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Cell Growth & Differentiation, Vol 8, Issue 7 789-800, Copyright © 1997 by American Association of Cancer Research


ARTICLES

Transcriptional regulation of intercellular adhesion molecule 1 by phorbol ester in human neuroblastoma cell line SK-N-SH involves jun- and fos-containing activator protein 1 site binding complex(es)

AR Farina, L Cappabianca, AR Mackay, A Tiberio, A Tacconelli, A Tessitore, L Frati, S Martinotti and A Gulino
Department of Experimental Medicine, University of L'Aquila, Italy.

In this study, the regulatory elements involved in ICAM-1 transcriptional response to phorbol ester (12-0-tetradecanoylphorbol-13-acetate; TPA) have been investigated in the human neuroblastoma cell line, SK-N-SH. TPA induced intercellular adhesion molecule 1 (ICAM-1) protein expression in SK-N-SH cells within 24 h of treatment as judged by indirect immunofluorescence. Basal ICAM-1 mRNA levels were barely detectable in untreated SK-N-SH cells but were induced by TPA to a maximal level with 4 h and were reduced thereafter. Analysis of the 5' promoter sequence of ICAM-1 revealed two regions that functioned equally in the TPA induction of ICAM-1 transcription. The first region (-145 to -227) contained a nuclear factor-kappa B (NF kappa B) element. The second region (-316 to -390) contained a putative TPA-responsive element (TRE; TGATTCA) and a TATA box. Deletion and point mutation of the latter region indicated that the TRE was indeed the functional element within this region and acted fully and independently of all other elements including the TATA box at position -352. This TRE bound TPA induced specific nuclear complexes in vitro containing junD, c-jun, c-fos, and fra2 but not cAMP-responsive element binding/activating transcription factor family proteins. ICAM-TRE binding activity was induced within 30 min following TPA treatment. This preceded the appearance of ICAM-NF kappa B site binding activity. Cotransfection of c-jun and c-fos expression vectors into SK-N-SH cells induced transactivation from ICAM-1 promoter constructs containing the intact but not mutated TRE site. Primer extension analyses revealed that TPA had induced transcription exclusively at two sites -40 and -41 bp upstream of the translation start site. These data show that the ICAM-TRE and its cognate jun- and fos-containing transcription factors play a predominant role in the transcriptional response of ICAM-1 to the protein kinase C activator TPA in SK-N-SH cells.


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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 © 1997 by the American Association of Cancer Research.