pGlu-L-Dopa-Pro: a tripeptide prodrug targeting the intestinal peptide transporter for absorption and tissue enzymes for conversion.

Abstract:

PURPOSE:The purpose of this study is to investigate the characteristics of pGlu-L-Dopa-Pro as a prodrug of L-Dopa. METHODS:pGlu-L-Dopa-Pro and L-Dopa-Pro were synthesized using the standard procedures of peptide synthesis. The conversion of pGlu-L-Dopa-Pro to L-Dopa was studied using pyroglutamyl aminopeptidase I and prolidase. With rats as the animal model, the stability of pGlu-L-Dopa-Pro in intestinal homogenates was determined, then the transport characteristics of pGlu-L-Dopa-Pro were studied using in-situ perfusion and Ussing chambers. RESULTS:pGlu-L-Dopa-Pro, relatively stable in intestinal homogenates and intestinal fluid, had a dimensionless permeability of 1.8 at 0.04 mM. Its intestinal permeability was significantly inhibited by 20 mM captopril, by a mixture of dipeptides, 80 mM Gly-Gly and 5 mM Gly-Pro, and by 2 mM cephradine. Further, in Ussing chambers, its mucosal to serosal permeability decreased dramatically with concentration. Conversion studies showed that pGlu-L-Dopa-Pro was degraded by pyroglutamyl aminopeptidase I, an enzyme releasing the N-terminal pyroglutamic acid, with Vmax and Km of 0.6 mumole/min/g protein and 21 mM, respectively, and that L-Dopa-Pro was degraded by prolidase with Vmax and Km of 44 mumole/min/g protein and 0.48 mM, respectively. CONCLUSIONS:This tripeptide, a potential prodrug of L-Dopa, is absorbed by the intestinal peptide transporter, is relatively stable in the gut wall, and is converted to L-Dopa by peptidases with the cleavage by pyroglutamyl aminopeptidase I to L-Dopa-Pro as the rate limiting step.

journal_name

Pharm Res

journal_title

Pharmaceutical research

authors

Bai JP

doi

10.1023/a:1016239321494

subject

Has Abstract

pub_date

1995-07-01 00:00:00

pages

1101-4

issue

7

eissn

0724-8741

issn

1573-904X

journal_volume

12

pub_type

杂志文章
  • Pharmacokinetic and biodistribution profile of recombinant human interleukin-10 following intravenous administration in rats with extensive liver fibrosis.

    abstract:PURPOSE:Because interleukin-10 (IL-10) seems a promising new antifibrotic drug, we investigated the pharmacokinetic and biodistribution profile of this potent therapeutic cytokine in rats with extensive liver fibrosis (BDL-3). IL-10 receptor expression was also determined in relation to these aspects. METHODS:To study...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/b:pham.0000048199.94510.b0

    authors: Rachmawati H,Beljaars L,Reker-Smit C,Van Loenen-Weemaes AM,Hagens WI,Meijer DK,Poelstra K

    更新日期:2004-11-01 00:00:00

  • Prolonged blood circulation in rats of nanospheres surface-modified with semitelechelic poly[N-(2-hydroxypropyl)methacrylamide].

    abstract::Semitelechelic poly[N-(2-hydroxypropyl)methacrylamide]s (ST-PHPMA) containing one amino end-group and differing in molecular weight were synthesized by radical polymerization in the presence of 2-aminoethanethiol (AET) as chain transfer agent. These polymers were covalently attached via amide bonds to the surface of n...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1016247206531

    authors: Kamei S,Kopecek J

    更新日期:1995-05-01 00:00:00

  • High sensitivity differential scanning calorimetry study of DNA-cationic liposome complexes.

    abstract:PURPOSE:To investigate plasmid DNA interactions with liposomes prepared from dimyristoylglyceroethylphosphocholine (EDMPC) and DOPE using high sensitivity differential scanning calorimetry (HSDSC). MATERIALS AND METHODS:Large unilamellar liposomes of EDMPC with DOPE (mol ratio 0-50%) were prepared. Plasmid DNA was add...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-007-9325-1

    authors: Saunders M,Taylor KM,Craig DQ,Palin K,Robson H

    更新日期:2007-10-01 00:00:00

  • Improved prediction of in vivo peroral absorption from in vitro intestinal permeability using an internal standard to control for intra- and inter-rat variability.

