Lipoprotein mediated lipid uptake in oocytes of polychaetes (Annelida)
Lipoprotein mediated lipid uptake in oocytes of polychaetes (Annelida)
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脂蛋白介导的多毛类卵母细胞的脂质摄取(环节动物)
DOI:
10.1007/s00441-009-0817-7
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发表时间:
2009
影响因子:
3.6
通讯作者:
U. Hoeger
中科院分区:
文献类型:
--
作者:
S. Schenk;U. Hoeger
The uptake of the 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate (DiI)-labeled sex-unspecificNereislipoprotein was investigated in oocytes of the nereidid polychaetesNereis virensandPlatynereis dumerilii. The fluorescence label was first observed in endocytic vesicles (<1 μm diameter), which later fused to larger vesicles (2–3 μm); these were finally incorporated into existing unlabeled yolk granules (5–6 μm). InPlatynereisoocytes, the fusion of endocytic vesicles was delayed in oocytes at their final stage of development compared with those at an early stage of development. Lipoprotein double-labeled with fluorescein isothiocyanate (FITC) and DiI revealed that both the protein and the lipid moiety remained co-localized during incorporation into the yolk granules of the oocyte. No labeling of the cytoplasmic lipid droplets was observed. InN. virens, unlabeledNereislipoprotein was effective as a competitive inhibitor of DiI-labeledNereislipoprotein. Ligand blot experiments demonstrated the presence of a lipoprotein receptor with an apparent molecular mass of 120 kDa, which is different from that of the known yolk protein receptor. This indicates the presence, in the polychaete oocyte, of two distinct receptors mediating yolk protein and lipoprotein uptake, respectively. Thus, the sex-unspecific lipoprotein contributes to the lipid supply of the growing oocyte in addition to the known uptake of the yolk-protein-associated lipids. The absence of label in the cytoplasmic lipid droplets, even after prolonged incubation with labeled lipoprotein, suggests that these lipids arise either by the breakdown and resynthesis of lipoprotein-derived lipids and/or byde novosynthesis within the oocyte.
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DOI:
--
发表时间:
1990
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Tsuchida,K;Wells,MA
通讯作者:
Wells,MA
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
F. Fontaine;M. Gevaert;M. Porchet
通讯作者:
M. Porchet
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
F. Fontaine;M. Gevaert;M. Porchet
通讯作者:
M. Porchet
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
A. Fischer;H. Rabien
通讯作者:
H. Rabien
DOI:
--
发表时间:
1989
期刊:
影响因子:
--
作者:
A. Röhrkasten;H. Ferenz;Beate Buschmann‐Gebhardt;J. Hafer
通讯作者:
J. Hafer