Angiotensin converting enzyme
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Angiotensin Converting Enzyme (ACE) and Blood Pressure Regulation
Angiotensin converting enzyme (ACE) is a key enzyme in the renin-angiotensin system, responsible for converting angiotensin I into angiotensin II, a peptide that causes blood vessels to constrict and raises blood pressure. This central role in blood pressure regulation is why ACE is a major target for drugs treating hypertension and cardiovascular diseases 249. ACE is found throughout the body, especially in the lungs, vascular endothelium, kidneys, and other organs 2710.
ACE Structure, Isoforms, and Genetic Variation
ACE exists in two main isoforms: a somatic form with two active domains and a germinal form important for male fertility. These isoforms have different substrate affinities and functions . Genetic variation in the ACE gene, particularly an insertion/deletion polymorphism, influences the levels of circulating ACE and has been linked to susceptibility to cardiovascular diseases, though findings are sometimes inconsistent 58. The diversity in the ACE gene is similar to other regions of the human genome, and genetic differences can affect how much ACE is produced in different people 58.
ACE2: A Homologue with Distinct Functions
ACE2 is a homologue of ACE but has different functions. It acts as a counter-regulator in the renin-angiotensin system by converting angiotensin II into angiotensin 1-7, which has protective effects on the heart and blood vessels 139. ACE2 is highly expressed in the cardiovascular system, kidneys, gut, and lungs, and is especially important in protecting against tissue injury caused by overactivation of the renin-angiotensin system 13. Unlike ACE, ACE2 is not inhibited by common ACE inhibitors .
ACE and ACE2 in Disease and Therapy
Both ACE and ACE2 are involved in various diseases. ACE is implicated in hypertension, heart failure, and other cardiovascular conditions, while ACE2 has gained attention as the cellular receptor for SARS-CoV-2, the virus responsible for COVID-19 12. Loss of ACE2 function increases susceptibility to heart disease, while increased ACE2 activity is generally protective . ACE inhibitors and angiotensin receptor blockers are widely used to manage cardiovascular diseases by targeting these pathways 29.
ACE in Immunity and Other Physiological Roles
Beyond blood pressure regulation, ACE also plays roles in immune function. It modulates the activity of macrophages and neutrophils, enhancing their ability to fight infections and tumors when overexpressed. These immune effects are independent of angiotensin II and may involve the processing of other peptides important for immune responses . ACE is also involved in renal development, male reproduction, and the metabolism of various peptides 46.
Clinical Significance and Diagnostic Use
ACE activity is often measured in clinical settings, especially in conditions like sarcoidosis, where macrophages produce increased amounts of the enzyme . Changes in serum ACE levels can indicate lung injury or other diseases, but the clinical significance of these measurements is still being established, and standardized methods are needed .
Conclusion
Angiotensin converting enzyme and its homologue ACE2 are central to the regulation of blood pressure, cardiovascular health, and immune function. Their roles in disease and therapy continue to be areas of active research, especially with the emergence of new diseases like COVID-19. Understanding the balance between ACE and ACE2 activities is crucial for developing effective treatments for a range of conditions 1234+6 MORE.
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