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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.
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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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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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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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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 renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
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Renal Intercalated Cells: Alien Cells Inside Us?

Miguel Luis Graciano1

  • 1Nephrology Section, Department of Clinical Medicine, Universidade Federal Fluminense School of Medicine, Niteroi 24070-090, RJ, Brazil.

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Renal intercalated cells, vital for acid-base balance, may have evolved from ancient amoeboid cells. Their unique traits, like V-ATPases and regenerative abilities, suggest deep evolutionary roots in early eukaryotes.

Keywords:
H+V-ATPasecell energizationevolutionary cell biologymetazoan originphenotypic plasticity

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Physiology

Background:

  • Mammalian renal intercalated cells regulate acid-base balance.
  • Their unique biology and evolutionary persistence are not fully understood.

Purpose of the Study:

  • To explore the evolutionary origins of renal intercalated cells.
  • To identify unique cellular characteristics and their phylogenetic persistence.

Main Methods:

  • Review of published data on intercalated cell biology.
  • Phylogenetic analysis tracing characteristics to early organisms.

Main Results:

  • Intercalated cells share traits with ancient cells, including V-ATPase energy and T-antigens.
  • These cells exhibit plasticity, aiding kidney defense and regeneration.

Conclusions:

  • Renal intercalated cell origins may trace back to amoeboid cells or the last eukaryote common ancestor.
  • Similarities suggest ancient origins for innate immunity and regenerative capabilities in V-ATPase-expressing cells.