The 11-beta-hydroxylase enzyme is a member of the cytochrome P450 family of enzymes. These enzymes are involved in the formation and breakdown of various molecules within cells. The 11-beta-hydroxylase enzyme helps produce hormones called cortisol and corticosterone.

Where is 11 Deoxycortisol produced?

11-Deoxycorticosterone (DOC), or simply deoxycorticosterone, also known as 21-hydroxyprogesterone, as well as desoxycortone (INN), deoxycortone, and cortexone, is a steroid hormone produced by the adrenal gland that possesses mineralocorticoid activity and acts as a precursor to aldosterone.

Why does CAH cause hypertension?

11β-OH CAH results in hypertension due to excessive mineralocorticoid effects. It also causes excessive androgen production both before and after birth and can virilize a genetically female fetus or a child of either sex.

Why does 11 beta hydroxylase cause hypertension?

A buildup in the precursors used to form corticosterone increases salt retention, leading to hypertension in individuals with the classic form of CAH due to 11-beta-hydroxylase deficiency.

Why does 11Beta hydroxylase deficiency cause hypertension?

Deficiencies of steroid 11β-hydroxylase or 17α-hydroxylase are types of congenital adrenal hyperplasia, the autosomal recessive inability to synthesize cortisol. These two defects often cause hypertension because of overproduction of cortisol precursors that are, or are metabolized to, mineralocorticoid agonists.

Is 11-deoxycortisol a glucocorticoid?

11-Deoxycortisol acts as a glucocorticoid, though is less potent than cortisol. 11-Deoxycortisol is synthesized from 17α-hydroxyprogesterone by 21-hydroxylase and is converted to cortisol by 11β-hydroxylase .

What is the role of 11-deoxycortisol in metyrapone testing?

Combining 11-deoxycortisol measurements with ACTH measurements during metyrapone testing further enhances the performance of the test. Impairment of any component of the HPA-axis results in a subnormal rise in 11-deoxycortisol levels.

What is the difference between 21-hydroxylase deficiency and 11-deoxycortisol deficiency?

In 11β-hydroxylase deficiency, 11-deoxycortisol can also be converted to androstenedione in a pathway that could explain the increase in androstenedione levels this condition. In 21-hydroxylase deficiency, 11-deoxycortisol levels are low.

What do elevated 11-deoxycortisol levels indicate in congenital adrenal hyperplasia?

In a patient suspected of having congenital adrenal hyperplasia (CAH), elevated serum 11-deoxycortisol levels indicate possible 11 beta-hydroxylase deficiency. However, not all patients will show baseline elevations in serum 11-deoxycortisol levels.