Abstract
Notch signaling plays a crucial role in differentiation and homeostasis in a wide variety of epithelia. The tumor suppressor role of Notch in bladder urothelium is well accepted as the inactivation of this pathway due to damaging mutations in its components is associated with neoplastic transformation. Monitoring Notch signaling is therefore critical to understand how the deregulation of cell-cell communication can lead to differentiation loss and carcinogenesis. In this chapter, we provide a method to visualize active Notch signaling by the detection of the nuclear levels of Notch intracellular domain in mouse urothelium. The technique outlined below is characterized by high sensitivity and specificity and has been successfully applied to human tumor specimens. In this context, this technique could be used to characterize the molecular profile of Notch-deficient tumors and analyze the clonal expansion dynamics and the heterogeneity patterns of Notch inactivation.
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