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Lipid uptake by insect oocytes.

Abstract：

:Approximately 30-40% of the dry weight of an insect egg consists of lipid, mostly triacylglycerol (TAG). Although this lipid is essential for the energy needed by the developing embryo, little is known about the mechanism that leads to the accumulation of TAG in the insect egg. Insect oocytes can readily synthesize TAG from free fatty acids (FFAs) and glycerol, however, de novo synthesis of FAs by the oocyte is marginal. Hence, FAs have to be imported from the fat body or the diet. Insect hemolymph contains two lipoproteins that transport lipids, lipophorin and vitellogenin. Both are taken up via endocytosis by the oocyte, however, this provides only about 10% of the egg's lipid reserves. The rest is unloaded from circulating lipoprotein particles at the oocyte surface in the form of diacylglycerol (DAG), the major lipid transport form in insects, or as FFA. The mechanism of lipoprotein unloading at the oocyte surface is currently unclear. Possible roles of the lipid transfer particle (LTP), FA transporters, and lipoprotein lipase activity are discussed.

journal_name

Insect Biochem Mol Biol

journal_title

Insect biochemistry and molecular biology

authors

Ziegler R,Van Antwerpen R

doi

10.1016/j.ibmb.2006.01.014

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

264-72

issue

4

eissn

0965-1748

issn

1879-0240

pii

S0965-1748(06)00006-3

journal_volume

36

pub_type

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