 02/06/2023]
Abstract
Phosphatase PTP1B has become a therapeutic target for the treatment of type 2-diabetes, whereas recent studies have revealed that PTP1B plays a pivotal role in pathophysiology and development of breast cancer. Oleuropein is a natural, phenolic compound with anticancer activity. The aim of this study was to address the question whether PTP1B constitutes a target for oleuropein in breast cancer MCF-7 cells. The cellular MCF-7 breast cancer model was used in the study. The experiments were performed using cellular viability tests, Elisa assays, immunoprecipitation, flow cytometry analyses and computer modelling. Herein, we evidenced that the reduced activity of phosphatase PTP1B after treatment with oleuropein is strictly correlated with decreased MCF-7 cellular viability and cell cycle arrest. These results provide new insight into further research on oleuropein and possible role of the compound in adjuvant treatment of breast cancer.
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Affiliation(s)
- Paulina Przychodzen
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland
| | | | - Roksana Wyszkowska
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland
| | - Giampaolo Barone
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, Palermo, Italy
| | - Giosuè Lo Bosco
- Department of Mathematics and Computer Science, University of Palermo, Palermo, Italy; The Euro-Mediterranean Institute of Science and Technology, Palermo, Italy
| | - Fabrizio Lo Celso
- Department of Physics and Chemistry 'Emilio Segrè', University of Palermo, Palermo, Italy
| | - Anna Kamm
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland
| | - Agnieszka Daca
- Department of Pathology and Experimental Rheumatology, Medical University of Gdansk, Gdansk, Poland
| | - Tomasz Kostrzewa
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland
| | - Magdalena Gorska-Ponikowska
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland; Institute of Biomaterials and Biomolecular Systems, Department of Biophysics, University of Stuttgart, Stuttgart, Germany; The Euro-Mediterranean Institute of Science and Technology, Palermo, Italy.
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Peng Y, Sun Q, Park Y. The Bioactive Effects of Chicoric Acid As a Functional Food Ingredient. J Med Food 2019; 22:645-652. [DOI: 10.1089/jmf.2018.0211] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Affiliation(s)
- Ye Peng
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Quancai Sun
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Yeonhwa Park
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
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20
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Shinde RN, Kumar GS, Eqbal S, Sobhia ME. Screening and identification of potential PTP1B allosteric inhibitors using in silico and in vitro approaches. PLoS One 2018; 13:e0199020. [PMID: 29912965 PMCID: PMC6005499 DOI: 10.1371/journal.pone.0199020] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 04/12/2018] [Indexed: 12/25/2022] Open
Abstract
Protein tyrosine phosphatase 1B (PTP1B) is a validated therapeutic target for Type 2 diabetes due to its specific role as a negative regulator of insulin signaling pathways. Discovery of active site directed PTP1B inhibitors is very challenging due to highly conserved nature of the active site and multiple charge requirements of the ligands, which makes them non-selective and non-permeable. Identification of the PTP1B allosteric site has opened up new avenues for discovering potent and selective ligands for therapeutic intervention. Interactions made by potent allosteric inhibitor in the presence of PTP1B were studied using Molecular Dynamics (MD). Computationally optimized models were used to build separate pharmacophore models of PTP1B and TCPTP, respectively. Based on the nature of interactions the target residues offered, a receptor based pharmacophore was developed. The pharmacophore considering conformational flexibility of the residues was used for the development of pharmacophore hypothesis to identify potentially active inhibitors by screening large compound databases. Two pharmacophore were successively used in the virtual screening protocol to identify potential selective and permeable inhibitors of PTP1B. Allosteric inhibition mechanism of these molecules was established using molecular docking and MD methods. The geometrical criteria values confirmed their ability to stabilize PTP1B in an open conformation. 23 molecules that were identified as potential inhibitors were screened for PTP1B inhibitory activity. After screening, 10 molecules which have good permeability values were identified as potential inhibitors of PTP1B. This study confirms that selective and permeable inhibitors can be identified by targeting allosteric site of PTP1B.
