Protective Effects of Bupivacaine against Kainic Acid-Induced Seizure and Neuronal Cell Death in the Rat Hippocampus

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  • Chiu Kuan Ming
    Division of Cardiovascular Surgery, Cardiovascular Center, Far-Eastern Memorial Hospital Department of Nursing, Oriental Institute of Technology
  • Wu Chia Chan
    Department of Anesthesiology, Far-Eastern Memorial Hospital
  • Wang Ming Jiuh
    Department of Anesthesiology, National Taiwan University Hospital
  • Lee Ming Yi
    Division of Cardiovascular Surgery, Cardiovascular Center, Far-Eastern Memorial Hospital
  • Wang Su Jane
    Graduate Institute of Basic Medicine School of Medicine, Fu Jen Catholic University

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The excessive release of glutamate is a critical element in the neuropathology of epilepsy, and bupivacaine, a local anesthetic agent, has been shown to inhibit the release of glutamate in rat cerebrocortical nerve terminals. This study investigated whether bupivacaine produces antiseizure and antiexcitotoxic effects using a kainic acid (KA) rat model, an animal model used for temporal lobe epilepsy, and excitotoxic neurodegeneration experiments. The results showed that administering bupivacaine (0.4 mg/kg or 2 mg/kg) intraperitoneally to rats 30 min before intraperitoneal injection of KA (15 mg/kg) increased seizure latency and reduced the seizure score. In addition, bupivacaine attenuated KA-induced hippocampal neuronal cell death, and this protective effect was accompanied by the inhibition of microglial activation and production of proinflammatory cytokines such as interleukin (IL)-1β, IL-6, and tumor necrosis factor-α in the hippocampus. Moreover, bupivacaine shortened the latency of escaping onto the platform in the Morris water maze learning performance test. Collectively, these data suggest that bupivacaine has therapeutic potential for treating epilepsy.

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