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Related Concept Videos

Diabetic Neuropathy01:22

Diabetic Neuropathy

DefinitionDiabetic neuropathy is nerve damage caused by long-standing diabetes mellitus. It results directly from prolonged high blood sugar levels.PathophysiologyThe pathophysiology of diabetic neuropathy involves both metabolic and vascular disturbances triggered by chronic hyperglycemia.Metabolic injury: Elevated glucose levels activate the polyol pathway within nerve cells, leading to the accumulation of sorbitol and fructose. This increases oxidative stress, disrupts normal nerve...
Drugs Acting on Autonomic Ganglia: Stimulants01:23

Drugs Acting on Autonomic Ganglia: Stimulants


Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating sympathetic or...
Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

Local Anesthetics: Differential Sensitivity of Nerve Fibers

Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
Drugs Affecting Neurotransmitter Synthesis01:29

Drugs Affecting Neurotransmitter Synthesis

Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
Drugs Acting on Autonomic Ganglia: Blockers01:28

Drugs Acting on Autonomic Ganglia: Blockers

Ganglionic blockers inhibit autonomic activity by blocking nicotinic receptors in the autonomic ganglia, suppressing impulse transmission. These blockers lack selectivity between sympathetic and parasympathetic ganglia and are ineffective as neuromuscular junction antagonists. They can be categorized into two groups:
Neurochemical Transmission: Sites of Drug Action01:26

Neurochemical Transmission: Sites of Drug Action

Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...

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Related Experiment Video

Updated: Jul 14, 2026

The Sciatic Nerve Cuffing Model of Neuropathic Pain in Mice
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The Sciatic Nerve Cuffing Model of Neuropathic Pain in Mice

Published on: July 16, 2014

Neuroactive steroids and peripheral neuropathy.

Ilaria Roglio1, Silvia Giatti, Marzia Pesaresi

  • 1Department of Endocrinology and Center of Excellence on Neurodegenerative Diseases, University of Milan, Via Balzaretti 9, 20133, Milan, Italy.

Brain Research Reviews
|June 5, 2007
PubMed
Summary

Neuroactive steroids show promise for treating peripheral neuropathy. These compounds protect and regenerate nerves by influencing Schwann cell function and myelin protein expression.

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Area of Science:

  • Neurobiology
  • Endocrinology
  • Neurology

Background:

  • Peripheral neuropathy is a common disorder with limited effective treatments.
  • Neuroactive steroids are endogenously produced in peripheral nerves.
  • These steroids interact with specific receptors in nerve tissues.

Purpose of the Study:

  • To investigate the therapeutic potential of neuroactive steroids for peripheral neuropathy.
  • To explore the mechanisms by which neuroactive steroids affect nerve health.

Main Methods:

  • Review of existing observations and experimental models of neuropathy.
  • Analysis of neuroactive steroid synthesis, metabolism, and receptor expression in peripheral nerves.
  • Evaluation of neuroactive steroid effects on Schwann cell function and myelin protein expression.

Main Results:

  • Neuroactive steroids modulate key transcription factors for Schwann cell function.
  • They regulate Schwann cell proliferation and promote myelin protein expression (e.g., myelin protein zero, peripheral myelin protein 22).
  • Neuroactive steroids counteract nerve damage in models of aging, diabetic neuropathy, and physical injury.

Conclusions:

  • Neuroactive steroids represent a promising therapeutic strategy for peripheral neuropathy.
  • Agents that increase neuroactive steroid levels or target their receptors warrant further investigation for clinical application.