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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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The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
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Structural Modifications of Matrine-Type Alkaloids.

Xiao-Hua Cai1, Hui Guo2, Bing Xie1

  • 1National School of Medicine, Guizhou Minzhu University, Guiyang 550025, China.

Mini Reviews in Medicinal Chemistry
|November 9, 2016
PubMed
Summary

Matrine-type alkaloids from Sophora species offer therapeutic benefits. Recent structural modifications enhance their activity and pharmacokinetic properties, expanding potential applications.

Keywords:
BioactivitiesChinese traditional medicinematrinematrine-type alkaloidssophoridinestructural modifications.

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Area of Science:

  • Natural Products Chemistry
  • Medicinal Chemistry
  • Pharmacology

Background:

  • Matrine-type alkaloids, quinolizidine analogues from Sophora species, exhibit diverse therapeutic properties.
  • These compounds have garnered significant research interest due to their pharmacological potential.
  • Previous studies highlight the need for improved efficacy and broader applications of these natural products.

Purpose of the Study:

  • To review recent advancements in the structural modification of matrine-type alkaloids.
  • To explore how synthetic alterations impact biological activities and pharmacokinetic profiles.
  • To understand the structure-activity relationships (SAR) of semi-synthetic matrine derivatives.

Main Methods:

  • Literature review focusing on semi-synthetic matrine-type alkaloids.
  • Analysis of structural modifications at key positions (e.g., C-13, C-14).
  • Examination of changes in D ring structure (opening, fusion) and overall simplification.

Main Results:

  • Structural modifications have led to enhanced biological activities.
  • Improved pharmacokinetic properties were observed in several derivatives.
  • SAR studies provide insights into mechanisms of action and molecular targets.
  • Specific modifications include C-13/C-14 alterations, D ring manipulation, and simplification.

Conclusions:

  • Structural modification is a key strategy to optimize matrine-type alkaloids for therapeutic use.
  • Understanding SAR is crucial for rational drug design and development.
  • These modified alkaloids show promise for expanded clinical applications.