Tubular Transporters
Tubular Transporters - Related Videos
01:45
Vesicular Tubular Clusters
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2023
After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi. With the help of motor proteins such...
01:28
Tubular Reabsorption and Secretion
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2025
Tubular secretion and reabsorption are two critical processes in the nephron tubule of the kidneys. When the fluid filtered from the glomerulus enters the proximal convoluted tubule, it is referred to as filtrate, and its composition changes due to tubular reabsorption and secretion. Tubular reabsorption is a selective process that starts when the filtrate enters the proximal tubules. It involves substances traveling through the transcellular route (through the tubule cell and peritubular...
06:32
Development of Human Renal Tubular Epithelial Cell Primary Cultures in Monolayers and Three-Dimensional Conditions
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2025
Here, we describe the protocols for obtaining primary cultures of human renal tubular epithelial cells (HRTEC) from the kidney cortex to develop monolayers and three-dimensional cultures on an extracellular matrix (3D-HRTEC).
06:14
Assessment of Mitochondrial Fission/Fusion Dynamics in Kidney Proximal Tubular Cells
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2025
This article describes the use of confocal microscopy and ImageJ to assess mitochondrial fission/fusion dynamics via Dendra2 photo-switching fluorescence.
06:23
Modeling Hypoxia/Reoxygenation Injury in Proximal Tubular Epithelial Cells
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2025
Here, we describe an in vitro protocol to model hypoxia/reoxygenation damage in the highly metabolic proximal tubular epithelial cells. This model is designed to induce metabolic stress-induced damage, which can be measured through the expression of proximal tubule damage markers and assessment of mitochondrial respiratory function.
FAQs
Transport must be coordinated across both sides of each epithelial cell. Transporters on the apical membrane interact with tubular fluid, while basolateral transporters support movement toward or away from the surrounding tissue and circulation. This organization allows reabsorbed substances to leave tubular fluid efficiently and enables selected compounds to enter the fluid for secretion.
Ion gradients provide driving forces for some transport processes, whereas energy-dependent mechanisms can move substances against those gradients. Facilitated diffusion offers another route when movement follows an available gradient. These differences determine how electrolytes, nutrients, metabolites, and drugs are handled and help explain why transporter activity can affect urine composition and fluid regulation.
The direction of net movement depends on the transporter’s location, mechanism, and transported substance. Reabsorption returns valuable electrolytes, nutrients, or metabolites from tubular fluid, while secretion transfers selected compounds into that fluid. Together, these opposing functions allow the renal tubules to adjust the composition of fluid that ultimately becomes urine.
Changes in transporter function can influence electrolyte balance, acid-base balance, urine formation, and drug clearance. Because these proteins participate in moving solutes through renal tubules, altered activity may change how the kidneys conserve substances or remove compounds. Their effects therefore connect cellular membrane transport with broader clinical measures of renal and metabolic function.
Medicines that target tubular transporters can modify the movement of sodium, glucose, or other solutes across renal tubular epithelium. By changing reabsorption or secretion, they can influence the substances retained in the body or delivered into tubular fluid. This pharmacologic control makes transporter activity relevant to treatment strategies and drug-response research.
Disrupted transporter function can interfere with the coordinated handling of electrolytes, nutrients, metabolites, or drugs in renal tubules. Such disruption may contribute to abnormal fluid composition, altered urine formation, or impaired drug clearance. Studying these proteins helps connect molecular transport defects with inherited or acquired kidney disease and supports renal disease research.