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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.
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Acid-base homeostasis is essential for maintaining normal physiological activities in humans. The pH of various body fluids is strictly regulated because it is critical for the optimal activity of enzymes involved in metabolic reactions. Enzymes are basically proteins, so, any significant change in pH can affect their structure and activity. In humans, pH is regulated using three primary mechanisms— chemical buffer systems, respiratory regulation, and renal regulation.
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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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The human body maintains a narrow pH range regulated through acid-base balance. This balance is crucial as changes in the hydrogen ion concentration can disrupt cell membrane stability, alter protein structures, and change enzyme activities. The normal pH of arterial blood is 7.4, venous blood and interstitial fluid is 7.35, and intracellular fluid averages 7.0.
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The AE4 transporter mediates kidney acid-base sensing.

H Vitzthum1, M Koch1, L Eckermann1

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|May 26, 2023
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Summary
This summary is machine-generated.

The kidney

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Area of Science:

  • Nephrology
  • Physiology
  • Molecular Biology

Background:

  • The kidney is crucial for maintaining systemic acid-base balance.
  • Intercalated cells in the distal nephron regulate acid-base status by secreting ions.
  • The sensing mechanism of these cells for acid-base disturbances remains unclear.

Purpose of the Study:

  • To investigate the role of the Na+-dependent Cl-/HCO3- exchanger AE4 (Slc4a9) in renal acid-base sensing.
  • To elucidate the mechanism by which AE4 contributes to acid-base homeostasis.

Main Methods:

  • Utilized AE4-deficient mice models.
  • Employed molecular, imaging, biochemical, and integrative approaches.
  • Assessed acid-base balance regulation in response to metabolic disturbances.

Main Results:

  • AE4-deficient mice displayed significant acid-base balance dysregulation.
  • These mice were unable to appropriately correct metabolic acidosis and alkalosis.
  • A key cellular defect identified was the lack of adaptive base secretion via pendrin (Slc26a4).

Conclusions:

  • AE4 is essential for the renal sensing of acid-base status.
  • AE4 deficiency impairs the kidney's ability to correct acid-base imbalances.
  • Dysfunctional AE4 leads to impaired pendrin-mediated base secretion, causing acid-base derangement.