Notch

Notch simulates Notch–Delta receptor binding and juxtacrine cell–cell signaling using an agent-based model implemented in Unity 3D (version 4.6.1) and Cell Studio to investigate molecular diffusion, endocytosis, filopodium-mediated transport, and emergent cell-surface dynamics.

Key Features:

• Agent-Based Modeling: Represents individual cellular components as discrete agents to simulate interactions between Notch receptors and Delta ligands on neighboring cells.
• Visualization Capabilities: Uses Unity 3D three-dimensional visualization to render real-time molecular diffusion and receptor–ligand interactions at nano- and micro-scales.
• Flexible Geometry Application: Supports application of arbitrary cell geometries to tailor simulations to specific biological scenarios.
• Validation Against Mean-Field Models: Model behavior has been validated through comparison with mean-field models.
• Filopodium-Mediated Signaling Model: Includes a filopodium-mediated signaling scenario that shows diffusion and endocytosis alone can be bottlenecked at cell–filopodium contacts and that active transport of ligands into filopodia enhances signaling.

Scientific Applications:

• Cell Signaling Insights: Investigates mechanisms of Notch–Delta juxtacrine signaling and cell-surface dynamics.
• Biological Scenario Exploration: Allows exploration of parameterized scenarios involving molecular diffusion, endocytosis, and transport to generate and test hypotheses.
• Educational Use: Illustrates concepts of cellular interactions, receptor–ligand dynamics, and filopodium-mediated signaling for teaching purposes.

Methodology:

Implemented as a Unity 3D (version 4.6.1) project using the Cell Studio agent-based modeling system; simulates molecular diffusion, receptor–ligand interactions, endocytosis, and filopodium-mediated active transport and has been validated against mean-field models with three-dimensional visualization via Unity 3D.