Abstract
Cholesteatoma is a benign disease characterized by the presence of an unrestrained growth and the accumulation of keratin in the middle ear cavity. Due to roles in cell proliferation, apoptosis and differentiation members of the protein kinase C (PKC) family could be involved in disease progression. This study focuses on the expression of protein kinase C-alpha, -delta, -eta, -gamma and -zeta in the epithelial tissues of 56 human cholesteatomas and their correlations with those of previously characterized distributions of p53, galectin-3, retinoic acid receptor-beta (RARbeta) and macrophage migration inhibitory factor (MIF). We have previously reported this marker set to be correlated with keratinocyte differentiation in human cholesteatomas. Our present data clearly show that the percentage of PKC-alpha (but not PKC-delta, -gamma, -eta and -zeta)-immunopositive cells in epithelial tissue fro recurrent cholesteatomas was significantly higher than in non-recurrent cases. Correlations between the PKC isoenzymes and the biological markers were non-uniform. PKC-alpha (but not PKC-delta, -gamma, -eta and -zeta) expression in epithelial cholesteatoma cells correlated significantly and positively with the percentages of p53-immunoposi...Continue Reading
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