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Early overexpression of Cdk4 and possible role of KRF and c-myc in chewing tobacco mediated oral cancer development

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Abstract

Cyclin Dependent Kinase 4 (Cdk4) is known to be an oncogene and is involved in various cancers. It is overexpressed either by genomic amplification or by c-myc dependent manner. Our preliminary results indicate high expression of protein and mRNA as well as absence of genomic amplification in early oral cancer development. One transcription factor (TF) binding site has been detected from −281 to −298 by using DNase I foot printing and confirmed by electrophoretic mobility shift assay. This is a novel DNA sequence. The recruitment of this new TF as well as the earlier reported c-myc was analyzed in various stage of oral cancer development. The binding activity of the new TF is present in normal tissues and observed more in initial stage samples whereas c-myc expression was absent in normal and more in higher stage of oral cancer development. On the basis of these findings we propose the new TF to be a possible CdK4 Regulating Factor (KRF). This might maintain the basal level transcription in normal and activates Cdk4 transcription in the initial stage, where as the same role is carried by c-myc in higher stage of chewing tobacco mediated oral cancer development.

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Authors and Affiliations

  1. Molecular Oncology and Medical Biotechnology Division, Institute of Life Sciences, Nalco Square, Chandrasekharpur, Bhubaneswar-, 751 023, India

    Rajakishore Mishra & Bibhu Ranjan Das

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  1. Rajakishore Mishra
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  2. Bibhu Ranjan Das
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Mishra, R., Ranjan Das, B. Early overexpression of Cdk4 and possible role of KRF and c-myc in chewing tobacco mediated oral cancer development. Mol Biol Rep 30, 207–213 (2003). https://doi.org/10.1023/A:1026384402585

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