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Perspectives in PML: a unifying framework for PML function
Katherine L B Borden1, Biljana Culjkovic
1Institute for Research in Immunology and Cancer and Department of Pathology and Cell Biology, Universite de Montreal, Montreal, Quebec, H4M 1J6 Canada. katherine.borden@umontreal.ca
Abstract:
The promyeloctyic leukemia protein (PML) has established activities as a potent repressor of proliferation, and oncogenic transformation, a promoter of apoptosis, an inducer of senescence, and may act as an inhibitor of angiogenesis in mammalian systems. Loss of PML or its nuclear bodies is associated with many human disease states. At the molecular level, the PML protein, and its associated nuclear bodies, play roles in diverse events ranging from mRNA export to DNA repair. PML expression impacts on Akt survival signaling, p53/Mdm2 activity, and cell cycle progression, to name a few. However, there is no discrete set of molecular activities associated with the PML protein that underlie its biochemical and physiological effects. In this review, we postulate a possible molecular model of PML function that could provide a unifying underpinning for many of its disparate activities. In particular, we explore how the ability of PML to coordinately and combinatorially regulate gene expression post-transcriptionally, enables PML to have such broad ranging effects on cellular physiology.
Insights
The promyelocytic leukemia (PML) protein regulates cell growth, apoptosis, and DNA repair. This review proposes a model where PML
Area of Science:
- Cellular Biology
- Molecular Biology
- Oncology
Background:
- The promyelocytic leukemia (PML) protein exhibits diverse functions including proliferation repression, apoptosis promotion, and senescence induction.
- Loss of PML or its nuclear bodies is linked to various human diseases.
- PML influences critical cellular processes like mRNA export, DNA repair, Akt signaling, p53/Mdm2 activity, and cell cycle progression.
Purpose of the Study:
- To propose a unifying molecular model for PML protein function.
- To explore how PML's post-transcriptional gene regulation contributes to its broad physiological effects.
Main Methods:
- This is a review article, thus no specific experimental methods were employed.
- Literature review and theoretical modeling of PML protein functions.
Main Results:
- A molecular model is postulated to unify the disparate activities of the PML protein.
- PML's ability to coordinately and combinatorially regulate gene expression post-transcriptionally is highlighted as a key mechanism.
Conclusions:
- The proposed model offers a potential unifying framework for understanding PML's diverse roles in cellular physiology.
- Post-transcriptional gene regulation by PML is a critical determinant of its wide-ranging cellular effects.
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