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Ligand-dependent recruitment of the ErbB4 signaling complex into neuronal lipid rafts.

ABSTRACT: Neuregulin (NRG) regulates synapse formation and synaptic plasticity, but little is known about the regulation of NRG signaling at synapses. Here we show that the NRG receptor ErbB4 was localized in anatomically defined postsynaptic densities in the brain. In cultured cortical neurons, ErbB4 was recruited to the neuronal lipid raft fraction after stimulation by NRG. Along with ErbB4, adaptor proteins Grb2 and Shc were translocated to lipid rafts by NRG stimulation. In transfected human embryonic kidney 293 cells, the partitioning of ErbB4 into a detergent-insoluble fraction that includes lipid rafts was increased by PSD-95 (postsynaptic density-95), through interaction of the ErbB4 C terminus with the PDZ [PSD-95/Discs large/zona occludens-1] domains of PSD-95. Disruption of lipid rafts inhibited NRG-induced activation of Erk and prevented NRG-induced blockade of induction of long-term potentiation at hippocampal CA1 synapses. Thus, our results indicate that NRG stimulation causes translocation of ErbB4 into lipid rafts and that lipid rafts are necessary for signaling by ErbB4.

SUBMITTER: Ma L

PROVIDER: S-EPMC6742330 | biostudies-literature | 2003 Apr

REPOSITORIES: biostudies-literature

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Ligand-dependent recruitment of the ErbB4 signaling complex into neuronal lipid rafts.

Ma Li L Huang Yang Z YZ Pitcher Graham M GM Valtschanoff Juli G JG Ma Ying H YH Feng Lin Y LY Lu Bai B Xiong Wen C WC Salter Michael W MW Weinberg Richard J RJ Mei Lin L

The Journal of neuroscience : the official journal of the Society for Neuroscience 20030401 8

Neuregulin (NRG) regulates synapse formation and synaptic plasticity, but little is known about the regulation of NRG signaling at synapses. Here we show that the NRG receptor ErbB4 was localized in anatomically defined postsynaptic densities in the brain. In cultured cortical neurons, ErbB4 was recruited to the neuronal lipid raft fraction after stimulation by NRG. Along with ErbB4, adaptor proteins Grb2 and Shc were translocated to lipid rafts by NRG stimulation. In transfected human embryonic ...[more]

PMID: 12716924

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Project description:Heterotrimeric guanine nucleotide-binding regulatory proteins (G proteins), composed of G alpha, G beta, and G gamma subunits, are positioned at the inner face of the plasma membrane and relay signals from activated G protein-coupled cell surface receptors to various signaling pathways. G beta 5 is the most structurally divergent G beta isoform and forms tight heterodimers with regulator of G protein signalling (RGS) proteins of the R7 subfamily (R7-RGS). The subcellular localization of G beta 5/R7-RGS protein complexes is regulated by the palmitoylation status of the associated R7-binding protein (R7BP), a recently discovered SNARE-like protein. We investigate here whether R7BP controls the targeting of G beta 5/R7-RGS complexes to lipid rafts, cholesterol-rich membrane microdomains where conventional heterotrimeric G proteins and some effector proteins are concentrated in neurons and brain.We show that endogenous G beta 5/R7-RGS/R7BP protein complexes are present in native neuron-like PC12 cells and that a fraction is targeted to low-density, detergent-resistant membrane lipid rafts. The buoyant density of endogenous raft-associated G beta 5/R7-RGS protein complexes in PC12 cells was similar to that of lipid rafts containing the palmitoylated marker proteins PSD-95 and LAT, but distinct from that of the membrane microdomain where flotillin was localized. Overexpression of wild-type R7BP, but not its palmitoylation-deficient mutant, greatly enriched the fraction of endogenous G beta 5/R7-RGS protein complexes in the lipid rafts. In HEK-293 cells the palmitoylation status of R7BP also regulated the lipid raft targeting of co-expressed G beta 5/R7-RGS/R7BP proteins. A fraction of endogenous G beta 5/R7-RGS/R7BP complexes was also present in lipid rafts in mouse brain.A fraction of G beta 5/R7-RGS/R7BP protein complexes is targeted to low-density, detergent-resistant membrane lipid rafts in PC12 cells and brain. In cultured cells, the palmitoylation status of R7BP regulated the lipid raft targeting of endogenous or co-expressed G beta 5/R7-RGS proteins. Taken together with recent evidence that the kinetic effects of the G beta 5 complex on GPCR signaling are greatly enhanced by R7BP palmitoylation through a membrane-anchoring mechanism, our data suggest the targeting of the G beta 5/R7-RGS/R7BP complex to lipid rafts in neurons and brain, where G proteins and their effectors are concentrated, may be central to the G protein regulatory function of the complex.

Dataset Information

Ligand-dependent recruitment of the ErbB4 signaling complex into neuronal lipid rafts.

Publications

Ligand-dependent recruitment of the ErbB4 signaling complex into neuronal lipid rafts.

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