Related Experiment Video
Updated: Aug 13, 2026

Isolation of CD133+ Liver Stem Cells for Clonal Expansion
Published on: October 10, 2011
A potential role for p15(Ink4b) and p57(Kip2) in liver development
M M Awad1, J A Sanders, P A Gruppuso
1Department of Pediatrics, Rhode Island Hospital and Brown University School of Medicine, 593 Eddy Street, Providence, RI 02903, USA.
Researchers investigated cyclin-dependent kinase inhibitors (CKIs) in developing hepatocytes. They found p15(Ink4b) and p57(Kip2) likely regulate liver cell proliferation and quiescence.
Area of Science:
- Hepatology and Molecular Biology
- Cell Cycle Regulation
Background:
- Hepatocytes exhibit significant proliferation changes during normal liver development.
- Understanding the molecular mechanisms controlling hepatocyte proliferation is crucial for developmental biology and liver disease research.
Purpose of the Study:
- To investigate the ontogeny of cyclin-dependent kinase inhibitors (CKIs) in hepatocytes.
- To elucidate the role of specific CKIs in regulating hepatocyte proliferation during liver development and in adult quiescent states.
Main Methods:
- Examined the expression patterns of known cyclin-dependent kinase inhibitors (CKIs): p15(Ink4b), p16(Ink4a), p18(Ink4c), p19(Ink4d), p21(Cip1), p27(Kip1), and p57(Kip2).
- Analyzed both mRNA and protein expression levels across different developmental stages from late gestation to adulthood.
Main Results:
- Most CKIs, excluding p16(Ink4a), showed expression during hepatocyte development.
- Expression patterns of p15(Ink4b) and p57(Kip2) correlated with hepatocyte proliferation.
- p57(Kip2) expression aligns with growth arrest in term fetuses; p15(Ink4b) expression suggests a role in maintaining adult hepatocyte quiescence.
Conclusions:
- p57(Kip2) and p15(Ink4b) are identified as potential key regulators of hepatocyte cell cycle control during development and in the adult liver.
- These findings suggest novel roles for these CKIs in hepatocyte proliferation and quiescence, expanding our understanding of liver cell cycle regulation.
More Related Videos
07:09Hepatic Progenitor Specification from Pluripotent Stem Cells using a Defined Differentiation System
Published on: May 10, 2020
08:50In Vitro Cultivation Techniques for Modeling Liver Organogenesis, Building Assembloids, and Designing Synthetic Tissues using Human Cell Lines
Published on: April 18, 2025
Related Concept Videos
Negative Regulator Molecules
Inhibition of Cdk Activity
Abnormal Proliferation
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
Liver Regeneration
Cells of Liver
The liver comprises four major types of cells— hepatocytes, stellate, Kupffer, and sinusoidal endothelial cells. The hepatocytes are large...