Connexin proteins rally arteries to nourish brain on demand , Pg11

Key Highlights:

• Connexin proteins in artery walls facilitate rapid communication for brain nourishment on demand.
• Neurovascular coupling, the process of matching blood flow to neuronal activity, relies on quick signals.
• Cx37 and Cx40, two connexin proteins, are abundant in arteries and crucial for this rapid signaling.
• Experiments on mice lacking Cx37 and Cx40 showed significantly slower arterial response to brain activity.
• The study, published in Cell in July, highlights the importance of gap junctions in brain function.

Detailed Insights:

• Neurovascular coupling ensures that active neurons receive immediate fuel without affecting neighboring regions.
• Gap junctions, narrow portals between cells, allow for the exchange of ions and small molecules.
• The Harvard team's research demonstrated that signals travel along vessel walls via connexin proteins.
• Mice lacking Cx37 and Cx40 exhibited slower and weaker widening action in arteries during brain activity.
• This research could aid in developing computer models to detect vascular problems and test drugs virtually.
• Understanding the mechanism and speed of vessel-widening signals is crucial for linking brain activity to blood flow.
• The study may also provide insights into diseases where gap junction connections are compromised, affecting brain blood flow.

Scientific/Technical Concepts Involved:

• Neurovascular Coupling: The process by which neuronal activity is matched with corresponding changes in cerebral blood flow.
• Gap Junctions: Specialized intercellular connections that directly connect the cytoplasm of two cells, allowing passage of molecules.
• Connexin Proteins: A family of structurally related transmembrane proteins that assemble to form gap junctions between cells.