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Related Concept Videos

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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Hyperlipidemia, a medical condition often referred to as high cholesterol, is characterized by abnormally elevated levels of lipids in the bloodstream. When present in excess, these lipids, specifically cholesterol and triglycerides, can lead to serious health complications, often involving cardiovascular diseases. Illnesses like atherosclerosis, heart attacks, and pancreatitis have all been linked to untreated hyperlipidemia. This means controlling and regulating cholesterol and triglyceride...
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Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
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Chirality in Nature02:30

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Prochirality02:05

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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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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Related Experiment Video

Updated: Dec 23, 2025

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol
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Cholesterotropic and cuprotropic chemicals.

Leslie M Klevay1

  • 1School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, USA.

Journal of the Science of Food and Agriculture
|April 24, 2020
PubMed
Summary

Certain chemicals impact copper metabolism and cholesterol levels. Some substances like ascorbic acid and cadmium inhibit copper and raise cholesterol, while others like calcium and clofibrate enhance copper and lower cholesterol.

Area of Science:

  • Biochemistry
  • Metabolic pathways

Background:

  • Cholesterol and copper metabolism are crucial physiological processes.
  • Several exogenous chemicals are known to influence these metabolic pathways.
  • Understanding these interactions is vital for metabolic health research.

Purpose of the Study:

  • To investigate the modulatory effects of various chemicals on cholesterol and copper metabolism.
  • To compare the impact of different chemical agents on these interconnected metabolic systems.

Main Methods:

  • Administration of specific chemicals (ascorbic acid, cadmium, calcium, clofibrate, fenofibrate) to experimental models.
  • Monitoring and quantification of cholesterol and copper levels in biological samples.
  • Analysis of metabolic changes induced by chemical interventions.

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Main Results:

  • Ascorbic acid and cadmium were observed to inhibit copper metabolism and concurrently elevate cholesterol levels.
  • