Microfluidic Co-Culture of iPSC- Derived Sensory Neurons and Human Melanocytes for Neurocutaneous Toxicology.

Microfluidic Co-Culture of iPSC-Derived Sensory Neurons and Human Melanocytes for Neurocutaneous Toxicology.

<Synopsis> This study establishes a compartmentalized microfluidic platform to investigate the physiological crosstalk between sensory neurons and melanocytes, mimicking the in vivo neurocutaneous interface.

Background

Melanocytes and peripheral sensory neurons share a common embryonic lineage, both arising from neural crest cells. The goal of this study was to develop a controlled, compartmentalized microfluidic model to investigate the reciprocal molecular influences and melanogenic signaling pathways between these two cell types.

Key Challenges

Media Incompatibility: iPSC-derived sensory neurons and melanocytes have distinct media requirements, making standard co-culture technically challenging.
Technical Complexity: Studying these specific cellular interactions in vitro requires a system that can isolate cell bodies while allowing neurite interaction.

Our Approach

Our team utilized the NETRI DUALINK plate to create a compartmentalized environment.

Neuronal Growth: iPSC-derived neural crest cells were differentiated into sensory neurons in Channel 1.
Directed Migration: Sensory neurites migrated through specific microchannels into an adjacent compartment.
Melanocyte Seeding: Once neuritic extensions were established, primary human epidermal melanocytes were seeded in Channel 3 to allow for direct interaction.

Results

Gene Up-regulation: Relative gene expression analysis indicated an up-regulation of the tripartite complex genes (MLPH, MYO5A, RAB27A) in co-culture conditions.
Pigmentation Pathways: Increased expression of MITF indicated increased transcription of genes related to the secretory pathway and pigmentation.
Physical Interaction: Immunofluorescence confirmed that sensory neurites successfully traveled through microchannels to interact with melanocytes in the adjacent channel.

Impact

Toxicology Platform: The system serves as an advanced platform for evaluating neurocutaneous toxic effects and screening for drug-induced pigment loss.
Mechanistic Insight: The observed neurite-dependent melanogenic activation highlights how neurotoxicants or drugs could alter pigmentation via neuronal influence.
Physiological Relevance: By enabling hetero-cellular interaction, the model closely mimics in vivo conditions to study factors promoting melanocyte over-activity.