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Cell Growth & Differentiation, Vol 5, Issue 2 187-196, Copyright © 1994 by American Association of Cancer Research


ARTICLES

AP-1 and Krox-24 transcription factors activate the neurofilament light gene promoter in P19 embryonal carcinoma cells

VA Pospelov, TV Pospelova and JP Julien
Institute of Cytology, Russian Academy of Sciences, St. Petersburg.

Changes in the neuronal content of neurofilament proteins occur in some neuropathological conditions, but little is known about the molecular mechanisms that control both the cell type specificity and the levels of expression of neurofilament genes. In addition to TATA and Sp1 elements, we report here the presence in the neurofilament light (NF-L) promoter region of other regulatory elements, namely, an AP-1 element TGCGTCAG, a Krox-24 element GCACCCCGC, and an Ets-like element AGCAAGCAGGAATTT. These elements constitute binding sites for specific nuclear factors present in aggregated P19 embryonal carcinoma cells. Using cotransfection assays in P19 embryonal carcinoma cells, we show that NF-L promoter fragments fused to the reporter chloramphenicol acetyltransferase gene can be trans-activated by expression vectors encoding FOS and JUN (AP-1) and by Krox-24 protein. The finding of functional elements for immediate early gene products in the NF-L promoter suggests molecular pathways by which the modulation of neurofilament expression can be coupled to growth factors and other external stimuli.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1994 by the American Association of Cancer Research.