Molecular investigation of ergot alkaloid ergotamine's modulatory effects on glycine receptors expressed in Xenopus oocytes

The relationship between oxidative stress and glycine receptors is complex, involving multiple mechanisms through which reactive oxygen species can modify glycine receptor function. Understanding these interactions is essential for developing therapeutic strategies to mitigate the effects of oxidative stress on inhibitory neurotransmission in various neurological disorders. Inhibitory glycine receptors play a critical role in regulating the final grand postsynaptic potential by attenuating excitatory postsynaptic potentials through inhibitory postsynaptic potentials in postsynaptic neurons. This is particularly important in rapid signal transmission systems, where it determines whether the grand postsynaptic potential exceeds the activation threshold. Glycine receptors are known to be expressed not only in the spinal cord and brainstem but also in the hippocampus, as evidenced by studies conducted over the past decade. Interestingly, these regions share a common cellular architecture, predominantly composed of pyramidal neurons. In hippocampal pyramidal neurons, glycine receptors contribute to the regulation of synapse formation and plasticity, and they are crucial in motor neuron control within the pyramidal tract. However, there is limited research on glycine receptor antagonism, which is necessary to fully understand their biological functions in these regions. We conducted a comprehensive molecular-level analysis of the pharmacological properties of glycine receptors, examined their interaction mechanisms through electrophysiological studies, and identified binding sites using structural modeling and site-directed mutagenesis. Our findings suggest that ergotamine may serve as a promising antioxidant candidate to address issues associated with excessive or prolonged inhibitory postsynaptic potentials, offering a potential new therapeutic pathway.