Abstract:Although older studies have reported elevated plasma taurine concentrations, more recent studies have reported the same or lower plasma taurine concentrations in epileptic than in control subjects. The present study determined plasma taurine concentrations in 114 epileptic and 99 control subjects. In addition, taurine concentrations in platelets, known to be rich in taurine, were assayed. Serum drug concentrations were also determined to detect possible effects on plasma or platelet taurine concentrations. The… Show more
“…But later (van Gelder et al., 1983; Dolina et al., 1993), amino acid concentrations were viewed as being in delicate balance, and an increase in glutamic acid concentration in combination with failure of GABA inhibition was considered the most plausible explanation for hyperexcitability. Only the content of taurine was often shown to be increased; indeed, the role of taurine is still unclear (van Gelder et al., 1977;Airaksinen, 1979; Bonhaus et al., 1984; Goodman et al., 1989; Gupta et al., 2005).…”
Section: The Second Half Of the Ilae Centurymentioning
SUMMARYThis paper gives an account of the global evolution of (neuro-)chemistry in epileptology with an emphasis on the role of the International League Against Epilepsy (ILAE), which declared in its constitution a mission ''to make the epilepsy-problem the object of special study and to make practical use of the results of such study.'' As Epilepsia is the scientific journal of the ILAE, the review emphasizes papers published in the journal.
“…But later (van Gelder et al., 1983; Dolina et al., 1993), amino acid concentrations were viewed as being in delicate balance, and an increase in glutamic acid concentration in combination with failure of GABA inhibition was considered the most plausible explanation for hyperexcitability. Only the content of taurine was often shown to be increased; indeed, the role of taurine is still unclear (van Gelder et al., 1977;Airaksinen, 1979; Bonhaus et al., 1984; Goodman et al., 1989; Gupta et al., 2005).…”
Section: The Second Half Of the Ilae Centurymentioning
SUMMARYThis paper gives an account of the global evolution of (neuro-)chemistry in epileptology with an emphasis on the role of the International League Against Epilepsy (ILAE), which declared in its constitution a mission ''to make the epilepsy-problem the object of special study and to make practical use of the results of such study.'' As Epilepsia is the scientific journal of the ILAE, the review emphasizes papers published in the journal.
“…This may be related to one of their mechanisms of antiepileptic action. In epileptic patients, plasma and urinary taurine levels are reduced (Goodman et al ., 1989; Hartley et al ., 1989). Taurine is also an active anticonvulsant in a variety of animal models and in some epileptic patients (Bonhaus et al ., 1983).…”
1 The purpose of this study was to synthesize novel valproyltaurine (VTA) derivatives including valproyltaurinamide (VTD), N-methyl-valproyltaurinamide (M-VTD), N,N-dimethyl-valproyltaurinamide (DM-VTD) and N-isopropyl-valproyltaurinamide (I-VTD) and evaluate their structurepharmacokinetic -pharmacodynamic relationships with respect to anticonvulsant activity and teratogenic potential. However, their hepatotoxic potential could not be evaluated. The metabolism and pharmacokinetics of these derivatives in mice were also studied. 2 VTA lacked anticonvulsant activity, but VTD, DM-VTD and I-VTD possessed anticonvulsant activity in the Frings audiogenic seizure susceptible mice (ED 50 values of 52, 134 and 126 mg kg À1 , respectively). 3 VTA did not have any adverse effect on the reproductive outcome in the Swiss Vancouver/Fnn mice following a single i.p. injection of 600 mg kg À1 on gestational day (GD) 8.5. VTD (600 mg kg À1 at GD 8.5) produced an increase in embryolethality, but unlike valproic acid, it did not induce congenital malformations. DM-VTD and I-VTD (600 mg kg À1 at GD 8.5) produced a significant increase in the incidence of gross malformations. The incidence of birth defects increased when the length of the alkyl substituent or the degree of N-alkylation increased. 4 In mice, N-alkylated VTDs underwent metabolic N-dealkylation to VTD. DM-VTD was first biotransformed to M-VTD and subsequently to VTD. I-VTD's fraction metabolized to VTD was 29%. The observed metabolic pathways suggest that active metabolites may contribute to the anticonvulsant activity of the N-alkylated VTDs and reactive intermediates may be formed during their metabolism. In mice, VTD had five to 10 times lower clearance (CL), and three times longer halflife than I-VTD and DM-VTD, making it a more attractive compound than DM-VTD and I-VTD for further development. VTD's extent of brain penetration was only half that observed for the Nalkylated taurinamides suggesting that it has a higher intrinsic activity that DM-VTD and I-VTD. 5 In conclusion, from this series of compounds, although VTD caused embryolethality, this compound emerged as the most promising new antiepileptic drug, having a preclinical spectrum characterized by the highest anticonvulsant potential, lowest potential for teratogenicity and favorable pharmacokinetics.
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