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Related Concept Videos

Introduction to Urinary System01:13

Introduction to Urinary System

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The urinary system consists of two kidneys, two ureters, the urinary bladder, and the urethra.
The kidneys are bean-shaped organs located in the retroperitoneal space, on either side of the vertebral column, between the T12 and L3 vertebrae. They are partially protected by the rib cage and surrounded by perirenal fat, which provides cushioning. They are responsible for urine formation and play critical roles in regulating blood pressure, electrolyte levels, and hormone production. The ureters...
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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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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

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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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Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion01:22

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The kidneys maintain homeostasis through filtration, reabsorption, and secretion. Tubular reabsorption and secretion are crucial in forming urine and regulating electrolytes, water balance, and waste elimination.Tubular Reabsorption and Secretion ProcessesTubular reabsorption is the process that reclaims essential substances such as electrolytes, glucose, amino acids, and water from the glomerular filtrate back into the bloodstream. This is achieved through passive and active transport...
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Physiology of the Genitourinary System III: Urine Concentration and Dilution01:20

Physiology of the Genitourinary System III: Urine Concentration and Dilution

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The kidneys concentrate or dilute urine to maintain water and electrolyte balance. Nephrons, particularly the loop of Henle, play a crucial role in this process through the countercurrent multiplication system. This system establishes a high osmolarity in the renal medulla, which is essential for water reabsorption. In the loop of Henle’s descending limb, water is reabsorbed into the surrounding medulla due to its permeability to water. In contrast, the ascending limb actively transports...
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A Novel Clinical Grade Isolation Method for Human Kidney Perivascular Stromal Cells
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Renal interstitial cells to the rescue.

Hannah M Wesselman1, Rebecca A Wingert1

  • 1Department of Biological Sciences, University of Notre Dame, Notre Dame, United States.

Elife
|February 21, 2023
PubMed
Summary

Adult zebrafish can regenerate damaged kidney nephrons. This regeneration relies on the close collaboration between renal progenitor cells and renal interstitial cells.

Area of Science:

  • Regenerative medicine
  • Comparative physiology
  • Zebrafish kidney regeneration

Background:

  • The adult zebrafish exhibits remarkable regenerative capabilities, particularly in its kidney.
  • Understanding the cellular mechanisms underlying kidney regeneration is crucial for advancing human renal therapies.

Discussion:

  • The study highlights the indispensable interplay between renal progenitor cells and renal interstitial cells for nephron repair.
  • This interaction is key to initiating and executing the regenerative process in the zebrafish kidney.

Key Insights:

  • Successful nephron regeneration in adult zebrafish necessitates coordinated action between renal progenitor and interstitial cells.
  • These two cell types form a functional unit essential for kidney repair.
Keywords:
PGE2developmental biologykidneyregenerationrenal interstitial cellszebrafish

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Outlook:

  • Further research into this cellular crosstalk could reveal novel therapeutic targets for kidney disease.
  • Investigating conserved mechanisms may offer insights into mammalian kidney regeneration.