Ace inhibitors mechanism of action
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Angiotensin-Converting Enzyme (ACE) Inhibitors: Mechanism of Action
ACE Function and Inhibition: Blood Pressure and Cardiovascular Effects
Angiotensin-converting enzyme (ACE) is a transmembrane enzyme that plays a key role in regulating blood pressure by converting angiotensin I into angiotensin II, a potent vasoconstrictor. ACE inhibitors block this conversion, leading to lower levels of angiotensin II, which helps reduce blood pressure and is beneficial in treating hypertension, heart failure, and other cardiovascular diseases Peng2005Taddei2016.
Bradykinin Pathway: Vasodilation and Cardioprotection
ACE also breaks down bradykinin, a molecule that promotes blood vessel dilation. By inhibiting ACE, these drugs increase bradykinin levels, which enhances vasodilation, reduces oxidative stress, and improves cardiovascular health. The increased bradykinin signaling is thought to contribute significantly to the cardioprotective effects of ACE inhibitors, sometimes even more than the reduction of angiotensin II, especially at higher drug doses Bezerra2022Jo2024.
Novel Mechanisms: Antifibrotic and Anti-Inflammatory Effects
Recent research has identified additional mechanisms for ACE inhibitors. They prevent the breakdown of N-acetyl-seryl-aspartyl-lysyl-proline (Ac-SDKP), a peptide that reduces cardiac fibrosis, inflammation, and cell proliferation. This action helps decrease collagen deposition and inflammatory cell infiltration in the heart, providing further protection against heart damage in conditions like hypertension .
Inhibition of Matrix Metalloproteinases (MMPs): Preventing Heart Remodeling
ACE inhibitors can also directly reduce the activity of matrix metalloproteinases (MMPs), particularly MMP-2, which are enzymes involved in the structural remodeling of the heart. By inhibiting MMP activity, ACE inhibitors help prevent negative changes in heart size and function, especially in heart failure .
Metabolic Effects: Improved Glucose Control
In addition to cardiovascular benefits, ACE inhibitors improve metabolic control, especially in people with insulin resistance or type 2 diabetes. They enhance glucose uptake in skeletal muscle by increasing bradykinin and reducing angiotensin II, which together improve insulin signaling and glucose transport .
Peptide-Based ACE Inhibitors: Food and Marine Sources
Bioactive peptides from foods (such as sufu, hazelnut, and casein) and marine organisms can also inhibit ACE. These peptides work by binding to the enzyme, either at the active site (competitive inhibition) or at other sites (non-competitive inhibition), causing conformational changes that reduce ACE activity. These natural peptides have shown antihypertensive effects in animal studies and are being explored as alternative or complementary therapies for blood pressure control Liu2018Yang2024Brower2007+1 MORE.
Conclusion
ACE inhibitors lower blood pressure and protect the heart by blocking the formation of angiotensin II and increasing bradykinin levels, leading to vasodilation and reduced cardiovascular risk. They also have antifibrotic, anti-inflammatory, and metabolic benefits, and can prevent harmful heart remodeling. Natural peptides from food and marine sources offer promising new ways to inhibit ACE and manage hypertension.
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