Glucocoicoids lead to an increase in blood levels of which of the following?
**Core Concept**
Glucocorticoids are a class of steroid hormones that have various effects on metabolism, immune response, and electrolyte balance. They are known to induce a catabolic state, leading to increased gluconeogenesis and thus elevated blood glucose levels.
**Why the Correct Answer is Right**
Glucocorticoids act by binding to the glucocorticoid receptor, which then translocates to the nucleus to regulate gene expression. This results in the upregulation of enzymes involved in gluconeogenesis, such as glucose-6-phosphatase and phosphoenolpyruvate carboxykinase. Consequently, there is an increase in glucose production in the liver, leading to elevated blood glucose levels. Additionally, glucocorticoids inhibit the uptake of glucose by peripheral tissues, further contributing to hyperglycemia.
**Why Each Wrong Option is Incorrect**
**Option A:** Glycogen - Glucocorticoids actually lead to glycogen breakdown (glycogenolysis) rather than an increase in glycogen levels.
**Option B:** Insulin - Glucocorticoids have an opposing effect on insulin, leading to decreased insulin sensitivity and secretion.
**Option C:** Free fatty acids - While glucocorticoids do lead to increased lipolysis, resulting in elevated free fatty acid levels, this is not the primary effect being tested.
**Clinical Pearl / High-Yield Fact**
Glucocorticoids can cause hyperglycemia and impaired glucose tolerance, particularly at high doses or in susceptible individuals. This is a critical consideration in patients with diabetes or those at risk of developing diabetes, such as those with a family history of the disease.
**Correct Answer: B. Insulin**