Hyperinsulinemic Clamp
Hyperinsulinemic Clamp - Related Videos
11:10
Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice
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Cited by 150 •
2011
The hyperinsulinemic-euglycemic clamp, or insulin clamp, is the gold standard for assessing insulin action in vivo. A method for performing insulin clamps in mice is described. This includes a method for arterial catheterization that permits experiments to be performed in conscious, unrestrained mice with minimal stress.
11:12
Hyperinsulinemic-Euglycemic Clamp in the Conscious Rat
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Cited by 34 •
2011
The hyperinsulinemic-euglycemic clamp is the "gold standard" for the assessment of insulin action. Insulin is infused at a constant rate stimulating glucose uptake. The amount of exogenous glucose infused to counter this drop is indicative of insulin sensitivity. Here the procedure is performed on a conscious, unrestrained rat.
09:43
Patch Clamp Electrophysiology
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2023
Neuron cell membranes are populated with ion channels that control the movement of charge into and out of the cell, thereby regulating neuron firing. One extremely useful technique for investigating the biophysical properties of these channels is called patch clamp recording. In this method, neuroscientists place a polished glass micropipette against a cell and apply suction to form a high resistance seal. This process isolates a small “patch” of membrane that contains one or more ion channels.
07:35
Hyperglycemic Clamp and Hypoglycemic Clamp in Conscious Mice
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Cited by 4 •
2024
A hyperglycemic clamp is used for measuring insulin release with a maintained higher blood glucose concentration. A hypoglycemic clamp is for measuring glucose production induced by counter-regulatory responses. Both methods use the same surgical procedure. Here, we present a clamp technique to assess systemic glucose metabolism.
01:18
Patch Clamp
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2023
Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique. In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
FAQs
The glucose infusion rate serves as the principal readout because it indicates how much exogenous glucose must be supplied while insulin action is being tested. If maintaining the selected blood-glucose level requires a greater infusion rate, the experiment records greater glucose disposal under those conditions. This rate therefore provides an estimate of whole-body insulin action.
A euglycemic target keeps blood glucose near a stable level while insulin is administered. Frequent adjustment of the glucose infusion compensates for the body's glucose disposal, allowing the required infusion rate to reflect insulin action rather than uncontrolled changes in blood glucose. This controlled condition supports assessment across different treatments or physiological conditions.
The constant insulin infusion establishes a controlled insulin exposure for the measurement. Because the insulin delivery rate remains fixed, changes in the glucose required to maintain the target can be evaluated in relation to that standardized condition. This design helps characterize how effectively the body responds to insulin and supports comparisons of insulin sensitivity.
The procedure begins by delivering insulin at a constant, controlled rate. Glucose is then infused as needed, with its delivery adjusted frequently to keep blood glucose at the selected target, usually euglycemia. The glucose infusion requirement is followed under these conditions and used to estimate glucose disposal and whole-body insulin action.
The glucose infusion rate represents the amount of infused glucose needed to preserve the target blood-glucose concentration during controlled insulin exposure. It is interpreted as an estimate of glucose disposal and, consequently, whole-body insulin action. The result can help identify differences in insulin sensitivity without treating the infusion rate as a direct measurement of one isolated process.
In medicine and metabolic research, the technique is used to characterize insulin resistance, investigate glucose regulation, and evaluate responses to treatments or physiological conditions. Its controlled insulin and glucose conditions make it useful when investigators need a reference assessment of insulin sensitivity and want to examine how metabolic responses change under defined circumstances.