Related Experiment Video
Updated: Aug 24, 2025
12:03
Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors
Published on: June 7, 2016
18.0K
Protecting glomerulus: role of angiotensin-II type 2 receptor
Sanket Patel1, Kalyani Kulkarni1, Tahir Hussain1
1Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston TX 77204, U.S.A.
Clinical Science (London, England : 1979)
|October 26, 2022
Summary
Angiotensin-II type 2 receptor (AT2R) activation prevents podocyte injury and proteinuria by reducing inflammatory cytokines and cathepsin L. This finding offers a potential therapeutic strategy for focal segmental glomerulosclerosis (FSGS).
Area of Science:
- Nephrology
- Molecular Biology
- Pathology
Background:
- Podocyte injury is a key factor in focal segmental glomerulosclerosis (FSGS) and proteinuric kidney diseases.
- Doxorubicin-induced podocyte injury involves increased proinflammatory cytokines and cathepsin L, which can degrade the glomerular slit diaphragm, leading to proteinuria.
- The angiotensin-II type 2 receptor (AT2R) is implicated in preserving slit diaphragm proteins and preventing proteinuria.
Purpose of the Study:
- To investigate the role of AT2R in preventing doxorubicin-induced podocyte injury and subsequent FSGS progression.
- To elucidate the molecular mechanisms by which AT2R exerts its protective effects against proteinuria.
Main Methods:
- In vivo studies using animal models of doxorubicin-induced nephropathy.
- Assessment of podocyte injury markers, proinflammatory cytokines (e.g., CCL2), cathepsin L activity, and slit diaphragm protein integrity.
- Evaluation of AT2R activation and its downstream effects on kidney pathology and proteinuria.
Main Results:
- AT2R activation was shown to prevent podocyte injury in vivo.
- AT2R activation led to down-regulation of cytokine CCL2 and subsequently cathepsin L.
- These effects limited the degradation of glomerular slit diaphragm proteins and reduced proteinuria, thereby mitigating FSGS progression.
Conclusions:
- AT2R activation demonstrates a significant protective role against podocyte injury and proteinuria.
- Targeting AT2R may represent a novel therapeutic approach for managing FSGS and other proteinuric kidney diseases.
- The mechanism involves the suppression of inflammatory pathways and cathepsin L activity, preserving glomerular structure.
Related Concept Videos
01:30Antihypertensive Drugs: Angiotensin II Receptor Blockers
831
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...
831
01:30Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors
785
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...
785
01:25Antihypertensive Drugs: Direct Renin Inhibitors
762
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,...
762
01:28Glomerular Filtration Rate and its Regulation
3.2K
The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
The myogenic...
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
The myogenic...
3.2K
01:33Hormonal Regulation
33.6K
The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
33.6K
01:26Heart Failure Drugs: Inhibitors of Renin-Angiotensin System
487
The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
487