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Brustolin L, Pettenuzzo N, Nardon C, Quarta S, Marchiò L, Biondi B, Pontisso P, Fregona D. Au(iii)-Proline derivatives exhibiting selective antiproliferative activity against HepG2/SB3 apoptosis-resistant cancer cells. Dalton Trans 2019; 48:16017-16025. [PMID: 31599279 DOI: 10.1039/c9dt03036k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper deals with the combination of a proline-based moiety with biologically active gold centers in the oxidation states +1 and +3. In particular, six Au(i)/(iii)-proline dithiocarbamato (DTC) complexes with general formulae [Au(DTC)2] and [AuIIIX2(DTC)] (X = Cl, Br) are reported here. After the synthesis of the ligand and the complexes, all derivatives were characterized via several techniques and tested for their stability in DMSO/water media. This study was focused on the demonstration of a peculiar behavior of Au(iii)-DTC species in solution. Finally, the complexes were screened for their antiproliferative activity against 2 human cancer cell lines, namely HepG2 and HepG2/SB3, taken as models of hepatocellular carcinoma. The latter, chosen for its aggressiveness due to the upregulation of the anti-apoptotic protein SerpinB3, was selectively inhibited in terms of growth by some Au(iii)-DTC complexes.
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Affiliation(s)
- L Brustolin
- Department of Chemical Sciences, University of Padova, Via F. Marzolo 1, 35131 Padova, Italy. and Department of Surgical, Oncologic and Gastroenterological Sciences, University of Padova, Via Giustiniani 2, 35128, Padova, Italy
| | - N Pettenuzzo
- Department of Chemical Sciences, University of Padova, Via F. Marzolo 1, 35131 Padova, Italy. and Department of Surgical, Oncologic and Gastroenterological Sciences, University of Padova, Via Giustiniani 2, 35128, Padova, Italy
| | - C Nardon
- Department of Chemical Sciences, University of Padova, Via F. Marzolo 1, 35131 Padova, Italy.
| | - S Quarta
- Department of Medicine, University of Padova, Via Giustiniani 2, 35128, Padova, Italy
| | - L Marchiò
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze, 17/A - 43124, Parma, Italy
| | - B Biondi
- CNR, Padova Unit, Inst Biomol Chem, Via Marzolo 1, I-35131 Padua, Italy
| | - P Pontisso
- Department of Medicine, University of Padova, Via Giustiniani 2, 35128, Padova, Italy
| | - D Fregona
- Department of Chemical Sciences, University of Padova, Via F. Marzolo 1, 35131 Padova, Italy.
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Wang A, Wu S, Tao Z, Li X, Lv K, Ma C, Li Y, Li L, Liu M. Design, Synthesis, and Anti-HBV Activity of New Bis(l-amino acid) Ester Tenofovir Prodrugs. ACS Med Chem Lett 2019; 10:991-995. [PMID: 31223460 DOI: 10.1021/acsmedchemlett.9b00184] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 05/16/2019] [Indexed: 12/19/2022] Open
Abstract
A series of bis(l-amino acid) ester prodrugs of tenofovir (TFV) were designed and synthesized as new anti-HBV agents in this work. Four compounds 11, 12a, 12d, and 13b displayed better anti-HBV activity (IC50: 0.71-4.22 μM) than the parent drug TFV. The most active compound 11 (IC50: 0.71 μM), a bis(l-valine) ester prodrug of TFV, was found to have obviously greater AUC0-∞, C max, and F% than tenofovir disoproxil fumarate (TDF), and potent in vivo efficacy which is not inferior to TDF in a duck HBV (DHBV) model and a HBV DNA hydrodynamic mouse model, and it may serve as a promising lead compound for further anti-HBV drug discovery.
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Affiliation(s)
- Apeng Wang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Shuo Wu
- CAMS Key Laboratory of Antiviral Drug Research, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Zeyu Tao
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Xiaoning Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Kai Lv
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Chao Ma
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Yuhuan Li
- CAMS Key Laboratory of Antiviral Drug Research, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Linhu Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Mingliang Liu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
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3
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Pharmaceutical challenges and perspectives in developing ophthalmic drug formulations. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2018. [DOI: 10.1007/s40005-018-0404-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Intestinal barrier dysfunction: implications for chronic inflammatory conditions of the bowel. Nutr Res Rev 2016; 29:40-59. [DOI: 10.1017/s0954422416000019] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
AbstractThe intestinal epithelium of adult humans acts as a differentially permeable barrier that separates the potentially harmful contents of the lumen from the underlying tissues. Any dysfunction of this boundary layer that disturbs the homeostatic equilibrium between the internal and external environments may initiate and sustain a biochemical cascade that results in inflammation of the intestine. Key to such dysfunction are genetic, microbial and other environmental factors that, singularly or in combination, result in chronic inflammation that is symptomatic of inflammatory bowel disease (IBD). The aim of the present review is to assess the scientific evidence to support the hypothesis that defective transepithelial transport mechanisms and the heightened absorption of intact antigenic proinflammatory oligopeptides are important contributing factors in the pathogenesis of IBD.
