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The c-Myc target gene PRDX3 is required for mitochondrial homeostasis and neoplastic transformation.

ABSTRACT: Deregulated expression of the c-Myc transcription factor is found in a wide variety of human tumors. Because of this significant role in oncogenesis, considerable effort has been devoted to elucidating the molecular program initiated by deregulated c-myc expression. The primary transforming activity of Myc is thought to arise through transcriptional regulation of numerous target genes. Thus far, Myc target genes involved in mitochondrial function have not been characterized in depth. Here, we describe a nuclear c-Myc target gene, PRDX3, which encodes a mitochondrial protein of the peroxiredoxin gene family. Expression of PRDX3 is induced by the mycER system and is reduced in c-myc(-/-) cells. Chromatin immunoprecipitation analysis spanning the entire PRDX3 genomic sequence reveals that Myc binds preferentially to a 930-bp region surrounding exon 1. We show that PRDX3 is required for Myc-mediated proliferation, transformation, and apoptosis after glucose withdrawal. Results using mitochondria-specific fluorescent probes demonstrate that PRDX3 is essential for maintaining mitochondrial mass and membrane potential in transformed rat and human cells. These data provide evidence that PRDX3 is a c-Myc target gene that is required to maintain normal mitochondrial function.

SUBMITTER: Wonsey DR

PROVIDER: S-EPMC124457 | biostudies-literature | 2002 May

REPOSITORIES: biostudies-literature

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The c-Myc target gene PRDX3 is required for mitochondrial homeostasis and neoplastic transformation.

Wonsey Diane R DR Zeller Karen I KI Dang Chi V CV

Proceedings of the National Academy of Sciences of the United States of America 20020501 10

Deregulated expression of the c-Myc transcription factor is found in a wide variety of human tumors. Because of this significant role in oncogenesis, considerable effort has been devoted to elucidating the molecular program initiated by deregulated c-myc expression. The primary transforming activity of Myc is thought to arise through transcriptional regulation of numerous target genes. Thus far, Myc target genes involved in mitochondrial function have not been characterized in depth. Here, we de ...[more]

PMID: 12011429

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Project description:BACKGROUND:Mesenchymal stromal cells isolated from bone marrow (MSC) represent an attractive source of adult stem cells for regenerative medicine. However, thorough research is required into their clinical application safety issues concerning a risk of potential neoplastic degeneration in a process of MSC propagation in cell culture for therapeutic applications. Expansion protocols could preselect MSC with elevated levels of growth-promoting transcription factors with oncogenic potential, such as c-MYC. We addressed the question whether c-MYC expression affects the growth and differentiation potential of human MSC upon extensive passaging in cell culture and assessed a risk of tumorigenic transformation caused by MSC overexpressing c-MYC in vivo. METHODS:MSC were subjected to retroviral transduction to induce expression of c-MYC, or GFP, as a control. Cells were expanded, and effects of c-MYC overexpression on osteogenesis, adipogenesis, and chondrogenesis were monitored. Ectopic bone formation properties were tested in SCID mice. A potential risk of tumorigenesis imposed by MSC with c-MYC overexpression was evaluated. RESULTS:C-MYC levels accumulated during ex vivo passaging, and overexpression enabled the transformed MSC to significantly overgrow competing control cells in culture. C-MYC-MSC acquired enhanced biological functions of c-MYC: its increased DNA-binding activity, elevated expression of the c-MYC-binding partner MAX, and induction of antagonists P19ARF/P16INK4A. Overexpression of c-MYC stimulated MSC proliferation and reduced osteogenic, adipogenic, and chondrogenic differentiation. Surprisingly, c-MYC overexpression also caused an increased COL10A1/COL2A1 expression ratio upon chondrogenesis, suggesting a role in hypertrophic degeneration. However, the in vivo ectopic bone formation ability of c-MYC-transduced MSC remained comparable to control GFP-MSC. There was no indication of tumor growth in any tissue after transplantation of c-MYC-MSC in mice. CONCLUSIONS:C-MYC expression promoted high proliferation rates of MSC, attenuated but not abrogated their differentiation capacity, and did not immediately lead to tumor formation in the tested in vivo mouse model. However, upregulation of MYC antagonists P19ARF/P16INK4A promoting apoptosis and senescence, as well as an observed shift towards a hypertrophic collagen phenotype and cartilage degeneration, point to lack of safety for clinical application of MSC that were manipulated to overexpress c-MYC for their better expansion.

Dataset Information

The c-Myc target gene PRDX3 is required for mitochondrial homeostasis and neoplastic transformation.

Publications

The c-Myc target gene PRDX3 is required for mitochondrial homeostasis and neoplastic transformation.

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