Abstract
Multiple Endocrine Neoplasia type 1 (MEN1) is a hereditary disease characterised by the occurrence of multiple endocrine tumours. The biological functions of the responsible gene, MEN1, and its encoded protein, menin, remain so far largely elusive. The recent generation of Men1 mutant mice by our group and other laboratories provides powerful tools allowing for the identification of cellular and molecular events that occur after gene disruption. Interestingly, it has been recently reported that p27Kip1 expression is regulated by menin and that decreased p27Kip1 expression can be found in MEN1 insulinomas and parathyroid adenomas. In order to address whether and when p27Kip1 expression alters during insulinoma development in pancreatic β-cell-specific Men1 mutant mice, we analysed p27Kip1 expression in islet lesions from mutant mice at different ages. Our data revealed that p27Kip1 protein expression was reduced in 40 out of 52 (77%) insulinomas analysed, whereas the remaining 12 insulinomas (23%) did not show altered p27Kip1 expression. No difference between the insulinomas with and without decreased p27Kip1 expression could be observed in terms of histological features or menin inactivation. Furthermore, our analysis on hyperplastic and dysplastic islets developed in young mutant mice showed the lack of detectable alteration in p27Kip1 expression, despite evident loss of menin expression in a substantial proportion of islet cells. Our work confirms the altered p27Kip1 expression reported in tumours from MEN1 patients, whereas it suggests that other molecular events may also participate in the tumorigenesis process initiated by the Men1 gene inactivation.
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Abbreviations
- Cre:
-
causes recombination
- MEN1:
-
multiple endocrine neoplasia type 1
- Rip:
-
rat insulin promoter
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Fontanière, S., Casse, H., Bertolino, P. et al. Analysis of p27Kip1 Expression in Insulinomas Developed in Pancreatic β-cell Specific Men1 Mutant Mice. Familial Cancer 5, 49–54 (2006). https://doi.org/10.1007/s10689-005-2575-3
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DOI: https://doi.org/10.1007/s10689-005-2575-3