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p53, a Pivotal Effector of a Functional Cross-Talk Linking Presenilins and Pen-2

The γ-secretase is a multiprotein complex responsible for the ultimate cut yielding amyloid-β peptides and their N-terminal truncated species. This complex is composed of at least four distinct entities, namely presenilin-1 (PS1) or PS2, anterior pharynx defective-1, presenilin enhancer-2 (Pen-2) and nicastrin. Very few studies examined the transcriptional regulation of this complex, and more precisely, whether some of the members functionally interact. Here, we summarize our previous data documenting the fact that Pen-2 controls cell death in a p53-dependent manner and our recent demonstration of a pivotal role of p53 as a regulator of Pen-2 transcription. As PS trigger amyloid precursor protein intracellular domain-dependent regulation of p53, our studies delineate a feedback control mechanism by which PS and Pen-2 functionally interact in a p53-dependent manner.