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Affiliation(s)
- Ranajit Nivrutti Shinde
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research, S.A.S. Nagar, Punjab, India
| | - G. Siva Kumar
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research, S.A.S. Nagar, Punjab, India
| | - Shahbaz Eqbal
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research, S.A.S. Nagar, Punjab, India
| | - M. Elizabeth Sobhia
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research, S.A.S. Nagar, Punjab, India
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21
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Mi Y, Zhang W, Tian H, Li R, Huang S, Li X, Qi G, Liu X. EGCG evokes Nrf2 nuclear translocation and dampens PTP1B expression to ameliorate metabolic misalignment under insulin resistance condition. Food Funct 2018; 9:1510-1523. [PMID: 29423494 DOI: 10.1039/c7fo01554b] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
As a major nutraceutical component of green tea (-)-epigallocatechin-3-gallate (EGCG) has attracted interest from scientists due to its well-documented antioxidant and antiobesity bioactivities. In the current study, we aimed to investigate the protective effect of EGCG on metabolic misalignment and in balancing the redox status in mice liver and HepG2 cells under insulin resistance condition. Our results indicated that EGCG accelerates the glucose uptake and evokes IRS-1/Akt/GLUT2 signaling pathway via dampening the expression of protein tyrosine phosphatase 1B (PTP1B). Consistently, ectopic expression of PTP1B by Ad-PTP1B substantially impaired EGCG-elicited IRS-1/Akt/GLUT2 signaling pathway. Moreover, EGCG co-treatment stimulated nuclear translocation of Nrf2 by provoking P13K/AKT signaling pathway and thus modulated the downstream expressions of antioxidant enzymes such as HO-1 and NQO-1 in HepG2 cells. Furthermore, knockdown Nrf2 by small interfering RNA (siRNA) notably enhanced the expression of PTP1B and blunt EGCG-stimulated glucose uptake. Consistent with these results, in vivo study revealed that EGCG supplement significantly ameliorated high-fat and high-fructose diet (HFFD)-triggered insulin resistance and oxidative stress by up-regulating the IRS-1/AKT and Keap1/Nrf2 transcriptional pathways. Administration of an appropriate chemopreventive agent, such as EGCG, could potentially serve as an additional therapeutic intervention in the arsenal against obesity.
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Affiliation(s)
- Yashi Mi
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Wentong Zhang
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Haoyu Tian
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Runnan Li
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Shuxian Huang
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Xingyu Li
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Guoyuan Qi
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Xuebo Liu
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
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Sangeetha KN, Sujatha S, Muthusamy VS, Anand S, Shilpa K, kumari PJ, Sarathkumar B, Thiyagarajan G, Lakshmi BS. Current trends in small molecule discovery targeting key cellular signaling events towards the combined management of diabetes and obesity. Bioinformation 2017; 13:394-399. [PMID: 29379255 PMCID: PMC5767913 DOI: 10.6026/97320630013394] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Revised: 12/19/2017] [Accepted: 12/19/2017] [Indexed: 12/19/2022] Open
Abstract
Non-insulin dependent diabetes mellitus, also known as Type 2 diabetes is a polygenic disorder leading to abnormalities in the carbohydrate and lipid metabolism. The major contributors in the pathophysiology of type 2 diabetes (T2D) include resistance to insulin action, β cell dysfunction, an abnormality in glucose metabolism and storage, visceral obesity and to some extent inflammation and oxidative stress. Insulin resistance, along with a defect in insulin secretion by the pancreatic β cells is instrumental towards progression to hyperglycemia. Increased incidence of obesity is also a major contributing factor in the escalating rates of type 2 diabetes. Drug discovery efforts are therefore crucially dependent on identifying individual molecular targets and validating their relevance to human disease. The current review discusses bioactive compounds from medicinal plants offering enhanced therapeutic potential for the combined patho-physiology of diabetes and obesity. We have demonstrated that 3β-taraxerol a pentacyclic triterpenoid (14-taraxeren-3-ol) isolated from the ethyl acetate extract of Mangifera indica, chlorogenic acid isolated from the methanol extract of Cichorium intybus, methyl tetracosanoate from the methanol extract of Costus pictus and vitalboside A derived from methanolic extract of Syzygium cumini exhibited significant effects on insulin stimulated glucose uptake causing insulin sensitizing effects on 3T3L1 adipocytes (an in vitro model mimicking adipocytes). Whereas, (3β)-stigmast-5-en-3-ol isolated from Adathoda vasica and Aloe emodin isolated from Cassia fistula showed significant insulin mimetic effects favoring glucose uptake in L6 myotubes (an in vitro model mimicking skeletal muscle cells). These extracts and molecules showed glucose uptake through activation of PI3K, an important insulin signaling intermediate. Interestingly, cinnamic acid isolated from the hydro-alcohol extract of Cinnamomum cassia was found to activate glucose transport in L6 myotubes through the involvement of GLUT4 via the PI3K-independent pathway. However, the activation of glucose storage was effective in the presence of 3β-taraxerol and aloe emodin though inhibition of GSK3β activity. Therefore, the mechanism of improvement of glucose and lipid metabolism exhibited by the small molecules isolated from our lab is discussed. However, Obesity is a major risk factor for type-2 diabetes leading to destruction of insulin receptors causing insulin resistance. Identification of compounds with dual activity (anti-diabetic and antiadipogenic activity) is of current interest. The protein tyrosine phosphatase 1B (PTP1B) is an important negative regulator of the insulin and leptin-signaling pathway is of significance in target definition and discovery.
