Document Detail


Relative acylglycerol acyltransferase activities in homogenates of enzymically dispersed rat jejunal villus and crypt cells.
MedLine Citation:
PMID:  7055595     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The relative acyltransferase activities were compared in homogenates of rat jejunal villus and crypt cells isolated by differential scraping and hyaluronidase dispersion. The contributions of the monoacylglycerol and phosphatidic acid pathways to the higher acylglycerol and phospholipid biosynthesis were assessed using 2-oleoyl-sn-[3H] glycerol and [I-14C] palmitic acid as tracers. The stereochemical course of the diacylglycerol biosynthesis was determined by stereospecific analysis. Using 2-oleoyl-sn-glycerol as a tracer, the villus cells exhibited for times higher diacylglycerol and 19 times higher triacylglycerol biosynthesis than crypt cells on an equivalent protein basis. Furthermore, while the villus cell homogenates yielded a preponderance (75%) of the 1, 2-diacyl-sn-glycerols, the crypt cell homogenates formed essentially racemic proportions of 1, 2- and 2,3-diacyl-sn-glycerols. Both villus and crypt cell homogenates exhibited comparable acyl acceptor and acyl donor concentration dependence and the same cofactor requirements. It is unlikely that these acyltransferase activities in the crypt cell preparation are due to contamination with the villus cells, because then more comparable proportions of the enantiomeric diacylglycerols and triacylglycerols would have been anticipated. It is concluded that the crypt cells possess intrinsic monoacylglycerol and to a much lesser extent diacylglycerol acyltransferase activities, which are acquired prior to the development of a distinct brush border and which probably do not require dietary stimulus for induction.
Authors:
A G Hoffman; A Kuksis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  710     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  1982 Jan 
Date Detail:
Created Date:  1982-04-12     Completed Date:  1982-04-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  53-62     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Acyltransferases / metabolism*
Animals
Cell Membrane / enzymology*
Chromatography, Thin Layer
Diacylglycerol O-Acyltransferase
Glycerides / isolation & purification
Jejunum / cytology,  enzymology*
Kinetics
Male
Microvilli / enzymology*
Rats
Rats, Inbred Strains
Tritium
Chemical
Reg. No./Substance:
0/Glycerides; 10028-17-8/Tritium; EC 2.3.-/Acyltransferases; EC 2.3.1.20/Diacylglycerol O-Acyltransferase; EC 2.3.1.22/2-acylglycerol O-acyltransferase

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


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