Ace angiotensin
Pro Research Analysisby 
Searched over 200M research papers for "ace angiotensin"
Understanding the Role of ACE and ACE2 in the Renin-Angiotensin System
Introduction to Angiotensin-Converting Enzyme (ACE)
Angiotensin-converting enzyme (ACE) is a critical component of the renin-angiotensin system (RAS), which regulates blood pressure, fluid, and electrolyte balance. ACE primarily converts angiotensin I (Ang I) into the potent vasoconstrictor angiotensin II (Ang II), thereby influencing cardiovascular function and homeostasis Donoghue2000Masuyer2012Bernstein2013. ACE is a zinc-dependent peptidase with two homologous catalytic domains, each contributing to its broad substrate specificity and physiological impact .
ACE2: A Homologue with Distinct Functions
ACE2, a homologue of ACE, was identified as a key player in the RAS with distinct enzymatic functions. Unlike ACE, which is widely distributed, ACE2 expression is more restricted, primarily found in the heart, kidney, and testis Donoghue2000Guy2003. ACE2 converts Ang I to angiotensin 1-9 (Ang 1-9) and degrades Ang II to angiotensin 1-7 (Ang 1-7), which has vasodilatory effects Donoghue2000Guy2003Burrell2004. This suggests that ACE2 acts in a counter-regulatory manner to ACE, balancing the effects of vasoconstriction and vasodilation within the cardiovascular and renal systems Guy2003Burrell2004.
The ACE2/Angiotensin-(1-7)/MAS Axis
The discovery of the ACE2/Angiotensin-(1-7)/MAS axis has expanded our understanding of the RAS. Angiotensin-(1-7) (Ang-(1-7)), produced by ACE2, exerts protective cardiovascular effects by binding to the MAS receptor, counteracting the effects of Ang II Santos2017Bernstein2018. This axis plays a significant role in modulating inflammation, fibrosis, and cell growth, particularly in the heart and kidneys Bernstein2018Silva2016.
ACE Inhibition and Its Effects
ACE inhibitors, such as captopril, are widely used to manage hypertension and heart failure by preventing the conversion of Ang I to Ang II. These inhibitors also increase the levels of other peptides, such as N-acetyl-seryl-aspartyl-lysyl-proline (Ac-SDKP), which regulates hematopoiesis by inhibiting stem cell entry into the S-phase Azizi1996Masuyer2012. The inhibition of ACE leads to a significant increase in plasma Ac-SDKP levels, highlighting the enzyme's role in hematopoietic regulation .
Structural and Functional Differences Between ACE and ACE2
The structural differences between ACE and ACE2 are crucial for their distinct substrate specificities and functions. ACE is a dipeptidyl carboxypeptidase, while ACE2 is a carboxypeptidase, which explains why classical ACE inhibitors do not affect ACE2 activity Donoghue2000Guy2003. The active sites of these enzymes differ, particularly in the ligand-binding pockets, which influence their substrate interactions and chloride dependence .
Therapeutic Implications and Future Directions
Understanding the distinct roles of ACE and ACE2 in the RAS has significant therapeutic implications. Enhancing the activity of ACE2 or increasing the levels of Ang-(1-7) and Ang-(1-9) could offer new strategies to counteract the detrimental effects of Ang II in cardiovascular and renal diseases Bernstein2018Silva2016. Additionally, the development of ACE domain-specific inhibitors could provide more targeted treatments for various conditions influenced by the RAS .
Conclusion
The renin-angiotensin system, with its components ACE and ACE2, plays a pivotal role in cardiovascular and renal physiology. While ACE primarily promotes vasoconstriction and blood pressure regulation, ACE2 serves as a counter-regulatory enzyme, promoting vasodilation and protective effects. The balance between these enzymes is crucial for maintaining cardiovascular health, and ongoing research continues to uncover new therapeutic potentials within this system.
Sources and full results
Most relevant research papers on this topic