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Related Concept Videos

Aquaporins01:25

Aquaporins

6.9K
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

Reabsorption and Secretion in the DCT and Collecting Duct

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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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Regulation of Water Output01:26

Regulation of Water Output

2.5K
The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...
2.5K
Regulation of Water Intake01:25

Regulation of Water Intake

3.0K
Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
3.0K
Physiology of the Genitourinary System III: Urine Concentration and Dilution01:20

Physiology of the Genitourinary System III: Urine Concentration and Dilution

1.2K
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...
1.2K
ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

5.1K
V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
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Tracking Single Proteins in Lipid Bilayers Using Fluorescence Microscopy
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Detecting Aquaporin Function and Regulation.

Ana Madeira1, Teresa F Moura2, Graça Soveral3

  • 1Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa Lisboa, Portugal.

Frontiers in Chemistry
|February 13, 2016
PubMed
Summary

Aquaporins facilitate water and solute transport, crucial for cell function and health. This review details methods to study aquaporin activity, aiding in developing new diagnostics and therapeutics.

Keywords:
aquaglyceroporinaquaporinchannelglycerolinhibitionmembraneregulationwater permeability

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Physiology

Background:

  • Water and solute transport across cell membranes are vital for osmoregulation and energy balance.
  • Aquaporins (water channels) are integral membrane proteins found in nearly all organisms, facilitating bidirectional movement of water and small solutes.
  • Dysfunction of aquaporins is linked to various diseases, highlighting their therapeutic and diagnostic potential.

Purpose of the Study:

  • To review established assays for assessing aquaporin function in cellular and tissue models.
  • To describe experimental biophysical strategies for evaluating aquaporin regulation and identifying modulators.
  • To provide a foundation for aquaporin-based drug discovery.

Main Methods:

  • Review of established cell-based assays for aquaporin functional analysis.
  • Description of biophysical techniques to measure water and solute permeability.
  • Discussion of methods for identifying aquaporin activity modulators.

Main Results:

  • Established assays effectively detect aquaporin function and water/solute permeability.
  • Biophysical strategies reveal aquaporin regulation and enable modulator screening.
  • The reviewed methods are essential first steps for aquaporin drug discovery.

Conclusions:

  • Accurate assessment of aquaporin function is critical for understanding their biological roles and disease implications.
  • Established and biophysical methods are key to validating aquaporin function and identifying potential therapeutic targets.
  • This review provides a comprehensive guide to aquaporin functional analysis, supporting the development of novel diagnostics and therapeutics.