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Related Concept Videos

Local Anesthetics: Chemistry and Structure-Activity Relationship01:30

Local Anesthetics: Chemistry and Structure-Activity Relationship

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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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Structure-Activity Relationships and Drug Design01:28

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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.
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Cholinergic Antagonists: Chemistry and Structure-Activity Relationship01:29

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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

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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

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

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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.
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Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors
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Structure-activity relationships in nitrosamine carcinogenesis

J S Wishnok, M C Archer

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    This summary is machine-generated.

    Carcinogenic activity and toxicity in nitrosamines correlate with the number of carbon atoms per molecule. These bulk properties, not just alkyl substituents, can predict carcinogenic potential, aiding in risk assessment.

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    Area of Science:

    • Toxicology
    • Medicinal Chemistry
    • Computational Chemistry

    Background:

    • Nitrosamines are a class of chemical compounds known for their potential carcinogenicity.
    • Understanding the structure-activity relationships (SAR) of nitrosamines is crucial for predicting and mitigating their toxic effects.
    • Previous studies often focused on specific chemical substituents to explain carcinogenic activity.

    Purpose of the Study:

    • To investigate the correlation between bulk molecular properties, specifically the number of carbons per molecule, and the carcinogenic activity and toxicity of nitrosamines.
    • To determine if simple molecular properties can serve as reliable predictors of nitrosamine carcinogenicity.
    • To establish structure-activity relationships based on overall molecular characteristics.

    Main Methods:

    • Statistical analysis of a large dataset of nitrosamines.
    • Correlation analysis between molecular properties (number of carbons) and experimentally determined carcinogenic and toxicological data.
    • Evaluation of bulk molecular properties as determinants of biological activity.

    Main Results:

    • Statistically significant correlations were found between the number of carbons per molecule and both carcinogenic activity and toxicity.
    • Bulk molecular properties were identified as significant indicators of carcinogenic potential.
    • The findings suggest that alkyl substituents are not the sole factors influencing carcinogenic activity.

    Conclusions:

    • The number of carbons per molecule is a significant predictor of carcinogenic activity and toxicity in nitrosamines.
    • Simple, bulk molecular properties can be used to estimate the carcinogenic potential of nitrosamines.
    • These structure-activity relationships offer a valuable tool for preliminary risk assessment and compound screening.