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Liu JA, Guo XP, Liang S, An F, Shen HY, Xu YJ. Regioselective synthesis of 5′-amino acid esters of some nucleosides via orthogonal protecting protocol. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.01.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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6
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Zhang Y, Sun J, Gao Y, Jin L, Xu Y, Lian H, Sun Y, Sun Y, Liu J, Fan R, Zhang T, He Z. A Carrier-Mediated Prodrug Approach To Improve the Oral Absorption of Antileukemic Drug Decitabine. Mol Pharm 2013; 10:3195-202. [DOI: 10.1021/mp400233x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Youxi Zhang
- Department of Biopharmaceutics, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
| | - Jin Sun
- Department of Biopharmaceutics, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
| | - Yikun Gao
- Department of Biopharmaceutics, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
| | - Ling Jin
- Department of Biopharmaceutics, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
| | - Youjun Xu
- Department of Medicinal Chemistry, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
| | - He Lian
- Department of Biopharmaceutics, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
| | - Yongbing Sun
- National Pharmaceutical Engineering
Center for Solid Preparation in Chinese Herbal Medicine, Jiangxi University of Traditional Chinese Medicine,
No. 56, Yangming Road, Nanchang, 330006, China
| | - Yinghua Sun
- Department of Biopharmaceutics, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
| | - Jianyu Liu
- Department of Medicinal Chemistry, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
| | - Rui Fan
- Department of Biopharmaceutics, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
| | - Tianhong Zhang
- Department of Biopharmaceutics, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
| | - Zhonggui He
- Department of Biopharmaceutics, Shenyang Pharmaceutical University, No. 103, Wenhua
Road, Shenyang, 110016, China
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7
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Haller S, Schuler F, Lazic SE, Bachir-Cherif D, Krämer SD, Parrott NJ, Steiner G, Belli S. Expression Profiles of Metabolic Enzymes and Drug Transporters in the Liver and along the Intestine of Beagle Dogs. Drug Metab Dispos 2012; 40:1603-10. [DOI: 10.1124/dmd.112.045443] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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Omkvist DH, Brodin B, Nielsen CU. Ibuprofen is a non-competitive inhibitor of the peptide transporter hPEPT1 (SLC15A1): possible interactions between hPEPT1 substrates and ibuprofen. Br J Pharmacol 2011; 161:1793-805. [PMID: 20726987 DOI: 10.1111/j.1476-5381.2010.01000.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND AND PURPOSE Recently, we identified etodolac as a possible ligand for the human intestinal proton-couple peptide transporter (hPEPT1). This raised the possibility that other non-steroidal anti-inflammatory drugs, and especially ibuprofen, could also interact with hPEPT1. Here, we have assessed the interactions of ibuprofen with hPEPT1. EXPERIMENTAL APPROACH The uptake of [(14)C]Gly-Sar, [(3)H]Ibuprofen and other radio-labelled compounds were investigated in Madin-Darby canine kidney cells (MDCK)/hPEPT1, MDCK/Mock, LLC-PK(1) or Caco-2 cells. The transepithelial transport of ibuprofen and hPEPT1 substrates was investigated in Caco-2 cell monolayers. KEY RESULTS Ibuprofen concentration dependently inhibited hPEPT1-mediated uptake of Gly-Sar in MDCK/hPEPT1 cells (K(i)(app) = 0.4 mM) but uptake of ibuprofen in Caco-2 cells and MDCK/hPEPT1 cells was not inhibited by hPEPT1 substrates. The maximum uptake rate for Gly-Sar uptake was reduced from 522 pmol·min(-1)·cm(-2) to 181 pmol·min(-1)·cm(-2) and 78 pmol·min(-1)·cm(-2) in the presence of 0.5 mM and 1 mM ibuprofen, respectively. The interaction between ibuprofen and hPEPT1 was thus non-competitive. In LLC-PK1 cells, ibuprofen (1 mM) did not influence the transporter-mediated uptake of glycine or α-methyl-D-glycopyranoside. In Caco-2 cell monolayers the absorptive transport of δ-aminolevulinic acid was reduced by 23% and 48% by ibuprofen (1 and 10 mM), respectively. Likewise the transport of Gly-Sar was reduced by 23% in the presence of ibuprofen (1 mM). CONCLUSIONS AND IMPLICATIONS Ibuprofen is a non-competitive inhibitor of hPEPT1. As ibuprofen reduced the transepithelial transport of δ-aminolevulinic acid, drug-drug interactions between ibuprofen and hPEPT1 drug substrates at their site of absorption are possible if administered together.
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Affiliation(s)
- Diana Højmark Omkvist
- Department of Pharmaceutics and Analytical Chemistry, The Faculty of Pharmaceutical Sciences, University of Copenhagen, Copenhagen, Denmark
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Yan Z, Sun J, Chang Y, Liu Y, Fu Q, Xu Y, Sun Y, Pu X, Zhang Y, Jing Y, Yin S, Zhu M, Wang Y, He Z. Bifunctional Peptidomimetic Prodrugs of Didanosine for Improved Intestinal Permeability and Enhanced Acidic Stability: Synthesis, Transepithelial Transport, Chemical Stability and Pharmacokinetics. Mol Pharm 2011; 8:319-29. [DOI: 10.1021/mp100376q] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhongtian Yan
- Beijing Winsunny Pharmaceutical Co., LTD, Beijing, 101113, China
| | | | | | | | | | | | | | | | | | - Yongkui Jing
- Division of Hematology/Oncology, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6547, United States
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10
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Affinity and translocation relationships via hPEPT1 of H-Xaa-Ser-OH dipeptides: Evaluation of H-Phe-Ser-OH as a pro-moiety for ibuprofen and benzoic acid prodrugs. Eur J Pharm Biopharm 2011; 77:327-31. [DOI: 10.1016/j.ejpb.2010.12.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2010] [Revised: 12/07/2010] [Accepted: 12/07/2010] [Indexed: 11/22/2022]
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11
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Omkvist DH, Larsen SB, Nielsen CU, Steffansen B, Olsen L, Jørgensen FS, Brodin B. A quantitative structure-activity relationship for translocation of tripeptides via the human proton-coupled peptide transporter, hPEPT1 (SLC15A1). AAPS JOURNAL 2010; 12:385-96. [PMID: 20449699 DOI: 10.1208/s12248-010-9195-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Accepted: 04/09/2010] [Indexed: 11/30/2022]
Abstract
The human intestinal proton-coupled peptide transporter, hPEPT1 (SLC15A1), has been identified as an absorptive transporter for both drug substances and prodrugs. An understanding of the prerequisites for transport has so far been obtained from models based on competition experiments. These models have limited value for predicting substrate translocation via hPEPT1. The aim of the present study was to investigate the requirements for translocation via hPEPT1. A set of 55 tripeptides was selected from a principal component analysis based on VolSurf descriptors using a statistical design. The majority of theses tripeptides have not previously been investigated. Translocation of the tripeptides via hPEPT1 was determined in a MDCK/hPEPT1 cell-based translocation assay measuring substrate-induced changes in fluorescence of a membrane potential-sensitive probe. Affinities for hPEPT1 of relevant tripeptides were determined by competition studies with [14C]Gly-Sar in MDCK/hPEPT1 cells. Forty tripeptides were found to be substrates for hPEPT1, having K(m)(app) values in the range 0.4-28 mM. Eight tripeptides were not able to cause a substrate-induced change in fluorescence in the translocation assay and seven tripeptides interacted with the probe itself. The conformationally restricted tripeptide Met-Pro-Pro was identified as a novel high-affinity inhibitor of hPEPT1. We also discovered the first tripeptide (Asp-Ile-Arg) that was neither a substrate nor an inhibitor of hPEPT1. To rationalise the requirements for transport, a quantitative structure-activity relationship model correlating K(m)(app) values with VolSurf descriptors was constructed. This is, to our knowledge, the first predictive model for the translocation of tripeptides via hPEPT1.
