Abstract:
:In this study the intestinal degradation and absorption of a synthetic pentapeptide, metkephamid, were investigated in the rat by determination of its wall permeabilities in the small and large intestine and the extent and mechanism of its intestinal degradation. The peptide was metabolized in the gut wall through contact with membrane-bound enzymes in the brush border membrane. The extent of metabolic inactivation depended on the intestinal segment investigated and decreased in the axial direction. No metabolism was found in the colon. The dimensionless wall permeabilities (Pw*), determined by single-pass perfusion, were also site dependent. Pw* was highest in the ileum [1.91 +/- 0.24, (SE); n = 4], followed by the jejunum (1.64 +/- 0.34; n = 4) and the colon (0.67 +/- 0.38; n = 4). Based on the permeability data alone and under the assumption of no presystemic metabolism, complete bioavailability would be predicted for metkephamid. However, following oral administration, the mean absolute bioavailability was only 0.22 +/- 0.065% (n = 3), indicating the overall dominance of degradation in the absorption process. Thus future strategies in oral peptide delivery should focus on increasing the stability of the peptide in the intestine by modifying the peptide structure and/or delivering the compound to an intestinal segment showing little or no enzymatic degradation.
journal_name
Pharm Resjournal_title
Pharmaceutical researchauthors
Langguth P,Merkle HP,Amidon GLdoi
10.1023/a:1018962415287subject
Has Abstractpub_date
1994-04-01 00:00:00pages
528-35issue
4eissn
0724-8741issn
1573-904Xjournal_volume
11pub_type
杂志文章abstract::Apigenin, a naturally occurring plant flavone, abundantly present in common fruits and vegetables, is recognized as a bioactive flavonoid shown to possess anti-inflammatory, antioxidant and anticancer properties. Epidemiologic studies suggest that a diet rich in flavones is related to a decreased risk of certain cance...
journal_title:Pharmaceutical research
pub_type: 杂志文章,评审
doi:10.1007/s11095-010-0089-7
更新日期:2010-06-01 00:00:00
abstract:PURPOSE:Modulation of 5-HT3 receptor in the central nervous system (CNS) is a promising approach for treatment of neuropathic pain. The goal was to evaluate the role of P-glycoprotein (Pgp) in limiting exposure of different parts of the CNS to ondansetron (5-HT3 receptor antagonist) using wild-type and genetic knockout...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-020-02929-2
更新日期:2020-09-28 00:00:00
abstract:PURPOSE:To assess the efficacy of lipid-protein-sugar particles (LPSPs) in providing prolonged duration local anesthesia by percutaneous injection. METHODS:Bupivacaine-containing LPSPs were characterized and optimized in vitro. Male Sprague-Dawley rats were given sciatic nerve blocks with bupivacaine-containing LPSPs....
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1026470831256
更新日期:2000-10-01 00:00:00
abstract:PURPOSE:A plasmid-based gene expression system was complexed with protective, interactive, and non-condensing (PINC) polymer system and administered with Medi-Jector, a needle-free injection device (NFID), to achieve high and sustained levels of antigen-specific antibodies in blood circulation. METHODS:Human growth ho...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1018834305079
更新日期:1999-06-01 00:00:00
abstract::Interogan variation in tissue distribution of weakly basic drugs such as quinidine, propranolol, and imipramine was investigated as a function of binding to phosphatidylserine (PhS) in tissues. Tissue distributions of these drugs were determined using 10 different tissues at a steady-state plasma concentration and wer...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1015935031933
更新日期:1990-10-01 00:00:00
abstract:PURPOSE:In vitro and in vivo permeation studies were conducted to evaluate the characteristic of percutaneous administration of high hydrophilic drug L-carnitine (LC) by Functional MicroArray (FMA) painless intradermal delivery system. METHODS:In vitro study was designed to assess the effects of various skins, donor c...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-010-0109-7
更新日期:2011-01-01 00:00:00
abstract:PURPOSE:The purpose of this study is to show how disaccharides differ in their ability to protect lyophilized β-galactosidase from enzymatic activity loss and secondary structure changes during storage. METHODS:β-galactosidase was lyophilized with trehalose, sucrose, cellobiose or melibiose at 2:1, 20:1 and 40:1 excip...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-010-0300-x
更新日期:2011-03-01 00:00:00
abstract:PURPOSE:To analyze the effects of chemical enhancers and iontophoresis on the buccal transmucosal delivery of lidocaine and nicotine. METHODS:Porcine oral mucosal samples were pretreated with chemical enhancers before conducting 8-hr Franz diffusion-cell experiments. In studies addressing the influence of iontophoresi...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-011-0636-x
更新日期:2012-04-01 00:00:00
abstract::Nasal sprays containing different concentrations of the somatostatin analogue octreotide and sodium tauro-24,25-dihydrofusidate (STDHF) as an absorption promoter were evaluated in two consecutive pharmacokinetic studies in healthy volunteers to characterize their bioavailability and local tolerability. The concentrati...
