SCHEPHERD: A modular open-source platform for programmable electric field control for biosciences

Background

The field of bioelectricity explores how endogenous electric fields influence cellular behaviors such as migration, tissue regeneration, and morphogenesis. In particular, electrotaxis—the directed movement of cells in response to direct current (DC) electric fields—has emerged as a critical mechanism in processes like wound healing, immune response, and cancer metastasis. Despite its biological significance, the study of electrotaxis has been hampered by the lack of standardized, scalable, and reproducible experimental platforms. Traditional neuromuscular stimulation equipment is ill-suited for sustained DC stimulation due to the risk of toxic byproducts, and existing custom-built devices are often difficult to reproduce, limiting the field’s ability to generate consistent and comparable data. As a result, there is a pressing need for accessible, high-throughput systems that can deliver precise and programmable DC electric fields to biological samples, thereby accelerating both fundamental research and translational applications in tissue engineering and regenerative medicine.

Current approaches to studying electrotaxis suffer from several technical and methodological limitations. Many systems rely on bespoke, single-use setups that are not easily scalable or compatible with standard laboratory equipment, making parallel experimentation and parameter sweeps labor-intensive and error-prone. The lack of integrated, programmable control over electric field strength and direction further restricts the ability to systematically investigate the nuanced effects of bioelectric cues on cell behavior. Moreover, existing platforms often fail to account for electrode-electrolyte interface resistances, leading to inconsistent field delivery and poor reproducibility. Spatial patterning of electric fields within tissues—a key requirement for studying complex morphogenetic processes—remains largely unaddressed in conventional systems. These shortcomings collectively hinder the exploration of advanced electrotaxis phenomena, such as localized tissue patterning, real-time cytoskeletal dynamics, and multi-dimensional migration control, thereby stalling progress in both basic research and clinical translation.

Technology

SCHEPHERD is a modular, open-source platform designed to precisely control cell migration using programmable direct current (DC) electric fields. It features 3D-printed inserts that fit into standard multiwell plates, where Ag/AgCl electrodes in outer wells are connected to a central sample well via agarose salt bridges, forming a microfluidic-like channel for uniform field generation. The system includes a custom printed-circuit-board lid that integrates electrodes and connects to an 8-channel programmable current source, allowing independent, constant current control (up to 20 mA, 20 V) for each well. This setup enables high-throughput, reproducible DC stimulation, supports advanced two-dimensional electric field control for programming complex migration trajectories, and allows spatial patterning of electric fields within tissues by modifying electrode apertures or the insert’s topography. The platform is validated for a range of experimental models, including large epithelial monolayers, 3D cysts, and transwell systems, and supports real-time imaging and quantitative analysis of cell migration and cytoskeletal dynamics.

What differentiates SCHEPHERD is its comprehensive integration of modular hardware, open-source electronics, and programmable software, which collectively address longstanding challenges in electrotaxis research. Unlike previous systems, SCHEPHERD combines high-throughput capability with precise, independent control of electric field parameters across multiple wells, enabling simultaneous parameter sweeps and complex experimental designs. Its unique ceiling-based electrode design allows for localized spatial patterning of electric fields, providing unprecedented control over tissue migration and morphogenesis at sub-tissue scales. The platform’s compatibility with standard labware, cost-effectiveness, and detailed methods for fabrication and operation ensure accessibility and reproducibility. SCHEPHERD’s ability to program arbitrary migration trajectories and uncover nuanced relationships between electric field strength, migration speed, and directionality positions it as a foundational tool for advancing research in wound healing, tissue engineering, immune modulation, and cancer biology.

Benefits

• Enables high-throughput, reproducible, and programmable control of cell migration using direct current electric fields.
• Modular, 3D-printed inserts fit standard multiwell plates for scalable parallel experiments.
• Provides uniform and stable electric fields with precise current density control via agarose salt bridges and Ag/AgCl electrodes.
• Custom 8-channel programmable current source allows independent stimulation with real-time data logging and safety features.
• Supports advanced two-dimensional electric field control for programming complex migration trajectories and cytoskeletal dynamics.
• Facilitates spatial patterning of electric fields within tissues through electrode aperture design and 3D topographical modulation.
• Validated across diverse experimental models including epithelial monolayers, 3D cysts, and transwell cultures.
• Open-source design promotes standardization, reproducibility, accessibility, and accelerates research in wound healing, immune modulation, and tumor suppression.

Applications

• High-throughput drug screening for electrotaxis
• Programmable tissue engineering and regeneration
• Spatially controlled wound healing studies
• Personalized cancer cell migration assays
• Mechanistic studies of cytoskeletal dynamics

Additional info

This modular, open-source platform precisely controls cell migration using programmable DC electric fields. It integrates 3D-printed multiwell inserts, Ag/AgCl electrodes, and agarose salt bridges with a custom PCB lid. An 8-channel programmable constant current source (up to 20 mA, 20 V) provides independent, reproducible stimulation. This system enables uniform, 2D, and spatially patterned fields for high-throughput parameter sweeps and precise cell trajectory control.