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Affiliation(s)
- Diana Højmark Omkvist
- Drug Transporters in ADME, Department of Pharmaceutics and Analytical Chemistry, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
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12
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Brandsch M, Knütter I, Bosse-Doenecke E. Pharmaceutical and pharmacological importance of peptide transporters. J Pharm Pharmacol 2010; 60:543-85. [DOI: 10.1211/jpp.60.5.0002] [Citation(s) in RCA: 179] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
AbstractPeptide transport is currently a prominent topic in membrane research. The transport proteins involved are under intense investigation because of their physiological importance in protein absorption and also because peptide transporters are possible vehicles for drug delivery. Moreover, in many tissues peptide carriers transduce peptidic signals across membranes that are relevant in information processing. The focus of this review is on the pharmaceutical relevance of the human peptide transporters PEPT1 and PEPT2. In addition to their physiological substrates, both carriers transport many β-lactam antibiotics, valaciclovir and other drugs and prodrugs because of their sterical resemblance to di- and tripeptides. The primary structure, tissue distribution and substrate specificity of PEPT1 and PEPT2 have been well characterized. However, there is a dearth of knowledge on the substrate binding sites and the three-dimensional structure of these proteins. Until this pivotal information becomes available by X-ray crystallography, the development of new drug substrates relies on classical transport studies combined with molecular modelling. In more than thirty years of research, data on the interaction of well over 700 di- and tripeptides, amino acid and peptide derivatives, drugs and prodrugs with peptide transporters have been gathered. The aim of this review is to put the reports on peptide transporter-mediated drug uptake into perspective. We also review the current knowledge on pharmacogenomics and clinical relevance of human peptide transporters. Finally, the reader's attention is drawn to other known or proposed human peptide-transporting proteins.
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Affiliation(s)
- Matthias Brandsch
- Membrane Transport Group, Biozentrum of the Martin-Luther-University Halle-Wittenberg, D-06120 Halle, Germany
| | - Ilka Knütter
- Membrane Transport Group, Biozentrum of the Martin-Luther-University Halle-Wittenberg, D-06120 Halle, Germany
| | - Eva Bosse-Doenecke
- Institute of Biochemistry/Biotechnology, Faculty of Science I, Martin-Luther-University Halle-Wittenberg, D-06120 Halle, Germany
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Frølund S, Marquez OC, Larsen M, Brodin B, Nielsen CU. Delta-aminolevulinic acid is a substrate for the amino acid transporter SLC36A1 (hPAT1). Br J Pharmacol 2010; 159:1339-53. [PMID: 20128809 DOI: 10.1111/j.1476-5381.2009.00620.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND AND PURPOSE delta-Aminolevulinic acid (ALA) is used in cancer patients for photodynamic diagnosis or therapy. Oral administration of ALA has been used in patients with prostate and bladder cancer. The present aim was to investigate the mechanism of intestinal absorption of ALA and its transport via the amino acid transporter SLC36A1. EXPERIMENTAL APPROACH In vitro investigations of ALA affinity for and uptake via SLC36A1 and SLC15A1 were performed in Caco-2 cell monolayers. Interaction of ALA with SLC15A1 was investigated in MDCK/SLC15A1 cells, whereas interactions with SLC36A1 were investigated in COS-7 cells transiently expressing SLC36A1. KEY RESULTS ALA inhibited SLC36A1-mediated L-[(3)H]Pro and SLC15A1-mediated [(14)C]Gly-Sar uptake in Caco-2 cell monolayers with IC(50) values of 11.3 and 2.1 mM respectively. In SLC36A1-expressing COS-7 cells, the uptake of [(14)C]ALA was saturable with a K(m) value of 6.8 +/- 3.0 mM and a V(max) of 96 +/- 13 pmol x cm(-2) x min(-1). Uptake of [(14)C]ALA was pH and concentration dependent, and could be inhibited by glycine, proline and GABA. In a membrane potential assay, translocation of ALA via SLC36A1 was concentration dependent, with a K(m) value of 3.8 +/- 1.0 mM. ALA is thus a substrate for SLC36A1. In Caco-2 cells, apical [(14)C]ALA uptake was pH dependent, but Na(+) independent, and completely inhibited by 5-hydroxy-L-tryptophan and L-4,4'-biphenylalanyl-l-proline. CONCLUSIONS AND IMPLICATIONS. ALA was a substrate for SLC36A1, and the apical absorption in Caco-2 cell was only mediated by SLC36A1 and SLC15A1. This advances our understanding of intestinal absorption mechanisms of ALA, as well as its potential for drug interactions.
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Affiliation(s)
- S Frølund
- Department of Pharmaceutics and Analytical Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
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Foster DR, Gonzales JP, Amidon GL, Welage LS. Intestinal Dipeptide Absorption Is Preserved During Thermal Injury and Cytokine Treatment. JPEN J Parenter Enteral Nutr 2009; 33:520-8. [DOI: 10.1177/0148607109333002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- David R. Foster
- From the Department of Pharmacy Practice, Purdue University School of Pharmacy and Pharmaceutical Sciences, Indianapolis, Indiana; Department of Pharmacy Practice and Science, University of Maryland School of Pharmacy, Baltimore, Maryland; Department of Pharmaceutical Sciences, University of Michigan, College of Pharmacy, Ann Arbor, Michigan; Department of Clinical, Social and Administrative Sciences, University of Michigan College of Pharmacy,
| | - Jeffrey P. Gonzales
- From the Department of Pharmacy Practice, Purdue University School of Pharmacy and Pharmaceutical Sciences, Indianapolis, Indiana; Department of Pharmacy Practice and Science, University of Maryland School of Pharmacy, Baltimore, Maryland; Department of Pharmaceutical Sciences, University of Michigan, College of Pharmacy, Ann Arbor, Michigan; Department of Clinical, Social and Administrative Sciences, University of Michigan College of Pharmacy,
| | - Gordon L. Amidon
- From the Department of Pharmacy Practice, Purdue University School of Pharmacy and Pharmaceutical Sciences, Indianapolis, Indiana; Department of Pharmacy Practice and Science, University of Maryland School of Pharmacy, Baltimore, Maryland; Department of Pharmaceutical Sciences, University of Michigan, College of Pharmacy, Ann Arbor, Michigan; Department of Clinical, Social and Administrative Sciences, University of Michigan College of Pharmacy,
| | - Lynda S. Welage
- From the Department of Pharmacy Practice, Purdue University School of Pharmacy and Pharmaceutical Sciences, Indianapolis, Indiana; Department of Pharmacy Practice and Science, University of Maryland School of Pharmacy, Baltimore, Maryland; Department of Pharmaceutical Sciences, University of Michigan, College of Pharmacy, Ann Arbor, Michigan; Department of Clinical, Social and Administrative Sciences, University of Michigan College of Pharmacy,
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Affiliation(s)
- Stefan Balaz
- Department of Pharmaceutical Sciences, College of Pharmacy, North Dakota State University, Fargo, North Dakota 58105, USA.
