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L3MBTL2-mediated CGA transcriptional suppression promotes pancreatic cancer progression through modulating autophagy

Hua Huang1, Ruining Pan1, Yue Zhao2

  • 1Center of Excellence for Environmental Safety and Biological Effects, Beijing International Science and Technology Cooperation Base for Antiviral Drugs, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China.

Iscience
|May 6, 2022
PubMed

Insights

L3MBTL2 promotes tumor development by repressing the tumor suppressor CGA. Glycosylated CGA-transcript1 inhibits pancreatic ductal adenocarcinoma (PDAC) by suppressing autophagy.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Epigenetics

Background:

  • L3MBTL2 is a component of ncPRC1.6, involved in transcriptional repression and chromatin compaction.
  • The precise repression mechanisms and biological functions of L3MBTL2 remain largely undefined.
  • Understanding L3MBTL2's role is crucial for elucidating its oncogenic potential.

Purpose of the Study:

  • To investigate the oncogenic role of L3MBTL2 in tumor development.
  • To elucidate the mechanism by which L3MBTL2 represses downstream targets.
  • To determine the tumor suppressor function of CGA and its transcript variants in pancreatic ductal adenocarcinoma (PDAC).

Main Methods:

  • Chromatin immunoprecipitation (ChIP) assays to assess protein-DNA interactions.
  • Quantitative real-time PCR (qRT-PCR) to measure gene expression levels.
  • Western blotting to detect protein levels and post-translational modifications.
  • Cellular assays to evaluate autophagy inhibition and tumor suppressor activity.

Main Results:

  • L3MBTL2 was found to play a distinct oncogenic role in tumor development.
  • L3MBTL2 repressed the downstream gene CGA via an H2AK119ub1-dependent mechanism.
  • The MGA/MAX heterodimer enhanced L3MBTL2's selective repression of CGA.
  • CGA, particularly CGA-transcript1 (T1), exhibited tumor suppressor activity in PDAC.
  • Glycosylated CGA-T1 inhibited PDAC by repressing autophagy through PI3K/Akt/mTOR and TP53INP2 pathways.

Conclusions:

  • L3MBTL2 acts as an oncogene by repressing the tumor suppressor CGA.
  • CGA-T1 possesses tumor suppressor functions in PDAC, mediated by glycosylation and autophagy inhibition.
  • These findings highlight the critical roles of L3MBTL2 and CGA in cancer development and progression.
Keywords:
Biological sciencesCancerCell biology

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