毒理性
震颤原性真菌毒素通过干扰神经递质的释放来发挥其毒性作用,可能是通过导致神经末梢的变性。它们被认为可以抑制γ-氨基丁酸(GABA)受体,包括突触前和突触后的,同时还可以抑制GABA-T受体的递质分解。这最初会增加神经递质的水平,增强GABA诱导的氯离子电流,然后导致突触中神经递质水平的降低。此外,高粱碱抑制平滑肌中突触前的高电导钙激活大K+通道。(A2976, A2993)
Tremorgenic mycotoxins exert their toxic effects by interfering with neurotransmitter release, possibly by causing degeneration of nerve terminals. They are thought to inhibit gamma-aminobutyric acid (GABA) receptors, both pre- and postsynaptic, as well as inhibit transmitter breakdown at the GABA-T receptors. This would initially increase neurotransmitter levels, potentiating the GABA-induced chloride current, then lead to decreased levels of neurotransmitter in the synapse. In addition, paspalicine inhibits presynaptic high-conductance Ca+2 activated maxi-K+ channels in the smooth muscle. (A2976, A2993)
来源:Toxin and Toxin Target Database (T3DB)