Polarized secretion of the regulated secretory protein chromogranin A.

Polarized secretion of the regulated secretory protein chromogranin A.
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调节分泌蛋白嗜铬粒蛋白 A 的极化分泌。

DOI:
10.1006/bbrc.2000.2469
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发表时间:
2000
期刊:
Biochemical and biophysical research communications.
影响因子:
--
通讯作者:
Gorr,SU
Gorr,SU
中科院分区:
--
文献类型:
--
作者:
Kuhn,U;Cohn,DV;Gorr,SU

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Bovine chromogranin A (CgA), together with secreted alkaline phosphatase (SEAP) as an external control for apical secretion were expressed in MDCK cells to test if CgA contains sorting signals for polarized secretion. CgA, SEAP, and the endogenous apical marker GP80 were secreted 75–80% apically. Basolateral secretion of SEAP was inhibited 40% by ammonium chloride. Sulfate labeling and digestion with chondroitinase ABC revealed a 120 kDa proteoglycan-CgA and 75 kDa CgA. Inhibition of proteoglycan synthesis did not affect apical secretion of CgA. As CgA is not N-glycosylated, we used tunicamycin to test if cellular N-glycosylation is required for apical sorting. Tunicamycin reversed the polarity of secretion of CgA to the basolateral side. These results suggest that CgA contains dominant apical and recessive basolateral sorting information.
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