Related Experiment Video
Updated: Jul 11, 2026
08:32
Studying the Hypothalamic Insulin Signal to Peripheral Glucose Intolerance with a Continuous Drug Infusion System into the Mouse Brain
Published on: January 4, 2018
Insulin inhibits norepinephrine overflow from peripheral sympathetic nerve ending
1Fourth Department of Internal Medicine, University of Tokyo School of Medicine, Japan.
Biochemical and Biophysical Research Communications
|October 15, 1992
Summary
Insulin reduces sympathetic nerve activity by decreasing norepinephrine release in rat mesenteric arteries. This effect is likely mediated by enhanced norepinephrine reuptake.
Area of Science:
- Neuroscience
- Endocrinology
- Physiology
Background:
- The impact of insulin on the peripheral nervous system remains largely unexplored.
- Understanding insulin's role in sympathetic nerve function is crucial for metabolic and cardiovascular health.
Purpose of the Study:
- To investigate the effects of insulin on sympathetic nerve activity.
- To determine the mechanism by which insulin influences norepinephrine release.
Main Methods:
- Sympathetic nerve activity was assessed by measuring norepinephrine (NE) overflow in isolated rat mesenteric arteries via electrical stimulation.
- Dose-dependent effects of insulin on NE release were evaluated.
- The influence of cocaine and ouabain on insulin's effect was examined.
Main Results:
- Insulin significantly decreased norepinephrine release in a dose-dependent manner.
- The inhibitory effect of insulin on NE release was reversed by cocaine and ouabain.
- These findings suggest an involvement of NE reuptake mechanisms.
Conclusions:
- Insulin attenuates norepinephrine overflow from peripheral sympathetic nerve endings.
- Enhanced norepinephrine reuptake is the probable mechanism underlying insulin's inhibitory effect.
- This study provides novel insights into the neuro-endocrine interactions of insulin.
More Related Videos
07:30Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion
Published on: May 10, 2018
06:30Quantifying Acute Changes in Renal Sympathetic Nerve Activity in Response to Central Nervous System Manipulations in Anesthetized Rats
Published on: September 11, 2018
Related Concept Videos
01:27Adrenergic Neurons: Neurotransmission
Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
Synthesis: Catecholamine synthesis requires tyrosine, which is taken...
Synthesis: Catecholamine synthesis requires tyrosine, which is taken...
01:25Adrenergic Agonists: Indirect-Acting Agents
Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...
01:21Drugs Affecting Neurotransmitter Release or Uptake
Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
01:31Sympathetic Signaling
Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
01:16Sympathetic Activation
The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
01:27Glucose Homeostasis: Pancreatic Islets and Insulin Secretion
The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are co-secreted in...
Insulin and C-peptide are co-secreted in...