title: Evaluation of 4-aminopyridine and 3,4-diaminopyridine penetrability into cerebrospinal fluid in anesthetized rats.
abstract: 4-aminopyridine (4-AP) and 3,4-diaminopyridine (3,4-DAP) when injected intracisternally to anesthetized rats induced qualitatively similar central nervous system stimulant and convulsant effects at equimolar concentrations. Overall penetrability into cerebrospinal fluid of 4-AP is significantly higher than that of 3,4-DAP after single i.v. administration as evaluated by a high-performance liquid chromatographic determination. The present results can account for the lower central nervous system toxicity of 3,4-DAP when compared to 4-AP previously described after systemic administration.
mesh_terms: D015761:4-Aminopyridine; D000077770:Amifampridine; D000631:Aminopyridines / Q000134:cerebrospinal fluid* / Q000494:pharmacology; D000818:Animals; D001812:Blood-Brain Barrier / Q000187:drug effects; D002851:Chromatography, High Pressure Liquid; D007275:Injections, Intravenous; D007276:Injections, Intraventricular; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D012640:Seizures / Q000139:chemically induced
chemical_list: D000631:Aminopyridines; D015761:4-Aminopyridine; D000077770:Amifampridine