Enhanced expression of peroxisome proliferator-activated receptor gamma in epithelial ovarian carcinoma

Zhang, G. Y., Ahmed, N., Riley, C., Oliva, K., Barker, G., Quinn, M. A. and Rice, G. E. (2005) Enhanced expression of peroxisome proliferator-activated receptor gamma in epithelial ovarian carcinoma. British Journal of Cancer, 92 1: 113-119. doi:10.1038/sj.bjc.6602244


Author Zhang, G. Y.
Ahmed, N.
Riley, C.
Oliva, K.
Barker, G.
Quinn, M. A.
Rice, G. E.
Title Enhanced expression of peroxisome proliferator-activated receptor gamma in epithelial ovarian carcinoma
Journal name British Journal of Cancer   Check publisher's open access policy
ISSN 0007-0920
1532-1827
Publication date 2005-01-17
Sub-type Article (original research)
DOI 10.1038/sj.bjc.6602244
Open Access Status DOI
Volume 92
Issue 1
Start page 113
End page 119
Total pages 7
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Abstract The peroxisome proliferator-activated receptors (PPARs) belong to a subclass of nuclear hormone receptor that executes important cellular transcriptional functions. Previous studies have demonstrated the expression of PPARγ in several tumours including colon, breast, bladder, prostate, lung and stomach. This study demonstrates the relative expression of PPARγ in normal ovaries and different pathological grades of ovarian tumours of serous, mucinous, endometrioid, clear cell and mixed subtypes. A total of 56 ovarian specimens including 10 normal, eight benign, 10 borderline, seven grade 1, nine grade 2 and 12 grade 3 were analysed using immunohistochemistry. Immunoreactive PPARγ was not expressed in normal ovaries. Out of eight benign and 10 borderline tumours, only one tumour in each group showed weak cytoplasmic PPARγ expression. In contrast, 26 out of 28 carcinomas studied were positive for PPARγ expression with staining confined to cytoplasmic and nuclear regions. An altered staining pattern of PPARγ was observed in high-grade ovarian tumours with PPARγ being mostly localized in the nuclei with little cytoplasmic immunoreactivity. On the other hand, predominant cytoplasmic staining was observed in lower-grade tumours. Significantly increased PPARγ immunoreactivity was observed in malignant ovarian tumours (grade 1, 2 and 3) compared to benign and borderline tumours (χ2=48.80, P<0.001). Western blot analyses showed significant elevation in the expression of immunoreactive PPARγ in grade 3 ovarian tumours compared with that of normal ovaries and benign ovarian tumours (P<0.01). These findings suggest an involvement of PPARγ in the onset and development of ovarian carcinoma and provide an insight into the regulation of this molecule in the progression of the disease.
Keyword Immunohistochemistry
Nuclear and cytoplasmic staining
Ovarian cancer
Peroxisome proliferator-activated receptor
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: UQ Centre for Clinical Research Publications
Faculty of Medicine
 
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