Preferential accumulation of the active S-(+) isomer in murine retina highlights novel mechanisms of vigabatrin-associated retinal toxicity.
Preferential accumulation of the active S-(+) isomer in murine retina highlights novel mechanisms of vigabatrin-associated retinal toxicity.
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DOI:
10.1016/j.eplepsyres.2020.106536
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发表时间:
2021-03
影响因子:
2.2
通讯作者:
Gibson KM
中科院分区:
文献类型:
--
作者:
Walters DC;Jansen EEW;Salomons GS;Arning E;Ashcraft P;Bottiglieri T;Roullet JB;Gibson KM
((S)-(+)/(R)-(−)) vigabatrin (SabrilR; γ-vinyl GABA), an antiepileptic irreversibly inactivating GABA-transaminase, was administered to male C57Bl6J mice via continuous infusion (0, 40, 80 mg/kg/d) for 12 days. Our study design pooled retina, eye (minus retina), whole brain and plasma from n=24 animals for each dose to provide n=8 triplicates per treatment group. Hypothesizing that (S)-(+) VGB (active isomer) would preferentially accumulate in retina, we determined VGB isomers, comprehensive amino acids, and pharmacokinetic parameters. In brain, eye and plasma, the ((S)-(+)/(R)-(−)) ratio varied from 0.73–1.29 and 13.3 in retina, accompanied by a partition coefficient (tissue/plasma, ((S)-(+);(R)-(−))) of 5.8;0.34, 0.63;0.49, and 0.51;0.34 in retina, eye and brain, respectively. Racemic VGB (nmol/g; plasma, nmol/ml, range of means for dose) content was: retina, 25–36; eye (minus retina), 4.8–8.0; brain, 3.1–6.8 and plasma, 8.7–14.9. GABA tissue content (nmol/g) was 1246–3335, 18–64 and 2615–3200 as a function of VGB dose for retina, eye (minus retina) and brain, respectively. The retinal glial cell toxin 2-aminoadipic acid also increased with VGB dose (76–96 nmol/g). Partitioning of active (S)-(+) VGB to retina suggests the involvement of a stereospecific transporter, the identification of which could reveal new therapeutic paradigms that might mitigate VGB’s well-known retinal toxicity and expand its clinical utility.
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影响因子:
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通讯作者:
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影响因子:
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