Astrocytes synthesize and secrete the lipophilic ligand carrier apolipoprotein D.

Abstract:

:Expression of the lipophilic ligand transporter, apolipoprotein D (apoD) by primary astrocyte cultures derived from neonatal mouse brain was investigated. Western blot analysis of cell lysates and media showed that apoD is constitutively secreted by astrocytes with little intracellular storage. The secreted apoD floated primarily at density 1.063-1.21 g ml-1 upon sequential ultracentrifugation indicating its association with lipids. Treatment of astrocytes with the carboxylic ionophore, monensin, resulted in intracellular retention and decreased secretion of apoD that was of slightly reduced M(r). Progesterone, a steroid hormone that binds to apoD with high affinity (10(-6) mol l-1) and the oxysterol, 25-hydroxycholesterol which is a potent regulator of cellular cholesterol homeostasis in mammalian cells, differentially stimulated apoD, but not apoE secretion. These results show that astrocytes synthesize and constitutively secrete apoD and suggest a physiologic role for this lipocalin in cholesterol metabolism in the nervous system.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Patel SC,Asotra K,Patel YC,McConathy WJ,Patel RC,Suresh S

doi

10.1097/00001756-199503000-00017

subject

Has Abstract

pub_date

1995-03-07 00:00:00

pages

653-7

issue

4

eissn

0959-4965

issn

1473-558X

journal_volume

6

pub_type

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