Sodium-dependent Transport
Sodium-dependent Transport - Related Videos
12:25
Isolation of Physiologically Active Thylakoids and Their Use in Energy-Dependent Protein Transport Assays
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Cited by 5 •
2018
We present protocols herein for high-yield isolation of physiologically active thylakoids and protein transport assays for the chloroplast twin arginine translocation (cpTat), secretory (cpSec1), and signal recognition particle (cpSRP) pathways.
09:41
Concentration Dependence - Student Protocol
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Concentration DependenceExpand In this experiment, you will combine varying concentrations of aqueous HCl and sodium thiosulfate to make solid sulfur, which rapidly gathers into opaque yellow particles at a certain sulfur concentration. Since the reaction solution starts clear and colorless, you can easily tell when it reaches that concentration. You'll use the same test tube and total volume each time, so it will take the same amount...
05:08
Concentration Dependence - Instructor Prep
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Preparation of SolutionsExpand Here, we show the preparation of solutions for 10 students working in pairs, with some excess. Please adjust quantities as needed. Put on a lab coat, splash-proof safety glasses, and nitrile gloves. Obtain a waste container for aqueous sodium thiosulfate in advance. Note: HCl is toxic and highly corrosive, and sodium thiosulfate is an irritant, so the solutions for this lab must be prepared in a...
01:26
Regulation of Sodium and Potassium
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2024
The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP). Sodium Regulation Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily in...
01:32
Transport and Acclimatization of Rodents for Research
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2026
All animal procedures described here must be conducted in accordance with institutional animal ethics guidelines and approved by IACUC. All procedures must follow the principles of the 3Rs—Replacement, Reduction, and Refinement—and must be performed by trained personnel. Transporting rodents for research requires procedures that minimize stress and maintain animal welfare during movement to minimize the influence on experimental outcomes. Transport cages should provide adequate ventilation,...
FAQs
The Na+/K+-ATPase actively exports sodium from the cell, maintaining a low intracellular sodium concentration. This unequal distribution stores electrochemical energy across the membrane. Transport proteins can then draw on that sodium gradient to move other substances, linking active ion pumping to secondary transport processes involved in cellular physiology and membrane-protein studies.
In symport, sodium and another substrate cross the membrane together in the same direction, allowing sodium movement to support substrate uptake. In antiport, sodium movement is coupled to exchange in the opposite direction. This distinction determines whether a transporter coordinates co-uptake or exchange and helps interpret how membrane proteins regulate cellular composition.
Transport is influenced by sodium’s electrochemical gradient, which represents the combined effect of its concentration difference and electrical conditions across the membrane. The low intracellular sodium established by the Na+/K+-ATPase contributes to this gradient, enabling sodium-linked transporters to drive movement of substrates or exchange ions according to their coupling mechanism.
These assays can help determine whether a membrane protein supports sodium-linked movement and whether its activity relates to substrate uptake or ion exchange. The resulting information contributes to characterization of transport mechanisms, including roles in nutrient uptake, ion balance, and epithelial transport, making the assays useful in biological techniques focused on membrane function.
Researchers can apply these studies to investigate drug action and transport defects associated with disease. Changes in sodium-linked movement may help connect a membrane protein’s activity with altered nutrient handling, ion balance, or epithelial function. Such findings can provide mechanistic context for evaluating how compounds or disease-related changes affect cellular transport.
In epithelial systems, sodium-coupled movement helps researchers examine how nutrients and ions are transported across cells and tissues. Understanding these mechanisms also supports the design of targeted delivery strategies, because transporter behavior can reveal ways to associate cargo movement with established sodium-driven uptake pathways. The same framework connects basic physiology with applied biological research.