Sodium Glucose Cotransporters
Sodium Glucose Cotransporters - Related Videos
05:25
Detection of Phosphorylated Neuronal Potassium-Chloride Cotransporter 2 via Western Blotting
0 Views •
2025
Source: Josiah, S. S., et al. Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting. J. Vis. Exp. (2022).The video demonstrates the steps for detecting and quantifying phosphorylated potassium-chloride cotransporter 2 (KCC2) protein in a cell lysate. This process involves immunoprecipitation to isolate phosphorylated KCC2 and chemiluminescence to quantify the isolated protein.
11:34
A Competent Hepatocyte Model Examining Hepatitis B Virus Entry through Sodium Taurocholate Cotransporting Polypeptide as a Therapeutic Target
0 Views •
Cited by 2 •
2022
We present a protocol to screen anti-hepatitis B virus (HBV) compounds targeting pre- and post-viral entry lifecycle stages, using isothermal titration calorimetry to measure binding affinity (KD) with host sodium taurocholate cotransporting polypeptide. Antiviral efficacy was determined through the suppression of viral lifecycle markers (cccDNA formation, transcription, and viral assembly).
05:52
In Vitro Glucose Depletion Assay: A Fluorescence-Based Method to Quantify Cellular Glucose Uptake via Extracellular Glucose Depletion Measurement
0 Views •
2025
This video demonstrates an in vitro assay to indirectly measure intracellular glucose uptake. The assay uses a fluorescently-labeled glucose analog to establish a correlation between extracellular glucose depletion and intracellular glucose uptake.
02:23
Oral Glucose Tolerance Test (OGTT): Measuring Glucose Metabolism in Mice
0 Views •
2023
This video introduces how to perform an oral glucose tolerance test on a laboratory mouse.
04:11
Assessing Glucose Uptake in the Motor Neurons of Drosophila Larvae with Upregulated Glucose Metabolism
0 Views •
2025
The video demonstrates a technique for measuring glucose uptake in Drosophila larval motor neurons using a fluorescence resonance energy transfer (FRET)-based intracellular glucose sensor. After dissecting the larvae to expose the ventral nerve cord, the motor neurons are visualized through the fluorescence emitted by the sensor's donor fluorophore. When stimulated with glucose, FRET between the sensor's donor and acceptor fluorophores triggers the emission of fluorescence from the acceptor,...
FAQs
Sodium glucose cotransporters couple two movements that would not proceed in the same direction independently. Sodium moves down its electrochemical gradient through the membrane protein, and the released transport energy drives glucose against its concentration gradient. This secondary active transport mechanism allows cells to accumulate glucose even when intracellular glucose levels are relatively high.
The Na+/K+-ATPase maintains the low intracellular sodium conditions that create the driving force for cotransport. By sustaining the sodium electrochemical gradient, it indirectly supplies the energy required for glucose uptake. Without this supporting gradient, sodium movement through the transporter would lose its driving force, limiting the associated movement of glucose across the membrane.
SGLT1 and SGLT2 serve distinct physiological locations and functions. SGLT1 primarily supports glucose and galactose absorption in the small intestine, whereas SGLT2 reabsorbs most filtered glucose in the kidney. This division links one transporter mainly to nutrient acquisition and the other to renal handling of glucose, together contributing to glucose homeostasis.
Continued cotransport depends on the sodium electrochemical gradient and the availability of glucose to move through the transporter. Sodium must retain a favorable downhill pathway, while the coupled movement provides the energy for glucose transport against its gradient. The Na+/K+-ATPase is therefore important not as the glucose transporter itself, but as the system that preserves the necessary driving conditions.
In the small intestine, SGLT1 couples sodium movement to the uptake of glucose and galactose across intestinal cell membranes. This mechanism enables absorption even when the sugars must move against their concentration gradients. Its activity therefore connects membrane transport principles with nutrient acquisition, making SGLT1 a key component of intestinal physiology and dietary carbohydrate handling.
SGLT2 reabsorbs most filtered glucose in the kidney, linking cotransporter activity to renal glucose conservation and blood glucose regulation. Therapies that target these transporters can lower blood glucose by promoting urinary glucose excretion rather than retaining all filtered glucose. This application illustrates how a normal renal transport process can become a therapeutic target.