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    Cancer Res. 1995 Aug 1;55(15):3456-61.

    Identification and characterization of human beta 2-chimaerin: association with malignant transformation in astrocytoma.

    Yuan S, Miller DW, Barnett GH, Hahn JF, Williams BR.

    Source

    Brain Tumor Center of the Department of Neurological Surgery, Cleveland Clinic Foundation, Ohio 44195, USA.

    Abstract

    Molecular processes resulting in the malignant transformation from low- to high-grade astrocytoma remain poorly understood. Using reverse transcriptase PCR, we identified a gene that is differentially expressed in normal brain and low-grade astrocytoma compared to glioblastoma tissues. This gene is identical to human beta 2-chimaerin, which encodes a 468-amino acid GTPase-activating protein for p21rac. The gene was localized to human chromosome 7p15.3 by fluorescence in situ hybridization mapping. Human beta 2-chimaerin is expressed in a variety of human tissues, with the highest expression level detected in human brain and pancreas. RNase protection assays indicated that the expression level of this gene is high in all the normal brain and low-grade astrocytoma samples tested compared to malignant gliomas. The down-regulation of beta 2-chimaerin expression in the high-grade gliomas suggests that decreased expression of this gene may be a feature of progression in the development of malignant glioma.

    PMID:
    7614486
    [PubMed - indexed for MEDLINE]
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