ArticlePflugers Archiv : European journal of physiology2025
Neuronal subtype-dependent kinetics of EPSCs induced by thalamocortical projections from the ventroposteromedial thalamic nucleus to the insular cortex in rats.
Article in Pflugers Archiv : European journal of physiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Cerebrocortical neurons receive glutamatergic inputs via thalamocortical projections, and their activities are simultaneously controlled by GABAergic interneurons. Few studies have demonstrated the difference in the amplitude of evoked excitatory postsynaptic currents (EPSCs) via thalamocortical projections onto glutamatergic excitatory (ENs) and GABAergic inhibitory neurons (INs); the strength of excitation among neural subtypes varies among sensory cortices. The present study aimed to reveal the profile of thalamocortical inputs to ENs and inhibitory neurons in the insular cortex (IC) by evaluating the amplitude and latency of EPSCs evoked in the connection from the ventroposteromedial (VPM) thalamic nucleus to the IC. Whole-cell patch-clamp recordings were prepared from ENs, fast-spiking neurons (FSNs), and non-fast-spiking neurons (NFSNs) in the middle layers (layer 4 and adjacent layers) of the IC. Photostimulation-induced EPSCs (pEPSCs) were evoked via the selective activation of thalamocortical axons via optogenetics. All the neuronal subtypes received direct excitatory inputs from the VPM, and pEPSCs recorded from FSNs had the greatest amplitude and shortest latency compared with those recorded from ENs and NFSNs. Under current-clamp conditions, FSNs almost invariably exhibited action potentials responding to photostimulation, whereas ENs and NFSNs often showed the failure of action potential induction. In addition to excitatory inputs, some neurons exhibited pEPSCs followed by outward GABA
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