Nuclear phosphoinositide specific phospholipase C (PI-PLC)-beta 1: a central intermediary in nuclear lipid-dependent signal transduction.
Several studies have demonstrated the existence of an autonomous intranuclear phospho-inositide cycle that involves the activation of nuclear PI-PLC and the generation of diacylglycerol (DG) within the nucleus. Although several distinct isozymes of PI-PLC have been detected in the nucleus, the isoform that has been most consistently highlighted as being nuclear is PI-PLC-beta1. Nuclear PI-PLC-beta1 has been linked with either cell proliferation or differentiation. Remarkably, the activation mechanism of nuclear PI-PLC-beta1 has been shown to be different from its plasma membrane counterpart, being dependent on phosphorylation effected by p44/42 mitogen activated protein (MAP) kinase. In this review, we report the most up-dated findings about nuclear PI-PLC-beta1, such as the localization in nuclear speckles, the activity changes during the cell cycle phases, and the possible involvement in the progression of myelodisplastic syndrome to acute myeloid leukemia.
Martelli
A M
AM
Department of Human Anatomical Sciences and Muscoloskeletal System Physiopathology, Section of Human Anatomy, Cell Signalling Laboratory, University of Bologna, Italy. amartell@biocfarm.unibo.it
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D000595:Amino Acid Sequence; D000818:Animals; D002453:Cell Cycle / Q000502:physiology; D002467:Cell Nucleus / Q000737:chemistry / Q000201:enzymology*; D006801:Humans; D007527:Isoenzymes / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D008055:Lipids / Q000502:physiology*; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology; D054799:Phospholipase C beta; D015398:Signal Transduction / Q000502:physiology*; D010738:Type C Phospholipases / Q000737:chemistry / Q000235:genetics / Q000502:physiology*
D007527:Isoenzymes; D008055:Lipids; D009363:Neoplasm Proteins; D010738:Type C Phospholipases; C518033:PLCB1 protein, human; D054799:Phospholipase C beta