Expression profiles and clinical relationships of ID2, CDKN1B, and CDKN2A in primary neuroblastoma

Genes, Chromosomes & Cancer
Sigrun GebauerM B Diccianni

Abstract

Despite considerable research into the etiology of neuroblastoma, the molecular basis of this disease has remained elusive. In contrast to the absence of expression of the known tumor suppressor CDKN2A (also known as p16 and INK4A) in a wide variety of tumor types we have found in previous studies that CDKN2A protein is paradoxically highly expressed in many advanced stage neuroblastomas and unrelated to RB1 status. In the present study, we sought to identify the mechanistic relationships that might influence CDKN2A expression and negate its influence on tumor cell proliferation. In this regard, we examined the role of the tumor-suppressor gene CDKN1B (also known as p27 and Kip1) and the oncogene ID2 in relationship to CDKN2A expression, MYCN amplification, and neuroblastoma pathogenesis in 17 neuroblastoma cell lines and 129 samples of primary tumors of all stages. All neuroblastoma cell lines expressed the ID2 transcript and protein. However, although the majority of primary neuroblastomas also expressed the ID2 transcript, expression of the ID2 protein was undetectable or only barely detectable, regardless of transcript expression. In both cell lines and primary tumors, ID2 expression was independent of both CDKN2A and MYCN ...Continue Reading

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May 26, 2009·Pathology Oncology Research : POR·Safiye AktasNur Olgun
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