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Effects of chromogranin expression on inositol 1,4,5-trisphosphate-induced intracellular Ca2+ mobilization.

Abstract：

:We show here that expression of chromogranins in non-neuroendocrine NIH3T3 cells significantly increased the amount of IP(3)-mediated intracellular Ca(2+) mobilization in these cells, whereas suppression of them in neuroendocrine PC12 cells decreased the amount of mobilized Ca(2+). We have therefore investigated the relationship between the IP(3)-induced intracellular Ca(2+) mobilization and secretory granules. The level of IP(3)-mediated Ca(2+) release in CGA-expressing NIH3T3 cells was 40% higher than in the control cells, while that of CGB-expressing cells was 134% higher, reflecting the number of secretory granules formed. Suppression of CGA and CGB expression in PC12 cells resulted in 41 and 78% reductions in the number of secretory granules, respectively, while the extents of IP(3)-induced Ca(2+) release in these cells were reduced 40 and 69%, respectively. The newly formed secretory granules of NIH3T3 cells contained all three isoforms of the IP(3)Rs. Comparison of the concentrations of the IP(3)R isoforms expressed in the ER and nucleus of chromogranin-expressing and nonexpressing NIH3T3 cells did not show significant differences, indicating that chromogranin expression did not affect the expression of endogenous IP(3)Rs. Nonetheless, the IP(3)R concentrations in secretory granules of chromogranin-expressing NIH3T3 cells were 3.5-4.7-fold higher than those of the ER, similar to the levels found in secretory granules of neuroendocrine chromaffin cells, thus suggesting that the IP(3)Rs targeted to the newly formed secretory granules are newly induced by chromogranins without affecting the expression of intrinsic IP(3)Rs. These results strongly suggest that the extent of IP(3)-induced intracellular Ca(2+) mobilization in secretory cells is closely related to the number of secretory granules.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Huh YH,Jeon SH,Yoo JA,Park SY,Yoo SH

doi

10.1021/bi048070w

subject

Has Abstract

pub_date

2005-04-26 00:00:00

pages

6122-32

issue

16

eissn

0006-2960

issn

1520-4995

journal_volume

44

pub_type

杂志文章

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