News Life

Astrocytes are rising stars

Often-ignored brain cells regulate blood flow and make fMRI possible

By Tina Hesman Saey

- More than 2 years ago

Star-shaped brain cells called astrocytes are finally getting their chance to shine.

Astrocytes (purple) and neurons (green) in the visual cortex of a ferret. The cells contain dyes that allow researchers to track calcium levels. When neurons are active, astrocytes respond with increased calcium, which leads nearby capillaries to increase blood flow. This is a previously undiscovered role for astrocytes, once thought to only act as support cells for neurons.
STAR PLAYERS Astrocytes (purple) and neurons (green) in the visual cortex of a ferret. The cells contain dyes that allow researchers to track calcium levels. When neurons are active, astrocytes respond with increased calcium, which leads nearby capillaries to increase blood flow.