Journal
AUTOPHAGY
Volume 10, Issue 7, Pages 1193-1211Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/auto.28768
Keywords
autophagy; mechanistic target of rapamycin; MAPK/JNK (mitogen-activated protein kinase/c-Jun N-terminal kinase); RAPTOR; organelles; signal transduction; cell development; cell maturation; lens; organelle-free zone formation
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Funding
- National Institutes of Health (NIH) [EY010577, EY14258]
- National Academy of Sciences
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Although autophagic pathways are essential to developmental processes, many questions still remain regarding the initiation signals that regulate autophagy in the context of differentiation. To address these questions we studied the ocular lens, as the programmed elimination of nuclei and organelles occurs in a precisely regulated spatiotemporal manner to form the organelle-free zone (OFZ), a characteristic essential for vision acuity. Here, we report our discovery that inactivation of MAPK/JNK induces autophagy for formation of the OFZ through its regulation of MTORC1, where MAPK/ JNK signaling is required for both MTOR activation and RPTOR/RAPTOR phosphorylation. Autophagy pathway proteins including ULK1, BEC N1/Beclin 1, and MAP1LC3B2/LC3B-II were upregulated in the presence of inhibitors to either MAPK/ JNK or MTOR, inducing autophagic loss of organelles to form the OFZ. These results reveal that MAPK/JNK is a positive regulator of MTORC1 signaling and its developmentally regulated inactivation provides an inducing signal for the coordinated autophagic removal of nuclei and organelles required for lens function.
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