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Affiliation(s)
| | - Sundaresan Sujatha
- Department of Biotechnology, Anna University, Chennai Tamilnadu, India - 600 025
| | | | - Singaravel Anand
- Department of Biotechnology, Anna University, Chennai Tamilnadu, India - 600 025
| | - Kusampudi Shilpa
- Department of Biotechnology, Anna University, Chennai Tamilnadu, India - 600 025
| | - Posa Jyothi kumari
- Department of Biotechnology, Anna University, Chennai Tamilnadu, India - 600 025
| | - Baskaran Sarathkumar
- Department of Biotechnology, Anna University, Chennai Tamilnadu, India - 600 025
| | - Gopal Thiyagarajan
- Department of Biotechnology, Anna University, Chennai Tamilnadu, India - 600 025
| | - Baddireddi Subhadra Lakshmi
- Department of Biotechnology, Anna University, Chennai Tamilnadu, India - 600 025
- Centre for Food Technology, Department of Biotechnology, Anna University, Chennai Tamilnadu, India - 600 025
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Computational Insight into Protein Tyrosine Phosphatase 1B Inhibition: A Case Study of the Combined Ligand- and Structure-Based Approach. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2017; 2017:4245613. [PMID: 29441120 PMCID: PMC5758944 DOI: 10.1155/2017/4245613] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Accepted: 09/26/2017] [Indexed: 11/25/2022]
Abstract
Protein tyrosine phosphatase 1B (PTP1B) is an attractive target for treating cancer, obesity, and type 2 diabetes. In our work, the way of combined ligand- and structure-based approach was applied to analyze the characteristics of PTP1B enzyme and its interaction with competitive inhibitors. Firstly, the pharmacophore model of PTP1B inhibitors was built based on the common feature of sixteen compounds. It was found that the pharmacophore model consisted of five chemical features: one aromatic ring (R) region, two hydrophobic (H) groups, and two hydrogen bond acceptors (A). To further elucidate the binding modes of these inhibitors with PTP1B active sites, four docking programs (AutoDock 4.0, AutoDock Vina 1.0, standard precision (SP) Glide 9.7, and extra precision (XP) Glide 9.7) were used. The characteristics of the active sites were then described by the conformations of the docking results. In conclusion, a combination of various pharmacophore features and the integration information of structure activity relationship (SAR) can be used to design novel potent PTP1B inhibitors.
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Casanova LM, Gu W, Costa SS, Jeppesen PB. Phenolic Substances from Ocimum Species Enhance Glucose-Stimulated Insulin Secretion and Modulate the Expression of Key Insulin Regulatory Genes in Mice Pancreatic Islets. JOURNAL OF NATURAL PRODUCTS 2017; 80:3267-3275. [PMID: 29192771 DOI: 10.1021/acs.jnatprod.7b00699] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ocimum gratissimum and Ocimum basilicum are plants ethnopharmacologically used to treat diabetes mellitus, a life-threatening disease that affects millions of people worldwide. In order to further understand their antidiabetic potential, which has been previously demonstrated in animal models, we aimed to investigate the acute and chronic effects of major phenolic substances from both plants on insulin secretion and gene expression in pancreatic islets isolated from NMRI mice. Insulin secretion was measured after acute (1 h) and long-term (72 h) incubation of islets with one of four cinnamic acid derivatives (caftaric, caffeic, chicoric, and rosmarinic acids) or a C-glucosylated flavonoid (vicenin-2). All substances acutely enhanced glucose-stimulated insulin secretion (GSIS) from islets at concentrations from 10-10 to 10-6 M. They also increased GSIS after chronic incubation (10-8 M). None of them increased insulin secretion in the presence of low glucose concentration. Furthermore, these substances markedly changed the gene expression profile of key insulin regulatory genes INS1, INS2, PDX1, INSR, IRS1, and proliferative genes as well as glucose transporter 2 (GLUT2), in treated islets. Thus, they may play an important role in diabetes treatment. This is the first report on the insulin-secretory activity of caftaric acid, rosmarinic acid, and vicenin-2.
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Affiliation(s)
- Livia Marques Casanova
- Instituto de Pesquisas de Produtos Naturais, Centro de Ciências da Saúde, Bloco H, Cidade Universitária, Universidade Federal do Rio de Janeiro , 21 941-902 Rio de Janeiro, RJ, Brazil
- Department of Clinical Medicine, Aarhus University Hospital, Aarhus University , Tage-Hansens Gade 2, 8000 Aarhus C, Denmark
| | - Wenqian Gu
- Department of Clinical Medicine, Aarhus University Hospital, Aarhus University , Tage-Hansens Gade 2, 8000 Aarhus C, Denmark
| | - Sônia Soares Costa
- Instituto de Pesquisas de Produtos Naturais, Centro de Ciências da Saúde, Bloco H, Cidade Universitária, Universidade Federal do Rio de Janeiro , 21 941-902 Rio de Janeiro, RJ, Brazil
| | - Per Bendix Jeppesen
- Department of Clinical Medicine, Aarhus University Hospital, Aarhus University , Tage-Hansens Gade 2, 8000 Aarhus C, Denmark
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25
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Jung HJ, Seong SH, Ali MY, Min BS, Jung HA, Choi JS. α-Methyl artoflavanocoumarin from Juniperus chinensis exerts anti-diabetic effects by inhibiting PTP1B and activating the PI3K/Akt signaling pathway in insulin-resistant HepG2 cells. Arch Pharm Res 2017; 40:1403-1413. [PMID: 29177868 DOI: 10.1007/s12272-017-0992-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Accepted: 11/19/2017] [Indexed: 01/04/2023]
Abstract
Diabetes mellitus is one of the greatest global health issues and much research effort continues to be directed toward identifying novel therapeutic agents. Insulin resistance is a challenging integrally related topic and molecules capable of overcoming it are of considerable therapeutic interest in the context of type 2 diabetes mellitus (T2DM). Protein tyrosine phosphatase 1B (PTP1B) negatively regulates insulin signaling transduction and is regarded a novel therapeutic target in T2DM. Here, we investigated the inhibitory effect of α-methyl artoflavanocoumarin (MAFC), a natural flavanocoumarin isolated from Juniperus chinensis, on PTP1B in insulin-resistant HepG2 cells. MAFC was found to potently inhibit PTP1B with an IC50 of 25.27 ± 0.14 µM, and a kinetics study revealed MAFC is a mixed type PTP1B inhibitor with a K i value of 13.84 µM. Molecular docking simulations demonstrated MAFC can bind to catalytic and allosteric sites of PTP1B. Furthermore, MAFC significantly increased glucose uptake and decreased the expression of PTP1B in insulin-resistant HepG2 cells, down-regulated the phosphorylation of insulin receptor substrate (IRS)-1 (Ser307), and dose-dependently enhanced the protein levels of IRS-1, phosphorylated phosphoinositide 3-kinase (PI3K), Akt, and ERK1. These results suggest that MAFC from J. chinensis has therapeutic potential in T2DM by inhibiting PTP1B and activating insulin signaling pathways.
