Document Detail

Uptake and interconversion of fluorescent lipid analogs in the protozoan parasite, Perkinsus marinus, of the oyster, Crassostrea virginica.
MedLine Citation:
PMID:  11038307     Owner:  NLM     Status:  MEDLINE    
Uptake, distribution, and interconversion of fluorescent lipid analogs (phosphatidylcholine, PC; cholesteryl ester, CHE; phosphatidylethanolamine, PE; palmitic acid, C16; sphingomyelin, SM) by the two life stages, meront and prezoosporangium, of the oyster protozoan parasite, Perkinsus marinus, were investigated. Class composition of these two life stages and lipid contents in meront cells were also examined. Both meronts and prezoosporangia incorporated and modified fluorescent lipids from the medium, but their metabolic modes differ to some extent. Results revealed that among the tested analogs, neutral lipid components (CHE and C16) were incorporated to a greater degree than the phospholipids (PC, PE, and SM). HPLC analysis of meront lipids showed that while the majority of the incorporated PC, CHE, and PE remained as parent compounds, most of the incorporated C16 was in triacylglycerol (TAG) and SM was in ceramide and free fatty acids. The cellular distribution of fluorescent labels varied with lipid analogs and the extent of their metabolism by the parasite. Fluorescence distribution was primarily in cytoplasmic lipid droplets of both life stages after 24 h incubation with PC. After 24 h incubation with SM, fluorescence appeared in the membrane and cytosol. Total lipid contents in meront cultures increased during proliferation and TAG accounted for most of the increased total lipids. Since total lipid content per meront cell did not increase until the day of culture termination, the lipid increase in the meront culture was mainly a result of increased cell numbers. Both life stages contain relatively high levels of phospholipids, 53.8% in 8-day-old meronts and 39.4% in prezoosporangia. PC was the predominant phospholipid.
F E Chu; P Soudant; A K Volety; Y Huang
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Experimental parasitology     Volume:  95     ISSN:  0014-4894     ISO Abbreviation:  Exp. Parasitol.     Publication Date:  2000 Aug 
Date Detail:
Created Date:  2000-10-24     Completed Date:  2000-10-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370713     Medline TA:  Exp Parasitol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  240-51     Citation Subset:  IM    
Copyright Information:
Copyright 2000 Academic Press.
Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, Virginia 23062, USA.
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MeSH Terms
Apicomplexa / chemistry,  growth & development,  metabolism*
Cholesterol / metabolism
Chromatography, High Pressure Liquid
Fluorescent Dyes / metabolism*
Lipid Metabolism*
Lipids / chemistry
Ostreidae / parasitology*
Phospholipids / metabolism
Triglycerides / metabolism
Reg. No./Substance:
0/Fluorescent Dyes; 0/Lipids; 0/Phospholipids; 0/Triglycerides; 57-88-5/Cholesterol

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