Abstract:
:A rat pheochromocytoma cell line (PC12 cells) was used as a model to investigate the role of calmodulin and its multiple mRNAs in NGF-induced neuronal differentiation. The effect of NGF on the degree of differentiation was assayed using a simple differentiation scoring system. Significant increases in the differentiation score were seen by one day, and the scores increased about 10-fold by 8 days of treatment. NGF also increased calmodulin in the PC12 cells; significant increases were seen by 2 days of treatment, and a maximum increase of 3-fold was seen by 4 days. Northern blot analysis using a calmodulin riboprobe revealed that all five calmodulin mRNAs found in rat tissue were present in PC12 cells. The relative abundance of the calmodulin mRNAs was 1.7 greater than 1.4 greater than 2.3 greater than 4.1 greater than 0.9 kb. NGF treatment caused a differential increase in these mRNAs. The 1.4 kb transcript (from Gene II) was increased earlier (at 1 day) and to a greater extent (3-fold) than any of the other mRNAs. Studies of the half-lives (t1/2) of these mRNAs suggested that the t1/2 varied with the mRNA; the smaller the mRNA, the shorter the t1/2. However, there were no significant effects of NGF on the t1/2 of any of the mRNAs. These studies indicate that NGF elevates calmodulin in PC12 cells by causing a differential increase in the multiple mRNAs for calmodulin and that the increase in calmodulin may play some part in NGF-induced neuronal differentiation in PC12 cells.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Bai G,Weiss Bdoi
10.1002/jcp.1041490309subject
Has Abstractpub_date
1991-12-01 00:00:00pages
414-21issue
3eissn
0021-9541issn
1097-4652journal_volume
149pub_type
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