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Related Concept Videos

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin

Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
The binding of dantrolene to the RYR1...
Bacterial Toxins01:12

Bacterial Toxins

Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
Neuromuscular Junction And Blockade01:29

Neuromuscular Junction And Blockade

The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action01:17

Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action

Nondepolarizing neuromuscular blockers induce paralysis by competitively blocking nicotinic acetylcholine receptors at the muscle end plate. Examples include pancuronium, mivacurium, vecuronium, and rocuronium. These quaternary ammonium derivatives are administered intravenously, are poorly absorbed, and are excreted via the kidneys.
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
Although all competitive neuromuscular blockers are designed...
Skeletal Muscle Relaxants: Therapeutic Uses01:31

Skeletal Muscle Relaxants: Therapeutic Uses

Skeletal muscle relaxants are used to relax muscle tone and alleviate painful muscle contractions. However, the choice of skeletal muscle relaxants depends on the duration of the surgical procedure in order to minimize potential side effects. Skeletal muscle relaxants like neuromuscular blocking agents [NMBAs] are commonly employed as adjuvants alongside general anesthetics in clinical settings. NMBAs are also used to maintain controlled ventilation during surgery of the larynx or pharynx as...

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Related Experiment Video

Updated: May 22, 2026

Isolation and Quantification of Botulinum Neurotoxin From Complex Matrices Using the BoTest Matrix Assays
12:25

Isolation and Quantification of Botulinum Neurotoxin From Complex Matrices Using the BoTest Matrix Assays

Published on: March 3, 2014

Botulinum neurotoxin A: a review.

M G Berry1, Jan J Stanek

  • 1Surgical Aesthetics, 60 Wimpole Street, London W1G 8AG, UK. mail@aestheticus.co.uk

Journal of Plastic, Reconstructive & Aesthetic Surgery : JPRAS
|May 4, 2012
PubMed
Summary

Botulinum neurotoxin A is a popular cosmetic treatment, yet scientific literature on its aesthetic applications is surprisingly limited. This review examines its background, development, and evidence for plastic surgeons integrating non-surgical facial rejuvenation.

Area of Science:

  • Aesthetic Medicine
  • Dermatology
  • Plastic Surgery

Background:

  • Botulinum neurotoxin A is widely recognized in cosmetic applications.
  • A limited number of studies (4) focus on its cosmetic uses in major plastic surgery journals.
  • Existing research covers masseteric hypertrophy and cryoanalgesia.

Purpose of the Study:

  • To review the background, development, and scientific evidence of botulinum neurotoxin A for cosmetic use.
  • To address the gap in literature regarding its widespread application in facial rejuvenation.
  • To support plastic surgeons incorporating non-surgical treatments.

Main Methods:

  • Literature review of botulinum neurotoxin A in cosmetic applications.
  • Analysis of existing studies in JPRAS and BJPS.

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A High-throughput-compatible FRET-based Platform for Identification and Characterization of Botulinum Neurotoxin Light Chain Modulators
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A High-throughput-compatible FRET-based Platform for Identification and Characterization of Botulinum Neurotoxin Light Chain Modulators

Published on: December 27, 2013

A High Content Imaging Assay for Identification of Botulinum Neurotoxin Inhibitors
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A High Content Imaging Assay for Identification of Botulinum Neurotoxin Inhibitors

Published on: November 14, 2014

Related Experiment Videos

Last Updated: May 22, 2026

Isolation and Quantification of Botulinum Neurotoxin From Complex Matrices Using the BoTest Matrix Assays
12:25

Isolation and Quantification of Botulinum Neurotoxin From Complex Matrices Using the BoTest Matrix Assays

Published on: March 3, 2014

A High-throughput-compatible FRET-based Platform for Identification and Characterization of Botulinum Neurotoxin Light Chain Modulators
10:30

A High-throughput-compatible FRET-based Platform for Identification and Characterization of Botulinum Neurotoxin Light Chain Modulators

Published on: December 27, 2013

A High Content Imaging Assay for Identification of Botulinum Neurotoxin Inhibitors
14:10

A High Content Imaging Assay for Identification of Botulinum Neurotoxin Inhibitors

Published on: November 14, 2014

  • Synthesis of scientific evidence for non-surgical facial rejuvenation.

    • Main Results:

    • A paucity of research exists on the cosmetic applications of botulinum neurotoxin A in key surgical journals.
    • Botulinum neurotoxin A is the most frequently utilized cosmetic procedure in the United States.
    • The review highlights the need for comprehensive data on its efficacy and safety in aesthetic practice.

    Conclusions:

    • There is a significant need for more research on botulinum neurotoxin A's cosmetic applications.
    • Plastic surgeons require robust scientific evidence to integrate non-surgical treatments effectively.
    • Further investigation is crucial for advancing non-surgical facial rejuvenation strategies.