p63 is a prostate basal cell marker and is required for prostate development.

Area of Science:

• Molecular Biology
• Developmental Biology
• Oncology

Background:

• The p53 homologue p63 protein has multiple isotypes, including TAp63 and DeltaNp63, with distinct functions.
• p63 is crucial for the development of various epithelial organs, including skin appendages and mammary glands.
• p63 is expressed in basal cells of epithelial tissues.

Purpose of the Study:

• To investigate the role of p63 in prostate development and identify its expression patterns in normal and cancerous prostate tissues.
• To determine if p63 is expressed in specific prostate cell types and if its absence impacts prostate formation.

Main Methods:

• Immunohistochemical analysis of p63 expression in mouse and human prostate tissues.
• Culture of prostate basal cells to assess p63 isotype expression.
• Germline inactivation of the p63 gene in mice (p63(-/-)) to study its developmental role.

Main Results:

• p63 is specifically expressed in prostate basal cells, predominantly the DeltaNp63alpha isotype, but not in secretory or neuroendocrine cells.
• p63 protein is absent in human prostate adenocarcinomas.
• p63(-/-) mice exhibit agenesis of the prostate, indicating a requirement for p63 in prostate development.

Conclusions:

• p63 is essential for prostate development and likely plays a critical role in prostate stem cells.
• The absence of p63 in prostate adenocarcinomas suggests a potential tumor suppressor function in this context.
• p63 immunohistochemistry can serve as a valuable diagnostic marker for differentiating benign from malignant prostatic lesions.