What is debrisoquine used for?

Debrisoquine is a derivative of guanidine. It is an antihypertensive drug similar to guanethidine. Debrisoquine is frequently used for phenotyping the CYP2D6 enzyme, a drug-metabolizing enzyme.

What type of drug is Guanethidine?

Guanethidine belongs to the general class of medicines called antihypertensives. It is used to treat high blood pressure (hypertension).

What does CYP2D6 * 4 do?

The variant allele CYP2D6*4 is the main polymorphism resulting in reduced enzyme activity in Caucasians. Reduced enzyme activity potentially leads to increased toxicity of antidepressants, but the relevance of genotyping for clinical practice is unclear. Most clinical studies suffer from small numbers of patients.

What type of enzyme is CYP2D6 an example of?

Cytochrome P450 CYP2D6 is the most extensively characterized polymorphic drug-metabolizing enzyme.

What does it mean to be positive for CYP2D6 * 10 allele?

The CYP2D6*10 “C100T” mutation in patients leads to reduced enzyme activity and decrease of appropriate response to drug treatments, such as tamoxifen, codeine, antidepressants, and antipsychotics.

What is the CYP2D6 * 10 allele?

In contrast, the decreased function allele CYP2D6*10 is the most common allele in Asians, and CYP2D6*17 is almost exclusively found in individuals with African ancestry (25). Consequently, the phenotype frequencies also vary substantially among the major ethnicities and may vary among populations.

Why is phenoxybenzamine used?

This medication is used to treat high blood pressure and heavy sweating due to a certain tumor of the adrenal glands (pheochromocytoma). Phenoxybenzamine belongs to a class of drugs known as alpha blockers. It works by relaxing and widening blood vessels so that blood can flow more easily.

What is medicinal function of phenoxybenzamine?

It is used to treat high blood pressure (hypertension) due to a disease called pheochromocytoma. Phenoxybenzamine blocks the effects of certain chemicals in the body. When these chemicals are present in large amounts, they cause high blood pressure.

What is debrisoquine 4-hydroxylase?

Debrisoquine 4-hydroxylase (P450db1) was purified from rat liver microsomes. Polyclonal antibody was produced and, in conjunction with immunoblots, was used to identify and purify a second immunorelated P450 (P450db2) that does not have debrisoquine hydroxylating activity.

Is debrisoquine 4-hydroxylase activity decreased in the female rat strain?

A polymorphism has been described for debrisoquine metabolism in the DA rat strain, adult females having markedly decreased debrisoquine 4-hydroxylase activity. Our immunoblot analysis and mRNA analysis suggest that debrisoquine 4-hydroxylase deficiency in the female DA rat is not due to a decrease in db1 protein or mRNA.

What is the history of debrisoquine polymorphism?

The debrisoquine polymorphism was first reported in 1977 with a report that approximately 10% of Europeans could not metabolize this antihypertensive drug (Mahgoub, Idle, Dring, Lancaster, & Smith, 1977 ). The term “poor metabolizer” was used to describe this phenotype.

Does debrisoquine cause excessive uterine contractions?

This drug was known to cause erratic and excessive uterine contractions in women; the urinary ratio of sparteine to dehydrosparteines showed a bimodal distribution (33). This variability in debrisoquine/sparteine metabolism is another example of a Phase I DME polymorphism.