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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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The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
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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 glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
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The kidneys are vital organs responsible for regulating blood filtration, waste excretion, and fluid balance, all of which are crucial for maintaining homeostasis. Renal physiology examines renal blood flow, glomerular filtration, and urine formation, ensuring the body’s internal environment remains stable.Renal Blood FlowThe kidneys receive about 20-25% of the cardiac output, typically around 1200 mL of blood per minute in an average adult. Blood flows into the kidneys through the renal...
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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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Tubular reabsorption, a process occurring post-glomerular filtration of drugs in the renal tubule, is a critical determinant of drug half-life. During the process of renal excretion, as the glomerular filtrate progresses to the distal convoluted tubule (DCT), drugs that are highly permeable, lipophilic, and nonionized undergo passive reabsorption from the tubular fluid into the surrounding peritubular capillaries. This reabsorption process restricts their elimination through the kidneys. This...
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Related Experiment Video

Updated: Dec 29, 2025

Hydrodynamic Renal Pelvis Injection for Non-viral Expression of Proteins in the Kidney
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Genome Engineering Renal Epithelial Cells for Enhanced Volume Transport Function.

Matthew H Wilson1,2,3, Ruth Ann Veach1, Wentian Luo1

  • 1Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, 1161 21st Ave South, S-3223 MCN, Nashville, TN 37232 USA.

Cellular and Molecular Bioengineering
|February 8, 2020
PubMed
Summary

Genome engineering using the piggyBac system enhanced renal epithelial cells for improved water and salt reabsorption. This advancement is crucial for developing implantable artificial kidney devices.

Keywords:
AquaporinKidneyMDCK cellsSodium hydrogen exchangerTransposonpiggyBac

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Area of Science:

  • Biotechnology
  • Regenerative Medicine
  • Cell Biology

Background:

  • Developing an implantable artificial kidney (IAK) requires renal epithelial cells with enhanced salt and water reabsorption capabilities.
  • Genome engineering offers a method to modify cells for improved transporter function.

Purpose of the Study:

  • To utilize the non-viral piggyBac transposon system for genome engineering renal cells.
  • To enhance sodium-hydrogen exchanger 3 (NHE3) and aquaporin-1 (AQP1) expression for improved cellular transport.

Main Methods:

  • Generated piggyBac transposon vectors for human NHE3 and AQP1 expression.
  • Evaluated transgene expression via western blot and immunofluorescence.
  • Quantitated transporter expression and surface localization using flow cytometry and biotinylation assays.
  • Assessed cellular volumetric transport using blister formation assays.

Main Results:

  • Achieved stable transposon integration and overexpression of NHE3 and AQP1 in MDCK cells.
  • Confirmed cell surface delivery of both transporters.
  • Identified clones with varying transporter expression levels.
  • Demonstrated increased volumetric transport in cells expressing AQP1 and NHE3.

Conclusions:

  • Renal epithelial cells can be successfully genome engineered for enhanced volumetric transport, a key requirement for IAK devices.
  • This study provides a foundation for engineering human kidney cells for future renal tubule cell therapies.