Document Detail


Giant liposomes as delivery system for ecophysiological studies in copepods.
MedLine Citation:
PMID:  16481569     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Giant liposomes are proposed as a potential delivery system in marine copepods, the dominant constituent of the zooplankton. Liposomes were prepared in the same size range as the food ingested by copepods (mean diameter of about 7 microm). The encapsulation of a hydrophilic and high molecular mass fluorescent compound, fluorescein isothiocyanate-dextran (FitcDx), within the liposomes provided a means of verifying copepod ingestion when viewed with the confocal laser-scanning microscope. Females of the calanoid copepod Temora stylifera were fed with FitcDx-encapsulated liposomes alone or mixed with the dinoflagellate alga Prorocentrum minimum. Control copepods were incubated with the P. minimum diet alone. Egg production rates, percentage egg-hatching success and number of faecal pellets produced were evaluated after 24 h and 48 h of feeding. Epifluorescence of copepod gut and faecal pellets indicated that the liposomes were actively ingested by T. stylifera in both experimental food conditions, with or without the dinoflagellate diet. Ingestion rates calculated using 3H-labelled liposomes indicated that females ingested more liposomes when P. minimum was added to the solution (16% vs 7.6% of uptake). When liposomes were supplied together with the algal diet, egg production rate, egg-hatching success and faecal pellet production were as high as those observed for the control diet. By contrary, egg production and hatching success were very low with a diet of liposomes alone and faecal pellet production was similar to that recorded in starved females. This results suggest that liposomes alone did not add any nutritive value to the diet, making them a good candidate as inert carriers to study the nutrient requirements or biological activity of different compounds. In particular, such liposomes are proposed as carriers for diatom-derived polyunsaturated aldehydes, which are known to impair copepod embryo viability. Other potential applications of liposomes as a delivery system of drugs and nutrients in copepod mass cultivation, or as carriers of pollutants to study copepod physiology in ecotoxicological experiments, are also discussed.
Authors:
Isabella Buttino; Giuseppe De Rosa; Ylenia Carotenuto; Adrianna Ianora; Angelo Fontana; Fabiana Quaglia; Maria Immacolata La Rotonda; Antonio Miralto
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  209     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-02-16     Completed Date:  2006-05-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  801-9     Citation Subset:  IM    
Affiliation:
Stazione Zoologica Anton Dohrn Villa Comunale, 80121 Napoli, Italy. buttino@szn.it
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MeSH Terms
Descriptor/Qualifier:
Animals
Copepoda / metabolism*
Diet
Feces
Feeding Behavior
Female
Liposomes* / chemistry
Oviposition
Time Factors
Chemical
Reg. No./Substance:
0/Liposomes

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


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