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Sun Y, Sun J, Shi S, Jing Y, Yin S, Chen Y, Li G, Xu Y, He Z. Synthesis, Transport and Pharmacokinetics of 5′-Amino Acid Ester Prodrugs of 1-β-d-Arabinofuranosylcytosine. Mol Pharm 2008; 6:315-25. [DOI: 10.1021/mp800200a] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Yongbing Sun
- Departments of Biopharmaceutics, Pharmacology, and Medicinal Chemistry, Shenyang Pharmaceutical University, Shenyang, 110016, China, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, 113-0033, Japan, Division of Hematology/Oncology, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6547, and Institute of Pharmacology Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China
| | - Jin Sun
- Departments of Biopharmaceutics, Pharmacology, and Medicinal Chemistry, Shenyang Pharmaceutical University, Shenyang, 110016, China, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, 113-0033, Japan, Division of Hematology/Oncology, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6547, and Institute of Pharmacology Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China
| | - Shiliang Shi
- Departments of Biopharmaceutics, Pharmacology, and Medicinal Chemistry, Shenyang Pharmaceutical University, Shenyang, 110016, China, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, 113-0033, Japan, Division of Hematology/Oncology, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6547, and Institute of Pharmacology Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China
| | - Yongkui Jing
- Departments of Biopharmaceutics, Pharmacology, and Medicinal Chemistry, Shenyang Pharmaceutical University, Shenyang, 110016, China, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, 113-0033, Japan, Division of Hematology/Oncology, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6547, and Institute of Pharmacology Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China
| | - Shiliang Yin
- Departments of Biopharmaceutics, Pharmacology, and Medicinal Chemistry, Shenyang Pharmaceutical University, Shenyang, 110016, China, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, 113-0033, Japan, Division of Hematology/Oncology, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6547, and Institute of Pharmacology Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China
| | - Ying Chen
- Departments of Biopharmaceutics, Pharmacology, and Medicinal Chemistry, Shenyang Pharmaceutical University, Shenyang, 110016, China, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, 113-0033, Japan, Division of Hematology/Oncology, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6547, and Institute of Pharmacology Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China
| | - Gang Li
- Departments of Biopharmaceutics, Pharmacology, and Medicinal Chemistry, Shenyang Pharmaceutical University, Shenyang, 110016, China, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, 113-0033, Japan, Division of Hematology/Oncology, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6547, and Institute of Pharmacology Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China
| | - Youjun Xu
- Departments of Biopharmaceutics, Pharmacology, and Medicinal Chemistry, Shenyang Pharmaceutical University, Shenyang, 110016, China, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, 113-0033, Japan, Division of Hematology/Oncology, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6547, and Institute of Pharmacology Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China
| | - Zhonggui He
- Departments of Biopharmaceutics, Pharmacology, and Medicinal Chemistry, Shenyang Pharmaceutical University, Shenyang, 110016, China, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, 113-0033, Japan, Division of Hematology/Oncology, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6547, and Institute of Pharmacology Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China
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Li F, Maag H, Alfredson T. Prodrugs of nucleoside analogues for improved oral absorption and tissue targeting. J Pharm Sci 2008; 97:1109-34. [PMID: 17696166 DOI: 10.1002/jps.21047] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Nucleoside analogues are widely used for the treatment of antiviral infections and anticancer chemotherapy. However, many nucleoside analogues suffer from poor oral bioavailability due to their high polarity and low intestinal permeability. In order to improve oral absorption of these polar drugs, prodrugs have been employed to increase lipophilicity by chemical modification of the parent. Alternatively, prodrugs targeting transporters present in the intestine have been exploited to facilitate the transport of the nucleoside analogues. Valacyclovir and valganciclovir are two successful valine ester prodrugs transported by the PepT1 transporter. Recently, research efforts have focused on design of prodrugs for tissue specific delivery to improve efficacy and safety. This review presents advances of prodrug approaches for improved oral absorption of nucleoside analogues and recent developments in tissue targeting.
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Affiliation(s)
- Fujun Li
- Department of Pharmaceutics, Roche Palo Alto LLC, 3431 Hillview Avenue, Palo Alto, CA 94304, USA.
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hPEPT1 is responsible for uptake and transport of Gly-Sar in the human bronchial airway epithelial cell-line Calu-3. Pflugers Arch 2007; 456:611-22. [PMID: 18094991 DOI: 10.1007/s00424-007-0421-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2007] [Revised: 10/30/2007] [Accepted: 12/04/2007] [Indexed: 10/22/2022]
Abstract
The purpose of this work was to investigate the apical uptake and transepithelial transport of Gly-Sar along with the expression of the di-/tripeptide transporters hPEPT1 and hPEPT2 in human Calu-3 bronchial epithelial cells. The apical Gly-Sar uptake rate in Calu-3 cells followed Michaelis-Menten kinetics with a Km value of 1.3 +/- 0.3 mM and a Vmax value of 0.60 +/- 0.06 nmol cm(-2) min(-1). Transepithelial apical to basolateral transport of 50 microM [3H]-labelled Gly-Sar across the Calu-3 cell monolayer was pH-dependent. The Gly-Sar flux was significantly reduced in the presence of delta-aminolevulinic acid (2.5 mM), cephalexin (25 mM), and captopril (25 mM; p < 0.05, n = 3). Reverse transcriptase polymerase chain reaction (RT-PCR) revealed the presence of both hPEPT1 and hPEPT2 mRNA in the Calu-3 cells. These findings were confirmed in healthy human bronchial cDNA. Restriction-endonuclease analysis identified hPEPT2 in Calu-3 cells to be the hPEPT2*1 haplotype. Western blotting demonstrated expression of the hPEPT1 protein (approximately 80 kDa), and the immunolabel was mainly localized in the apical membrane as judged by immunolocalization studies using confocal laser scanning microscopy (CLSM). This work presents for the first time hPEPT1 and hPEPT2*1 expression in human Calu-3 cells. Surprisingly, the results indicate that Gly-Sar uptake and transport in Calu-3 cells are hPEPT1-mediated rather than hPEPT2-mediated.
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Larsen SB, Jørgensen FS, Olsen L. QSAR models for the human H(+)/peptide symporter, hPEPT1: affinity prediction using alignment-independent descriptors. J Chem Inf Model 2007; 48:233-41. [PMID: 18092768 DOI: 10.1021/ci700346y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A data set comprising the major known chemical classes of hPEPT1 ligands was compiled from the literature. For these compounds, alignment-independent descriptors (VolSurf, GRIND/Almond, and MOE) were computed. Using hierarchical partial least-squares projection to latent structures (H-PLS), a one-component model with r2 = 0.77 and q2 = 0.75 was obtained. The model satisfied a set of rigorous validation criteria and performed well in the prediction of an external test set. Mechanistic interpretation of the model reveals polarity properties to be the dominant factors in determining hPEPT1 affinity, with hydrophobic interactions contributing to a lesser extent. The model is superior to previously reported models due to its combination of quality and speed. Accordingly, it is suitable for ligand-based virtual screening, such as QSAR-based database mining.
