Expression of MYCN in Multipotent Sympathoadrenal Progenitors Induces Proliferation and Neural Differentiation, but Is Not Sufficient for Tumorigenesis.

Mobley BC, Kwon M, Kraemer BR, Hickman FE, Qiao J, Chung DH, Carter BD
PLoS One. 2015 10 (7): e0133897

PMID: 26222553 · PMCID: PMC4519318 · DOI:10.1371/journal.pone.0133897

Neuroblastoma is a pediatric malignancy of the sympathetic ganglia and adrenal glands, hypothesized to originate from progenitors of the developing sympathetic nervous system. Amplification of the MYCN oncogene is a genetic marker of risk in this disease. Understanding the impact of oncogene expression on sympathoadrenal progenitor development may improve our knowledge of neuroblastoma initiation and progression. We isolated sympathoadrenal progenitor cells from the postnatal murine adrenal gland by sphere culture and found them to be multipotent, generating differentiated colonies of neurons, Schwann cells, and myofibroblasts. MYCN overexpression in spheres promoted commitment to the neural lineage, evidenced by an increased frequency of neuron-containing colonies. MYCN promoted proliferation of both sympathoadrenal progenitor spheres and differentiated neurons derived from these spheres, but there was also an increase in apoptosis. The proliferation, apoptosis, and neural lineage commitment induced by MYCN are tumor-like characteristics and thereby support the hypothesis that multipotent adrenal medullary progenitor cells are cells of origin for neuroblastoma. We find, however, that MYCN overexpression is not sufficient for these cells to form tumors in nude mice, suggesting that additional transforming mutations are necessary for tumorigenesis.

MeSH Terms (19)

Adrenal Glands Animals Apoptosis Carcinogenesis Cell Differentiation Cell Lineage Cell Proliferation Ganglia, Sympathetic Gene Expression Regulation Male Mice Mice, Nude Multipotent Stem Cells N-Myc Proto-Oncogene Protein Neural Crest Neural Stem Cells Neuroblastoma Neurons Proto-Oncogene Proteins

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