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Related Concept Videos

Aquaporins01:25

Aquaporins

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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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Reabsorption and Secretion in the DCT and Collecting Duct01:26

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The early phase of the DCT manages the reabsorption of approximately 10-15% of filtered water, 5–10% of filtered sodium, and 5–10% of filtered chloride. This process is facilitated by Na+–Cl− symporters in apical membranes and sodium-potassium pumps, as well as Cl− leakage channels in basolateral membranes. The early DCT also stands out as a site where parathyroid hormone (PTH) stimulates calcium reabsorption, depending on the body's requirements.
The distal...
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Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion01:22

Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion

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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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Endocrine Signaling01:45

Endocrine Signaling

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Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
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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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Formation of Concentrated Urine01:23

Formation of Concentrated Urine

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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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Related Experiment Video

Updated: May 3, 2026

Easy Measurement of Diffusion Coefficients of EGFP-tagged Plasma Membrane Proteins Using k-Space Image Correlation Spectroscopy
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Easy Measurement of Diffusion Coefficients of EGFP-tagged Plasma Membrane Proteins Using k-Space Image Correlation Spectroscopy

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Elevated cAMP increases aquaporin-3 plasma membrane diffusion.

Saw Marlar1, Eva C Arnspang, Jennifer S Koffman

  • 1Institute of Molecular Biology and Genetics and Interdisciplinary Nanoscience Center, Aarhus University, Aarhus, Denmark; and.

American Journal of Physiology. Cell Physiology
|January 24, 2014
PubMed
Summary
This summary is machine-generated.

Short-term stimulation by arginine vasopressin (AVP) alters aquaporin-3 (AQP3) diffusion in the kidney collecting duct. This change in AQP3 behavior may facilitate increased water reabsorption during hydration.

Keywords:
AQP3AVPMDCKaquaporinimage correlation spectroscopykICSkidneysingle particle trackingurinevasopressin

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Cell Biology

Background:

  • Urine concentration is regulated in the renal collecting duct via arginine vasopressin (AVP) stimulation.
  • AVP triggers aquaporin-2 (AQP2) vesicle insertion into the apical membrane, increasing water reabsorption.
  • Basolateral aquaporin-3 (AQP3) and aquaporin-4 (AQP4) facilitate water exit; AQP3 diffusion may be short-term regulated.

Purpose of the Study:

  • To investigate if AQP3 diffusion is short-term regulated by AVP.
  • To measure AQP3 diffusion coefficients upon stimulation with forskolin, an AVP mimic.

Main Methods:

  • k-Space image correlation spectroscopy (kICS) analysis of AQP3-EGFP in time-lapse imaging.
  • Quantum dot-conjugated antibody labeling to assess AQP3 diffusion.
  • Immunoelectron microscopy to evaluate AQP3 expression and localization.

Main Results:

  • Forskolin significantly increased AQP3 diffusion coefficient by 58% (0.0147 to 0.0232 μm(2)/s) via kICS.
  • Quantum dot labeling showed a 44% increase in AQP3 diffusion upon forskolin treatment.
  • No significant changes in AQP3-EGFP expression or plasma membrane localization were observed.

Conclusions:

  • Increased cAMP levels, mimicking AVP action, alter AQP3 diffusion dynamics.
  • This altered diffusion may represent a short-term adaptation of basolateral water transport.
  • Findings suggest a novel mechanism for regulating water reabsorption in the renal collecting duct.