Stimulus-secretion coupling: a perspective highlighting the contributions of Peter Baker

Area of Science:

• Cell biology
• Neuroscience
• Biochemistry

Background:

• Investigates stimulus-secretion coupling, the process of stimulus-dependent exocytosis.
• Highlights key model systems: motor nerve terminals, adrenal chromaffin cells, sea urchin eggs, and blood platelets.
• Reviews Peter Baker's foundational work on calcium transport in squid giant axons.

Discussion:

• Details contributions to understanding neurotransmitter release and catecholamine secretion.
• Introduces the electropermeabilized cell technique for precise control of cytosolic components.
• Confirms calcium-dependent catecholamine secretion originates from granules, not cytosol.

Key Insights:

• Quantifies calcium requirements for secretory exocytosis.
• Unravels complex second messenger interactions in human platelets.
• Demonstrates the utility of electropermeabilized cells and fluorescent Ca2+ indicators.

Outlook:

• Explores post-secretory events, including membrane retrieval and extracellular medium uptake.
• Suggests future research directions in regulated exocytosis and cellular signaling.
• Emphasizes the lasting impact of Baker's contributions to cell biology.