Endobain E, a brain Na+, K+ -ATPase inhibitor, decreases norepinephrine uptake in rat hypothalamus.
The ability of an endogenous brain Na+, K+ -ATPase inhibitor, termed endobain E, to increase [3H]norepinephrine release in rat hypothalamus was previously reported. Endobain E effect on neurotransmitter uptake was studied by assaying [3H]norepinephrine uptake in rat hypothalamus preparations, to observe uptake inhibition, which reached 60% with endobain E equivalent to 100 mg fresh cerebral cortex, an effect achieved with 40 or 400 microM ouabain. Results support the proposal that endobain E behaves as an ouabain-like substance. Taken jointly results obtained on neurotransmitter release and uptake, the suggestion that endobain E may enhance norepinephrine availability in the synaptic gap and thus lead to an increase in noradrenergic activity is advanced.
Vatta
Marcelo
M
Cátedra de Fisiología-IQUIMEFA, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113-Buenos Aires, Argentina.
Peña
Clara
C
Fernández
Belisario E
BE
Rodríguez de Lores Arnaiz
Georgina
G
D000818:Animals; D004305:Dose-Response Relationship, Drug; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D007031:Hypothalamus / Q000187:drug effects* / Q000378:metabolism; D066298:In Vitro Techniques; D008297:Male; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D009638:Norepinephrine / Q000378:metabolism*; D010042:Ouabain / Q000031:analogs & derivatives* / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D000254:Sodium-Potassium-Exchanging ATPase / Q000037:antagonists & inhibitors*; D014316:Tritium
D004791:Enzyme Inhibitors; C119205:endobain E; D014316:Tritium; D010042:Ouabain; D000254:Sodium-Potassium-Exchanging ATPase; D009638:Norepinephrine