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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.
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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

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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.
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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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Vitamins D: Relationship between Structure and Biological Activity.

Andrzej Kutner1, Geoffrey Brown2

  • 1Pharmaceutical Research Institute, 8 Rydygiera, Warsaw 01-793, Poland. a.kutner@ifarm.eu.

International Journal of Molecular Sciences
|July 25, 2018
PubMed
Summary
This summary is machine-generated.

New vitamin D analogues help unravel the complex actions of 1α,25-dihydroxyvitamin D₃. Studies show the A-ring conformation is crucial for vitamin D receptor interaction and biological activity.

Keywords:
cell differentiationcrystallographyvitamin Dvitamin D analoguesvitamin D receptor

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Area of Science:

  • Endocrinology and Molecular Biology
  • Cell Biology and Biochemistry

Background:

  • 1α,25-dihydroxyvitamin D₃ is the active form of vitamin D, regulating mineral homeostasis and cellular processes like growth arrest, differentiation, and apoptosis.
  • It exerts its effects by binding to the vitamin D receptor, influencing gene transcription and triggering rapid, non-transcriptional intracellular signals.
  • Despite its known functions, the precise mechanisms underlying its diverse actions, including calcemic effects and gene regulation, remain incompletely understood.

Purpose of the Study:

  • To investigate the molecular mechanisms behind the diverse actions of 1α,25-dihydroxyvitamin D₃.
  • To utilize synthetic vitamin D analogues to differentiate between its anti-proliferative and calcemic effects.
  • To understand how structural modifications in vitamin D analogues affect their interaction with the vitamin D receptor and subsequent biological activity.

Main Methods:

  • Synthesis of novel vitamin D analogues with distinct biological activity profiles.
  • Crystallographic studies to analyze structural changes in the vitamin D receptor upon ligand binding.
  • Assessment of receptor-affinity and biological activity of the synthesized analogues.

Main Results:

  • Certain synthetic analogues successfully separated the anti-proliferative and calcemic actions of 1α,25-dihydroxyvitamin D₃.
  • Studies revealed the critical role of the A-ring adopting a chair β-conformation for vitamin D receptor binding and biological efficacy.
  • Current crystallographic resolution has not yet fully elucidated the structural basis for differential receptor activity.

Conclusions:

  • Synthetic vitamin D analogues are valuable tools for dissecting the complex physiology of vitamin D.
  • The conformational state of the vitamin D analogue's A-ring is a key determinant of vitamin D receptor interaction and function.
  • Further structural and functional studies are needed to fully elucidate the mechanisms of vitamin D action.