毒理性
一部分毒扁豆碱酸会代谢成毒蝇鹅膏醇,这是一种强效的GABAA激动剂,激活大脑主要抑制性神经递质GABA的受体。毒蝇鹅膏醇实际上与GABAA受体复合物上的GABA本身的结合位点相同,与其他GABAergic药物如巴比妥类药物和苯二氮卓类药物不同,后者结合到分离的调节位点上。GABAA受体在大脑中广泛分布,因此当毒蝇鹅膏醇给药时,它会改变多个区域包括大脑皮层、海马和脑干的神经元活动。然而,尽管毒蝇鹅膏醇传统上被认为是一种选择性的GABAA激动剂,它也是GABAC受体的强效部分激动剂,因此其效果概况是这两种目标的作用结果。
A portion of ibotenic acid is metabolized to muscimol, a potent GABAA agonist, activating the receptor for the brain's major inhibitory neurotransmitter, GABA. Muscimol actually binds to the same binding site on the GABAA receptor complex as GABA itself, as opposed to other GABAergic drugs such as barbiturates and benzodiazepines which bind to separate regulatory sites. GABAA receptors are widely distributed in the brain, and so when muscimol is administered, it alters neuronal activity in multiple regions including the cerebral cortex, hippocampus, and cerebellum. However while muscimol is conventionally thought of as a selective GABAA agonist, it is also a potent partial agonist at the GABAC receptor, and so its effects profile results from a combined action at both targets. (L1142, L1672)
来源:Toxin and Toxin Target Database (T3DB)