| H+ coupled transport of p.o. cephalosporins via dipeptide carriers in rabbit intestinal brush-border membranes: difference of transport characteristics between cefixime and cephradine. | |
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MedLine Citation:
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PMID: 3171973 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We demonstrated previously that aminocephalosporins, such as cephradine, possessing a alpha-amino group and a carboxyl group, are transported via H+/dipeptide carrier system in the intestinal brush-border membranes. The present study examined the transport characteristics of cefixime, a new p.o. cephalosporin with two carboxyl groups, by the rabbit intestinal brush-border membrane vesicles in comparison with those of cephradine. With an intravesicular pH of 7.5, apparent optimum extravesicular pH was 6.0 for cephradine uptake and more acidic (pH 4.5-5.0) for cefixime uptake. An inward H+ gradient [( pH]i = 7.5, [pH]o = 5.0) induced overshoot uptake of cefixime, and this uptake was reduced in the presence of carbonyl cyanide p-trifluoromethoxyphenylhydrazone, a protonophore. Cefixime uptake at pH 5.0 was trans-stimulated (countertransport effect) and cis-inhibited by dipeptides and aminocephalosporins but not at pH 7.5. Cephradine uptake at pH 7.5 was stimulated by the countertransport effect of dipeptide but not by cefixime. Cefixime and cephradine uptake at pH 5.0 was greatly inhibited by 4,4'-diisothiocyano-2,2'-disulfonic stilbene. These findings indicate that cefixime is transported by an inward H+ gradient via dipeptide carrier only in an acidic pH region, whereas cephradine is transported via dipeptide carrier in both neutral and acidic pH regions, suggesting the existence of multiple transport systems for dipeptides; a neutral pH preferring system (Type I) and an acidic pH preferring system (Type II). |
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Authors:
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K Inui; T Okano; H Maegawa; M Kato; M Takano; R Hori |
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Publication Detail:
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Type: Comparative Study; In Vitro; Journal Article |
Journal Detail:
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Title: The Journal of pharmacology and experimental therapeutics Volume: 247 ISSN: 0022-3565 ISO Abbreviation: J. Pharmacol. Exp. Ther. Publication Date: 1988 Oct |
Date Detail:
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Created Date: 1988-11-18 Completed Date: 1988-11-18 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0376362 Medline TA: J Pharmacol Exp Ther Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 235-41 Citation Subset: IM |
Affiliation:
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Department of Pharmacy, Kyoto University Hospital, Faculty of Medicine, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid 4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid / analogs & derivatives, pharmacology Administration, Oral Animals Biological Transport Cefixime Cefotaxime / analogs & derivatives*, pharmacokinetics Cephalosporins / pharmacokinetics* Cephradine / pharmacokinetics* Dipeptides / pharmacokinetics* Hydrogen-Ion Concentration Intestines / metabolism* Male Microvilli / metabolism Rabbits Structure-Activity Relationship |
| Chemical | |
Reg. No./Substance:
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0/Cephalosporins; 0/Dipeptides; 27816-59-7/4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid; 38821-53-3/Cephradine; 53005-05-3/4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid; 63527-52-6/Cefotaxime; 79350-37-1/Cefixime |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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