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Related Concept Videos

Parenteral Anesthetics: Overview01:24

Parenteral Anesthetics: Overview

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Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
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Depolarizing Blockers: Pharmocokinetics01:19

Depolarizing Blockers: Pharmocokinetics

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Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...
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Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

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Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
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Skeletal Muscle Relaxants: Adverse Effects01:21

Skeletal Muscle Relaxants: Adverse Effects

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Skeletal muscle relaxants are widely used for muscle paralysis and relieving pain following any muscle injury or stiffness. However, depending on the drug type, they can have adverse effects that range from mild to severe. Usually, nondepolarizing neuromuscular blockers have minimal side effects. For example, drugs like d-tubocurarine, cisatracurium, and rocuronium cause hypotension, whereas drugs like baclofen, when stopped abruptly, can lead to the recurrence of spastic conditions.
Unlike...
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The Electron Transport Chain01:30

The Electron Transport Chain

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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
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Local Anesthetics: Mechanism of Action01:23

Local Anesthetics: Mechanism of Action

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Local anesthetics (LAs) block sensory and motor impulses by inhibiting the sodium channels on the nerve cell membranes. This induces temporary loss of sensation, relieving pain in a specific body area.
Local anesthetics are amphiphilic molecules consisting of a hydrophobic aromatic part linked to a hydrophilic group by an ester or amide linkage. They are weak bases and are usually available as salts, which increases their solubility and stability. Once administered, LAs exist in the body either...
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Related Experiment Video

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Use of Stopped-Flow Fluorescence and Labeled Nucleotides to Analyze the ATP Turnover Cycle of Kinesins
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Common general anesthetic propofol impairs kinesin processivity.

Brandon M Bensel1,2, Stephanie Guzik-Lendrum1,2, Erin M Masucci1,2

  • 1Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180.

Proceedings of the National Academy of Sciences of the United States of America
|May 10, 2017
PubMed
Summary

Propofol, a common anesthetic, inhibits key kinesin motor proteins in the central nervous system (CNS). This action reduces their travel distance, potentially explaining some anesthetic effects beyond traditional targets.

Keywords:
allosteric inhibitoranesthesiaetomidateketaminemicrotubule

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Cell Biology

Background:

  • Propofol is a widely used intravenous anesthetic.
  • While known to affect GABAA receptors, its full mechanism remains unclear.
  • Anesthetic interactions with the cytoskeleton and molecular motors are under-explored.

Purpose of the Study:

  • Investigate novel targets of propofol in the central nervous system (CNS).
  • Explore the role of molecular motors, specifically kinesins, as potential targets for propofol.
  • Elucidate the impact of propofol on kinesin motor protein function.

Main Methods:

  • Utilized single-molecule assays to study kinesin motor proteins (KIF5B, KIF3AB, KIF3AC).
  • Measured the effect of propofol on kinesin processivity (stepping distance) and velocity.
  • Determined propofol's half-maximal effective concentration (EC50) for inhibiting kinesin function.

Main Results:

  • Propofol significantly inhibited conventional kinesin-1 (KIF5B) and kinesin-2 (KIF3AB/AC).
  • Kinesin processive stepping distance was reduced by 40-60% at propofol concentrations <100 nM.
  • Propofol did not affect kinesin velocity, suggesting a non-ATP site interaction.

Conclusions:

  • Propofol inhibits CNS kinesin motors, impacting anterograde transport.
  • This inhibition of microtubule-based motors represents a novel mechanism of anesthetic action.
  • A transient allosteric site on kinesin may be involved in propofol's inhibitory effect.