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CUSP/p63 expression in rat and human tissues.

R P Dellavalle1, T B Egbert, A Marchbank

  • 1Department of Dermatology, University of Colorado School of Medicine, B-153, 4200 E. Ninth Avenue, Denver, CO 90262, USA.

Journal of Dermatological Science
|September 5, 2001
PubMed
Summary
This summary is machine-generated.

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p63 protein is crucial for epithelial development and its expression patterns vary across tissues. Understanding p63 isoforms and their specific roles is key to resolving conflicting research findings.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Immunology

Background:

  • p63, a homolog of the p53 tumor suppressor, is vital for epithelial development.
  • CUSP, a p63 product, is an autoantigen in chronic ulcerative stomatitis (CUS).
  • Conflicting reports exist regarding p63 and CUSP expression patterns.

Purpose of the Study:

  • To investigate and clarify the expression profile of p63 across various human and rat tissues.
  • To reconcile discrepancies in previous p63 and CUSP expression studies.

Main Methods:

  • Northern blot analysis of RNA from multiple human tissues.
  • Reverse transcriptase polymerase chain reaction (rtPCR) for p63 RNA in normal skin and basal cell carcinoma.
  • Indirect immunofluorescence using CUS patient sera on rat tissues.

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Main Results:

  • p63 RNA detected in skin, thymus, placenta, skeletal muscle, kidney, and lung; non-transactivating isoforms abundant in skin, thymus, and placenta.
  • Abundant non-transactivating p63 RNA and minimal transactivating p63 RNA found in human basal cell carcinoma and adjacent normal skin.
  • Immunofluorescence confirmed p63 expression in skin, oral epithelium, tongue, kidney, and trachea, but not in liver, large intestine, testis, skeletal muscle, or heart.

Conclusions:

  • p63 expression is tissue-specific and involves complex isoform arrays.
  • Discrepancies in reported p63/CUSP expression may stem from focal expression, isoform diversity, and technical variations in probes and antibodies.
  • Further research is needed to fully elucidate the role of p63 isoforms in epithelial development and disease.