Abstract:
:We have established a number of cell lines from Merkel cell carcinoma (MCC) of the skin. In many respects these cell lines resemble those established from small cell lung cancer (SCLC) and it is difficult to differentiate between metastatic MCC and SCLC on morphological or histochemical criteria. Both are thought to be neuroendocrine tumours and may express a number of neuroendocrine markers. SCLC cell lines express the octamer-DNA binding transcription factor brn-2 gene products N-Oct3 and N-Oct5, which are restricted to the neuroectodermal cell lineage. In DNA binding studies using a consensus octamer recognition site we have found that 4 of 8 MCC cell lines examined expressed brn-2 in at least trace amounts compared with 3 SCLC cell lines which all expressed brn-2 proteins at high levels. Moreover, these DNA binding studies were extended by using a high-affinity brn-2 recognition site related to the degenerate octamer TAATGARAT-motif. This identified a novel DNA binding protein in a subset of MCC cell lines. The protein was absent from the three SCLC cell lines, melanoma cells and brain tissue. This binding activity, which we term Merkel cell DNA nuclear (MNF), was shown to be specific by competitive inhibition with oligonucleotide binding sites and was not inhibited by polyclonal antisera against the Oct-1, Oct-2 or Brn-2 proteins. This protein may serve as a unique marker for MCC compared with SCLC cells and may be involved in regulating the Merkel cell phenotype.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Thomson JA,Leonard JH,McGregor K,Sturm RA,Parsons PGdoi
10.1002/ijc.2910580223subject
Has Abstractpub_date
1994-07-15 00:00:00pages
285-90issue
2eissn
0020-7136issn
1097-0215journal_volume
58pub_type
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