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Affiliation(s)
- Simon Birksø Larsen
- Biostructural Research, Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, 2 Universitetsparken, DK-2100 Copenhagen, Denmark
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Thorn K, Andersen R, Christensen J, Jakobsen P, Nielsen CU, Steffansen B, Begtrup M. Design, Synthesis, and Evaluation of Tripeptidic Promoieties Targeting the Intestinal Peptide Transporter hPEPT1. ChemMedChem 2007; 2:479-87. [PMID: 17407174 DOI: 10.1002/cmdc.200600200] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The human intestinal proton coupled di/tri-peptide transporter hPEPT1 promotes the oral bioavailability of several drug compounds. The strategy behind the present work is that by linking a suitable di- or tripeptidic promoiety to a drug substance, by a hydrolysable ester bond, it may give rise to a prodrug that targets hPEPT1. 29 tripeptides were designed based on known structural requirements for substrates binding hPEPT1. Serine, homoserine, or threonine was incorporated in the tripeptide as hydroxy group donors in order for them to be linked to carboxylic drug substances. Optimisation of the promoiety included a study of 14 unnatural tripeptides whose diversity was expressed by VolSurf descriptors. A total of 29 tripeptides was synthesised by solid phase peptide synthesis and a standard Fmoc protocol. The affinity of the tripeptides to hPEPT1 was determined by measuring the inhibition of [(14)C]Gly-Sar in mature Caco-2 cell monolayers which resulted in K(i) values ranging from 0.22 to 25 mM or above. Translocation through the intestinal membrane, mediated by hPEPT1, was measured by recording the membrane potential relative to that induced by the known substrate Gly-Sar. The change in membrane potential is caused by influx of protons due to the co-transport of substrates and protons by hPEPT1 and is, as such, an indication of translocation. A K(i) value of 0.30 mM combined with efficient translocation indicated that H-Phe-Ser-Ala-OH is a suitable lead promoiety for targeted hPEPT1 prodrug design.
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Affiliation(s)
- Karina Thorn
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
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Kamphorst J, Cucurull-Sanchez L, Jones B. A performance evaluation of multiple classification models of human PEPT1 inhibitors and non-inhibitors. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/qsar.200630025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Fu X, Jiang S, Li C, Xin J, Yang Y, Ji R. Design and synthesis of novel bis(L-amino acid) ester prodrugs of 9-[2-(phosphonomethoxy)ethyl]adenine (PMEA) with improved anti-HBV activity. Bioorg Med Chem Lett 2006; 17:465-70. [PMID: 17074481 DOI: 10.1016/j.bmcl.2006.10.021] [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] [Received: 07/13/2006] [Revised: 09/28/2006] [Accepted: 10/10/2006] [Indexed: 11/20/2022]
Abstract
A series of novel bis(L-amino acid) ester prodrugs of 9-[2-(phosphonomethoxy)ethyl] adenine (PMEA) was synthesized and their anti-HBV activity was evaluated in HepG 2 2.2.15 cells. Compounds 11, 12, 21, 22, 26, and 27 demonstrated more potent anti-HBV activity and higher selective index (SI) than adefovir dipivoxil, which was used as a positive control. Compound 11, which was found to be the most potent one, was five times more potent than adefovir dipivoxil with EC50 value of 0.095 microM and CC50 value of 6636 microM. The SI value (>69,000) of compound 11 was 60 times and 24 times higher than those of adefovir dipivoxil and lamivudine, respectively. In vitro stability studies showed that compound 11 was relatively more stable than adefovir dipivoxil with t1/2 of 270 min. These findings suggested that compound 11 could be considered as a promising candidate for further in vivo studies.
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Affiliation(s)
- Xiaozhong Fu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institute for Biological Sciences, Chinese Academy of Science, Shanghai 201203, China
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Biegel A, Knütter I, Hartrodt B, Gebauer S, Theis S, Luckner P, Kottra G, Rastetter M, Zebisch K, Thondorf I, Daniel H, Neubert K, Brandsch M. The renal type H+/peptide symporter PEPT2: structure-affinity relationships. Amino Acids 2006; 31:137-56. [PMID: 16868651 DOI: 10.1007/s00726-006-0331-0] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2005] [Accepted: 01/04/2006] [Indexed: 10/24/2022]
Abstract
The H(+)/peptide cotransporter PEPT2 is expressed in a variety of organs including kidney, lung, brain, mammary gland, and eye. PEPT2 substrates are di- and tripeptides as well as peptidomimetics, such as beta-lactam antibiotics. Due to the presence of PEPT2 at the bronchial epithelium, the aerosolic administration of peptide-like drugs might play a major role in future treatment of various pulmonary and systemic diseases. Moreover, PEPT2 has a significant influence on the in vivo disposition and half-life time of peptide-like drugs within the body, particularly in kidney and brain. PEPT2 is known to have similar but not identical structural requirements for substrate recognition and transport compared to PEPT1, its intestinal counterpart. In this review we compiled available affinity constants of 352 compounds, measured at different mammalian tissues and expression systems and compare the data whenever possible with those of PEPT1.
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Affiliation(s)
- A Biegel
- Institute of Biochemistry, Department of Biochemistry/Biotechnology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
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Vig BS, Stouch TR, Timoszyk JK, Quan Y, Wall DA, Smith RL, Faria TN. Human PEPT1 Pharmacophore Distinguishes between Dipeptide Transport and Binding. J Med Chem 2006; 49:3636-44. [PMID: 16759105 DOI: 10.1021/jm0511029] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The human intestinal oligopeptide transporter (PEPT1) facilitates the absorption of dipeptides, tripeptides, and many peptidomimetic drugs. In this study, a large number of peptides were selected to investigate the structural features required for PEPT1 transport. Binding affinity was determined in a Gly-Sar uptake inhibition assay, whereas functional transport was ranked in a membrane depolarization assay. Although most of the peptides tested could bind to PEPT1, not all were substrates. As expected, single amino acids and tetrapeptides could not bind to or be transported by PEPT1. Dipeptide transport was influenced by charge, hydrophobicity, size, and side chain flexibility. The extent of transport was variable, and unexpectedly, some dipeptides were not substrates of PEPT1. These included dipeptides with two positive charges or extreme bulk in either position 1 or 2. Our results identify key features required for PEPT1 transport in contrast to most previously described pharmacophores, which are based on the inhibition of transport of a known substrate.
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Affiliation(s)
- Balvinder S Vig
- Exploratory Biopharmaceutics and Stability, and Macromolecular Structure/CADD, Pharmaceutical Research Institute, Bristol-Myers Squibb Company, New Brunswick, New Jersey 08903-0191, USA
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Brandsch M. Transport of L-proline, L-proline-containing peptides and related drugs at mammalian epithelial cell membranes. Amino Acids 2006; 31:119-36. [PMID: 16622594 DOI: 10.1007/s00726-006-0307-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2005] [Accepted: 02/22/2006] [Indexed: 10/24/2022]
Abstract
Membrane transport of L-proline has received considerable attention in basic and pharmaceutical research recently. Of the most recently cloned members of the solute carrier family, two are "proline transporters". The amino acid transporter PAT1, expressed in intestine, kidney, brain and other organs, mediates the uptake of proline and derivatives in a pH gradient-dependent manner. The Na(+)-dependent proline transporter SIT1, cloned in 2005, exhibits the properties of the long-sought classical IMINO system. Proline-containing peptides are of interest for several reasons. Many biologically important peptide sequences contain highly conserved proline residues. Xaa-Pro peptides are very often resistant to enzymatic hydrolysis and display, in contrast to Pro-Xaa peptides, a high affinity to the H(+)/peptide cotransporter PEPT1 which is expressed in intestinal, renal, lung and biliary duct epithelial cells. Furthermore, several orally available drugs are recognized by PEPT1 as Xaa-Pro analogues due to their sterical resemblance to small peptides.