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Affiliation(s)
- Hee Jin Jung
- Department of Food and Life Science, Pukyong National University, Busan, 48513, Republic of Korea
| | - Su Hui Seong
- Department of Food and Life Science, Pukyong National University, Busan, 48513, Republic of Korea
| | - Md Yousof Ali
- Department of Food and Life Science, Pukyong National University, Busan, 48513, Republic of Korea
| | - Byung-Sun Min
- College of Pharmacy, Catholic University of Daegu, Gyeongsan, 38430, Republic of Korea
| | - Hyun Ah Jung
- Department of Food Science and Human Nutrition, Chonbuk National University, Jeonju, 54896, Republic of Korea.
| | - Jae Sue Choi
- Department of Food and Life Science, Pukyong National University, Busan, 48513, Republic of Korea.
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26
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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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Potential of Icariin Metabolites from Epimedium koreanum Nakai as Antidiabetic Therapeutic Agents. Molecules 2017; 22:molecules22060986. [PMID: 28608833 PMCID: PMC6152727 DOI: 10.3390/molecules22060986] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 06/12/2017] [Accepted: 06/12/2017] [Indexed: 01/31/2023] Open
Abstract
The therapeutic properties of Epimedium koreanum are presumed to be due to the flavonoid component icariin, which has been reported to have broad pharmacological potential and has demonstrated anti-diabetic, anti-Alzheimer’s disease, anti-tumor, and hepatoprotective activities. Considering these therapeutic properties of icariin, its deglycosylated icaritin and glycosylated flavonoids (icaeriside II, epimedin A, epimedin B, and epimedin C) were evaluated for their ability to inhibit protein tyrosine phosphatase 1B (PTP1B) and α-glucosidase. The results show that icaritin and icariside II exhibit potent inhibitory activities, with 50% inhibition concentration (IC50) values of 11.59 ± 1.39 μM and 9.94 ± 0.15 μM against PTP1B and 74.42 ± 0.01 and 106.59 ± 0.44 μM against α-glucosidase, respectively. With the exceptions of icaritin and icariside II, glycosylated flavonoids did not exhibit any inhibitory effects in the two assays. Enzyme kinetics analyses revealed that icaritin and icariside II demonstrated noncompetitive-type inhibition against PTP1B, with inhibition constant (Ki) values of 11.41 and 11.66 μM, respectively. Moreover, molecular docking analysis confirmed that icaritin and icariside II both occupy the same site as allosteric ligand. Thus, the molecular docking simulation results were in close agreement with the experimental data with respect to inhibition activity. In conclusion, deglycosylated metabolites of icariin from E. koreanum might offer therapeutic potential for the treatment of type 2 diabetes mellitus.
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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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29
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Zhu D, Zhang N, Zhou X, Zhang M, Liu Z, Liu X. Cichoric acid regulates the hepatic glucose homeostasis via AMPK pathway and activates the antioxidant response in high glucose-induced hepatocyte injury. RSC Adv 2017. [DOI: 10.1039/c6ra25901d] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
CA regulates hepatic glucose homeostasisviathe AMPK pathway and improves hepatocyte injuryviaantioxidant responsein vitroandin vivo.
