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Suppression of MAPK/JNK-MTORC1 signaling leads to premature loss of organelles and nuclei by autophagy during terminal differentiation of lens fiber cells
Journal article   Open access   Peer reviewed

Suppression of MAPK/JNK-MTORC1 signaling leads to premature loss of organelles and nuclei by autophagy during terminal differentiation of lens fiber cells

Subhasree Basu, Suren Rajakaruna, Beverly Reyes, Elisabeth Van Bockstaele and A Sue Menko
Autophagy, v 10(7), pp 1193-1211
01 Jul 2014
DOI: https://doi.org/10.4161/auto.28768
PMID: 24813396
Featured in Collection :   UN Sustainable Development Goals @ Drexel
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https://doi.org/10.4161/auto.28768View
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Abstract

Animals Autophagy Avian Proteins - metabolism Cell Differentiation Cell Nucleus - metabolism Cell Nucleus - ultrastructure Chick Embryo Cytoplasmic Vesicles - metabolism Cytoplasmic Vesicles - ultrastructure Endoplasmic Reticulum - metabolism Endoplasmic Reticulum - ultrastructure Golgi Apparatus - metabolism Golgi Apparatus - ultrastructure JNK Mitogen-Activated Protein Kinases - metabolism Lens, Crystalline - embryology Lens, Crystalline - pathology Lens, Crystalline - ultrastructure MAP Kinase Signaling System Mechanistic Target of Rapamycin Complex 1 Models, Biological Multiprotein Complexes - metabolism Time Factors TOR Serine-Threonine Kinases - metabolism
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, BECN1/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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