    abstract:PURPOSE:To evaluate the use of an in vitro intestinal permeability model to predict rat and human absorption as well as to evaluate the use of an internal standard to control for intra- and inter-rat variability. METHODS:In vivo peroral absorption and in vitro steady-state intestinal permeability coefficients were det...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1012148300807

    authors: Dowty ME,Dietsch CR

    更新日期:1997-12-01 00:00:00

  • Development and in vivo evaluation of an oral delivery system for low molecular weight heparin based on thiolated polycarbophil.

    abstract:PURPOSE:It was the purpose of this study to develop a new oral drug delivery system for low molecular weight heparin (LMWH) providing an improved bioavailability and a prolonged therapeutic effect. METHODS:The permeation enhancing polycarbophil-cysteine conjugate (PCP-Cys) used in this study displayed 111.4 +/- 6.4 mi...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1023803706746

    authors: Kast CE,Guggi D,Langoth N,Bernkop-Schnürch A

    更新日期:2003-06-01 00:00:00

  • The influence of cytotoxicity of macromolecules and of VEGF gene modulated vascular permeability on the enhanced permeability and retention effect in resistant solid tumors.

    abstract:PURPOSE:To study the influence of cytotoxicity of macromolecules, VEGF gene expression, and vascular permeability on the enhanced permeability and retention (EPR) effect. METHODS:Mice bearing xenografts of A2780 multidrug resistant human ovarian carcinoma were treated by free doxorubicin (DOX) and N-(2-hydroxypropyl)m...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1007500412442

    authors: Minko T,Kopeckova P,Pozharov V,Jensen KD,Kopecek J

    更新日期:2000-05-01 00:00:00

  • Fatty acid-RGD peptide amphiphile micelles as potential paclitaxel delivery carriers to α(v)β₃ integrin overexpressing tumors.

    abstract:PURPOSE:To design and synthesize fatty acid-RGD peptide amphiphiles with ADA linker for their potential delivery of hydrophobic drugs like paclitaxel targeted to α(v)β(3) integrin overexpressing tumors. METHODS:Four amphiphiles - C16 or C18 fatty acid-RGD peptide and ADA linker were designed and synthesized. CMC, size...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-012-0830-5

    authors: Javali NM,Raj A,Saraf P,Li X,Jasti B

    更新日期:2012-12-01 00:00:00

  • Pectin and Mucin Enhance the Bioadhesion of Drug Loaded Nanofibrillated Cellulose Films.

    abstract:PURPOSE:Bioadhesion is an important property of biological membranes, that can be utilized in pharmaceutical and biomedical applications. In this study, we have fabricated mucoadhesive drug releasing films with bio-based, non-toxic and biodegradable polymers that do not require chemical modifications. METHODS:Nanofibr...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-018-2428-z

    authors: Laurén P,Paukkonen H,Lipiäinen T,Dong Y,Oksanen T,Räikkönen H,Ehlers H,Laaksonen P,Yliperttula M,Laaksonen T

    更新日期:2018-05-22 00:00:00

  • Probing the Distribution of Water in a Multi-Component System by Solid-State NMR Spectroscopy.

    abstract:PURPOSE:To characterize the distribution of water among various components in a powder blend using solid-state NMR spectroscopy. METHODS:Water sorption behavior of theophylline anhydrate and excipients was determined by dynamic vapor sorption (DVS) and Karl Fischer Titration (KFT) after storing them in humidity chambe...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-016-1972-7

    authors: Mistry P,Chakravarty P,Lubach JW

    更新日期:2016-10-01 00:00:00

  • Comparative brain exposure to (-)-carbovir after (-)-carbovir or (-)-6-aminocarbovir intravenous infusion in rats.

