Vitellogenesis in Manduca sexta
Mem. Inst. Oswaldo Cruz
;
82(supl.3): 83-88, 1987. ilus, tab
Article
in English
| LILACS
| ID: lil-623743
ABSTRACT
Eggs of Manduca sexta contain four well-characterized protein derived from hemolymph vitellogenin and lipophorin (very high density lipoproteins); microvitellogenin, a 26,000 dalton female-specific protein lacking lipid and carbohydrate, and insecticyanin, a blue biliprotein composed of four identical 22,000 dalton subunits. In addition, eggs contain a large store of triacyl glycerols. It has been shown that vitellogenin and lipophorin are actively taken up by follicles in vitro. The lipid components of these two proteins together account for only 10% of egg lipid. The follicle actively sequesters intact high density lipophorin, which, inside the oocyte, is stripped of much of its neutral lipid and two molecules of apolipophorin III. On the other hand, low density lipophorin donates diacylglycerol to the oocyte without its protein components being sequestered. Most of the egg lipid is transported from the fat body by a shuttle system involving low density lipophorin.
Full text:
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Index:
LILACS (Americas)
Main subject:
Manduca
Limits:
Animals
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
1987
Type:
Article
/
Congress and conference
Affiliation country:
Kenya
/
United States
Institution/Affiliation country:
International Centre for Insect Physiology and Exology/KE
/
The University of Arizona/US
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