Regulation of apolipoprotein E secretion in rat primary hippocampal astrocyte cultures

被引:32
作者
Cedazo-Mínguez, A
Hamker, U
Meske, V
Veh, RW
Hellweg, R
Jacobi, C
Albert, F
Cowburn, RF
Ohm, TG
机构
[1] Karolinska Inst, NOVUM, NEUROTEC, Sect Expt Geriatr,KFC, S-14186 Huddinge, Sweden
[2] Univ Klinikum Charite, Inst Anat, D-10098 Berlin, Germany
[3] Free Univ Berlin, Psychiat Klin, D-14050 Berlin, Germany
关键词
Alzheimer's disease; nerve growth factor; cAMP; protein kinase C;
D O I
10.1016/S0306-4522(01)00224-X
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Apolipoprotein E isoforms may have differential effects on a number of pathological processes underlying Alzheimer's disease. Recent studies suggest that the amount, rather than the type, of apolipoprotein E may also be an important determinant for Alzheimer's disease. Therefore, understanding the regulated synthesis of apolipoprotein E is important for determining its role in Alzheimer's disease. We show here that in rat primary hippocampal astrocyte cultures, dibutyryl-cAMP increased apolipoprotein E secretion with time in a dose-dependent manner (to 177% at 48 h) and that retinoic acid potentiated this effect (to 298% at 48 h). Dibutyryl-CAMP also gave a rapid, albeit transient, increase of apolipoprotein E mRNA expression (to 200% at 1 h). In contrast, the protein kinase C activator phorbol 12-myristate 13-acetate decreased both apolipoprotein E secretion (to 59% at 48 h) and mRNA expression (to 22% at 1 h). Phorbol 12-myristate 13-acetate also reversed the effects of dibutyryl-CAMP. Apolipoprotein E secretion was also modulated by receptor agonists for the adenylyl cyclase/CAMP pathway. Isoproterenol (50 nM, a beta -adrenoceptor agonist) enhanced, while clonidine (250 nM, an alpha2-adrenoceptor agonist) decreased, secreted apolipoprotein E. We also analysed the effects of agonists for the phospholipase C/protein kinase C pathway. Arterenol (1 muM, an alpha1-adrenoceptor agonist) and serotonin (2.5 muM) enhanced, whereas carbachol (10 muM, an acetylcholine muscarinic receptor agonist) decreased secreted apolipoprotein E. The effects of these nonselective receptor agonists were modest, probably due to effects on different signalling pathways. Arterenol also potentiated the isoproterenol-mediated increase. We also show that phorbol 12-myristate 13-acetate and dibutyryl-cAMP have opposite effects on nerve growth factor, as compared to apolipoprotein E, secretion, suggesting that the results obtained were unlikely to be due to a general effect on protein synthesis. We conclude that astrocyte apolipoprotein E production can be regulated by factors that affect CAMP intracellular concentration or activate protein kinase C. Alterations in these signalling pathways in Alzheimer's disease brain may have consequences for apolipoprotein E secretion in this disorder. (C) 2001 IBRO. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:651 / 661
页数:11
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