例如:"lncRNA", "apoptosis", "WRKY"

Erbin is a novel substrate of the Sag-βTrCP E3 ligase that regulates KrasG12D-induced skin tumorigenesis.

J. Cell Biol.2015 Jun 8;209(5):721-37
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摘要


SAG/RBX2 is the RING (really interesting new gene) component of Cullin-RING ligase, which is required for its activity. An organ-specific role of SAG in tumorigenesis is unknown. We recently showed that Sag/Rbx2, upon lung-targeted deletion, suppressed Kras(G12D)-induced tumorigenesis via inactivating NF-κB and mammalian target of rapamycin pathways. In contrast, we report here that, upon skin-targeted deletion, Sag significantly accelerated Kras(G12D)-induced papillomagenesis. In Kras(G12D)-expressing primary keratinocytes, Sag deletion promotes proliferation by inhibiting autophagy and senescence, by inactivating the Ras-Erk pathway, and by blocking reactive oxygen species generation. This is achieved by accumulation of Erbin to block Ras activation of Raf and Nrf2 to scavenge and can be rescued by knockdown of Nrf2 or Erbin. Simultaneous one-allele deletion of the Erbin-encoding gene Erbb2ip partially rescued the phenotypes. Finally, we characterized Erbin as a novel substrate of SAG-βTrCP E3 ligase. By degrading Erbin and Nrf2, Sag activates the Ras-Raf pathway and causes duanyu1670 accumulation to trigger autophagy and senescence, eventually delaying Kras(G12D)-induced papillomagenesis and thus acting as a skin-specific tumor suppressor.

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