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Myc target in myeloid cells-1, a novel c-Myc target, recapitulates multiple c-Myc phenotypes
Xiaoying Yin1, Linnette Grove, Kenneth Rogulski
1Section of Hematology/Oncology, Children's Hospital of Pittsburgh, the Department of Molecular Genetics and Biochemistry, the University of Pittsburgh, and the University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania 15213, USA.
Abstract:
Using cDNA microarrays, we recently identified a large number of transcripts that are regulated differentially by the c-Myc oncoprotein in myeloid cells. Here, we characterize one of these, termed MT-MC1 (Myc Target in Myeloid Cells-1). MT-MC1 is a widely expressed nuclear protein whose overexpression, unlike that of c-Myc targets reported previously, recapitulates multiple c-Myc phenotypes. These include promotion of apoptosis, alteration of morphology, enhancement of anchorage-independent growth, tumorigenic conversion, promotion of genomic instability, and inhibition of hematopoietic differentiation. The MT-MC1 promoter is a direct c-Myc target; it contains two consensus E-box elements, both of which bind c-Myc.Max heterodimers. Mutation of either site abrogates DNA binding by c-Myc.Max and renders the promoter c-Myc unresponsive. Finally, MT-MC1 regulates the expression of several other c-Myc target genes. MT-MC1 represents a proximal and direct c-Myc target that recapitulates many of the properties typically associated with Myc oncoprotein overexpression.
Insights
Myc Target in Myeloid Cells-1 (MT-MC1) is a novel nuclear protein that mimics many c-Myc oncoprotein effects. Its overexpression promotes cancer phenotypes and is directly regulated by c-Myc.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- The c-Myc oncoprotein is a key regulator of cell proliferation, differentiation, and apoptosis.
- Dysregulation of c-Myc is implicated in numerous human cancers.
- Identifying direct c-Myc targets is crucial for understanding its oncogenic functions.
Purpose of the Study:
- To characterize a novel c-Myc-regulated transcript, MT-MC1 (Myc Target in Myeloid Cells-1).
- To investigate the functional consequences of MT-MC1 overexpression in myeloid cells.
- To elucidate the transcriptional regulation of MT-MC1 by c-Myc.
Main Methods:
- cDNA microarrays to identify c-Myc-regulated transcripts.
- Overexpression studies of MT-MC1 in myeloid cells.
- Reporter assays and electrophoretic mobility shift assays (EMSAs) to analyze MT-MC1 promoter activity and c-Myc binding.
- Analysis of downstream gene expression regulated by MT-MC1.
Main Results:
- MT-MC1 is a widely expressed nuclear protein.
- MT-MC1 overexpression recapitulates multiple c-Myc phenotypes, including apoptosis promotion, altered morphology, enhanced anchorage-independent growth, tumorigenic conversion, genomic instability, and inhibition of hematopoietic differentiation.
- The MT-MC1 promoter is a direct c-Myc target, containing two E-box elements essential for c-Myc.Max heterodimer binding and transcriptional regulation.
- MT-MC1 regulates the expression of other c-Myc target genes.
Conclusions:
- MT-MC1 is a proximal and direct transcriptional target of c-Myc.
- MT-MC1 functions as a key mediator of c-Myc's oncogenic activities.
- MT-MC1 represents a significant finding in understanding the molecular mechanisms of c-Myc-driven oncogenesis.