Question 1

What is the Meaning of Cytochrome P450c17α?

Accepted Answer

Cytochrome P450c17α, formally known as CYP17A1, is a critical enzyme within the cytochrome P450 superfamily. It possesses two distinct enzymatic activities: 17α-hydroxylase and 17,20-lyase, both of which are indispensable for the biosynthesis of steroid hormones from cholesterol precursors.

Question 2

What is the Context of Cytochrome P450c17α?

Accepted Answer

This enzyme primarily operates within the endoplasmic reticulum of steroidogenic cells found in the adrenal glands and gonads, specifically the testes and ovaries. Its pivotal role within the endocrine system involves catalyzing rate-limiting steps in the steroidogenesis pathway, facilitating the conversion of progestins into androgens and ultimately, estrogens.

Question 3

What is the Significance of Cytochrome P450c17α?

Accepted Answer

Understanding Cytochrome P450c17α is central to diagnosing and managing various hormonal conditions. Dysregulation or genetic alterations of this enzyme can manifest as disorders of sexual development, specific forms of congenital adrenal hyperplasia, or hyperandrogenic states such as polycystic ovary syndrome. Its proper function directly influences an individual's pubertal progression, reproductive capacity, and overall endocrine health.

Question 4

What is the Mechanism of Cytochrome P450c17α?

Accepted Answer

The enzyme performs two sequential reactions within the endoplasmic reticulum, starting with the 17α-hydroxylation of pregnenolone and progesterone. Subsequently, its 17,20-lyase activity converts 17-hydroxypregnenolone into dehydroepiandrosterone (DHEA) and 17-hydroxyprogesterone into androstenedione. These steps are crucial for diverting the steroid synthesis pathway towards androgen production.

Question 5

What is the Application of Cytochrome P450c17α?

Accepted Answer

Clinically, Cytochrome P450c17α is a significant pharmacological target, particularly in the management of hormone-dependent cancers. For instance, specific inhibitors like abiraterone acetate are utilized to reduce androgen production in patients with metastatic prostate cancer. Knowledge of its function guides therapeutic strategies aimed at modulating steroid hormone levels to restore physiological balance or mitigate disease progression in conditions of hormonal excess or deficiency.

Question 6

What is the Metric of Cytochrome P450c17α?

Accepted Answer

Assessment of Cytochrome P450c17α activity or its impact typically involves measuring circulating levels of specific steroid hormones and their precursors. Key biomarkers include serum dehydroepiandrosterone, androstenedione, testosterone, and 17-hydroxyprogesterone. Genetic analysis of the CYP17A1 gene can identify mutations contributing to enzyme dysfunction, while clinical evaluation observes physical manifestations of hormone imbalance.

Question 7

What is the Risk of Cytochrome P450c17α?

Accepted Answer

Improper regulation or inherited deficiencies of Cytochrome P450c17α carry distinct clinical risks. For example, severe CYP17A1 deficiency leads to a rare form of congenital adrenal hyperplasia characterized by impaired sex steroid synthesis and potential mineralocorticoid excess. Conversely, therapeutic inhibition, while beneficial in some contexts, can lead to side effects such as adrenal insufficiency or hypertension due to metabolic shunting. Any intervention targeting this enzyme requires careful medical supervision to avoid adverse outcomes and maintain patient well-being.

Cytochrome P450c17α

Meaning

Context

Significance

Mechanism

Application

Metric

Risk

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