Inhibition of RhoA pathway rescues the endocytosis defects in Oligophrenin1 mouse model of mental retardation

The patho-physiological hypothesis of mental retardation caused by the deficiency of the RhoGAP Oligophrenin1 (OPHN1), relies on the well-known functions of Rho GTPases on neuronal morphology, i.e. dendritic spine structure. Here, we describe a new function of this Bin/Amphiphysin/Rvs domain contain...

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Veröffentlicht in:Human molecular genetics 2009-07, Vol.18 (14), p.2575-2583
Hauptverfasser: Khelfaoui, Malik, Pavlowsky, Alice, Powell, Andrew D., Valnegri, Pamela, Cheong, Kenneth W., Blandin, Yann, Passafaro, Maria, Jefferys, John G.R., Chelly, Jamel, Billuart, Pierre
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container_end_page 2583
container_issue 14
container_start_page 2575
container_title Human molecular genetics
container_volume 18
creator Khelfaoui, Malik
Pavlowsky, Alice
Powell, Andrew D.
Valnegri, Pamela
Cheong, Kenneth W.
Blandin, Yann
Passafaro, Maria
Jefferys, John G.R.
Chelly, Jamel
Billuart, Pierre
description The patho-physiological hypothesis of mental retardation caused by the deficiency of the RhoGAP Oligophrenin1 (OPHN1), relies on the well-known functions of Rho GTPases on neuronal morphology, i.e. dendritic spine structure. Here, we describe a new function of this Bin/Amphiphysin/Rvs domain containing protein in the control of clathrin-mediated endocytosis (CME). Through interactions with Src homology 3 domain containing proteins involved in CME, OPHN1 is concentrated to endocytic sites where it down-regulates the RhoA/ROCK signaling pathway and represses the inhibitory function of ROCK on endocytosis. Indeed disruption of Ophn1 in mice reduces the endocytosis of synaptic vesicles and the post-synaptic α-amino-3-hydroxy-5-methylisoazol-4-propionate (AMPA) receptor internalization, resulting in almost a complete loss of long-term depression in the hippocampus. Finally, pharmacological inhibition of this pathway by ROCK inhibitors fully rescued not only the CME deficit in OPHN1 null cells but also synaptic plasticity in the hippocampus from Ophn1 null model. Altogether, we uncovered a new patho-physiological mechanism for intellectual disabilities associated to mutations in RhoGTPases linked genes and also opened new directions for therapeutic approaches of congenital mental retardation.
doi_str_mv 10.1093/hmg/ddp189
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source Oxford University Press Journals All Titles (1996-Current); MEDLINE; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection
subjects Adult and adolescent clinical studies
Animals
Biological and medical sciences
Cell physiology
Cytoskeletal Proteins
Cytoskeletal Proteins - chemistry
Cytoskeletal Proteins - genetics
Cytoskeletal Proteins - metabolism
Disease Models, Animal
Down-Regulation
Endocytosis
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
GTPase-Activating Proteins
GTPase-Activating Proteins - chemistry
GTPase-Activating Proteins - genetics
GTPase-Activating Proteins - metabolism
Humans
Intellectual deficiency
Intellectual Disability - genetics
Intellectual Disability - metabolism
Intellectual Disability - physiopathology
Life Sciences
Medical sciences
Mental Retardation
Mice
Mice, Inbred C57BL
Mice, Knockout
Molecular and cellular biology
Neurons and Cognition
Nuclear Proteins
Nuclear Proteins - chemistry
Nuclear Proteins - genetics
Nuclear Proteins - metabolism
Protein Binding
Protein Structure, Tertiary
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
rho GTP-Binding Proteins
rho GTP-Binding Proteins - genetics
rho GTP-Binding Proteins - metabolism
Signal Transduction
title Inhibition of RhoA pathway rescues the endocytosis defects in Oligophrenin1 mouse model of mental retardation
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