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Related Concept Videos

Formation of Dilute Urine01:20

Formation of Dilute Urine

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The formation of dilute urine is a critical renal adaptation that maintains fluid balance, particularly during periods of high fluid intake. This process primarily involves the juxtamedullary nephrons. By adjusting the permeability of water and ions in response to physiological conditions, the kidneys can either conserve or excrete water, resulting in concentrated or dilute urine.
Filtrate Osmolarity in the PCT
Initially, as the filtrate passes through the proximal convoluted tubule (PCT), its...
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Formation of Concentrated Urine01:23

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There is a gradient of solutes in the interstitial fluid from the renal cortex through the medulla, known as the medullary osmotic gradient. The juxtamedullary nephrons establish and maintain this gradient using countercurrent mechanisms with loops extending deep into the medulla. These nephrons also use countercurrent mechanisms to regulate urine volume and concentration. The interaction between the descending and ascending limbs of the nephron loop creates an osmotic gradient through...
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Renal Regulation of Acid-Base Balance01:29

Renal Regulation of Acid-Base Balance

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Metabolic reactions in the body produce nonvolatile acids, such as sulfuric acid, which generate an acid load of approximately 1 mEq of H+ per kilogram of body weight daily. Excreting H+ in the urine is essential to balance this acid load.
In the kidneys, cells within the proximal convoluted tubules (PCT) and the collecting ducts secrete hydrogen ions (H+) into the tubular fluid. Specifically, in the PCT, Na+/H+ antiporters secrete H+ while reabsorbing Na+.
However, the intercalated cells in...
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Renal Tubule and Collecting Duct01:24

Renal Tubule and Collecting Duct

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The renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
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Renal Drug Excretion: Tubular Secretion01:28

Renal Drug Excretion: Tubular Secretion

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Active tubular secretion is a robust, energy-demanding process that utilizes carrier systems to transport drugs into renal tubules. The active renal secretion systems include the organic anion transporter (OAT) for weak acids and the organic cation transporter (OCT) for weak bases. Structurally similar drugs can compete for the same transporter, potentially leading to drug accumulation and toxicity. However, this principle can be exploited therapeutically. One example is probenecid (Probalan),...
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Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

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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.
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A Closed-Loop Cascade Strategy for On-Demand Regulation of Uric Acid.

Chenyao Nie1, Ji Xu1, Yuhui Zhao2

  • 1School of Pharmaceutical Sciences, Cixi Biomedical Research Institute, Wenzhou Medical University, Zhejiang, 325035, P. R. China.

Advanced Healthcare Materials
|October 30, 2024
PubMed
Summary

A novel biocompatible composite, NW-FPNP/uricase (UOX), offers on-demand regulation of uric acid (UA) levels. This closed-loop system prevents medication overdose and hypouricemia in hyperuricemia treatment.

Keywords:
closed‐loop cascade strategymultifunctional compositeon‐demand regulationresponsive activationuric acid

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Area of Science:

  • Biomaterials Science
  • Biomedical Engineering
  • Biochemistry

Background:

  • Current anti-hyperuricemia drugs risk side effects due to imprecise dosing or over-lowering of uric acid (UA).
  • Effective management of hyperuricemia requires precise control over UA levels to avoid adverse events like hypouricemia.

Purpose of the Study:

  • To develop a closed-loop cascade strategy for on-demand regulation of UA levels using a biocompatible network composite.
  • To create an intelligent system that prevents medication overdose and maintains UA within a therapeutic range.

Main Methods:

  • Fabrication of NW-FPNP/uricase (UOX) composite encapsulating UA-responsive UOX and H2O2-sensitive FPNP (febuxostat nanoparticle).
  • Integration of UA metabolization and generation pathways into a closed cascade reaction loop.
  • Utilizing UA level-dependent auto-adjustment of xanthine oxidase (XOD) activity for dynamic regulation.

Main Results:

  • The NW-FPNP/UOX system demonstrated UA level-dependent auto-adjustment of XOD activity (e.g., 6% at 600 µM UA vs. 82% at 100 µM UA).
  • The system effectively regulated UA levels within an appropriate range by balancing UA metabolism and generation.
  • The biocompatible composite successfully prevented both medication overdose and hypouricemia in a simulated hyperuricemia treatment.

Conclusions:

  • A novel closed-loop cascade strategy using NW-FPNP/UOX enables intelligent, on-demand UA level management.
  • This approach offers a promising solution for precise hyperuricemia treatment, avoiding common side effects.
  • The study introduces a new paradigm for regulating biochemical indicators within specific thresholds using responsive biomaterials.