journal_title:Pharmaceutical research
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1023/a:1018927710280
更新日期:1992-01-01 00:00:00
abstract:PURPOSE:To evaluate the influence of the main biopharmaceutical factors on the viability of a new probiotic yeast strain, using dynamic in vitro systems simulating human gastric/small intestinal (TIM) and large intestinal (ARCOL) environments. METHODS:The viability of Saccharomyces cerevisiae CNCM I-3856 throughout th...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-011-0620-5
更新日期:2012-06-01 00:00:00
abstract::Physiologically-based pharmacokinetic (PBPK) models explicitly incorporate tissue-specific blood flows, partition coefficients, and metabolic processes. Since PBPK models are derived using physiologic parameters and interactions of the compound with tissue components, these models are considered to be "bottom up" as o...
journal_title:Pharmaceutical research
pub_type: 杂志文章,评审
doi:10.1007/s11095-016-2089-8
更新日期:2017-03-01 00:00:00
abstract:PURPOSE:The purpose of the study was to examine the suitability of using laser diffraction to measure the fine particle fraction (FPF) of drugs emitted from carrier-free dry powder aerosol formulations. MATERIALS AND METHODS:Particle size distribution of terbutaline sulphate from Bricanyl Turbohaler, which contained l...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-006-9056-8
更新日期:2006-09-01 00:00:00
abstract:PURPOSE:To develop a non-viral gene delivery system in the form of an oil-in-water (o/w) lipid emulsion. METHOD:Cationic lipid emulsions were formulated with soybean oil, 1,2-dioleoyl-sn-glycero-3-trimethylammonium-propane (DOTAP) as a cationic emulsifier and other co-emulsifiers. The physical characteristics of the l...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1007553106681
更新日期:2000-03-01 00:00:00
abstract:PURPOSE:In vitro in vivo correlation (IVIVC) is a biopharmaceutical tool recommended for use in formulation development. When validated, IVIVC can be used to set dissolution limits and, based on the dissolution limits, as a surrogate for an in vivo study. The purpose of this paper is to study the various methods used t...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-014-1349-8
更新日期:2014-09-01 00:00:00
abstract::Diltiazem (DTZ) is a calcium channel blocker widely used in the treatment of angina and hypertension. DTZ undergoes extensive metabolism yielding several metabolites, some of which are active like N-desmethyldiltiazem (MA), desacetyldiltiazem (M1) and N-desmethyl,desacetyldiltiazem (M2). Due to the nature of its biotr...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1016226601988
更新日期:1995-04-01 00:00:00
abstract::One of the authors has his name incorrectly indexed in PubMed and SpringerLink as "Laird Forrest M" (last name "Laird Forrest"). His name should index as "Forrest M. Laird" with last name as "Forrest". ...
journal_title:Pharmaceutical research
pub_type: 杂志文章,已发布勘误
doi:10.1007/s11095-018-2463-9
更新日期:2018-07-25 00:00:00
abstract::New generation vaccines, particularly those based on recombinant proteins and DNA, are likely to be less reactogenic than traditional vaccines but are also less immunogenic. Therefore, there is an urgent need for the development of new and improved vaccine adjuvants. Adjuvants can be broadly separated into two classes...
journal_title:Pharmaceutical research
pub_type: 杂志文章,评审
doi:10.1023/a:1016104910582
更新日期:2002-06-01 00:00:00
abstract:PURPOSE:The use of dendrimers for biomedical applications has emerged with promising results. 2G-NN16 is a carbosilane dendrimer with sixteen positive charges per molecule tested to be capable to bind and release antisense oligonucleotides (ODNs) and small interference RNA (siRNA) in vitro. In spite of low cytotoxicity...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-008-9776-z
更新日期:2009-03-01 00:00:00
abstract:PURPOSE:To compare the physical stability of amorphous molecular level solid dispersions of nifedipine and felodipine, in the presence of poly(vinylpyrrolidone) (PVP) and small amounts of moisture. METHODS:Thin amorphous films of nifedipine and felodipine and amorphous molecular level solid dispersions with PVP were s...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-007-9420-3
更新日期:2008-03-01 00:00:00
abstract::RNA interference (RNAi) strategies include double-stranded RNA (dsRNA), small interfering RNA (siRNA), short hairpin RNA (shRNA), and microRNA (miRNA). As this is a highly specific technique, efforts have been made to utilize RNAi towards potential knock down of disease-causing genes in a targeted fashion. RNAi has th...
