Saturation of, and competition for entry into, the apical secretory pathway.

Saturation of, and competition for entry into, the apical secretory pathway.
复制标题

顶端分泌途径的饱和和进入的竞争。

DOI:
10.1073/pnas.97.7.3248
复制
发表时间:
2000
影响因子:
11.1
通讯作者:
Rodriguez-Boulan,E
Rodriguez-Boulan,E
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Marmorstein,AD;Csaky,KG;Baffi,J;Lam,L;Rahaal,F;Rodriguez-Boulan,E

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To investigate mechanisms of apical sorting in the secretory pathway of epithelial cells, we expressed varying amounts of the 165 amino acid isoform of vascular endothelial growth factor (VEGF165) and transforming growth factor β1 (TGF-β1) via replication defective adenoviruses. Apical sorting of both proteins was efficient at low expression levels but saturated or was reversed at high expression levels. High expression levels of TGF-β1 were effective at competing VEGF165out of the apical pathway; however, VEGF165did not compete out TGF-β1. Tunicamycin inhibition experiments showed that the apical polarity of VEGF165was independent ofN-glycosylation. We conclude that the apical sorting of these two molecules is a saturable, signal-mediated process, involving competition for apical sorting receptors. The sorting of the two proteins does not appear to involveN-glycans as sorting signals, or lectin sorters. The observations are particularly relevant to gene therapy because they demonstrate that overexpression of a transgene can result in undesirable missorting of the encoded protein.
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