    abstract:PURPOSE:Evaluate the ability of (-)-6-aminocarbovir ((-)-6AC) to improve the CNS exposure to (-)-carbovir ((-)-CBV). METHODS:Activation of (-)-6AC in vitro was assessed by incubations of rat brain tissue homogenates. The in vivo brain exposure to (-)-CBV was then examined in rats after iv infusions of either (-)-CBV (...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1016229624703

    authors: Wen YD,Remmel RP,Pham PT,Vince R,Zimmerman CL

    更新日期:1995-06-01 00:00:00

  • A physiologic model for simulating gastrointestinal flow and drug absorption in rats.

    abstract:PURPOSE:The development of a physiologically based absorption model for orally administered drugs in rats is described. METHODS:Unlike other models that use a multicompartmental approach, the GI tract is modeled as a continuous tube with spatially varying properties. The mass transport through the intestinal lumen is ...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/b:pham.0000003373.72652.c0

    authors: Willmann S,Schmitt W,Keldenich J,Dressman JB

    更新日期:2003-11-01 00:00:00

  • Release of plasmid DNA-encoding IL-10 from PLGA microparticles facilitates long-term reversal of neuropathic pain following a single intrathecal administration.

    abstract:PURPOSE:Interleukin-10 (IL-10) is an anti-inflammatory molecule that has achieved interest as a therapeutic for neuropathic pain. In this work, the potential of plasmid DNA-encoding IL-10 (pDNA-IL-10) slowly released from biodegradable microparticles to provide long-term pain relief in an animal model of neuropathic pa...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-010-0077-y

    authors: Soderquist RG,Sloane EM,Loram LC,Harrison JA,Dengler EC,Johnson SM,Amer LD,Young CS,Lewis MT,Poole S,Frank MG,Watkins LR,Milligan ED,Mahoney MJ

    更新日期:2010-05-01 00:00:00

  • Lack of Association of Generic Brittle Status with Genetics and Physiologic Measures in Patients with Epilepsy.

    abstract:PURPOSE:A patient was denoted to be generic brittle (GB) if they had a negative opinion about generics (e.g. prior history of a switch problem) or took the innovator brand of their most problematic anti-epileptic drug (AED) when generic was available. The aim of this hypothesis-generating study was to assess possible g...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-020-2781-6

    authors: Das S,Guo D,Jiang X,Jiang W,Shu Y,Ting TY,Polli JE

    更新日期:2020-02-26 00:00:00

  • Oral delivery of sodium cromolyn: preliminary studies in vivo and in vitro.

    abstract:PURPOSE:Herein we report the discovery of a group of derivatized alpha-amino acids that increase the oral bioavailability of sodium cromolyn. METHODS:We prepared three N-acylated alpha-amino acids and used these compounds to demonstrate the oral delivery of cromolyn in an in vivo rat model. In vitro experiments, inclu...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1016034913181

    authors: Leone-Bay A,Leipold H,Sarubbi D,Variano B,Rivera T,Baughman RA

    更新日期:1996-02-01 00:00:00

  • Characterization of the mechanism of zidovudine uptake by rat conditionally immortalized syncytiotrophoblast cell line TR-TBT.

    abstract:PURPOSE:To characterize the uptake mechanism of zidovudine (AZT), a nucleoside reverse transcriptase inhibitor, in syncytiotrophoblast cells using the TR-TBT 18d-1 cell line previously established by our group. MATERIALS AND METHODS:The effects of several transporter inhibitors on the initial and steady-state apical u...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-008-9564-9

    authors: Sai Y,Nishimura T,Shimpo S,Chishu T,Sato K,Kose N,Terasaki T,Mukai C,Kitagaki S,Miyakoshi N,Kang YS,Nakashima E

    更新日期:2008-07-01 00:00:00

  • Enhanced protein delivery from photopolymerized hydrogels using a pseudospecific metal chelating ligand.

    abstract:PURPOSE:This study was conducted to investigate the cause of incomplete protein release from photopolymerized poly(ethylene glycol) (PEG) hydrogels and verify the protein-protection mechanism provided by iminodiacetic acid (IDA). METHODS:The in vitro release of bovine serum albumin (BSA) from PEG hydrogels prepared un...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-005-9395-x

    authors: Lin CC,Metters AT

    更新日期:2006-03-01 00:00:00

  • The Influence of Stabilized Deconjugated Ursodeoxycholic Acid on Polymer-Hydrogel System of Transplantable NIT-1 Cells.