journal_title:Pharmaceutical research
pub_type: 杂志文章,评审
doi:10.1007/s11095-011-0608-1
更新日期:2011-12-01 00:00:00
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
更新日期:2010-05-01 00:00:00
abstract::Since ancient times, natural products, herbs and spices have been used for preventing several diseases, including cancer. The term chemoprevention was coined in the late 1970s and referred to the prevention of cancer by selective use of phytochemicals or their analogs. The field utilizes experimental carcinogenesis mo...
journal_title:Pharmaceutical research
pub_type: 历史文章,杂志文章,评审
doi:10.1007/s11095-010-0085-y
更新日期:2010-06-01 00:00:00
abstract:PURPOSE:To develop a novel bioadhesive polymer that protects peptide drugs from luminal degradation by aminopeptidase N and to evaluate the system in vitro on porcine mucosa. METHODS:EDTA was covalently bound to chitosan in order to combine the bioadhesive properties of the polymer with the well known capacity of EDTA...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1012108118670
更新日期:1997-07-01 00:00:00
abstract:PURPOSE:To synthesize a trifluorinated bile acid that can be used for (19)F magnetic resonance imaging (MRI) of bile acid enterohepatic circulation, characterize its in vitro transporter affinity, stability, and (19)F-MRI signal, and assess its ability to concentrate in the gallbladder of C57BL/6 mice. METHODS:Target ...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-012-0963-6
更新日期:2013-05-01 00:00:00
abstract:PURPOSE:The fate of inhaled salmon calcitonin (sCT) at the respiratory epithelial barrier was studied with particular emphasis on enzymatic degradation by trypsin, chymotrypsin, and neutrophil elastase. METHODS:Degradation of sCT was assessed by HPLC in cell homogenate, supernatant and intact monolayers of human respi...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-011-0553-z
更新日期:2012-01-01 00:00:00
abstract:PURPOSE:Delivery of apoptosis-inducing compounds to hepatic stellate cells (HSC) may be an effective strategy to reverse liver fibrosis. The aim of this study was therefore to examine the selective targeting of the apoptosis-inducing drug 15-deoxy-delta12,14-prostaglandin J2 (15dPGJ2) with two different HSC-carriers: h...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-006-9175-2
更新日期:2007-03-01 00:00:00
abstract:PURPOSE:For determination of the transit time through various parts of the gastrointestinal (GI) tract, we developed a method that provides the location of disintegration and drug release. This method involves GI magnetomarkergraphy (GIMG) using a 129-channel Shimadzu vector biomagnetic measurement system (BMS). METHO...
journal_title:Pharmaceutical research
pub_type: 临床试验,杂志文章
doi:10.1023/a:1007561129221
更新日期:2000-02-01 00:00:00
abstract::A physical-chemical analysis of the extent of sorption of water by tablets containing superdisintegrants was carried out following the aqueous film coating of formulated tablets. Characterization of the uncoated and coated tablet properties was conducted using thermogravimetric analysis, differential scanning calorime...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1018932705370
更新日期:1993-08-01 00:00:00
abstract:PURPOSE:Monocarboxylate transporter (MCT) inhibition represents a potential treatment strategy for γ-hydroxybutyric acid (GHB) overdose by blocking its renal reabsorption in the kidney. This study further evaluated the effects of a novel, highly potent MCT inhibitor, AR-C155858, on GHB toxicokinetics/toxicodynamics (TK...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-014-1583-0
更新日期:2015-06-01 00:00:00
abstract::We investigated the effects of increased concentrations of the solutes, salicylic acid, benzoic acid, and o-, m-, and p-methoxy benzoic acids, on the anisotropic properties of a liquid crystal solvent. The lamellar liquid crystal was composed of 37% polyoxyethylene (20) isohexadecyl ether in aqueous buffer of pH 1. Ph...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1018920118631
更新日期:1993-05-01 00:00:00