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Subventricular zone adult mouse neural stem cells and human glioblastoma stem cells require insulin receptor for self-renewal

Chidambaram, S.; Rothbard, D.; Deshpande, K.; Cajuste, Y.; Fiser, A.; Snyder, K.; Farjardo, E.; Tapinos, N.; Wood, T. L.; Levison, S. W.

2020-03-11 neuroscience
10.1101/2020.03.10.985598 bioRxiv
Show abstract

The insulin receptor (IR) is an evolutionarily conserved signaling protein that regulates development and cellular metabolism. IR signaling regulates neurogenesis in Drosophila; however, a specific role for the IR in maintaining adult neural stem cells (NSCs) in mammals has not been investigated. We show that conditionally deleting the IR reduces adult NSCs of the subventricular zone by [~]70% accompanied by a corresponding increase in progenitors. IR deletion produced hyposmia due to aberrant olfactory bulb neurogenesis. Interestingly, hippocampal neurogenesis was not perturbed nor were hippocampal dependent behaviors. Highly aggressive proneural and mesenchymal glioblastomas (GBMs) had high IR/insulin-like growth factor (IGF) pathway gene expression, and isolated glioma stem cells had an aberrantly high ratio of IR:IGF1R receptors. Moreover, IR knockdown inhibited proneural and mesenchymal GBM tumorsphere growth. Altogether, these data demonstrate that the IR is essential for a subset of normal NSCs as well as for brain tumor cancer stem cell self-renewal.

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