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HMGA2 sustains self-renewal and invasiveness of glioma-initiating cells.

Oncotarget 2016 July 13
Glioblastoma multiforme (GBM) is the most common type of brain tumors with dismal outcomes. The mesenchymal phenotype is the hallmark of tumor aggressiveness in GBMs. Perivascular smooth muscle cells (pericytes) are essential in homeostasis of normal and glioma tissues. Here we found HMGA2, an architectural transcription factor that promotes mesenchymal phenotypes in a number of solid tumors, is highly expressed in mesenchymal subtype of GBMs and labels both glioma pericytes and glioma-initiating cells (GICs). Accordingly, depletion of HMGA2 in GICs resulted in compromised self-renewal and tumorigenic capability, as well as undermined mesenchymal or pericyte differentiation. We further showed HMGA2 allows expressions of FOXM1 and PLAU to maintain GIC propagation, gliomagenesis and aggressiveness both in vitro and in vivo. Therefore, suppressing HMGA2-mediated GIC self-renewal and invasiveness might be a promising means to treat GBMs.

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