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• W2080500802 abstract "The model of oncogene-induced senescence (OIS), resulting in cell-proliferation arrest, has recently been suggested as a possible explanation for the non-progression of pituitary tumours to malignancy. The aim of the study was to compare the expression of β-galactosidase as a molecular marker of OIS, and p21/p16 as additional markers involved in mediating OIS, in pituitary adenomas, carcinomas and normal pituitary tissue.We performed: a) semi-quantitative immunohistochemistry (β-galactosidase, p16, p21) in 41 pituitary adenomas [(11 GH-secreting, 9 PRL-secreting, 10 ACTH-secreting, 11 non-functioning (NFPAs)], 6 carcinomas (3 multihormonal: PRL/ACTH/GH, PRL/ACTH, PRL/GH/FSH; 1 non-functioning; 2 ACTH-secreting) and 7 normal pituitary tissues; b) quantitative PCR of mRNA (p16 and p21) in 6 GH-secreting, 6 NFPAs and 6 normal pituitary tissues.β-galactosidase was significantly increased in GH-secreting tumours (P=0.002), NFPAs (P=0.04), macroadenomas (P=0.03) and carcinomas (P=0.02), as compared to normal pituitary tissue. We found that p16 expression was significantly lower in all tumours (both adenomas and carcinomas) probably secondary to reduced transcription, at least for NFPAs; p21 showed a different biological behaviour, implying that p21 and p16 may play different roles in the senescence of each individual type of adenoma.β-galactosidase was significantly over-expressed in GH-secreting and NFPAs, and unexpectedly also in carcinomas. We speculate that the senescence pathway, which may explain the rarity of malignant progression to carcinomas in GH-secreting and NFPAs, might not be universal but cell-type specific." @default.
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• W2080500802 date "2012-07-15" @default.
• W2080500802 modified "2023-09-26" @default.
• W2080500802 title "Oncogene-induced senescence in pituitary adenomas and carcinomas" @default.
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• W2080500802 doi "https://doi.org/10.14310/horm.2002.1358" @default.
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