Spatiotemporal modeling of GPCR signaling: The role of endosomal dynamics and receptor recycling.

Receptor trafficking and endosomal dynamics significantly influence GPCR signaling, with internalized FSHRs producing strong endosomal responses despite low internalization rates.

• Why it matters: Understanding how receptor movement within cells affects signaling is crucial for developing targeted drugs, yet current models often overlook trafficking processes that shape cellular responses.
• What they did: A comprehensive GPCR model was developed that incorporates receptor internalization, endosomal sorting, and recycling, using high-throughput kinetic data from the follicle-stimulating hormone receptor (FSHR) to analyze trafficking effects.
• The result: The model reveals that even minimal internalization can lead to potent endosomal signaling, highlighting the importance of trafficking in drug effects and offering a versatile framework for studying GPCR signaling across different receptors.