Glucocorticoids and Astrocytes (IMAGE) University of California - Berkeley Caption Corticosterone (green hexagons), a glucocorticoid hormone related to stress, stimulates astrocytes in the brain to release fibroblast growth factor 2 (FGF2), which triggers the generation of new neurons from neural stem cells. Credit Daniela Kaufer and Elizabeth Kirby Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.