    abstract:PURPOSE:The encapsulation of pancreatic β-cells in biocompatible matrix has generated great interest in diabetes treatment. Our work has shown improved microcapsules when incorporating the bile acid ursodeoxycholic acid (UDCA), in terms of morphology and cell viability although cell survival remained low. Thus, the stu...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-016-1863-y

    authors: Mooranian A,Negrulj R,Al-Salami H

    更新日期:2016-05-01 00:00:00

  • Trimethyl chitosan-cysteine nanoparticles for systemic delivery of TNF-α siRNA via oral and intraperitoneal routes.

    abstract:PURPOSE:The lack of effective delivery vehicles impedes in vivo applications of siRNA. The trimethyl chitosan-cysteine (TC) nanoparticles (NPs) were developed for in vivo delivery of tumor necrosis factor α (TNF-α) siRNA via oral gavage and intraperitoneal injection. METHODS:The nanoparticles formulated from TC conjug...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-013-1086-4

    authors: He C,Yin L,Tang C,Yin C

    更新日期:2013-10-01 00:00:00

  • In vitro and in vivo properties of recombinant human serum albumin from Pichia pastoris purified by a method of short processing time.

    abstract:PURPOSE:Recombinant human serum albumin (rHSA), secreted by a Pichia pastoris expression system, was purified by a fast and efficient method, the essential feature of which is strong but reversible binding of the protein to Blue Sepharose. The structural characteristics, stability, and ligand-binding properties of the ...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1013391001141

    authors: Watanabe H,Yamasaki K,Kragh-Hansen U,Tanase S,Harada K,Suenaga A,Otagiri M

    更新日期:2001-12-01 00:00:00

  • Intra- and inter-subject variabilities of CGP 33101 after replicate single oral doses of two 200-mg tablets and 400-mg suspension.

    abstract:PURPOSE:The purpose of this study was to use a replicate designed trial to assess the overall, intra- and inter-subject variabilities in pharmacokinetic parameters of CGP 33101 after oral administration of tablets relative to that of powder suspended in water, and to determine the relative proportion of the intra-subje...

    journal_title:Pharmaceutical research

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1023/a:1016275402723

    authors: Cheung WK,Kianifard F,Wong A,Mathieu J,Cook T,John V,Redalieu E,Chan K

    更新日期:1995-12-01 00:00:00

  • Predicting skin permeability.

    abstract::Published permeability coefficient (Kp) data for the transport of a large group of compounds through mammalian epidermis were analyzed by a simple model based upon permeant size [molecular volume (MV) or molecular weight (MW)] and octanol/water partition coefficient (Koct). The analysis presented is a facile means to ...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1015810312465

    authors: Potts RO,Guy RH

    更新日期:1992-05-01 00:00:00

  • In vivo evaluation of a colon-specific drug delivery system: an absorption study of theophylline from capsules coated with azo polymers in rats.

    abstract::Azo polymers based upon 2-hydroxyethyl methacrylate, methyl methacrylate, and methacrylic acid, and containing N,N'-bis [(methacryloyloxyethyl)oxy(carbonylamino)]azobenzene as azo aromatic agent were evaluated in vivo as coating for colon-specific drug delivery. The gastrointestinal absorption of theophylline from cap...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1016283027139

    authors: Van den Mooter G,Samyn C,Kinget R

    更新日期:1995-02-01 00:00:00

  • Utilization of an amorphous form of a water-soluble GPIIb/IIIa antagonist for controlled release from biodegradable microspheres.

    abstract:PURPOSE:We prepared injectable microspheres for controlled release of TAK-029, a water-soluble GPIIb/IIIa antagonist and discussed the characteristics of controlled release from microspheres. METHODS:Copoly(dl-lactic/glycolic)acid (PLGA) microspheres were used for controlled release of TAK-029 [4-(4-amidinobenzoylglyc...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1012190304074

    authors: Takada S,Kurokawa T,Miyazaki K,Iwasa S,Ogawa Y

    更新日期:1997-09-01 00:00:00

  • Biomaterial-based vaccine induces regression of established intracranial glioma in rats.

