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Related Concept Videos

Structure-Activity Relationships and Drug Design01:28

Structure-Activity Relationships and Drug Design

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Drug design is a dynamic field that involves discovering and developing new medications based on specific biological targets. This process heavily relies on structure-activity relationships (SAR) and quantitative structure-activity relationships (QSAR) to guide the design and optimization of efficient drugs.
SAR studies the intricate relationship between a drug's chemical structure and biological activity. It focuses on understanding how modifications to a drug's structure can influence...
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Local Anesthetics: Chemistry and Structure-Activity Relationship01:30

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Local anesthetics (LAs) are drugs that induce a temporary loss of sensation in a limited body area, preventing pain. Cocaine was the first local anesthetic discovered in the late 19th century. Cocaine is a benzoic acid ester obtained from the leaves of coca shrubs and was often used for its psychotropic effects. Cocaine was first isolated in 1860 by Albert Niemann. Sigmund Freud studied the physiological actions of cocaine. Carl Koller later introduced it into clinical practice in 1884 as a...
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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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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

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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.
Separation of...
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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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Related Experiment Video

Updated: Feb 7, 2026

Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors
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Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors

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Bifidenone: Structure-Activity Relationship and Advanced Preclinical Candidate.

Zhongping Huang1, Russell B Williams2, Steven M Martin2

  • 1Albany Molecular Research Inc. , 1001 Main Street , Buffalo , New York 14203 , United States.

Journal of Medicinal Chemistry
|July 12, 2018
PubMed
Summary
This summary is machine-generated.

Bifidenone, a natural tubulin inhibitor, shows promise in cancer treatment. Synthesized analogues were tested, with compounds 45b and 46b demonstrating significant efficacy in preclinical cancer models.

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Area of Science:

  • Natural Products Chemistry
  • Medicinal Chemistry
  • Cancer Biology

Background:

  • Bifidenone is a novel natural tubulin polymerization inhibitor with antiproliferative activity against human cancer cell lines.
  • Previous synthetic routes were established to address limited supply from natural sources.

Purpose of the Study:

  • To synthesize and evaluate bifidenone analogues for anticancer properties.
  • To investigate the structure-activity relationship (SAR) of bifidenone derivatives.
  • To identify potent analogues with improved efficacy and overcome drug resistance.

Main Methods:

  • Synthesis of 42 bifidenone analogues based on a previously published route.
  • In vitro cytotoxicity assays against various human cancer cell lines.
  • In vivo evaluation using murine xenograft models.
  • Pharmacokinetic studies to assess drug disposition.
  • Assessment of activity against taxane-resistant cancer cell lines.

Main Results:

  • Compounds 45b and 46b exhibited promising efficacy in murine xenograft experiments.
  • Compound 46b demonstrated significantly more potent in vitro antiproliferative activity against taxane-resistant cell lines compared to paclitaxel.
  • Structure-activity relationship analysis guided the identification of potent derivatives.

Conclusions:

  • Bifidenone derivatives represent a promising class of anticancer agents.
  • Compounds 45b and 46b warrant further investigation for cancer therapy.
  • The identified analogues show potential for overcoming taxane resistance in cancer treatment.