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Affiliation(s)
- Di Zhu
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling 712100
- China
| | - Ni Zhang
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling 712100
- China
| | - Xuelian Zhou
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling 712100
- China
| | - Mengying Zhang
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling 712100
- China
| | - Zhigang Liu
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling 712100
- China
| | - Xuebo Liu
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling 712100
- China
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Qian M, Shan Y, Guan S, Zhang H, Wang S, Han W. Structural Basis of Fullerene Derivatives as Novel Potent Inhibitors of Protein Tyrosine Phosphatase 1B: Insight into the Inhibitory Mechanism through Molecular Modeling Studies. J Chem Inf Model 2016; 56:2024-2034. [PMID: 27649447 DOI: 10.1021/acs.jcim.6b00482] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Protein tyrosine phosphatase 1B (PTP1B) has become an outstanding target for the treatment of diabetes and obesity. Recent research has demonstrated that some fullerene derivatives serve as a new nanoscale-class of potent inhibitors of PTP1B, but the specific mechanism remains unclear. Several molecular modeling methods (molecular docking, molecular dynamics simulations, and molecular mechanics/generalized Born surface area calculations) were integrated to provide insight into the binding mode and inhibitory mechanism of the new class of fullerene inhibitors. The results reveal that PTP1B with an open WPD loop is more susceptible to the combination with the fullerene inhibitor because of their comparable shapes and sizes. When the WPD loop fluctuates to the open conformation, the inhibitor falls into the active pocket and induces conformational rotation of the WPD loop. This rotation is closely related to the reduction of the catalytic activity of PTP1B. In addition, it is suggested that compound 1, like compound 2, is a competitive inhibitor since it blocks the active site to prevent the binding of the substrate. The high binding affinity of fullerene-based compounds and the transition of the WPD loop, caused by the specific structural property of the hydrophobic fullerene core and the appended polar groups, make these fullerene derivatives efficient competitive inhibitors. The theoretical results provide useful clues for further investigation of the noval inhibitors of PTP1B at the nanoscale.
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Affiliation(s)
- Mengdan Qian
- Institute of Theoretical Chemistry, Jilin University , Changchun 130023, China
| | - Yaming Shan
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University , Changchun 130012, China
| | - Shanshan Guan
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University , Changchun 130012, China
| | - Hao Zhang
- Institute of Theoretical Chemistry, Jilin University , Changchun 130023, China
| | - Song Wang
- Institute of Theoretical Chemistry, Jilin University , Changchun 130023, China
| | - Weiwei Han
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University , Changchun 130012, China.,Department of Computer Science, C. S. Bond Life Sciences Center, University of Missouri , Columbia, Missouri 65211, United States
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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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Thiyagarajan G, Muthukumaran P, Sarath Kumar B, Muthusamy VS, Lakshmi BS. Selective Inhibition of PTP1B by Vitalboside A from Syzygium cumini Enhances Insulin Sensitivity and Attenuates Lipid Accumulation Via Partial Agonism to PPARγ: In Vitro and In Silico Investigation. Chem Biol Drug Des 2016; 88:302-12. [PMID: 26989847 DOI: 10.1111/cbdd.12757] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Revised: 02/24/2016] [Accepted: 03/01/2016] [Indexed: 12/23/2022]
Abstract
Although antidiabetic drugs show good insulin-sensitizing property for T2DM, they also exhibit undesirable side-effects. Partial peroxisome proliferator-activated receptor γ agonism with protein tyrosine phosphatase 1B inhibition is considered as an alternative therapeutic approach toward the development of a safe insulin sensitizer. Bioactivity-based fractionation and purification of Syzygium cumini seeds led to the isolation and identification of bifunctional Vitalboside A, which showed antidiabetic and anti-adipogenic activities, as measured by glucose uptake in L6 and 3T3-L1 adipocytes and Nile red assay. A non-competitive allosteric inhibition of protein tyrosine phosphatase 1B by Vitalboside A was observed, which was confirmed by docking studies. Inhibitor studies with wortmannin and genistein showed an IRTK- and PI3K-dependent glucose uptake. A PI3K/AKT-dependent activation of GLUT4 translocation and an inactivation of GSK3β were observed, confirming its insulin-sensitizing potential. Vitalboside A exhibited partial transactivation of peroxisome proliferator-activated receptor γ with an increase in adiponectin secretion, which was confirmed using docking analysis. Vitalboside A is a bifunctional molecule derived from edible plant showing inhibition of PTP1B and partial agonism to peroxisome proliferator-activated receptor γ which could be a promising therapeutic agent in the management of obesity and diabetes.
