Neurosecretion competence. A comprehensive gene expression program identified in PC12 cells

The phenotype of neurosecretory cells is characterized by clear vesicles and dense granules, both discharged by regulated exocytosis. However, these organelles are lacking completely in a few neurosecretion-incompetent clones of the pheochromocytoma PC12 line, in which other specific features are ma...

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Bibliographic Details
Published in:The Journal of biological chemistry 2002-09, Vol.277 (39), p.36715-36724
Main Authors: Grundschober, Christophe, Malosio, Maria Luisa, Astolfi, Laura, Giordano, Tiziana, Nef, Patrick, Meldolesi, Jacopo
Format: Article
Language:English
Subjects:
Animals
Blotting, Northern
Cell Line
Down-Regulation
Expressed Sequence Tags
Neurons - metabolism
Nucleic Acid Hybridization
Oligonucleotide Array Sequence Analysis
PC12 Cells
Rats
Reverse Transcriptase Polymerase Chain Reaction
RNA, Messenger - metabolism
Statistics as Topic
Transcription, Genetic
Up-Regulation
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Summary:The phenotype of neurosecretory cells is characterized by clear vesicles and dense granules, both discharged by regulated exocytosis. However, these organelles are lacking completely in a few neurosecretion-incompetent clones of the pheochromocytoma PC12 line, in which other specific features are maintained (incompetent clones). In view of the heterogeneity of PC12 cells, a differential characterization of the incompetent phenotype based on the comparison of a single incompetent and a single wild-type clone would have been inconclusive. Therefore, we have compared two pairs of PC12 clones, studying in parallel the transcript levels of 4,200 genes and 19,000 express sequence tags (ESTs) by high density oligonucleotide arrays. After accurate data processing for quality control and filtration, a total of 755 transcripts, corresponding to 448 genes and 307 ESTs, was found consistently changed, with 46% up-regulated and 54% down-regulated in incompetent versus wild-type clones. Many but not all neurosecretion genes were profoundly down-regulated in incompetent cells. Expression of endocytosis genes was normal, whereas that of many nuclear and transcription factors, including some previously shown to play key roles in neurogenesis, was profoundly changed. Additional differences appeared in genes involved in signaling and metabolism. Taken together these results demonstrate for the first time that expression of neurosecretory vesicles and granules is part of a complex gene expression program that includes many other features that so far have not been recognized.
ISSN:0021-9258
DOI:10.1074/jbc.M203777200