Proximal Tubule Reabsorption
Proximal Tubule Reabsorption - Related Videos
07:06
Isolation of Primary Human Proximal Tubule Epithelial Cells and Their Use in Creating a Microphysiological Model of the Renal Proximal Tubule
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Cited by 3 •
2025
We present an optimized protocol for processing whole human kidneys to isolate and culture primary renal proximal tubule epithelial cells and the application of these cells in a three-dimensional, microfluidic, microphysiological platform to recapitulate the renal proximal tubule.
05:11
Malpighian Tubule Dissection from an Adult Fly: Isolating an Osmoregulatory and Excretory Organ
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2023
This article describes the dissection of the anterior Malpighian tubules (MT) from a female Drosophila fly and an example protocol from Rossano et al. (2017) in which the MTs are prepared for live imaging in a perfusion chamber.
04:25
Isolation of Immune Regulatory Sertoli Cells from Mouse Seminiferous Tubules
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2025
This video demonstrates the isolation procedure of Sertoli cells from mouse seminiferous tubules, a component of the testes. Enzymatic digestion and repeated washes promote the release of Sertoli cells into the solution, which can be cultured further for proliferation and growth.
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...
01:28
Reabsorption and Secretion in the PCT
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2025
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. Transport mechanisms involving sodium ions (Na+) contribute significantly to solute reabsorption. These mechanisms include symport and antiport processes. A key example is the...
FAQs
It maintains a sodium gradient across proximal tubule epithelial cells by moving sodium and potassium across the basolateral membrane. That gradient supplies the driving force for apical cotransport of glucose, amino acids, phosphate, and bicarbonate. Consequently, activity at the basolateral membrane organizes uptake of several filtered solutes rather than acting as an isolated transport event.
As solutes are transported across proximal tubule epithelium, water follows osmotically. The movement can occur through the cells or through paracellular pathways between them, linking solute transport with fluid recovery. Considering both routes is important when interpreting how this nephron segment contributes to blood volume and overall chemical homeostasis.
Bicarbonate is among the filtered solutes whose reabsorption is supported by sodium-dependent apical cotransport. Its recovery therefore links epithelial transport to preservation of the body's chemical balance. Studying this connection helps explain why the proximal tubule is relevant to acid-base regulation, rather than viewing it only as a nutrient-recovery site.
It provides a framework for examining how filtered sodium-dependent transport coordinates recovery of glucose, amino acids, phosphate, bicarbonate, and water. Because these movements affect blood volume, electrolyte balance, and chemical homeostasis, the process connects cellular epithelial mechanisms with whole-kidney physiological function and helps organize investigations of renal physiology.
The process gives drug-handling studies a defined renal context: epithelial cells use a basolateral sodium gradient to support apical transport, while water can move through cellular and paracellular routes. Examining this organization helps researchers relate renal drug handling to the transport architecture and homeostatic functions of the proximal tubule.
The process offers a way to investigate how changes in epithelial recovery might affect filtered nutrients, water, electrolytes, and acid-base balance. Accordingly, it serves as a renal biology context for examining diabetes and kidney injury, while linking cellular transport features, including sodium-driven cotransport, to broader questions of chemical homeostasis.