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Affiliation(s)
- Gopal Thiyagarajan
- Tissue culture and Drug Discovery Laboratory, Centre for Food Technology, Department of Biotechnology, Anna University, Sardar Patel Road, Guindy, Chennai-600 025, India
| | - Padmanaban Muthukumaran
- Tissue culture and Drug Discovery Laboratory, Centre for Food Technology, Department of Biotechnology, Anna University, Sardar Patel Road, Guindy, Chennai-600 025, India
| | - Baskaran Sarath Kumar
- Tissue culture and Drug Discovery Laboratory, Centre for Food Technology, Department of Biotechnology, Anna University, Sardar Patel Road, Guindy, Chennai-600 025, India
| | - Velusamy Shanmuganathan Muthusamy
- Tissue culture and Drug Discovery Laboratory, Centre for Food Technology, Department of Biotechnology, Anna University, Sardar Patel Road, Guindy, Chennai-600 025, India
| | - Baddireddi Subhadra Lakshmi
- Tissue culture and Drug Discovery Laboratory, Centre for Food Technology, Department of Biotechnology, Anna University, Sardar Patel Road, Guindy, Chennai-600 025, India
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Ling B, Liu Y, Li X, Wang Z, Bi S. Identification of the active site of human mitochondrial malonyl-coenzyme a decarboxylase: A combined computational study. Proteins 2016; 84:792-802. [PMID: 26948533 DOI: 10.1002/prot.25029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 02/05/2016] [Accepted: 02/19/2016] [Indexed: 11/06/2022]
Abstract
Malonyl-CoA decarboxylase (MCD) can control the level of malonyl-CoA in cell through the decarboxylation of malonyl-CoA to acetyl-CoA, and plays an essential role in regulating fatty acid metabolism, thus it is a potential target for drug discovery. However, the interactions of MCD with CoA derivatives are not well understood owing to unavailable crystal structure with a complete occupancy in the active site. To identify the active site of MCD, molecular docking and molecular dynamics simulations were performed to explore the interactions of human mitochondrial MCD (HmMCD) and CoA derivatives. The findings reveal that the active site of HmMCD indeed resides in the prominent groove which resembles that of CurA. However, the binding modes are slightly different from the one observed in CurA due to the occupancy of the side chain of Lys183 from the N-terminal helical domain instead of the adenine ring of CoA. The residues 300 - 305 play an essential role in maintaining the stability of complex mainly through hydrogen bond interactions with the pyrophosphate moiety of acetyl-CoA. Principle component analysis elucidates the conformational distribution and dominant concerted motions of HmMCD. MM_PBSA calculations present the crucial residues and the major driving force responsible for the binding of acetyl-CoA. These results provide useful information for understanding the interactions of HmMCD with CoA derivatives. Proteins 2016; 84:792-802. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Baoping Ling
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong Province, 273165, China
| | - Yuxia Liu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong Province, 273165, China
| | - Xiaoping Li
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong Province, 273165, China
| | - Zhiguo Wang
- Institute of Aging Research, School of Medicine, Hangzhou Normal University, Hangzhou, Zhejiang Province, 311121, China
| | - Siwei Bi
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong Province, 273165, China
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Jin T, Yu H, Huang XF. Selective binding modes and allosteric inhibitory effects of lupane triterpenes on protein tyrosine phosphatase 1B. Sci Rep 2016; 6:20766. [PMID: 26865097 PMCID: PMC4749975 DOI: 10.1038/srep20766] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 01/04/2016] [Indexed: 12/31/2022] Open
Abstract
Protein Tyrosine Phosphatase 1B (PTP1B) has been recognized as a promising therapeutic target for treating obesity, diabetes, and certain cancers for over a decade. Previous drug design has focused on inhibitors targeting the active site of PTP1B. However, this has not been successful because the active site is positively charged and conserved among the protein tyrosine phosphatases. Therefore, it is important to develop PTP1B inhibitors with alternative inhibitory strategies. Using computational studies including molecular docking, molecular dynamics simulations, and binding free energy calculations, we found that lupane triterpenes selectively inhibited PTP1B by targeting its more hydrophobic and less conserved allosteric site. These findings were verified using two enzymatic assays. Furthermore, the cell culture studies showed that lupeol and betulinic acid inhibited the PTP1B activity stimulated by TNFα in neurons. Our study indicates that lupane triterpenes are selective PTP1B allosteric inhibitors with significant potential for treating those diseases with elevated PTP1B activity.
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Affiliation(s)
- Tiantian Jin
- Centre for Translational Neuroscience, School of Medicine, University of Wollongong, and Illawarra Health and Medical Research Institute (IHMRI), Wollongong, NSW 2522, Australia
| | - Haibo Yu
- School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Xu-Feng Huang
- Centre for Translational Neuroscience, School of Medicine, University of Wollongong, and Illawarra Health and Medical Research Institute (IHMRI), Wollongong, NSW 2522, Australia
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Kuban-Jankowska A, Sahu KK, Gorska M, Tuszynski JA, Wozniak M. Chicoric acid binds to two sites and decreases the activity of the YopH bacterial virulence factor. Oncotarget 2016; 7:2229-38. [PMID: 26735581 PMCID: PMC4823031 DOI: 10.18632/oncotarget.6812] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 11/26/2015] [Indexed: 11/25/2022] Open
Abstract
Chicoric acid (CA) is a phenolic compound present in dietary supplements with a large spectrum of biological properties reported ranging from antioxidant, to antiviral, to immunostimulatory properties. Due to the fact that chicoric acid promotes phagocytic activity and was reported as an allosteric inhibitor of the PTP1B phosphatase, we examined the effect of CA on YopH phosphatase from pathogenic bacteria, which block phagocytic processes of a host cell. We performed computational studies of chicoric acid binding to YopH as well as validation experiments with recombinant enzymes. In addition, we performed similar studies for caffeic and chlorogenic acids to compare the results. Docking experiments demonstrated that, from the tested compounds, only CA binds to both catalytic and secondary binding sites of YopH. Our experimental results showed that CA reduces activity of recombinant YopH phosphatase from Yersinia enterocolitica and human CD45 phosphatase. The inhibition caused by CA was irreversible and did not induce oxidation of catalytic cysteine. We proposed that inactivation of YopH induced by CA is involved with allosteric inhibition by interacting with essential regions responsible for ligand binding.
