Cholesterol controls lipid endocytosis through Rab11

Miwa Takahashi, Motohide Murate, Mitsunori Fukuda, Satoshi B. Sato, Akinori Ohta, Toshihide Kobayashi

研究成果: Article査読

50 被引用数 (Scopus)

抄録

Cellular cholesterol increases when cells reach confluency in Chinese hamster ovary (CHO) cells. We examined the endocytosis of several lipid probes in subconfluent and confluent CHO cells. In subconfluent cells, fluorescent lipid probes including poly(ethylene glycol)derivatized cholesterol, 22-(N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino)-23,24-bisnor-5-cholen-3β- ol, and fluorescent sphingomyelin analogs were internalized to pericentriolar recycling endosomes. This accumulation was not observed in confluent cells. Internalization of fluorescent lactosylceramide was not affected by cell confluency, suggesting that the endocytosis of specific membrane components is affected by cell confluency. The crucial role of cellular cholesterol in cell confluency-dependent endocytosis was suggested by the observation that the fluorescent sphingomyelin was transported to recycling endosomes when cellular cholesterol was depleted in confluent cells. To understand the molecular mechanism(s) of cell confluency- and cholesterol-dependent endocytosis, we examined intracellular distribution of rab small GTPases. Our results indicate that rab11 but not rab4, altered intracellular localization in a cell confluency-associated manner, and this alteration was dependent on cell cholesterol. In addition, the expression of a constitutive active mutant of rab11 changed the endocytic route of lipid probes from early to recycling endosomes. These results thus suggest that cholesterol controls endocytic routes of a subset of membrane lipids through rab11.

本文言語English
ページ(範囲)2667-2677
ページ数11
ジャーナルMolecular biology of the cell
18
7
DOI
出版ステータスPublished - 2007 7

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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