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Related Concept Videos

Nephrons01:10

Nephrons

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The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma...
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Renal Corpuscle01:20

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The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
Glomerulus: Structure and Function
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Factors Affecting Renal Clearance: Renal Impairment01:17

Factors Affecting Renal Clearance: Renal Impairment

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Renal dysfunction significantly impairs the renal clearance of drugs, leading to potential complications in drug therapy. Renal failure, which can be caused by various factors, poses a significant challenge in the elimination of drugs from the body.
One condition associated with renal failure is uremia. Uremia is characterized by impaired glomerular filtration and fluid accumulation in the body. This condition hinders the renal clearance of drugs, resulting in drug accumulation and potential...
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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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Drug Elimination by Renal Route: Tubular Secretion01:15

Drug Elimination by Renal Route: Tubular Secretion

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Once the process of glomerular filtration is completed, blood carrying unfiltered drug molecules traverses through efferent arterioles and makes its way into the peritubular capillaries in the proximal tubule. A variety of carriers play a pivotal role in actively secreting drugs from these peritubular capillaries into the tubular fluid. The organic anion transporter transfers acidic drugs, against an electrochemical gradient, from the peritubular capillaries into the renal tubule cells and...
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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
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Related Experiment Video

Updated: Jun 4, 2025

Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium
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Intestinal barrier function declines during polycystic kidney disease progression.

Randee Sedaka1, Caleb Lovelady1, Emily Hallit1

  • 1Section of Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Alabama, United States.

American Journal of Physiology. Renal Physiology
|December 18, 2024
PubMed
Summary
This summary is machine-generated.

In autosomal dominant polycystic kidney disease (ADPKD), kidney injury precedes intestinal issues. Early stages show a tighter gut barrier, which becomes leaky as kidney cysts progress, impacting water balance.

Keywords:
ADPKDcolonintegritymotilitywater

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Area of Science:

  • Nephrology and Gastroenterology
  • Molecular Biology and Genetics
  • Disease Pathogenesis

Background:

  • Autosomal dominant polycystic kidney disease (ADPKD) is characterized by kidney cyst development, primarily due to PKD1 mutations.
  • Kidney-specific Pkd1 loss in ADPKD leads to epithelial dysfunction and inflammation.
  • The intestinal impact of Pkd1 loss in ADPKD remains largely unexplored.

Purpose of the Study:

  • To investigate the hypothesis that Pkd1 loss causes intestinal epithelial barrier dysfunction and inflammation preceding cystogenesis in ADPKD.
  • To evaluate kidney and intestinal integrity, inflammation, and gut function in a mouse model of ADPKD.

Main Methods:

  • Utilized inducible, global Pkd1 knockout (Pkd1KO) mice and control littermates.
  • Assessed kidney and intestinal phenotypes at early (3 months) and late (6 months) stages of disease.
  • Analyzed kidney and intestinal integrity markers, inflammation, gut motility, and fecal water excretion.

Main Results:

  • Early-stage Pkd1KO mice showed mild kidney cysts but a tighter intestinal barrier with no inflammation.
  • Late-stage Pkd1KO mice exhibited severe kidney cysts, impaired function, a leakier intestinal barrier, and increased inflammation.
  • Gut motility and fecal water excretion were elevated in Pkd1KO mice regardless of age.

Conclusions:

  • Kidney injury precedes intestinal injury in ADPKD, with the intestinal barrier becoming compromised as cystogenesis advances.
  • Progressive intestinal barrier dysfunction and altered water/sodium transport contribute to ADPKD pathophysiology.
  • Extrarenal water loss is a significant factor in ADPKD progression, warranting clinical evaluation.