The HPA axis is a valuable part of the neuroendocrine and is the regulation of the body's stress levels. Under psychological conditions, glucocorticoid negatively feeds back to the brain by regulating monoamine neurotransmitter release, inhibiting the activity of HPA and weakening the stress response. Consistent and high levels of glucocorticoids can lead to abnormal release of monoamine neurotransmitters in the brain. 

Hypothalamic-Pituitary-Adrenal (HPA)

Many previous studies have found that early life stress can induce microglia vulnerability in later life by changing gene expression, morphology and phagocytic activity. Chronic stress has also been shown to cause depressive symptoms by affecting microglia's pruning ability and synaptic plasticity. Stressful lives during adolescence can cause rapid microglia changes in distribution/function that can affect synaptic and neuronal development.

University of Illinois at Chicago

Many studies have found that stress can affect inflammation in Major Depressive Disorder. It has also been found that anger can induce cortisol while fear can cytokine while decreasing cortisol. This suggests that anger may trigger adaptive and mobilize energy while fear also promotes withdrawal. A lack of anger may be a cause for depression correlated inflammation. Stress related emotions may have an effect on monoamine oxidase activity and activate the primary microglia of the immune cell.

Monoamines and Microglial in the Brain

Jiang, Y., Zou, D., Li, Y., Gu, S., Dong, J., Ma, X., Xu, S., Wang, F., & Huang, J. H. (2022, September 28). Monoamine neurotransmitters control basic emotions and affect major depressive disorders. Pharmaceuticals (Basel, Switzerland). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9611768/#:~:text=The%20dopamine%20(DA)%20system%20is,flight”%20behavior%20during%20stressful%20events. 

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