Document Detail


Trans-placental transport and metabolism of carbacyclin by perfused human placental in vitro.
MedLine Citation:
PMID:  2655009     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
When carbacyclin (5E-6a-carba-prostaglandin I2) was added to the maternal afferent circulation of in vitro perfused placentae from normal term pregnancies, relatively little carbacyclin was found in either the maternal or fetal efferent circulations. When carbacyclin was added to the perfusate at 1.0 microM, the peak level in the maternal effluent was only 0.06 microM and in the fetal effluent, 0.026 microM. When infused at 10 microM, 0.77 microM carbacyclin was measured in the maternal effluent and 0.13 in the fetal effluent. These findings demonstrate that carbacyclin is transferred across the placenta from the maternal side to the fetal, but that the net transfer is small. The assay procedure employed HPLC resolution, followed by capillary gas chromatography and selected ion monitoring using PGB as an internal standard. The low levels of carbacyclin detected in the effluents did not result from poor recovery in the analyses. When carbacyclin was added to maternal or fetal effluents at 1 microM, the recovery averaged 85.4 +/- 14.1% (SD); at 10 microM recovery averaged 97.3 +/- 4.2%. Much of the loss of carbacyclin on passage through placental circulation resulted from metabolism. Extracts of both fetal and maternal effluents from placenta perfused with carbacyclin contained a component which on reverse phase HPLC appeared less polar than carbacyclin. When analyzed by GC/MS as the methyl ester-trimethylsilyl ether, this component had a mass spectrum expected for 15-dehydro-carbacyclin. When the presumed metabolite was further converted to the methoxime, the mass spectrum was identical to published spectra for that derivative of 15-dehydro-carbacyclin. When extracts of fetal effluents were analyzed for 15-dehydro-carbacyclin metabolite as well as carbacyclin, it appeared that the metabolite accounted for the majority of the carbacyclin recovered. Most of the metabolite was apparently not formed in the fetal circulation, since when carbacyclin was added to the fetal afferent circulation, little 15-dehydro-carbacyclin was observed in either efferent fluid, and most of the perfused carbacyclin was recovered unaltered in the fetal effluent.
Authors:
R W Walenga; D C Kuhn; M J Stuart
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Prostaglandins     Volume:  37     ISSN:  0090-6980     ISO Abbreviation:  Prostaglandins     Publication Date:  1989 Jan 
Date Detail:
Created Date:  1989-06-22     Completed Date:  1989-06-22     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0320271     Medline TA:  Prostaglandins     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  121-34     Citation Subset:  IM    
Affiliation:
Dept. of Pediatrics, St. Christopher's Hospital for Children, Temple Univ. Med. Ctr, Philadelphia, PA.
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MeSH Terms
Descriptor/Qualifier:
Biological Transport
Chromatography, Gas
Chromatography, High Pressure Liquid
Epoprostenol / analysis,  metabolism*
Female
Gas Chromatography-Mass Spectrometry
Humans
Kinetics
Mass Spectrometry
Placenta / metabolism*
Pregnancy
Prostaglandins B / analysis
Grant Support
ID/Acronym/Agency:
HD-14405/HD/NICHD NIH HHS
Chemical
Reg. No./Substance:
0/Prostaglandins B; 13367-85-6/prostaglandin B2; 35121-78-9/Epoprostenol; 69552-46-1/carboprostacyclin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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