BrainXell recently partnered with Neuroservices-Alliance to functionally characterize the electrophysiological properties of BrainXell’s human iPSC-derived Sensory Neurons. Human iPSC-derived sensory neurons are an increasingly important model for pain biology and ion-channel research, offering direct human genetic relevance that rodent primary cultures can’t fully replicate , but a model is only as useful as the functional evidence behind it.

This collaboration paired BrainXell’s sensory neuron model with Neuroservices-Alliance’s whole-cell patch-clamp expertise to answer a foundational question: after maturation in vitro, do these neurons actually behave like real sensory neurons, generating action potentials and carrying the voltage-gated sodium currents that define excitable, physiologically relevant cells?

Using whole-cell patch-clamp recording, the study evaluated neuronal membrane properties, intrinsic excitability, action potential firing, and voltage-gated sodium currents following 5–6 weeks of in vitro maturation.

Demonstrating Functional Neuronal Excitability

BrainXell Sensory Neurons displayed key electrophysiological characteristics of functional neurons, including negative resting membrane potentials. Importantly, 85% of neurons tested generated evoked action potentials, with responsive cells producing an average maximum of 12 ± 2 spikes during a one-second current injection.

Voltage-clamp analysis further demonstrated large voltage-gated Na⁺ currents, reaching 12,363 ± 1,377 pA under the CsCl/CsF recording condition. Most of the measured sodium current was TTX-sensitive, while approximately 14% was TTX-resistant, adding further functional characterization of the ion-channel activity present in the model.

Combining Human-Relevant Models with Specialized Electrophysiology

These findings provide additional characterization of BrainXell Sensory Neurons and demonstrate their ability to develop functional neuronal properties and stimulus-evoked activity following maturation. The collaboration also highlights the complementary capabilities of BrainXell and Neuroservices-Alliance: combining human iPSC-derived sensory neuron models with specialized electrophysiological characterization to support pain biology, ion-channel research, and preclinical drug discovery. Neuroservices-Alliance specifically supports electrophysiological characterization of human iPSC-derived neurons and pain-relevant targets including TRPV1 and NaV1.7/1.8/1.9.

Conclusion

Together, these results confirm that BrainXell Sensory Neurons develop the hallmark functional properties of mature, excitable neurons after 5–6 weeks in vitro — from stable negative resting membrane potentials to robust, repeatable action potential firing and large, predominantly TTX-sensitive sodium currents. That functional validation is what turns a promising iPSC-derived model into a dependable tool for pain and ion-channel research. This partnership reflects the complementary strengths each organization brings: BrainXell’s human-relevant sensory neuron platform paired with Neuroservices-Alliance’s specialized electrophysiological characterization of pain-relevant targets, including TRPV1 and NaV1.7/1.8/1.9. Interested in applying BrainXell Sensory Neurons to your own research?

Reach out to our team to learn more about the model and the opportunities for functional characterization it opens up.