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Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols
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The cellular regulators PTEN and BMI1 help mediate NEUROGENIN-3-induced cell cycle arrest
R Sergio Solorzano-Vargas1, Matthew Bjerknes2, S Vincent Wu3
1Department of Pediatrics, Division of Gastroenterology and Nutrition, Mattel Children's Hospital and the David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California 90095.
The Journal of Biological Chemistry
|July 26, 2019
Summary
Neurogenin-3 (NEUROG3) controls cell cycle exit during endocrine cell differentiation. It induces quiescence via p21 and BMI1, preventing premature senescence and enabling differentiation.
Area of Science:
- Cell Biology
- Developmental Biology
- Molecular Biology
Background:
- Neurogenin-3 (NEUROG3) is a transcription factor crucial for endocrine cell development in the pancreas and intestine.
- Human NEUROG3 function presents subtle differences compared to its mouse counterpart, necessitating further investigation.
Purpose of the Study:
- To investigate the role of human NEUROG3 in cell cycle regulation during differentiation.
- To elucidate the molecular mechanisms by which NEUROG3 influences cell cycle exit and senescence.
Main Methods:
- Lentivirus-mediated overexpression of human NEUROG3 in BON4 and human nonendocrine cell lines.
- Analysis of cell cycle progression, quiescence, and senescence markers.
- Investigation of NEUROG3 binding to target gene promoters and pathway analysis (PTEN/CDK2).
Main Results:
- NEUROG3 overexpression induced reversible cell cycle exit and quiescence, dependent on CDKN1A/p21.
- Sustained NEUROG3 expression in quiescent cells promoted endocrine differentiation marker expression.
- NEUROG3 regulates CDKN2a/p16 and BMI1 expression, with BMI1 modulating p16-driven senescence and NEUROG3 binding to CDKN1a/p21 and BMI1 promoters.
Conclusions:
- Human NEUROG3 integrates signaling pathways to mediate cell cycle exit at the start of differentiation.
- NEUROG3's regulation of cell cycle inhibitors and senescence pathways is critical for endocrine lineage commitment.
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