How too much stress hormone early in life changes how fish handle stress later
Optogenetic induction of chronic glucocorticoid exposure in early‐life leads to blunted stress‐response in larval zebrafish
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Chronic high cortisol leads to a weaker stress response instead of a stronger one.
Most people assume more stress hormone means a hyperactive stress system, but here it caused a blunted reaction — suggesting overexposure may 'exhaust' or reprogram the system.
Practical Takeaways
Protecting early-life environments from chronic stress may help preserve healthy stress responses later in life.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Chronic high cortisol leads to a weaker stress response instead of a stronger one.
Most people assume more stress hormone means a hyperactive stress system, but here it caused a blunted reaction — suggesting overexposure may 'exhaust' or reprogram the system.
Practical Takeaways
Protecting early-life environments from chronic stress may help preserve healthy stress responses later in life.
Publication
Journal
European Journal of Neuroscience
Year
2024
Authors
Jatin Nagpal, H. Eachus, Olga Lityagina, Soojin Ryu
Related Content
Claims (4)
If baby zebrafish have too much of a stress hormone early in life, they might not react as strongly to stress later on — like their stress system gets 'numb' and stays that way.
When baby zebrafish have higher stress hormone levels early in life, it seems to change how certain genes in their brain work—turning down one gene linked to stress control and turning up another—hinting at how early stress might rewire their stress response system.
Scientists used light to turn on special cells in baby zebrafish that make a stress hormone, and found it stayed high for a long time — showing a new way to study long-term stress in developing fish.
If your body makes too much cortisol for too long, your adrenal glands can get worn out and stop working well when you actually need to handle stress.