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Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors01:30

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Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...
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The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...
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Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
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Antihypertensive Drugs: Action of Diuretics01:16

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Diuretics are antihypertensive drugs used to treat hypertension resulting from sodium and water retention. Sodium, vital for fluid balance and nerve or muscle function, is regulated by the kidneys through millions of nephrons. Blood enters nephrons via afferent arterioles, which branch into capillaries called glomeruli. These filter blood plasma, allowing water and solutes, like sodium ions, to pass through capillary walls into Bowman's capsule. The filtrate then flows through various...
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In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...
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Thiazide diuretics are sulfonamide derivatives featuring a benzothiadiazine ring system in their molecular structure. Based on this structure, thiazide diuretics can be categorized into two groups: thiazide-type and thiazide-like diuretics. Thiazide-type diuretics, including hydrochlorothiazide and chlorothiazide, consist of a benzothiadiazine backbone with an attached sulfonamide group. Thiazide-like diuretics, such as chlorthalidone and indapamide, lack the thiazide ring but demonstrate...
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The Protective Effect of Vitexin on Hypertensive Nephropathy Rats.

Tingting Duan1, Minyi Li1, Ziyang Lin1,2

  • 1Guangdong Nephrotic Drug Engineering Technology Research Center, Institute of Consun Co. for Chinese Medicine in Kidney Diseases, Guangdong Consun Pharmaceutical Group, Guangzhou, China.

Kidney & Blood Pressure Research
|July 30, 2024
PubMed
Summary

Vitexin, a natural compound, effectively lowers blood pressure and improves kidney function in hypertensive nephropathy (HN) models. It combats inflammation and oxidative stress, showing promise for HN treatment.

Keywords:
Hypertensive nephropathyNuclear factor kappa-BRatsTumor necrosis factor-αVitexin

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Area of Science:

  • Pharmacology
  • Nephrology
  • Cardiovascular Research

Background:

  • Vitexin is a natural flavonoid with diverse pharmacological activities.
  • Its protective effects and mechanisms against hypertensive nephropathy (HN) are not well understood.

Purpose of the Study:

  • To investigate the protective effects of vitexin on hypertensive nephropathy (HN).
  • To elucidate the underlying mechanisms of vitexin's action in HN.

Main Methods:

  • A rat model of hypertensive nephropathy was established using a high-sugar and high-fat diet.
  • Vitexin was administered orally, and blood pressure was monitored.
  • Histopathological, biochemical, and western blotting analyses were performed.

Main Results:

  • Vitexin significantly reduced blood pressure and improved kidney histopathology in HN rats.
  • It decreased markers of kidney damage (creatinine, BUN) and lipid/inflammation markers (TC, TG, TNF-α, IL-6).
  • Vitexin increased antioxidant capacity (SOD) and reduced oxidative stress markers (MDA, AGEs), while downregulating NF-κB signaling.

Conclusions:

  • Vitexin demonstrates significant protective effects against hypertensive nephropathy.
  • These findings provide pharmacological evidence for vitexin's therapeutic potential in treating HN.