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Affiliation(s)
| | - Kamlesh K. Sahu
- Department of Physics, University of Alberta, Edmonton, Canada
| | - Magdalena Gorska
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland
| | - Jack A. Tuszynski
- Department of Physics, University of Alberta, Edmonton, Canada
- Division of Experimental Oncology, Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Canada
| | - Michal Wozniak
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland
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36
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Ling B, Yan X, Sun M, Bi S. Theoretical investigations on the interactions of glucokinase regulatory protein with fructose phosphates. Comput Biol Chem 2015; 60:21-31. [PMID: 26629747 DOI: 10.1016/j.compbiolchem.2015.07.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 07/16/2015] [Accepted: 07/25/2015] [Indexed: 10/23/2022]
Abstract
Glucokinase (GK) plays a critical role in maintaining glucose homeostasis in the human liver and pancreas. In the liver, the activity of GK is modulated by the glucokinase regulatory protein (GKRP) which functions as a competitive inhibitor of glucose to bind to GK. Moreover, the inhibitory intensity of GKRP-GK is suppressed by fructose 1-phosphate (F1P), and reinforced by fructose 6-phosphate (F6P). Here, we employed a series of computational techniques to explore the interactions of fructose phosphates with GKRP. Calculation results reveal that F1P and F6P can bind to the same active site of GKRP with different binding modes, and electrostatic interaction provides a major driving force for the ligand binding. The presence of fructose phosphate severely influences the motions of protein and the conformational space, and the structural change of sugar phosphate influences its interactions with GKRP, leading to a large conformational rearrangement of loop2 in the SIS2 domain. In particular, the binding of F6P to GKRP facilitates the protruding loop2 contacting with GK to form the stable GK-GKRP complex. The conserved residues 179-184 of GKRP play a major role in the binding of phosphate group and maintaining the stability of GKRP. These results may provide deep insight into the regulatory mechanism of GKRP to the activity of GK.
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Affiliation(s)
- Baoping Ling
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong Province 273165, China.
| | - Xueyuan Yan
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong Province 273165, China
| | - Min Sun
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong Province 273165, China
| | - Siwei Bi
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong Province 273165, China.
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37
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Feng Z, Hu G, Ma S, Xie XQ. Computational Advances for the Development of Allosteric Modulators and Bitopic Ligands in G Protein-Coupled Receptors. AAPS JOURNAL 2015; 17:1080-95. [PMID: 25940084 DOI: 10.1208/s12248-015-9776-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 04/21/2015] [Indexed: 12/14/2022]
Abstract
Allosteric modulators of G protein-coupled receptors (GPCRs), which target at allosteric sites, have significant advantages against the corresponding orthosteric compounds including higher selectivity, improved chemical tractability or physicochemical properties, and reduced risk of receptor oversensitization. Bitopic ligands of GPCRs target both orthosteric and allosteric sites. Bitopic ligands can improve binding affinity, enhance subtype selectivity, stabilize receptors, and reduce side effects. Discovering allosteric modulators or bitopic ligands for GPCRs has become an emerging research area, in which the design of allosteric modulators is a key step in the detection of bitopic ligands. Radioligand binding and functional assays ([(35)S]GTPγS and ERK1/2 phosphorylation) are used to test the effects for potential modulators or bitopic ligands. High-throughput screening (HTS) in combination with disulfide trapping and fragment-based screening are used to aid the discovery of the allosteric modulators or bitopic ligands of GPCRs. When used alone, these methods are costly and can often result in too many potential drug targets, including false positives. Alternatively, low-cost and efficient computational approaches are useful in drug discovery of novel allosteric modulators and bitopic ligands to help refine the number of targets and reduce the false-positive rates. This review summarizes the state-of-the-art computational methods for the discovery of modulators and bitopic ligands. The challenges and opportunities for future drug discovery are also discussed.