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Affiliation(s)
- M Brandsch
- Membrane Transport Group, Biozentrum, Martin-Luther-University Halle-Wittenberg, Halle, Germany.
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Våbenø J, Nielsen CU, Steffansen B, Lejon T, Sylte I, Jørgensen FS, Luthman K. Conformational restrictions in ligand binding to the human intestinal di-/tripeptide transporter: implications for design of hPEPT1 targeted prodrugs. Bioorg Med Chem 2005; 13:1977-88. [PMID: 15727852 DOI: 10.1016/j.bmc.2005.01.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2004] [Revised: 01/05/2005] [Accepted: 01/12/2005] [Indexed: 11/16/2022]
Abstract
The aim of the present study was to develop a computational method aiding the design of dipeptidomimetic pro-moieties targeting the human intestinal di-/tripeptide transporter hPEPT1. First, the conformation in which substrates bind to hPEPT1 (the bioactive conformation) was identified by conformational analysis and 2D dihedral driving analysis of 15 hPEPT1 substrates, which suggested that psi(1) approximately 165 degrees , omega(1) approximately 180 degrees , and phi(2) approximately 280 degrees were descriptive of the bioactive conformation. Subsequently, the conformational energy required to change the peptide backbone conformation (DeltaE(bbone)) from the global energy minimum conformation to the identified bioactive conformation was calculated for 20 hPEPT1 targeted model prodrugs with known K(i) values. Quantitatively, an inverse linear relationship (r(2)=0.81, q(2)=0.80) was obtained between DeltaE(bbone) and log1/K(i), showing that DeltaE(bbone) contributes significantly to the experimentally observed affinity for hPEPT1 ligands. Qualitatively, the results revealed that compounds classified as high affinity ligands (K(i)<0.5 mM) all have a calculated DeltaE(bbone)<1 kcal/mol, whereas medium and low-affinity compounds (0.5 mM<K(i)<15 mM) have DeltaE(bbone) values in the range 1-3 kcal/mol. The findings also shed new light on the basis for the experimentally observed stereoselectivity of hPEPT1.
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Affiliation(s)
- Jon Våbenø
- Department of Medicinal Chemistry, Institute of Pharmacy, University of Tromsø, N-9037 Tromsø, Norway
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Steffansen B, Nielsen CU, Frokjaer S. Delivery aspects of small peptides and substrates for peptide transporters. Eur J Pharm Biopharm 2005; 60:241-5. [PMID: 15908190 DOI: 10.1016/j.ejpb.2005.01.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2004] [Revised: 01/07/2005] [Accepted: 01/10/2005] [Indexed: 11/26/2022]
Abstract
The present summary highlight chemical strategies applied to improve plasma half-lives and oral bioavailability of peptidic drugs as well as view on intestinal and pancreatic peptidase mediated degradation of peptidic drugs. In general chemical strategies used to increase the oral bioavailability of peptidic drugs consisting of more than three amino acids is disappointing. On the other hand chemical approaches to stabilize peptidic drugs against metabolism seem promising for increasing plasma half-lives of parental peptidic drugs as well as for increasing oral bioavailability of di/tripeptidomimetics and dipeptidyl pro-moieties targeting peptide transporters.
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Affiliation(s)
- Bente Steffansen
- Molecular Biopharmaceutics, Department of Pharmaceutics, The Danish University of Pharmaceutical Sciences, Copenhagen, Denmark.
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Nielsen CU, Våbenø J, Andersen R, Brodin B, Steffansen B. Recent advances in therapeutic applications of human peptide transporters. Expert Opin Ther Pat 2005. [DOI: 10.1517/13543776.15.2.153] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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29
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Song X, Vig BS, Lorenzi PL, Drach JC, Townsend LB, Amidon GL. Amino acid ester prodrugs of the antiviral agent 2-bromo-5,6-dichloro-1-(beta-D-ribofuranosyl)benzimidazole as potential substrates of hPEPT1 transporter. J Med Chem 2005; 48:1274-7. [PMID: 15715497 DOI: 10.1021/jm049450i] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Amino acid ester prodrugs of 2-bromo-5,6-dichloro-1-(beta-d-ribofuranosyl)benzimidazole (BDCRB) were synthesized and evaluated for their affinity for hPEPT1, an intestinal oligopeptide transporter. Assays of competitive inhibition of [(3)H]glycylsarcosine (Gly-Sar) uptake in HeLa/hPEPT1 cells by the amino acid ester prodrugs of BDCRB suggested their 2- to 4-fold higher affinity for hPEPT1 compared to BDCRB. Further, promoieties with hydrophobic side chains and l-configuration were preferred by the hPEPT1 transporter.
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Affiliation(s)
- Xueqin Song
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, Michigan 48109-1065, USA
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Song X, Lorenzi PL, Landowski CP, Vig BS, Hilfinger JM, Amidon GL. Amino Acid Ester Prodrugs of the Anticancer Agent Gemcitabine: Synthesis, Bioconversion, Metabolic Bioevasion, and hPEPT1-Mediated Transport. Mol Pharm 2005; 2:157-67. [PMID: 15804190 DOI: 10.1021/mp049888e] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Gemcitabine, a clinically effective nucleoside anticancer agent, is a polar drug with low membrane permeability and is administered intravenously. Further, extensive degradation of gemcitabine by cytidine deaminase to an inactive metabolite in the liver affects its activity adversely. Thus, strategies that provide both enhanced transport and high metabolic bioevasion would potentially lead to oral alternatives that may be clinically useful. The objective of this study was to evaluate whether amino acid ester prodrugs of gemcitabine would (a) facilitate transport across intestinal membranes or across cells that express hPEPT1 and (b) provide resistance to deamination by cytidine deaminase. 3'-Monoester, 5'-monoester, and 3',5'-diester prodrugs of gemcitabine utilizing aliphatic (L-valine, D-valine, and L-isoleucine) and aromatic (L-phenylalanine and D-phenylalanine) amino acids as promoieties were synthesized and evaluated for their affinity and direct hPEPT1-mediated transport in HeLa/hPEPT1 cells. All prodrugs exhibited enhanced affinity (IC(50): 0.14-0.16 mM) for the transporter. However, only the 5'-L-valyl and 5'-L-isoleucyl monoester prodrugs exhibited (a) increased uptake (11.25- and 5.64-fold, respectively) in HeLa/hPEPT1 cells compared to HeLa cells and (b) chemical stability in buffers, that were comparable to valacyclovir, a commercially marketed oral amino acid ester prodrug. The widely disparate enzymatic bioconversion profiles of the 5'-L-valyl and 5'-L-isoleucyl prodrugs in Caco-2 cell homogenates along with their significant resistance to deamination by cytidine deaminase suggest that the disposition of gemcitabine following oral administration would be controlled by the rate of bioconversion following transport across the intestinal epithelial membrane. The combined results also suggest that it may be possible to modulate these characteristics by the choice of the amino acid promoiety.
