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Related Concept Videos

Osmoregulation in Insects01:47

Osmoregulation in Insects

Malpighian tubules are specialized structures found in the digestive systems of many arthropods, including most insects, that handle excretion and osmoregulation. The tubules are typically arranged in pairs and have a convoluted structure that increases their surface area.
Transcellular Transport of Solutes01:23

Transcellular Transport of Solutes

Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
Drug Elimination by Renal Route: Tubular Secretion01:15

Drug Elimination by Renal Route: Tubular Secretion

Once the process of glomerular filtration is completed, blood carrying unfiltered drug molecules traverses through efferent arterioles and makes its way into the peritubular capillaries in the proximal tubule. A variety of carriers play a pivotal role in actively secreting drugs from these peritubular capillaries into the tubular fluid. The organic anion transporter transfers acidic drugs, against an electrochemical gradient, from the peritubular capillaries into the renal tubule cells and...
Reabsorption and Secretion in the PCT01:28

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The Proximal Convoluted Tubule, or PCT, plays a pivotal role in the body's filtration system. They are primarily responsible for reabsorbing solutes and water from the filtered fluid produced by the glomeruli. Most of the filtered water, ions, and organic solutes such as glucose and amino acids are reabsorbed by the PCT.
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Carrier-Mediated Transport01:06

Carrier-Mediated Transport

Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
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Active tubular secretion is a robust, energy-demanding process that utilizes carrier systems to transport drugs into renal tubules. The active renal secretion systems include the organic anion transporter (OAT) for weak acids and the organic cation transporter (OCT) for weak bases. Structurally similar drugs can compete for the same transporter, potentially leading to drug accumulation and toxicity. However, this principle can be exploited therapeutically. One example is probenecid (Probalan),...

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Transepithelial transport of salicylate by the Malpighian tubules of insects from different orders.

Esau Ruiz-Sanchez1, Maria C Van Walderveen, Alexandra Livingston

  • 1Department of Biology, McMaster University, Hamilton, ONT, Canada. ruizsae@mcmaster.ca

Journal of Insect Physiology
|July 21, 2007
PubMed
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Insect Malpighian tubules transport the plant compound salicylate, aiding its elimination from the hemolymph. This process varies among species, with some tubules also metabolizing salicylate.

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Area of Science:

  • Insect Physiology
  • Plant-Insect Interactions
  • Biochemistry

Background:

  • Salicylate, a plant secondary metabolite, deters insect herbivory.
  • Insect Malpighian tubules are key excretory organs.

Purpose of the Study:

  • To investigate the transepithelial transport of salicylate by insect Malpighian tubules.
  • To compare salicylate transport mechanisms across diverse insect species.

Main Methods:

  • Salicylate-selective microelectrodes
  • Radioisotope tracer techniques
  • Comparative analysis across 10 insect species from five orders

Main Results:

  • Salicylate transport into Malpighian tubule lumen observed in 9 of 10 species.
  • Transport was saturable, Na(+)-dependent, and inhibited by alpha-cyano-4-hydroxycinnamic acid in some species (Drosophila spp., Acheta domesticus).
  • Transport was Na(+)-independent in other species (Tenebrio molitor, Plagiodera versicolora, Aedes aegypti, Trichoplusia ni).
  • Malpighian tubules showed capacity for both salicylate transport and metabolism in several species.
  • Highest salicylate elimination capacities found in Tenebrio molitor, Plagiodera versicolora, and Drosophila spp.

Conclusions:

  • Insect Malpighian tubules play a significant role in eliminating dietary salicylate.
  • Species-specific differences in salicylate transport mechanisms exist.
  • Malpighian tubule function may be crucial for insects consuming plants with high salicylate levels.