Endogenous p63 acts as a survival factor for tumour cells of SCCHN origin.

Endogenous p63 acts as a survival factor for tumour cells of SCCHN origin. Research Abstract Details 

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Endogenous p63 acts as a survival factor for tumour cells of SCCHN origin. Abstract Text:

The human p63 gene encodes a series of proteins that differ in their N- and/or C-terminal sequences and have widely differing properties in promoting or repressing p53-related functions such as growth arrest and apoptosis. In addition, p63 has important roles in the maintenance and differentiation of epithelial cell populations. Squamous cell carcinomas of the head and neck (SCCHN) express high levels of DeltaNp63 and p63beta isoforms compared to normal tissue from the same patients, suggesting a role for these isoforms in the pathogenesis of this common human malignancy. Here, we explore the function of p63 in SCCHN cells by using small interfering RNA (siRNA) to silence the expression of different isoforms in two SCCHN cell lines, FaDu and SCC-25. Silencing results in statistically significant decreased survival for tumour cells when all p63 isoforms, the N-terminal truncated or the alpha isoforms are inhibited. No effect was observed on cell proliferation or on the expression of epithelial differentiation markers. We also demonstrate that inhibition of endogenous p63 expression sensitises cells to the effects of ionizing radiation and cisplatin, common treatments for SCCHN patients. The data indicate that p63 has oncogenic properties in SCCHN and is predominantly involved in maintaining cell survival, rather than acting as a directly proliferative factor or as an inhibitor of terminal differentiation. Moreover, targeted inhibition of p63 expression in SCCHN could be a useful adjunct for conventional treatments of this disease.

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Endogenous p63 acts as a survival factor for tumour cells of SCCHN origin. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: International journal of molecular medicine

VOLUME: 16

Page Numbers: 1065-70

Journal Abbreviation: Int. J. Mol. Med.

ISSN: 1107-3756

DAY: 27

MONTH: Dec

YEAR: 2005

Endogenous p63 acts as a survival factor for tumour cells of SCCHN origin. Information

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LANGUAGE: eng

NlmUniqueID: 9810955

Endogenous p63 acts as a survival factor for tumour cells of SCCHN origin. Keywords Mesh Terms:

KEYWORDS: X-Rays

MESH TERMS: metabolism

Chemical & Substance for Abstract: Endogenous p63 acts as a survival factor for tumour cells of SCCHN origin. Information

Substance Name: Cisplatin

Registry Number: 15663-27-1

Grant and Affiliation Information for Endogenous p63 acts as a survival factor for tumour cells of SCCHN origin.

AFFILIATION: Department of Medical Biosciences/Pathology, Umeå University, SE - 901 85 Umeå, Sweden. niklas.thurfjell@medbio.umu.se

Country: Greece

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MEDLINETA: Int J Mol Med

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