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- W2035521330 abstract "These results show for the first time that the RAS/RAF/ERK1/2 MAPK signalling pathway is active and involved in p21-mediated cell cycle arrest in human cholesteatoma epithelium.In a previous report we have demonstrated that the epithelium in human cholesteatoma is characterized by high p53-dependent p21 expression. The RAS/RAF/extracellular signal-regulated kinase (ERK)1/2 mitogen-activated protein kinase (MAPK) signalling pathway can induce p21 expression and subsequent cell cycle arrest via p53-dependent or -independent mechanisms. We designed the present study to investigate whether the RAS/RAF/ERK1/2 MAPK signalling pathway is involved in p53-dependent and p21-mediated cell cycle arrest in human cholesteatoma.A total of 18 cholesteatoma samples and 18 paired control retro-auricular skin samples were immunohistochemically stained for p53, p21, phosphorylated ERK1/2 (pERK1/2) and total ERK1/2. Positive cells were counted by means of digital image analysis. Double-label fluorescence immunohistochemistry was performed to demonstrate co-expression of p21 and pERK1/2.Protein expression of p53, p21 and pERK1/2 differed significantly between cholesteatoma epithelium and retro-auricular skin (p <0.01). In cholesteatoma, co-expression of p21 and pERK1/2 was prominent, whereas in retro-auricular skin there was hardly any co-expression. Positive correlations were found between p53 and p21 (p =0.003) and between p21 and pERK1/2 (p =0.013)." @default.
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- W2035521330 date "2005-02-01" @default.
- W2035521330 modified "2023-10-13" @default.
- W2035521330 title "Sustained extracellular signal-regulated kinase1/2 mitogen-activated protein kinase signalling is related to increased p21 expression in cholesteatoma epithelium" @default.
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- W2035521330 doi "https://doi.org/10.1080/00016480410022813" @default.
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