    abstract:PURPOSE:The prognosis for glioma patients is poor, and development of new treatments is critical. Previously, we engineered polymer-based vaccines that control GM-CSF, CpG-oligonucleotide, and tumor-lysate presentation to regulate immune cell trafficking and activation, which promoted potent immune responses against pe...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-010-0361-x

    authors: Ali OA,Doherty E,Bell WJ,Fradet T,Hudak J,Laliberte MT,Mooney DJ,Emerich DF

    更新日期:2011-05-01 00:00:00

  • Enhanced bioavailability of cefoxitin using palmitoyl L-carnitine. I. Enhancer activity in different intestinal regions.

    abstract::The conditions under which the absorption enhancer palmitoyl L-carnitine chloride (PCC) improved the bioavailability of the poorly absorbed antibiotic cefoxitin throughout the rat intestine has been studied. Cefoxitin alone was appreciably absorbed only in the duodenum (31% vs less than 7% elsewhere). PCC solutions (3...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1018977021183

    authors: Sutton SC,LeCluyse EL,Cammack L,Fix JA

    更新日期:1992-02-01 00:00:00

  • Biomimetic metabolism of artelinic acid by chemical cytochrome P-450 model systems.

    abstract:PURPOSE:To study the reaction of artelinic acid with chemical model systems of cytochrome P-450 as a means of obtaining authentic samples of the putative metabolites necessary for identification of the mammalian metabolites of artelinic acid. METHODS:Artelinic acid was reacted with different organic complexes of iron(...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1012185124972

    authors: Idowu OR,Lin AJ,Grace JM,Peggins JO

    更新日期:1997-10-01 00:00:00

  • Analysis of a nanocrystalline polymer dispersion of ebselen using solid-state NMR, Raman microscopy, and powder X-ray diffraction.

    abstract:PURPOSE:Nanocrystalline drug-polymer dispersions are of significant interest in pharmaceutical delivery. The purpose of this work is to demonstrate the applicability of methods based on two-dimensional (2D) and multinuclear solid-state NMR (SSNMR) to a novel nanocrystalline pharmaceutical dispersion of ebselen with pol...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-012-0713-9

    authors: Vogt FG,Williams GR

    更新日期:2012-07-01 00:00:00

  • Pharmacokinetics and pharmacodynamics of PEGylated IFN-beta 1a following subcutaneous administration in monkeys.

    abstract:PURPOSE:To characterize the pharmacokinetic/pharmacodynamic (PK/PD) properties of a new polyethylene glycol (PEG) conjugate formulation of interferon (IFN)-beta la following subcutaneous (SC) administration in monkeys. METHODS:Single SC injections of 0.3, 1, and 3 million international units (MIU)/kg of PEG-IFN-beta 1...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-004-9009-z

    authors: Mager DE,Neuteboom B,Jusko WJ

    更新日期:2005-01-01 00:00:00

  • Microbial metabolism studies of the antimalarial drug arteether.

    abstract::Microbial metabolism studies of the antimalarial drug arteether (1) have shown that arteether is metabolized by a number of microorganisms. Large-scale fermentation with Aspergillus niger (ATCC 10549) and Nocardia corallina (ATCC 19070) have resulted in the isolation of four microbial metabolites which have been chara...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1023/a:1015845306124

    authors: Lee IS,ElSohly HN,Hufford CD

    更新日期:1990-02-01 00:00:00

  • Pharmacokinetic significance of renal OAT3 (SLC22A8) for anionic drug elimination in patients with mesangial proliferative glomerulonephritis.

    abstract:PURPOSE:Our previous studies showed that the mRNA level of human organic anion transporter (hOAT) 3 in the kidney was correlated with the rate of elimination of an anionic antibiotic cefazolin. However, the correlation coefficient was not so high. In the present study, therefore, we enrolled more patients to examine wh...

    journal_title:Pharmaceutical research

    pub_type: 杂志文章

    doi:10.1007/s11095-005-8383-5

    authors: Sakurai Y,Motohashi H,Ogasawara K,Terada T,Masuda S,Katsura T,Mori N,Matsuura M,Doi T,Fukatsu A,Inui K

    更新日期:2005-12-01 00:00:00