Glucocorticoids are a class of steroid hormones that includes cortisol. These hormones bind to specific receptors in cells, called glucocorticoid receptors, which are present in various tissues throughout the body. When cortisol or other glucocorticoids bind to these receptors, they can exert their effects on metabolism, immune function, inflammation, and other physiological processes. The glucocorticoid pathway is essential for regulating these functions and maintaining homeostasis in the body. Cortisol, a steroid hormone, is synthesized from cholesterol. It is synthesized in the zona fasciculata layer of the adrenal cortex. Adrenocorticotropic hormone (ACTH), released from the anterior pituitary, functions to increase LDL receptors and increase the activity of cholesterol desmolase, which converts cholesterol to pregnenolone and is the rate-limiting step of cortisol synthesis. The majority of glucocorticoids circulate in an inactive form, bound to either corticosteroid-binding globulin (CBG) or albumin.[2] The inactive form is converted to its active form by 11-beta-hydroxysteroid dehydrogenase 1 (11-beta-HSD1) in most tissues, while 11-beta-HSD2 inactivates cortisol back to cortisone in the kidney and pancreas. When cortisol binds to the glucocorticoid receptors in the body, it elicits a wide range of physiological and metabolic effects. These effects are part of the body's response to stress and play essential roles in maintaining homeostasis. Major effects that occur naturally are metabolism regulation, wherein Cortisol promotes the breakdown of fats and proteins to provide energy for the body. It also stimulates gluconeogenesis, which is the production of glucose from non-carbohydrate sources, such as amino acids and glycerol. This helps maintain blood glucose levels; anti-inflammatory response wherein cortisol suppresses the immune system's inflammatory response by inhibiting the production of pro-inflammatory cytokines and other mediators of inflammation, immunosuppression wherein cortisol inhibits the activity of immune cells, such as lymphocytes and leukocytes, which can help reduce immune responses. This effect is beneficial in controlling autoimmune reactions but can also make the body more susceptible to infections. Others are stress response and blood pressure regulation, anti-allergic response, tissue repair and modulation of mood and cognitive functions.

Glucocorticoid Pathway References