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Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

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

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...
Adrenergic Agonists: Indirect-Acting Agents01:25

Adrenergic 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...
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Prodrugs

Prodrugs are a class of pharmaceutical compounds that undergo a biotransformation process within the body to be converted into a pharmacologically active drug. Prodrugs are designed to improve the therapeutic properties of the parent drug, such as enhancing bioavailability, increasing stability, or reducing toxicity. The concept of prodrugs revolves around modifying the chemical structure of the original drug to make it more effective or convenient for administration.
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Types of Hormones01:21

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Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by the specific receptors they bind to on target cells.
Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
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Cellular Membrane Affinity Chromatography Columns to Identify Specialized Plant Metabolites Interacting with Immobilized Tropomyosin Kinase Receptor B
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Bioactive 5alpha-pregnane-type steroidal alkaloids from Sarcococca hookeriana.

Krishna P Devkota1, Bruno N Lenta, Jean D Wansi

  • 1Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany. devkotakpd@yahoo.com

Journal of Natural Products
|August 7, 2008
PubMed
Summary

Two new steroidal alkaloids from Sarcococca hookeriana, hookerianamides J and K, show significant cholinesterase inhibitory properties. These compounds, along with known ones, were evaluated for their potential therapeutic applications.

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Area of Science:

  • Natural Products Chemistry
  • Pharmacology
  • Medicinal Chemistry

Background:

  • Sarcococca hookeriana is a plant with a history of traditional medicinal use.
  • Cholinesterase inhibitors are crucial for treating neurodegenerative diseases like Alzheimer's.
  • Phytochemical investigations are vital for discovering new therapeutic agents.

Purpose of the Study:

  • To isolate and characterize novel compounds from Sarcococca hookeriana with cholinesterase inhibitory activity.
  • To evaluate the in vitro efficacy of these compounds against acetylcholinesterase and butyrylcholinesterase.
  • To assess the leishmanicidal and antibacterial potential of the isolated compounds.

Main Methods:

  • Bioassay-guided phytochemical fractionation of Sarcococca hookeriana extract.
  • Structure elucidation of new compounds using advanced spectroscopic techniques (e.g., NMR, MS).
  • In vitro enzyme inhibition assays for acetylcholinesterase and butyrylcholinesterase.
  • In vitro testing for leishmanicidal and antibacterial activities.

Main Results:

  • Two new 5alpha-pregnane-type steroidal alkaloids, hookerianamides J (1) and K (2), were identified.
  • Compounds 1 and 2 exhibited good to moderate inhibitory activity against acetylcholinesterase (IC50 8.1-48.5 microM) and butyrylcholinesterase (IC50 0.4-4.0 microM).
  • All ten tested compounds (1-10) were evaluated for leishmanicidal and antibacterial effects.

Conclusions:

  • Sarcococca hookeriana is a valuable source of steroidal alkaloids with significant cholinesterase inhibitory potential.
  • Hookerianamides J and K represent promising leads for the development of new therapeutic agents targeting cholinesterase-related disorders.
  • Further research is warranted to explore the full pharmacological profile and optimize the activity of these compounds.