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The ubiquitin ligase Mdm2 controls oligodendrocyte maturation by intertwining mTOR with G protein-coupled receptor kinase 2 in the regulation of GPR17 receptor desensitization.
- Source :
-
Glia [Glia] 2015 Dec; Vol. 63 (12), pp. 2327-39. Date of Electronic Publication: 2015 Jul 31. - Publication Year :
- 2015
-
Abstract
- During oligodendrocyte precursor cell (OPC) differentiation, defective control of the membrane receptor GPR17 has been suggested to block cell maturation and impair remyelination under demyelinating conditions. After the immature oligodendrocyte stage, to enable cells to complete maturation, GPR17 is physiologically down-regulated via phosphorylation/desensitization by G protein-coupled receptor kinases (GRKs); conversely, GRKs are regulated by the "mammalian target of rapamycin" mTOR. However, how GRKs and mTOR are connected to each other in modulating GPR17 function and oligodendrogenesis has remained elusive. Here we show, for the first time, a role for Murine double minute 2 (Mdm2), a ligase previously involved in ubiquitination/degradation of the onco-suppressor p53 protein. In maturing OPCs, both rapamycin and Nutlin-3, a small molecule inhibitor of Mdm2-p53 interactions, increased GRK2 sequestration by Mdm2, leading to impaired GPR17 down-regulation and OPC maturation block. Thus, Mdm2 intertwines mTOR with GRK2 in regulating GPR17 and oligodendrogenesis and represents a novel actor in myelination.<br /> (© 2015 Wiley Periodicals, Inc.)
- Subjects :
- Animals
Cells, Cultured
Central Nervous System Agents pharmacology
Cerebral Cortex drug effects
Cerebral Cortex physiology
G-Protein-Coupled Receptor Kinase 2 metabolism
Imidazoles pharmacology
Mice, Inbred C57BL
Nerve Tissue Proteins metabolism
Oligodendroglia drug effects
Piperazines pharmacology
Rats, Sprague-Dawley
Receptors, G-Protein-Coupled metabolism
Sirolimus pharmacology
TOR Serine-Threonine Kinases metabolism
Tumor Suppressor Protein p53 metabolism
Oligodendroglia physiology
Proto-Oncogene Proteins c-mdm2 metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1098-1136
- Volume :
- 63
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Glia
- Publication Type :
- Academic Journal
- Accession number :
- 26228571
- Full Text :
- https://doi.org/10.1002/glia.22896