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학술저널
저자정보
신현정 (분당서울대학교병원 마취통증의학과) Lee Soo-Young (ThanQ Seoul Thyroid-Head & Neck Surgery Center) 나효석 (분당서울대학교병원) 구본욱 (분당서울대학교병원) 유정희 (서울대학교) 도상환 (서울대학교)
저널정보
대한마취통증의학회(구 대한마취과학회) Anesthesia and Pain Medicine Anesthesia and Pain Medicine Vol.15 No.3
발행연도
2020.1
수록면
291 - 296 (6page)

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Background: Tranexamic acid (TXA) is the most widely used hemostatic agent in surgical patients. However, when used in a high dose, it could cause a seizure in the postoperative period. The exact effector mechanism behind the seizure triggering remains unknown. Therefore, the authors investigated the effects of TXA on the activity of glutamate transporter type 3 (excitatory amino acid transporter 3; EAAT3), which is the main neuronal glutamate transporter type. Methods: EAAT3 was expressed in Xenopus laevis oocytes through mRNA injection. Oocytes were incubated with diluted tranexamic acid for 72 h. Two-electrode voltage clamping was used to measure membrane currents before, during, and after applying 30 M L-glutamate. Responses were quantified by integrating the current traces and reported in microcoulombs (C). Results were presented as mean  SEM.Results: TXA (30 to 1,000 M) significantly decreased EAAT3 activity. Our kinetic study showed that Vmax was significantly decreased in the TXA group compared with the control group (1.1  0.1 vs. 1.4  0.1 C, n = 18–23, P = 0.043), but the Km did not significantly change (12.7  3.9 M for TXA vs. 12.8  3.8 for control, n = 18–23, P = 0.986).Conclusions: Our results suggest that TXA attenuates EAAT3 activity, which may explain its proconvulsant effect.

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