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Glossary p21

protein that inhibits cell cycle progression for DNA repair

p21 is a protein that acts as a regulator of the cell cycle. It is known for its role in inhibiting the activity of cyclin-dependent kinases (CDKs), which are crucial for cell division. By doing so, p21 can halt the cell cycle, allowing for DNA repair or triggering cell death if the damage is irreparable. This function is particularly important in preventing the proliferation of damaged cells, which can lead to cancer.

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research OCT4 maintains self-renewal and reverses senescence in human hair follicle mesenchymal stem cells through the downregulation of p21 by DNA methyltransferases

57 citations , January 2019 in “Stem Cell Research & Therapy”

OCT4 helps hair stem cells renew and fight aging, potentially aiding hair regrowth.

Transient Mitochondrial DNA Double Strand Breaks in Mice Cause Accelerated Aging Phenotypes in a ROS-Dependent but p53/p21-Independent Manner

research Transient mitochondrial DNA double strand breaks in mice cause accelerated aging phenotypes in a ROS-dependent but p53/p21-independent manner

42 citations , December 2016 in “Cell Death & Differentiation”

This study found that transient mtDNA double strand breaks in mice accelerated aging in certain tissues through increased reactive oxygen species, independent of p21/p53 pathway mediation.

Hair Growth Promoting and Anticancer Effects of p21-Activated Kinase 1 (PAK1) Inhibitors Isolated from Different Parts of Alpinia Zerumbet

research Hair Growth Promoting and Anticancer Effects of p21-activated kinase 1 (PAK1) Inhibitors Isolated from Different Parts of Alpinia zerumbet

13 citations , January 2017 in “Molecules”

This study reported that compounds isolated from Alpinia zerumbet significantly promoted hair cell growth and exhibited anticancer activity in cell cultures, suggesting potential as treatments for alopecia and cancer.

research Cyclin-dependent kinase inhibitors, p21waf1/cip1 and p27kip1, are expressed site- and hair cycle-dependently in rat hair follicles

9 citations , February 2001 in “Journal of Dermatological Science”

This study found that the expressions of CDK inhibitors p21waf1/cip1 and p27kip1 were higher during the anagen phase compared to telogen, suggesting a role in follicular epithelial cell differentiation.

research HIF‐2α/ARNT complex regulates hair development via induction of p21 ^Waf1/Cip1 and p27 ^Kip1

4 citations , March 2014 in “The FASEB Journal”

This study observed that deleting ARNT in keratinocytes of mice reduced zigzag hair production and altered hair follicle differentiation, likely by affecting the expression of specific cyclin-dependent kinase inhibitors.

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