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Manic fringe inhibits tumor growth by suppressing Notch3 degradation in lung cancer
Fuming Yi1, Baru Amarasinghe, Thao P Dang
1Division of Hematology and Medical Oncology, University of Virginia Charlottesville, VA, USA.
Abstract:
Notch signaling plays an essential role in development as well as cancer. We have previously shown that Notch3 is important for lung cancer growth and survival. Notch receptors are activated through the interaction with their ligands, resulting in proteolytic cleavage of the receptors. This interaction is modulated by Fringe, a family of fucose-specific β1,3 N-acetylglucosaminyltransferases that modify the extracellular subunit of Notch receptors. Studies in developmental models showed that Fringe enhances Notch's response to Delta ligands at the expense of Jagged ligands. We observed that Manic Fringe expression is down-regulated in lung cancer. Since Jagged1, a known ligand for Notch3, is often over-expressed in lung cancer, we hypothesized that Fringe negatively regulates Notch3 activation. In this study, we show that re-expression of Manic Fringe down-regulates Notch3 target genes HES1 and HeyL and reduces tumor phenotype in vitro and in vivo. The mechanism for this phenomenon appears to be related to modulation of Notch3 protein stability. Proteasome inhibition reverses Manic Fringe-induced protein turnover. Taken together, our data provide the first evidence that Manic Fringe functions as a tumor suppressor in the lung and that the mechanism of its anti-tumor activity is mediated by inhibition of Notch3 activation.
Insights
Manic Fringe acts as a tumor suppressor in lung cancer by down-regulating Notch3 signaling. Re-expressing Manic Fringe reduces tumor growth and survival, offering a potential therapeutic strategy.
Area of Science:
- Molecular biology
- Cancer research
- Cell signaling
Background:
- Notch signaling is crucial in development and cancer, with Notch3 promoting lung cancer growth.
- Fringe enzymes modulate Notch receptor activity by altering interactions with ligands like Jagged1.
- Manic Fringe (MF) expression is reduced in lung cancer, while its ligand Jagged1 is often overexpressed.
Purpose of the Study:
- To investigate the role of Manic Fringe in regulating Notch3 activation in lung cancer.
- To determine if Manic Fringe functions as a tumor suppressor in lung cancer.
- To elucidate the mechanism by which Manic Fringe exerts its anti-tumor effects.
Main Methods:
- Assessed the impact of Manic Fringe re-expression on Notch3 target genes (HES1, HeyL) in vitro and in vivo.
- Investigated the effect of Manic Fringe on lung tumor phenotype.
- Examined the role of protein stability and proteasomal degradation in Manic Fringe-mediated Notch3 regulation.
Main Results:
- Re-expression of Manic Fringe led to down-regulation of Notch3 target genes HES1 and HeyL.
- Manic Fringe re-expression reduced lung tumor cell phenotype in both in vitro and in vivo models.
- The anti-tumor mechanism involves modulation of Notch3 protein stability, with proteasome inhibition reversing Manic Fringe-induced turnover.
Conclusions:
- Manic Fringe acts as a tumor suppressor in lung cancer.
- Manic Fringe inhibits Notch3 activation, thereby reducing tumor growth and survival.
- Targeting Manic Fringe or Notch3 signaling presents a potential therapeutic avenue for lung cancer.
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