Kleinhaus A L, Prichard J W
J Neurobiol. 1976 Jul;7(4):371-6. doi: 10.1002/neu.480070408.
Postsynaptic potentials (PSPs) recorded from leech Retzius cells in response to stimulation of interganglionic connective could not be reversed by soma depolarization or abolished by 40 mM Mg ion, nor could input resistance changes be detected during them. Alteration of external Cl and K over a tenfold range provided no clear evidence that the PSPs involved a conductance change to either ion. The method of extrapolation yielded an apparent PSP equilibrium potential of about -20 mV. The steep portion of the relationship between Retzius cell action potential amplitude and membrane potential extrapolated to an apparent reversal potential of -13 mV. It is likely that the connective-to-Retzius cell PSPs were principally electrical events. Their apparent reversal potentials could have been in the range associated with chemical synapses because they traversed an electrical synapse with a variable coupling resistance, or because the polarizing currents, passing "backwards" across electrical synapses, changed the amplitude of the presynaptic action potentials.
从水蛭Retzius细胞记录到的突触后电位（PSP），在对神经节间结缔组织进行刺激时，不会因胞体去极化而反转，也不会被40 mM的镁离子消除，并且在记录过程中也未检测到输入电阻的变化。将外部氯离子和钾离子的浓度在十倍范围内改变，并未提供明确证据表明PSP涉及对任何一种离子的电导变化。外推法得出的PSP表观平衡电位约为 -20 mV。Retzius细胞动作电位幅度与膜电位之间关系的陡峭部分外推至表观反转电位为 -13 mV。结缔组织到Retzius细胞的PSP很可能主要是电事件。它们的表观反转电位可能处于与化学突触相关的范围内，这是因为它们通过具有可变耦合电阻的电突触，或者因为极化电流“反向”穿过电突触，改变了突触前动作电位的幅度。
