Glucose Stimulation Response
Glucose Stimulation Response - Related Videos
08:03
Glucose Uptake Measurement and Response to Insulin Stimulation in In Vitro Cultured Human Primary Myotubes
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Cited by 14 •
2017
In this method, human primary muscle cells are cultured in vitro to obtain differentiated myotubes and glucose uptake rates are measured. We provide a detailed protocol to quantify rates in basal and insulin-stimulated states using radiolabeled [3H] 2-deoxy-D-Glucose.
04:41
Glucose-Stimulated Insulin Secretion via Perfusion through the Mice Vasculature with an Intact Pancreas
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2025
Here, we provide details on performing glucose-stimulated insulin secretion (GSIS) via perfusion through the mice vasculature with an intact pancreas as an additional technique to assess the endocrine pancreatic function with reduction of possible confounders.
05:52
In Vitro Glucose Depletion Assay: A Fluorescence-Based Method to Quantify Cellular Glucose Uptake via Extracellular Glucose Depletion Measurement
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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.
04:05
Transcranial Magnetic Stimulation for Modulating Muscle Response in Humans
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2025
Source: Kuhn, Y. et al. Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention. J. Vis. Exp. (2017)This video demonstrates the use of transcranial magnetic stimulation (TMS) to modulate motor neuron activity and measure muscle responses via electromyography (EMG). It outlines the steps for locating the motor hotspot, determining stimulation thresholds, and assessing the effects of subthreshold TMS (subTMS) on cortical inhibition.
04:09
Continuous Theta Burst Stimulation to Reduce Responses to Ideological Threats
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2025
Source: Holbrook, C., et al. Continuous Theta Burst Stimulation of the Posterior Medial Frontal Cortex to Experimentally Reduce Ideological Threat Responses. J. Vis. Exp. (2018)This video demonstrates the application of continuous theta burst stimulation (cTBS) to modulate responses to ideological threats. Electromyography (EMG) electrodes record motor signals, while a magnetic coil stimulates the primary motor cortex to determine the active motor threshold (aMT). The coil is then repositioned...
FAQs
Glucose metabolism in pancreatic beta cells changes the ATP-to-ADP ratio, linking nutrient availability to electrical activity. As ATP becomes relatively more abundant, ATP-sensitive potassium channels close. The resulting reduction in potassium conductance depolarizes the cell membrane, which opens voltage-gated calcium channels and creates the calcium signal required for insulin release.
Calcium influx serves as the immediate intracellular trigger connecting membrane depolarization with insulin secretion. Glucose metabolism alone does not complete the signaling sequence; it first alters ion-channel activity and membrane voltage. Opening of voltage-gated calcium channels allows calcium to enter beta cells, indicating that calcium entry is a critical functional step in secretion.
An impaired response can indicate that beta cells are not appropriately coupling elevated glucose to insulin production or release. Because the response reflects glucose sensing, metabolic signaling, ion-channel changes, and calcium entry, its measurement provides information about insulin regulation and beta-cell performance rather than glucose concentration alone.
A glucose challenge exposes the system to elevated glucose and allows the resulting insulin response to be evaluated. The measured reaction can help determine whether beta cells respond appropriately to the stimulus. In medical and experimental settings, this approach supports assessment of insulin regulation, impaired glucose control, and broader metabolic health.
A glucose-stimulated insulin secretion assay examines how beta cells respond when exposed to elevated glucose under experimental conditions. The resulting insulin secretion provides a functional readout of glucose sensing and beta-cell activity. Researchers can use this information to investigate altered insulin regulation and to evaluate strategies intended to preserve or restore insulin production.
In medicine, these evaluations help connect cellular beta-cell behavior with impaired glucose control. They support diabetes research by characterizing insulin regulation, investigating whether insulin production is compromised, and examining therapeutic strategies aimed at preserving or restoring beta-cell function. The resulting measurements can therefore inform both disease investigation and treatment development.