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Related Concept Videos

Physical Properties of Amines01:26

Physical Properties of Amines

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Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:29

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

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Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
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Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

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Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
The direct-acting...
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Direct-Acting Cholinergic Agonists: Pharmacokinetics01:31

Direct-Acting Cholinergic Agonists: Pharmacokinetics

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Direct-acting cholinergic agonists, such as synthetic choline esters and naturally occurring alkaloids, exert their effects by enhancing the actions of acetylcholine and stimulating the parasympathetic nervous system. Synthetic choline esters share structural similarities with acetylcholine. For example, they have a positively charged quaternary ammonium or onium group, contributing to their hydrophilic characteristics. As a result, they are poorly absorbed in the body through oral...
2.0K
Indirect-Acting Cholinergic Agonists: Mechanism of Action01:18

Indirect-Acting Cholinergic Agonists: Mechanism of Action

2.8K
Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
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Cholinergic Antagonists: Chemistry and Structure-Activity Relationship01:29

Cholinergic Antagonists: Chemistry and Structure-Activity Relationship

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Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic...
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Related Experiment Video

Updated: May 5, 2026

Establishing an Octopus Ecosystem for Biomedical and Bioengineering Research
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Establishing an Octopus Ecosystem for Biomedical and Bioengineering Research

Published on: September 22, 2021

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Arylalkylamines inOctopus tissues.

A V Juorio1, S R Philips

  • 1Psychiatric Research Division, University Hospital, S7N OW8, Saskatoon, Saskatchewan, Canada.

Neurochemical Research
|November 26, 2013
PubMed
Summary
This summary is machine-generated.

This study analyzed biogenic amines in the octopus nervous system. Pargyline treatment increased specific amines in optic lobes but not salivary glands, suggesting localized roles.

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Area of Science:

  • Neuroscience
  • Marine Biology
  • Biochemistry

Background:

  • Biogenic amines are crucial neurotransmitters and neuromodulators in nervous systems.
  • Phenylethylamines and indoleamines are classes of biogenic amines with diverse physiological roles.
  • Understanding amine distribution and metabolism in invertebrates like Octopus provides insights into nervous system function.

Purpose of the Study:

  • To quantify and compare levels of various phenylethylamines and indoleamines in specific octopus tissues.
  • To investigate the metabolic effects of pargyline, an inhibitor of monoamine oxidase, on these amines.
  • To infer the potential functional roles of these amines in octopus nervous tissue.

Main Methods:

  • Analysis of biogenic amine content in the circumesophageal ganglia (optic lobes) and posterior salivary gland of Octopus dofleini martini.
  • Use of pargyline treatment to assess the impact on amine levels.
  • Quantification of β-phenylethylamine, m-tyramine, p-tyramine, octopamine, dopamine, noradrenaline, 5-hydroxytryptamine, and tryptamine.

Main Results:

  • β-Phenylethylamine, m-tyramine, and tryptamine were detected in optic lobes and posterior salivary glands, with varying concentrations.
  • Higher levels of p-tyramine, octopamine, dopamine, noradrenaline, and 5-hydroxytryptamine were observed compared to the first three amines.
  • Pargyline administration significantly elevated β-phenylethylamine, m-tyramine, p-tyramine, and tryptamine levels in optic lobes, but not in the posterior salivary gland.

Conclusions:

  • The differential distribution and metabolic response to pargyline suggest distinct roles for these biogenic amines in octopus nervous tissue.
  • The rapid metabolism of certain amines points to their active involvement in neuronal function.
  • Further research is warranted to elucidate the specific functions of these amines in Octopus neurobiology.