TY - JOUR
T1 - Unbiased discovery of Glypican as a receptor for LRRTM4 in regulating excitatory synapse development
AU - DeWit, Joris
AU - O'Sullivan, Matthew L.
AU - Savas, Jeffrey N.
AU - Condomitti, Giuseppe
AU - Caccese, Max C.
AU - Vennekens, Kristel M.
AU - Yates, John R.
AU - Ghosh, Anirvan
N1 - Funding Information:
We thank the Ghosh laboratory for discussion and Laura DeNardo, Emily Sylwestrak, and Guido David for critical reading of the manuscript. We thank Katie Tiglio, Christine Wu, Christopher Sanchez, Merve Oney, Joseph Antonios, Tev Stachniak, and Stefanie Otto for help with in situ hybridizations, recombinant protein, and virus production and Stéphane Baudouin (Scheiffele laboratory, Biozentrum, University of Basel) for advice on immunohistochemistry. The LRRTM4 monoclonal antibody N205B/22 was developed with the UC Davis/NIH NeuroMab Facility. Mono- and disaccharide analysis of GPC4-Fc was performed by the UCSD Glycotechnology Core. This work was supported by a NARSAD Young Investigator Award from the Brain and Behavior Research Foundation, an ERC Starting Grant (311083) and FWO Odysseus Grant (J.d.W.), National Institute on Aging NRSA Fellowship 1F32AG039127 (J.N.S.), and NIH grants P41 GM103533, R01 MH067880 (J.R.Y.), and R01 NS064124 and NS067216 (A.G.).
PY - 2013/8/21
Y1 - 2013/8/21
N2 - Leucine-rich repeat (LRR) proteins have recently been identified as important regulators of synapse development and function, but for many LRR proteins the ligand-receptor interactions are not known. Here we identify the heparan sulfate (HS) proteoglycan glypican as a receptor for LRRTM4 using an unbiasedproteomics-based approach. Glypican binds LRRTM4, but not LRRTM2, in an HS-dependent manner. Glypican 4 (GPC4) and LRRTM4 localize to the pre- and postsynaptic membranes of excitatory synapses, respectively. Consistent with a trans-synaptic interaction, LRRTM4 triggers GPC4 clustering in contacting axons and GPC4 induces clustering of LRRTM4 in contacting dendrites in anHS-dependent manner. LRRTM4 positively regulates excitatory synapse development in cultured neurons and invivo, and the synaptogenic activity of LRRTM4 requires the presence of HS on the neuronal surface. Our results identify glypican as an LRRTM4 receptor and indicate that a trans-synaptic glypican-LRRTM4 interaction regulates excitatory synapse development
AB - Leucine-rich repeat (LRR) proteins have recently been identified as important regulators of synapse development and function, but for many LRR proteins the ligand-receptor interactions are not known. Here we identify the heparan sulfate (HS) proteoglycan glypican as a receptor for LRRTM4 using an unbiasedproteomics-based approach. Glypican binds LRRTM4, but not LRRTM2, in an HS-dependent manner. Glypican 4 (GPC4) and LRRTM4 localize to the pre- and postsynaptic membranes of excitatory synapses, respectively. Consistent with a trans-synaptic interaction, LRRTM4 triggers GPC4 clustering in contacting axons and GPC4 induces clustering of LRRTM4 in contacting dendrites in anHS-dependent manner. LRRTM4 positively regulates excitatory synapse development in cultured neurons and invivo, and the synaptogenic activity of LRRTM4 requires the presence of HS on the neuronal surface. Our results identify glypican as an LRRTM4 receptor and indicate that a trans-synaptic glypican-LRRTM4 interaction regulates excitatory synapse development
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U2 - 10.1016/j.neuron.2013.06.049
DO - 10.1016/j.neuron.2013.06.049
M3 - Article
C2 - 23911103
AN - SCOPUS:84882645603
VL - 79
SP - 696
EP - 711
JO - Neuron
JF - Neuron
SN - 0896-6273
IS - 4
ER -