What does low serum corticosterone, but high plasma ACTH indicate in stressed rats?
Answers
Answer:
Explanation:
Elevated ACTH but low CORT is sometimes seen in rodent models of post-traumatic stress disorder (only in males though, are you using males? There are significant sex differences in the HPA axis response to stress). Diminished CORT release in response to stress could be due to a sensitization (or increase in number) of glucocorticoid receptors (GR) in the pituitary, and if all GR are saturated with ligand, no more suppression of ACTH can occur so that's where you can get high ACTH and low CORT. Due to this, the adrenal glands can become insensitive to ACTH--you can quantify ACTH receptors or just give them an ACTH injection and measure their CORT response to see.
Answer:
Explanation:
If you want to explore further what's going on in your rats I suggest looking at the dexamathasone suppression test to measure HPA negative feedback (see attached paper).
After almost a month of Chronic Unpredictable Mild Stress (CUMS), both of my control rats (no stress) and stress-model rats exhibit low serum corticosterone concentration. Surprisingly, the level of ACTH in stress-model rats were significantly higher compared to control rats. Is it a common observation