Chapter 33: Adrenal Steroids and Related Drugs

Adrenal Steroids and Related Drugs educational video provides a comprehensive pharmacological review of adrenal steroids and related agents, focusing on the synthesis, regulation, and clinical application of adrenocorticosteroids produced by the adrenal cortex. It explains the hypothalamic-pituitary-adrenal (HPA) axis regulation of cortisol via corticotropin (ACTH) and the renin-angiotensin system's control of aldosterone. The discussion details the mechanism of action where steroid hormones bind to cytoplasmic receptors to modulate gene transcription, affecting protein synthesis, gluconeogenesis, and anti-inflammatory pathways. A major focus is placed on the classification of glucocorticoid drugs based on potency and duration of action, distinguishing between short-acting agents like hydrocortisone and cortisone, intermediate-acting drugs such as prednisone, prednisolone, and methylprednisolone, and high-potency, long-acting agents like dexamethasone and betamethasone. The summary explores the molecular basis of anti-inflammatory effects, including the inhibition of NF-kappaB, suppression of cytokines and T-lymphocyte activation, and the upregulation of annexin-1 (lipocortin-1) which inhibits phospholipase A2 and subsequent prostaglandin and leukotriene synthesis. Clinical indications are thoroughly reviewed, covering replacement therapy for primary adrenal insufficiency (Addison disease) and congenital adrenal hyperplasia (CAH), as well as management of nonadrenal disorders like asthma, allergic rhinitis, autoimmune diseases (systemic lupus erythematosus, rheumatoid arthritis), and dermatologic conditions requiring topical application. The video also outlines the adverse effects associated with supraphysiologic doses, such as iatrogenic Cushing syndrome (moon face, buffalo hump), osteoporosis, hyperglycemia, and HPA axis suppression. Finally, the chapter addresses adrenal steroid inhibitors like metyrapone, ketoconazole, and osilodrostat which target 11-beta-hydroxylase, and receptor antagonists including spironolactone (mineralocorticoid blocker) and mifepristone, offering a complete study guide for pharmacology students.