What is 11b HSD2?

16.3. 3.3. 2 Fetuses Exposed to Increased Levels of Glucocorticoids. The placenta produces a molecule called 11 β -hydroxysteroid dehydrogenase type 2 (11 β -HSD2) which protects the fetus by metabolizing maternal cortisol that reaches the placental circulation.

What does hydroxysteroid dehydrogenase do?

Hydroxysteroid dehydrogenases (HSDs) or oxidoreductases catalyze the interconversion of alcohol and carbonyl functions in a position- and stereospecific manner on the steroid nucleus and side chain, using oxidized (+) or reduced (H) nicotinamide adenine dinucleotide, NAD(H), or NADP(H) as cofactors.

What converts cortisol to cortisone?

It is a naturally-occurring corticosteroid metabolite that is also used as a pharmaceutical prodrug; it is not synthesized in the adrenal glands. Cortisol is converted by the action of the enzyme corticosteroid 11-beta-dehydrogenase isozyme 2 into the inactive metabolite cortisone, particularly in the kidneys.

What enzyme converts cortisol to cortisone?

The enzyme 11-beta-hydroxysteroid dehydrogenase (EC 1.1. 1.146) converts active cortisol into inactive cortisone. The HSD11B2 gene (OMIM 614232) encodes the isoenzyme that is expressed in the kidney and which plays a particularly important role in blood pressure regulation.

What is 17b HSD?

17-beta hydroxysteroid dehydrogenase 3 deficiency is a condition that affects male sexual development. People with this condition are genetically male, with one X and one Y chromosome in each cell, and they have male gonads (testes ).

Are there two types of 11β hydroxysteroid dehydrogenases?

There are two types of 11β-Hydroxysteroid dehydrogenases that control cortisol concentration: HSD-11β Type 1 and HSD-11β Type 2.

How is the dehydrogenase activity of hsd-11β determined?

The human genome encodes two distinct HSD-11β isozymes ( HSD-11β Type 1 and HSD-11β Type 2) on distinct genes. The dehydrogenase activity of a HSD-11β converts a 11beta-hydroxysteroid to the corresponding 11-oxosteroid by reducing NADP + or NAD +.

How does hyperlipidemia affect 11β hydroxysteroid dehydrogenase?

Hyperlipidemia has a great effect on 11β-hydroxysteroid-dehydrogenase. Glucocorticoid is dependent on Glucocorticoid plasma concentration, cellular glucocorticoid receptor expression and the pre-receptor hormone metabolism that is catalyzed by 11β-HSD.

Where are hsd-11βs expressed in the nervous system?

HSD-11βs are expressed in the central nervous system of aged individuals. It is essential in Hypothalamo-Pituitary-Adrenal Axis function. HSD-11βs also partakes involvement in the decline of conscious intellectual activity due to aging. The enzyme also contributes to central effects are also during the development stages.