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Affiliation(s)
- Xueqin Song
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109, USA
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Steffansen B, Nielsen CU, Brodin B, Eriksson AH, Andersen R, Frokjaer S. Intestinal solute carriers: an overview of trends and strategies for improving oral drug absorption. Eur J Pharm Sci 2004; 21:3-16. [PMID: 14706808 DOI: 10.1016/j.ejps.2003.10.010] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A large amount of absorptive intestinal membrane transporters play an important part in absorption and distribution of several nutrients, drugs and prodrugs. The present paper gives a general overview on intestinal solute carriers as well as on trends and strategies for targeting drugs and/or prodrugs to these carriers in order to increasing oral bioavailability and distribution. A number of absorptive intestinal transporters are described in terms of gene and protein classification, driving forces, substrate specificities and cellular localization. When targeting absorptive large capacity membrane transporters in the small intestine in order to increase oral bioavailabilities of drug or prodrug, the major influence on in vivo pharmacokinetics is suggested to be dose-dependent increase in bioavailability as well as prolonged blood circulation due to large capacity facilitated absorption, and renal re-absorption, respectively. In contrast, when targeting low-capacity transporters such as vitamin transporters, dose independent saturable absorption kinetics are suggested. We thus believe that targeting drug substrates for absorptive intestinal membrane transporters could be a feasible strategy for optimizing drug bioavailability and distribution.
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Affiliation(s)
- Bente Steffansen
- Department of Pharmaceutics, The Danish University of Pharmaceutical Sciences, 2 Universitetsparken, DK-2100 Copenhagen, Denmark.
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Våbenø J, Nielsen CU, Ingebrigtsen T, Lejon T, Steffansen B, Luthman K. Dipeptidomimetic Ketomethylene Isosteres as Pro-moieties for Drug Transport via the Human Intestinal Di-/Tripeptide Transporter hPEPT1: Design, Synthesis, Stability, and Biological Investigations. J Med Chem 2004; 47:4755-65. [PMID: 15341490 DOI: 10.1021/jm040780c] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Five dipeptidomimetic-based model prodrugs containing ketomethylene amide bond replacements were synthesized from readily available alpha,beta-unsaturated gamma-ketoesters. The model drug (BnOH) was attached to the C-terminus or to one of the side chain positions of the dipeptidomimetic. The stability, the affinity for the di-/tripeptide transporter hPEPT1, and the transepithelial transport properties of the model prodrugs were investigated. ValPsi[COCH(2)]Asp(OBn) was the compound with highest chemical stability in buffers at pH 6.0 and 7.4, with half-lives of 190 and 43 h, respectively. All five compounds showed high affinity for hPEPT1 (K(i) values < 1 mM), and PhePsi[COCH(2)]Asp(OBn) and ValPsi[COCH(2)]Asp(OBn) had the highest affinities with K(i) values of 68 and 19 microM, respectively. An hPEPT1-mediated transport component was demonstrated for the transepithelial transport of three compounds, a finding that was corroborated by hPEPT1-mediated intracellular uptake. The results indicate that the stabilized Phe-Asp and Val-Asp derivatives are promising pro-moieties in a prodrug approach targeting hPEPT1.
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Affiliation(s)
- Jon Våbenø
- Department of Medicinal Chemistry, Institute of Pharmacy, University of Tromsø, N-9037 Tromsø, Norway
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Pinsonneault J, Nielsen CU, Sadée W. Genetic variants of the human H+/dipeptide transporter PEPT2: analysis of haplotype functions. J Pharmacol Exp Ther 2004; 311:1088-96. [PMID: 15282265 DOI: 10.1124/jpet.104.073098] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
PEPT2 is a high-affinity H+/dipeptide transporter expressed in kidney, brain, lung, and mammary gland. The physiological role of PEPT2 in kidney is to reabsorb small peptides generated by luminal peptidases. PEPT2 is also a transporter for peptide-like drugs such as penicillins and cephalosporins. We have conducted a haplotype analysis of 27 single nucleotide polymorphisms located in or near exons of the human gene encoding hPEPT2 (SLC15A2), using genotyping data from 247 genomic DNA samples from the Coriell collection. Our analysis reveals that hPEPT2 has a >6-kilobase sequence block with at least 10 abundant polymorphisms in almost complete linkage disequilibrium. As a result, only two main hPEPT2 variants exist (hPEPT2*1 and *2) with several phased amino acid substitutions, present in substantial frequencies in all ethnic groups tested. When expressed in Chinese hamster ovary cells, hPEPT2*1 and *2 displayed similar Vmax values for glycyl-sarcosine (Gly-Sar), but they differed significantly in their Km values (83 +/- 16 and 233 +/- 38 microM, respectively). Moreover, hPEPT2*1 and *2 differed in their pH sensitivity for H+/Gly-Sar transport. In addition, hPEPT2*1 and *2 generated varying levels of mRNA in nine heterozygous kidney tissue samples, including one allele expressing no detectable mRNA, suggesting the presence of cis-acting polymorphisms affecting transcription or mRNA processing. The results indicate that polymorphisms in the gene encoding hPEPT2 can alter substrate transport and therefore could affect drug disposition in vivo.
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Affiliation(s)
- Julia Pinsonneault
- Department of Pharmacology, 333 West 10th Ave., The Ohio State University, Columbus OH 43210-1239, USA.
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Neumann J, Bruch M, Gebauer S, Brandsch M. Transport of the phosphonodipeptide alafosfalin by the H+/peptide cotransporters PEPT1 and PEPT2 in intestinal and renal epithelial cells. ACTA ACUST UNITED AC 2004; 271:2012-7. [PMID: 15128310 DOI: 10.1111/j.1432-1033.2004.04114.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The interaction of the antibacterial phosphonodipeptide alafosfalin with mammalian H(+)/peptide cotransporters was studied in Caco-2 cells, expressing the low-affinity intestinal type peptide transporter 1 (PEPT1), and SKPT cells, expressing the high-affinity renal type peptide transporter 2 (PEPT2). Alafosfalin strongly inhibited the uptake of [(14)C]glycylsarcosine with K(i) values of 0.19 +/- 0.01 mm and 0.07 +/- 0.01 mm for PEPT1 and PEPT2, respectively. Saturation kinetic studies revealed that in both cell types alafosfalin affected only the affinity constant (K(t)) but not the maximal velocity (V(max)) of glycylsarcosine (Gly-Sar) uptake. The inhibition constants and the competitive nature of inhibition were confirmed in Dixon-type experiments. Caco-2 cells and SKPT cells were also cultured on permeable filters: apical uptake and transepithelial apical to basolateral flux of [(14)C]Gly-Sar across Caco-2 cell monolayers were reduced by alafosfalin (3 mm) by 73%. In SKPT cells, uptake of [(14)C]Gly-Sar but not flux was inhibited by 61%. We found no evidence for an inhibition of the basolateral to apical uptake or flux of [(14)C]Gly-Sar by alafosfalin. Alafosfalin (3 mm) did not affect the apical to basolateral [(14)C]mannitol flux. Determined in an Ussing-type experiment with Caco-2 cells cultured in Snapwells trade mark, alafosfalin increased the short-circuit current through Caco-2 cell monolayers. We conclude that alafosfalin interacts with both H(+)/peptide symporters and that alafosfalin is actively transported across the intestinal epithelium in a H(+)-symport, explaining its oral availability. The results also demonstrate that dipeptides where the C-terminal carboxyl group is substituted by a phosphonic function represent high-affinity substrates for mammalian H(+)/peptide cotransporters.
