Abstract:
:Nerve growth factor (NGF)- and ras-induced neuronal differentiation of PC12 cells is accompanied by expression of transin, a secreted metalloproteinase. Retinoic acid (RA) is known to exert important effects on neural cell proliferation and differentiation. In this study we have analysed different PC12 sublines which express either activated Ras or dominant negative p21N17 Ras, to evaluate the influence of retinoic acid (RA) on the response of the transin gene to NGF and Ras. There was a good correlation between neurite extension and induction of transin mRNA levels in the different subclones. NGF did not induce transin mRNA in cells which do not differentiate in response to this neurotrophin. In addition, incubation with RA did not detectably increase basal transin mRNA levels, but caused a significant increase in the transin response to NGF or Ras in cells in which these factors induce a neuronal morphology. Sequences contained within 750 base pairs of the 5' flanking region of the transin gene confer responsiveness to NGF and Ras, but do not mediate the stimulatory effect of RA. In addition, expression of oncogenic Raf increases transin promoter activity in PC12 cells, but a dominant-negative Raf mutant was unable to block NGF-induced transin activity suggesting the existence of a bifurcation downstream of ras in the signaling mechanism leading to transin expression by NGF.
journal_name
Oncogenejournal_title
Oncogeneauthors
Cosgaya JM,Recio JA,Aranda Adoi
10.1038/sj.onc.1200997subject
Has Abstractpub_date
1997-04-10 00:00:00pages
1687-96issue
14eissn
0950-9232issn
1476-5594journal_volume
14pub_type
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