Abstract | OBJECTIVE:
Atracurium besylate and laudanosine cause excitement and seizures when introduced into the central nervous system of laboratory animals. We examined the modulation of lipid- protein interaction in the lipid environment of rat brain synaptosomal plasma membrane (SPM)-bound enzymes as a possible mechanism leading to these effects. METHODS: RESULTS: The effect of atracurium besylate or laudanosine on Na+/K+-stimulated ATPase activity was biphasic. Maximal enzyme stimulation appeared at 10(-4) M atracurium besylate or 10(-8) M laudanosine, and at 30 min of pre-incubation with both drugs. Arrhenius plots of Na+/K+-stimulated ATPase showed a transition temperature of 23.0 +/- 1.2 degrees C in control SPM and shifted to 16.5 +/- 0.9 degrees C (p < 0.01) in SPM treated with 10(-8) M laudanosine. The Hill coefficients for the allosteric inhibition of Na+/K+-stimulated ATPase by fluoride decreased from 1.99 +/- 0.22 in controls to 1.06 +/- 0.11 (p < 0.001) in the presence of 10(-8) M laudanosine. CONCLUSIONS:
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Authors | E F Kamper, J Siafaka, J Stavridis |
Journal | Intensive care medicine
(Intensive Care Med)
Vol. 24
Issue 5
Pg. 519-25
(May 1998)
ISSN: 0342-4642 [Print] United States |
PMID | 9660270
(Publication Type: Journal Article)
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Chemical References |
- Central Nervous System Agents
- Isoquinolines
- Neuromuscular Depolarizing Agents
- Atracurium
- laudanosine
- 5'-Nucleotidase
- Ca(2+) Mg(2+)-ATPase
- Sodium-Potassium-Exchanging ATPase
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Topics |
- 5'-Nucleotidase
(drug effects)
- Animals
- Atracurium
(pharmacology)
- Brain
(drug effects, enzymology)
- Ca(2+) Mg(2+)-ATPase
(drug effects)
- Cell Membrane
(drug effects, enzymology)
- Central Nervous System Agents
(pharmacology)
- Dose-Response Relationship, Drug
- Isoquinolines
(pharmacology)
- Male
- Neuromuscular Depolarizing Agents
(pharmacology)
- Rats
- Rats, Wistar
- Sodium-Potassium-Exchanging ATPase
(drug effects)
- Synaptosomes
(drug effects, enzymology)
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