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Affiliation(s)
- Jana Neumann
- Membrane Transport Group, Biozentrum, Martin-Luther-University Halle-Wittenburg, Halle, Germany
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Våbenø J, Lejon T, Nielsen CU, Steffansen B, Chen W, Ouyang H, Borchardt RT, Luthman K. Phe-Gly Dipeptidomimetics Designed for the Di-/Tripeptide Transporters PEPT1 and PEPT2: Synthesis and Biological Investigations. J Med Chem 2004; 47:1060-9. [PMID: 14761208 DOI: 10.1021/jm031022+] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of five Phe-Gly dipeptidomimetics containing different amide bond replacements have been synthesized in a facile way from the readily available unsaturated ketoester 1, and their affinities for the di-/tripeptide transporters hPEPT1 (Caco-2 cells) and rPEPT2 (SKPT cells) were tested. The compounds contained the amide bond isosteres ketomethylene (2a), (R)- and (S)-hydroxyethylidene (3a and 4a), and (R)- and (S)-hydroxyethylene (5a and 6a) to provide information on the conformational and stereochemical requirements for hPEPT1 and rPEPT2 affinity. The affinity studies showed that for rPEPT2 there is no significant difference in affinity between the ketomethylene isostere 2a and the natural substrate Phe-Gly (K(i) values of 18.8 and 14.6 microM, respectively). Also the affinities for hPEPT1 are in the same range (K(i) values of 0.40 and 0.20 mM, respectively). This corroborates earlier findings that the amide bond as such is not essential for binding to PEPTX, but the results also reveal possible differences in the binding of ketomethylene isosteres to hPEPT1 and rPEPT2. The trans-hydroxyethylidene and hydroxyethylene isosteres proved to be poor substrates for PEPTX. These results provide new information about the importance of flexibility and of the stereochemistry at the C(4)-position for this class of compounds. Furthermore, the intracellular uptake of 2a-4a in Caco-2 cells was investigated, showing a 3-fold reduction of the uptake of 2a in the presence of the competetive inhibitor Gly-Pro, indicating contribution from an active transport component. No active uptake of 3a and 4a was observed. Transepithelial transport studies also indicated active transport of 2a across Caco-2 monolayers.
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Affiliation(s)
- Jon Våbenø
- Department of Medicinal Chemistry, Institute of Pharmacy, University of Tromsø, N-9037 Tromsø, Norway
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Brandsch M, Knütter I, Leibach FH. The intestinal H+/peptide symporter PEPT1: structure–affinity relationships. Eur J Pharm Sci 2004; 21:53-60. [PMID: 14706811 DOI: 10.1016/s0928-0987(03)00142-8] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Peptide transporter 1, PEPT1, of the mammalian enterocyte is presently under intense investigation in many laboratories because of its nutritional importance in the absorption of protein hydrolysis products and because more recent studies have shown that many drugs and prodrugs gain entry into the systemic circulation via PEPT1. Until the exact structural features of the substrate binding site of PEPT1 become available, for example by X-ray crystallography, determination of affinities followed by proof of actual membrane translocation will have to suffice when testing for possible new substrates for PEPT1. Affinity constants reflect the strength of their interaction with the binding site of the transporter. A review of the literature shows a wide range of affinity constants between 2 microM and 30 mM. We consider affinity constants for substrates or inhibitors of PEPT1 lower than 0.5 mM as high affinity, between 0.5 and 5.0 mM as medium affinity and above 5 mM as low affinity. Values above 15 mM we consider with great caution. In this mini-review we discuss affinities and structural determinants which affect affinities of a variety of substrates for PEPT1.
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Affiliation(s)
- Matthias Brandsch
- Membrane Transport Group, Biozentrum of Martin-Luther-University Halle-Wittenberg, Weinbergweg 22, D-06120 Halle, Germany.
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Faria TN, Timoszyk JK, Stouch TR, Vig BS, Landowski CP, Amidon GL, Weaver CD, Wall DA, Smith RL. A Novel High-Throughput PepT1 Transporter Assay Differentiates between Substrates and Antagonists. Mol Pharm 2003; 1:67-76. [PMID: 15832502 DOI: 10.1021/mp034001k] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
PepT1 is a transporter of proven pharmaceutical utility for enhancing oral absorption. A high-throughput, robust functional assay, capable of distinguishing PepT1 binders from substrates, allowing identification and/or prediction of drug candidate activation was developed. An MDCK epithelial cell line was transfected with rPepT1. The high level of stable rPepT1 expression that was achieved enabled development of a miniaturized PepT1 assay in a 96-well format, which could be scaled to 384 wells. The assay is based on measurement of membrane depolarization resulting from the cotransport of protons and PepT1 substrates. Membrane potential changes are tracked with a voltage-sensitive fluorescent indicator. Control (mock-transfected) cells are used to determine nonspecific membrane potential changes. A variety of fluorescent dyes were tested during initial assay design, including intracellular pH and membrane potential indicators. A membrane potential indicator was chosen because of its superior performance. Upon PepT1 activation with glycylsarcosine, dose-dependent membrane depolarization was observed with an EC50 of 0.49 mM. Maximum depolarization was dependent on the level of PepT1 expression. Testing of 38 known PepT1 substrates, binders, and nonbinders demonstrated that this assay accurately distinguished substrates from binders and from nonbinders. Initial validation of this novel assay indicates that it is sensitive and robust, and can distinguish between transporter substrates and antagonists. This important distinction has been previously achieved only with lower-throughput assays. This assay might also be used to determine substrate potency and establish a high-quality data set for PepT1 SAR modeling.
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Affiliation(s)
- Teresa N Faria
- Biopharmaceutics Research and Development, Macromolecular Structure/CADD, and Lead Discovery, Pharmaceutical Research Institute, Bristol-Myers Squibb Company, New Brunswick, New Jersey 08903-0191, USA.
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