Glial glutamate transporters mediate a functional metabolic crosstalk between neurons and astrocytes in the mouse developing cortex.
Neuron-glia interactions are essential for synaptic function, and glial glutamate (re)uptake plays a key role at glutamatergic synapses. In knockout mice, for either glial glutamate transporters, GLAST or GLT-1, a classical metabolic response to synaptic activation (i.e., enhancement of glucose utilization) is decreased at an early functional stage in the somatosensory barrel cortex following activation of whiskers. Investigation in vitro demonstrates that glial glutamate transport represents a critical step for triggering enhanced glucose utilization, but also lactate release from astrocytes through a mechanism involving changes in intracellular Na(+) concentration. These data suggest that a metabolic crosstalk takes place between neurons and astrocytes in the developing cortex, which would be regulated by synaptic activity and mediated by glial glutamate transporters.
Voutsinos-Porche
Brigitte
B
CNRS FRE 2363, Paris, France.
Bonvento
Gilles
G
Tanaka
Kohichi
K
Steiner
Pascal
P
Welker
Egbert
E
Chatton
Jean-Yves
JY
Magistretti
Pierre J
PJ
Pellerin
Luc
L
D027322:Amino Acid Transport System X-AG / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D000818:Animals; D000831:Animals, Newborn; D001224:Aspartic Acid / Q000378:metabolism; D001253:Astrocytes / Q000502:physiology*; D015153:Blotting, Western; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000254:growth & development* / Q000502:physiology*; D003847:Deoxyglucose / Q000378:metabolism; D004525:Efferent Pathways / Q000502:physiology; D027342:Excitatory Amino Acid Transporter 2 / Q000235:genetics / Q000378:metabolism; D006019:Glycolysis / Q000502:physiology; D007150:Immunohistochemistry; D019344:Lactic Acid / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009457:Neuroglia / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D010812:Physical Stimulation; D020239:Receptor Cross-Talk / Q000502:physiology*; D013003:Somatosensory Cortex / Q000502:physiology; D013569:Synapses / Q000502:physiology; D014738:Vibrissae / Q000294:innervation / Q000502:physiology
D027322:Amino Acid Transport System X-AG; D027342:Excitatory Amino Acid Transporter 2; D001224:Aspartic Acid; D019344:Lactic Acid; D003847:Deoxyglucose