Glial ephrin-A3 regulates hippocampal dendritic spine morphology and glutamate transport.
Increasing evidence indicates the importance of neuron-glia communication for synaptic function, but the mechanisms involved are not fully understood. We reported that the EphA4 receptor tyrosine kinase is in dendritic spines of pyramidal neurons of the adult hippocampus and regulates spine morphology. We now show that the ephrin-A3 ligand, which is located in the perisynaptic processes of astrocytes, is essential for maintaining EphA4 activation and normal spine morphology in vivo. Ephrin-A3-knockout mice have spine irregularities similar to those observed in EphA4-knockout mice. Remarkably, loss of ephrin-A3 or EphA4 increases the expression of glial glutamate transporters. Consistent with this, glutamate transport is elevated in ephrin-A3-null hippocampal slices whereas Eph-dependent stimulation of ephrin-A3 signaling inhibits glutamate transport. Furthermore, some forms of hippocampus-dependent learning are impaired in the ephrin-A3-knockout mice. Our results suggest that the interaction between neuronal EphA4 and glial ephrin-A3 bidirectionally controls synapse morphology and glial glutamate transport, ultimately regulating hippocampal function.
Carmona
Maria A
MA
Burnham Institute for Medical Research, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA.
Murai
Keith K
KK
Wang
Lei
L
Roberts
Amanda J
AJ
Pasquale
Elena B
EB
D027322:Amino Acid Transport System X-AG / Q000378:metabolism; D000704:Analysis of Variance; D000818:Animals; D001253:Astrocytes / Q000166:cytology / Q000378:metabolism; D001692:Biological Transport; D049229:Dendritic Spines / Q000378:metabolism / Q000502:physiology*; D036384:Ephrin-A3 / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D005971:Glutamates / Q000378:metabolism*; D006624:Hippocampus / Q000166:cytology / Q000378:metabolism; D015151:Immunoblotting; D047468:Immunoprecipitation; D018782:Maze Learning / Q000502:physiology; D008568:Memory / Q000502:physiology; D051379:Mice; D018345:Mice, Knockout; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D009043:Motor Activity / Q000502:physiology; D009457:Neuroglia / Q000378:metabolism*; D010766:Phosphorylation; D017966:Pyramidal Cells / Q000166:cytology / Q000378:metabolism; D036122:Receptor, EphA4 / Q000235:genetics / Q000378:metabolism / Q000502:physiology
D027322:Amino Acid Transport System X-AG; D036384:Ephrin-A3; D005971:Glutamates; D036122:Receptor, EphA4