Effect of depolarization on striatal amino acid efflux in perinatal rats: an in vivo microdialysis study.
We used in vivo microdialysis to determine if infusion of depolarizing concentrations of potassium stimulated striatal excitatory amino acid (EAA) efflux in post-natal day (PND) 7 rats. Dialysis probes were perfused with 100 mM KCl for 60 min (n = 6); EAA efflux was unaffected until 40-60 min after onset of the infusion, when a trend towards increased EAA efflux was observed (glutamate 284 +/- 56% of baseline). In animals exposed to 8% oxygen (n = 7) before a more prolonged (100 min) KCl infusion, again over the first 40 min of KCl there were no changes in EAA efflux; subsequently, glutamate, aspartate and taurine efflux increased (peak values 682 +/- 187%, 228 +/- 32%, and 1208 +/- 437% of baseline). These data suggest that in PND 7 rats a substantial contribution to basal striatal EAA efflux may be derived from non-neurotransmitter pools.
Department of Pediatrics, University of Michigan, Ann Arbor 48109.
F S
FS
Silverstein
B
B
Naik
D000596:Amino Acids / Q000378:metabolism*; D000818:Animals; D000831:Animals, Newborn; D003342:Corpus Striatum / Q000378:metabolism* / Q000502:physiology; D003956:Dialysis / Q000379:methods; D004594:Electrophysiology; D000860:Hypoxia / Q000378:metabolism; D009994:Osmolar Concentration; D011189:Potassium Chloride / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains
D000596:Amino Acids; D011189:Potassium Chloride