Wnt pathway inhibitors are strongly down-regulated in pituitary tumors

被引:86
作者
Elston, Marianne S. [3 ]
Gill, Anthony J. [1 ,5 ]
Conaglen, John V. [7 ]
Clarkson, Adele [1 ,5 ]
Shaw, Janet M. [3 ]
Law, Andrew J. J. [8 ]
Cook, Raymond J. [2 ,4 ]
Little, Nicholas S. [2 ,4 ]
Clifton-Bligh, Roderick J. [3 ]
Robinson, Bruce G. [6 ]
McDonald, Kerrie L. [3 ]
机构
[1] Royal N Shore Hosp, Dept Anat Pathol, Sydney, NSW 2065, Australia
[2] Royal N Shore Hosp, Dept Neurosurg, Sydney, NSW 2065, Australia
[3] Royal N Shore Hosp, Kolling Inst Med Res, Canc Genet Unit, Sydney, NSW 2065, Australia
[4] N Shore Private Hosp, Dept Neurosurg, Sydney, NSW 2065, Australia
[5] Univ Sydney, Sydney, NSW 2006, Australia
[6] Fac Med, Sydney, NSW 2006, Australia
[7] Waikato Hosp, Dept Endocrinol, Waikato 3204, New Zealand
[8] Auckland City Hosp, Dept Neurosurg, Auckland 1023, New Zealand
关键词
D O I
10.1210/en.2007-0542
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
The etiology of sporadic pituitary tumors is currently unknown. The Writ pathways have been implicated in the pathogenesis of a variety of human tumors, but the role of these pathways in pituitary tumors is unclear. Microarray analysis using the Affymetrix HG U133 plus 2.0 GeneChips identified four secreted frizzled-related protein (sFRP) family members of Writ pathway inhibitors that were differentially expressed in both nonfunctioning and clinically functioning pituitary tumors (n = 20) compared with normal pituitary controls (n = 3). Reduced tumor expression of Writ inhibitory factor-1 (WIF1), sFRP2, and sFRP4 mRNA was confirmed by real-time quantitative RT-PCR (P < 0.001 and P = 0.002 and 0.013, respectively) in all pituitary subtypes. Hypermethylation of the WIF1 promoter was present in 88% of the pituitary tumors (n = 41). Seventy-six percent of pituitary tumors demonstrated absent or weak cytoplasmic WIF1 staining by immunohistochemistry (n = 41), although preserved staining was seen in some functioning tumors, with strong staining in 92% of normal pituitary controls (n = 13). The Writ pathway target gene cyclin D1 was found to be up-regulated specifically in the nonfunctioning pituitary tumors compared with controls at,; both mRNA and protein level, supportive of activation of the Wnt-beta-catenin pathway. Nuclear accumulation of P-catenin, however, was not observed in any pituitary tumors (n = 70). By transfecting GH3 cells with WIF1, decreased,cell proliferation and colony formation was observed compared with empty vector controls. In conclusion, our data suggest that WIF1 may be a tumor suppressor, specifically in nonfunctioning pituitary tumors, and that the Writ pathways are important in pituitary tumorigenesis.
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页码:1235 / 1242
页数:8
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