Lee KS, Wu Z, Song Y, Mitra SS, Feroze AH, Cheshier SH, Lu B. Roles of PINK1, mTORC2, and mitochondria in preserving brain tumor-forming stem cells in a noncanonical Notch signaling pathway.
Genes Dev 2014;
27:2642-7. [PMID:
24352421 PMCID:
PMC3877754 DOI:
10.1101/gad.225169.113]
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Abstract
Notch signaling maintains Drosophila and mammalian neural stem cells (NSCs). Lee et al. find that canonical and noncanonical Notch signaling cooperate in NSC regulation. In the noncanonical pathway, Notch interacts with PINK1 to influence mitochondrial function, activating mTORC2/AKT signaling and enhancing neuroblast growth. Inhibiting noncanonical Notch signaling preferentially impaired the maintenance of Drosophila and human cancer stem cell (CSC)-like cells. This study identifies a noncanonical Notch signaling pathway preferentially required by brain CSC-like cells.
The self-renewal versus differentiation choice of Drosophila and mammalian neural stem cells (NSCs) requires Notch (N) signaling. How N regulates NSC behavior is not well understood. Here we show that canonical N signaling cooperates with a noncanonical N signaling pathway to mediate N-directed NSC regulation. In the noncanonical pathway, N interacts with PTEN-induced kinase 1 (PINK1) to influence mitochondrial function, activating mechanistic target of rapamycin complex 2 (mTORC2)/AKT signaling. Importantly, attenuating noncanonical N signaling preferentially impaired the maintenance of Drosophila and human cancer stem cell-like tumor-forming cells. Our results emphasize the importance of mitochondria to N and NSC biology, with important implications for diseases associated with aberrant N signaling.
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