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p53 Involvement in the control of murine hair follicle regression
V A Botchkarev1, E A Komarova, F Siebenhaar
1Department of Dermatology, Boston University School of Medicine, Boston, Massachusetts 02118, USA. vladbotc@bu.edu
Abstract:
p53 is a transcription factor mediating a variety of biological responses including apoptotic cell death. p53 was recently shown to control apoptosis in the hair follicle induced by ionizing radiation and chemotherapy, but its role in the apoptosis-driven physiological hair follicle regression (catagen) remains to be elucidated. Here, we show that p53 protein is strongly expressed and co-localized with apoptotic markers in the regressing hair follicle compartments during catagen. In contrast to wild-type mice, p53 knockout mice show significant retardation of catagen accompanied by significant decrease in the number of apoptotic cells in the hair matrix. Furthermore, p53 null hair follicles are characterized by alterations in the expression of markers that are encoded by p53 target genes and are implicated in the control of catagen (Bax, Bcl-2, insulin-like growth factor binding protein-3). These data suggest that p53 is involved in the control of apoptosis in the hair follicle during physiological regression and imply that p53 antagonists may be useful for the management of hair growth disorders characterized by premature entry into catagen, such as androgenetic alopecia, alopecia areata, and telogen effluvium.
Insights
The tumor suppressor p53 (also known as TP53) plays a key role in hair follicle apoptosis during catagen. P53 knockout mice exhibit delayed catagen, suggesting its therapeutic potential for hair loss conditions.
Area of Science:
- Molecular Biology
- Dermatology
- Cell Biology
Background:
- p53 is a crucial transcription factor regulating cellular responses, including apoptosis.
- While p53's role in radiation- and chemotherapy-induced hair follicle apoptosis is known, its function in physiological hair follicle regression (catagen) is unclear.
Purpose of the Study:
- To investigate the role of p53 in the apoptosis-driven process of physiological hair follicle catagen.
- To explore the potential of targeting p53 for managing hair growth disorders.
Main Methods:
- Immunohistochemical analysis of p53 expression and apoptotic markers in hair follicles during catagen.
- Comparison of catagen progression and apoptosis levels in wild-type and p53 knockout mice.
- Analysis of p53 target gene expression (Bax, Bcl-2, IGFBP-3) in p53 null hair follicles.
Main Results:
- p53 protein is highly expressed and co-localized with apoptotic markers in regressing hair follicle compartments.
- p53 knockout mice displayed significantly delayed catagen and reduced hair matrix apoptosis.
- p53 null hair follicles showed altered expression of key catagen regulatory genes, including Bax, Bcl-2, and IGFBP-3.
Conclusions:
- p53 is integral to the control of apoptosis during physiological hair follicle regression.
- p53 antagonists may offer a therapeutic strategy for hair loss disorders involving premature catagen, such as androgenetic alopecia, alopecia areata, and telogen effluvium.