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    FEBS Lett. 1997 Oct 6;415(3):263-7.

    Distinct patterns of all-trans retinoic acid dependent expression of HOXB and HOXC homeogenes in human embryonal and small-cell lung carcinoma cell lines.

    Flagiello D, Gibaud A, Dutrillaux B, Poupon MF, Malfoy B.

    Source

    Institut Curie - CNRS, UMR 147, Paris, France.

    Abstract

    The expression patterns of the class I homeogenes HOXB and HOXC clusters in the presence of retinoic acid (RA) were studied in two human small-cell lung cancer (SCLC) cell lines and compared to that of NT2/D1 embryonal carcinoma cells. Contrasting with the sequential 3'-5' induction of the HOX genes observed after RA treatment of embryonic NT2/D1 cells, in the SCLC cells the responding genes (induced or down-regulated) were interspersed with insensitive genes (expressed or unexpressed), while no genomic alteration affected the corresponding clusters. These findings imply that HOX gene regulatory mechanisms are altered in non-embryonic SCLC cells, perhaps reflecting their ability to respond to more diversified stimuli, in relation with their origin from adult tissues.

    PMID:
    9357979
    [PubMed - indexed for MEDLINE]

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