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Affiliation(s)
- Zhiwei Feng
- Department of Pharmaceutical Sciences and Computational Chemical Genomics Screening Center, School of Pharmacy, 3501 Terrace Street, 529 Salk Hall, Pittsburgh, Pennsylvania, 15261, USA
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Li S, Zhang J, Lu S, Huang W, Geng L, Shen Q, Zhang J. The mechanism of allosteric inhibition of protein tyrosine phosphatase 1B. PLoS One 2014; 9:e97668. [PMID: 24831294 PMCID: PMC4022711 DOI: 10.1371/journal.pone.0097668] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Accepted: 04/09/2014] [Indexed: 11/24/2022] Open
Abstract
As the prototypical member of the PTP family, protein tyrosine phosphatase 1B (PTP1B) is an attractive target for therapeutic interventions in type 2 diabetes. The extremely conserved catalytic site of PTP1B renders the design of selective PTP1B inhibitors intractable. Although discovered allosteric inhibitors containing a benzofuran sulfonamide scaffold offer fascinating opportunities to overcome selectivity issues, the allosteric inhibitory mechanism of PTP1B has remained elusive. Here, molecular dynamics (MD) simulations, coupled with a dynamic weighted community analysis, were performed to unveil the potential allosteric signal propagation pathway from the allosteric site to the catalytic site in PTP1B. This result revealed that the allosteric inhibitor compound-3 induces a conformational rearrangement in helix α7, disrupting the triangular interaction among helix α7, helix α3, and loop11. Helix α7 then produces a force, pulling helix α3 outward, and promotes Ser190 to interact with Tyr176. As a result, the deviation of Tyr176 abrogates the hydrophobic interactions with Trp179 and leads to the downward movement of the WPD loop, which forms an H-bond between Asp181 and Glu115. The formation of this H-bond constrains the WPD loop to its open conformation and thus inactivates PTP1B. The discovery of this allosteric mechanism provides an overall view of the regulation of PTP1B, which is an important insight for the design of potent allosteric PTP1B inhibitors.
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Affiliation(s)
- Shuai Li
- Department of Pathophysiology, Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai JiaoTong University, School of Medicine (SJTU-SM), Shanghai, China
| | - Jingmiao Zhang
- Department of Pathophysiology, Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai JiaoTong University, School of Medicine (SJTU-SM), Shanghai, China
| | - Shaoyong Lu
- Department of Pathophysiology, Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai JiaoTong University, School of Medicine (SJTU-SM), Shanghai, China
| | - Wenkang Huang
- Department of Pathophysiology, Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai JiaoTong University, School of Medicine (SJTU-SM), Shanghai, China
| | - Lv Geng
- Department of Pathophysiology, Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai JiaoTong University, School of Medicine (SJTU-SM), Shanghai, China
| | - Qiancheng Shen
- Department of Pathophysiology, Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai JiaoTong University, School of Medicine (SJTU-SM), Shanghai, China
| | - Jian Zhang
- Department of Pathophysiology, Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai JiaoTong University, School of Medicine (SJTU-SM), Shanghai, China
- Medicinal Bioinformatics Center, Shanghai JiaoTong University, School of Medicine, Shanghai, China
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Wu M, He J, Ren X, Cai WS, Fang YC, Feng XZ. Development of functional biointerfaces by surface modification of polydimethylsiloxane with bioactive chlorogenic acid. Colloids Surf B Biointerfaces 2014; 116:700-6. [DOI: 10.1016/j.colsurfb.2013.11.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 11/04/2013] [Accepted: 11/06/2013] [Indexed: 11/28/2022]
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Identification of chicoric acid as a hypoglycemic agent from Ocimum gratissimum leaf extract in a biomonitoring in vivo study. Fitoterapia 2014; 93:132-41. [PMID: 24418658 DOI: 10.1016/j.fitote.2013.12.024] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 12/29/2013] [Accepted: 12/31/2013] [Indexed: 11/20/2022]
Abstract
Ocimum gratissimum L. is popularly used to treat diabetes mellitus. The hypoglycemic activity of this medicinal species has been confirmed by in vivo studies. The present study conducted a chemical investigation of a leaf decoction (10% p/v) of O. gratissimum monitored by in vivo hypoglycemic activity assays. Four phenolic substances were identified: L-caftaric acid (1), L-chicoric acid (2), eugenyl-β-D-glucopyranoside (3) and vicenin-2 (4). The acute hypoglycemic activity of the O. gratissimum decoction fractions Og1-S (300 mg/kg), Og1-A (240 mg/kg) and Og1-B (80 mg/kg) was evaluated intraperitoneally in normal and streptozotocin-induced diabetic mice. They reduced glycemia by 63%, 76% and 60% (in 120 min), respectively, in the diabetic mice. Subfractions of Og1-A were also evaluated under the same conditions: Og1-AS (200 mg/kg) and Og1-AP (40 mg/kg) produced a decrease of only 37% and 39%, respectively. Among the major phenolic substances, only chicoric acid (2; 3 mg/kg) reduced significantly the glycemic levels of diabetic mice by 53%, 120 min after treatment. This is the first study describing the hypoglycemic activity of chicoric acid in an animal model of diabetes mellitus. In addition, we suggest that there may be other substances contributing to this activity. Thus, for the first time, a correlation is established between the hypoglycemic activity of O. gratissimum and its chemical composition.
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Shinde RN, Sobhia ME. Binding and discerning interactions of PTP1B allosteric inhibitors: Novel insights from molecular dynamics simulations. J Mol Graph Model 2013; 45:98-110. [DOI: 10.1016/j.jmgm.2013.08.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Revised: 06/30/2013] [Accepted: 08/06/2013] [Indexed: 10/26/2022]
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