open access

Vol 54, No 3 (2016)
Brief communication
Submitted: 2016-07-29
Accepted: 2016-08-17
Published online: 2016-08-19
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Decreased expression of p73 in colorectal cancer

Anna Kotulak, Agata Wronska, Jaroslaw Kobiela, Janusz Godlewski, Marcin Stanislawowski, Piotr Wierzbicki
DOI: 10.5603/FHC.a2016.0018
·
Pubmed: 27654017
·
Folia Histochem Cytobiol 2016;54(3):166-170.

open access

Vol 54, No 3 (2016)
Short Communication
Submitted: 2016-07-29
Accepted: 2016-08-17
Published online: 2016-08-19

Abstract

Introduction. The colorectal cancer (CRC) is one of the most frequent cancer in Poland and worldwide. This disease is characterized by distinct genetic alterations. p73 belongs to the p53 gene family; however, its role in the pathogenesis of CRC has not been completely understood. p73 gene encodes several mRNA variants and protein isoforms with its longest and fully functional p73a (mRNA) and TAp73a (protein) isoform. The aim of the study was to investigate p73 gene expression at the mRNA (p73a) and protein (TAp73a) levels in CRC.

Material and methods. Small sections of the crc tumor tissue and macroscopically unchanged colon mucosa and submucosa from the dissection margin were collected from 23 patients diagnosed with CRC. p73 mRNA levels were measured by Real-time PCR (QPCR) method and the expression level of TAp73a protein was assessed by Western blotting (WB) and immunohistochemical (IHC) staining.

Results. We found a 37% decrease in the level of p73a mRNA in neoplastically changed (tumor) compared with unchanged normal colon tissue from the surgical margin (p = 0.041). No correlations were found between mRNA levels in cancer tissue and clinical-pathological parameters. The semi-quantification of TAp73a protein revealed lower and higher TAp73a protein contents in 11/23 and 12/23 of tumor samples, respectively, when compared with the median value of TAp73a protein in normal colon tissue (p = 0.61). The level of TAp73a protein level was 5 times lower in poorly differentiated cancer cells (G3) in comparison to moderately differentiated ones (G2; p = 0.02). No statistically significant correlations were observed between the level of the TAp73a protein and clinical-pathological patients’ characteristics. The IHC analysis of TAp73a protein presence in CRC samples showed decreased immunoreactivity when compared with matched sections of the unchanged colon wall in 4/9 patients, similar intensity of the IHC reaction in 4/9 patients and increased immunoreactivity in 1/9 patients. The TAp73a protein was localized mainly in the cytoplasm of the cancer cells. No statistically significant correlations between IHC results and clinical-pathological features of the patients were found.

Conclusions. The obtained results suggest that the p73 gene may play a role as a tumor suppressor in the CRC progression.

Abstract

Introduction. The colorectal cancer (CRC) is one of the most frequent cancer in Poland and worldwide. This disease is characterized by distinct genetic alterations. p73 belongs to the p53 gene family; however, its role in the pathogenesis of CRC has not been completely understood. p73 gene encodes several mRNA variants and protein isoforms with its longest and fully functional p73a (mRNA) and TAp73a (protein) isoform. The aim of the study was to investigate p73 gene expression at the mRNA (p73a) and protein (TAp73a) levels in CRC.

Material and methods. Small sections of the crc tumor tissue and macroscopically unchanged colon mucosa and submucosa from the dissection margin were collected from 23 patients diagnosed with CRC. p73 mRNA levels were measured by Real-time PCR (QPCR) method and the expression level of TAp73a protein was assessed by Western blotting (WB) and immunohistochemical (IHC) staining.

Results. We found a 37% decrease in the level of p73a mRNA in neoplastically changed (tumor) compared with unchanged normal colon tissue from the surgical margin (p = 0.041). No correlations were found between mRNA levels in cancer tissue and clinical-pathological parameters. The semi-quantification of TAp73a protein revealed lower and higher TAp73a protein contents in 11/23 and 12/23 of tumor samples, respectively, when compared with the median value of TAp73a protein in normal colon tissue (p = 0.61). The level of TAp73a protein level was 5 times lower in poorly differentiated cancer cells (G3) in comparison to moderately differentiated ones (G2; p = 0.02). No statistically significant correlations were observed between the level of the TAp73a protein and clinical-pathological patients’ characteristics. The IHC analysis of TAp73a protein presence in CRC samples showed decreased immunoreactivity when compared with matched sections of the unchanged colon wall in 4/9 patients, similar intensity of the IHC reaction in 4/9 patients and increased immunoreactivity in 1/9 patients. The TAp73a protein was localized mainly in the cytoplasm of the cancer cells. No statistically significant correlations between IHC results and clinical-pathological features of the patients were found.

Conclusions. The obtained results suggest that the p73 gene may play a role as a tumor suppressor in the CRC progression.

Get Citation

Keywords

p73; colorectal cancer; QPCR; Western blotting; immunohistochemistry

About this article
Title

Decreased expression of p73 in colorectal cancer

Journal

Folia Histochemica et Cytobiologica

Issue

Vol 54, No 3 (2016)

Article type

Brief communication

Pages

166-170

Published online

2016-08-19

DOI

10.5603/FHC.a2016.0018

Pubmed

27654017

Bibliographic record

Folia Histochem Cytobiol 2016;54(3):166-170.

Keywords

p73
colorectal cancer
QPCR
Western blotting
immunohistochemistry

Authors

Anna Kotulak
Agata Wronska
Jaroslaw Kobiela
Janusz Godlewski
Marcin Stanislawowski
Piotr Wierzbicki

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