Inhibition of cell differentiation: a critical mechanism for MYC-mediated carcinogenesis?
Despite its early discovery and relevance in cancer, the mechanisms by which MYC brings about tumorigenic transformation have not been clarified. MYC elicits a variety of biological activities, the proliferation promotion being the best studied. However, inhibition of cell differentiation was one of the first MYC activities described. The importance of differentiation impairment in MYC-induced tumorigenesis is demonstrated in transgenic mice models with conditional MYC expression, where MYC inactivation leads to tumor regression associated to re-differentiation of tumor cells. To explain the anti-differentiation effects of MYC, it has been argued that MYC impairs differentiation by preventing exit from the cell cycle. However, we have described models where MYC blocks the erythroid or neuronal differentiation without reversing the proliferative arrest. In these and other models discussed here, MYC-mediated inhibition of differentiation occurs by blocking the upregulation of transcription factors that control the differentiation. The importance of MYC anti-differentiation function has recently gained importance after the discovery that MYC is one of the four transcription factors able to reprogram differentiated cells into pluripotent cells. We will discuss the hypothesis that MYC engages common pathways as a "stemness" keeper and as an oncogene.
Leon
Javier
J
Departamento de Biología Molecular, Facultad de Medicina, Instituto de Biomedicina y Biotecnología de Cantabria, Universidad de Cantabria-CSIC-IDICAN, Avda. Cardenal Herrera Oria s/n; Santander, Spain. leonj@unican.es
Ferrandiz
Nuria
N
Acosta
Juan C
JC
Delgado
M Dolores
MD
D000818:Animals; D002454:Cell Differentiation; D049109:Cell Proliferation; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D051379:Mice; D008954:Models, Biological; D009369:Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology*; D016271:Proto-Oncogene Proteins c-myc / Q000378:metabolism*; D013234:Stem Cells / Q000378:metabolism
D016271:Proto-Oncogene Proteins c-myc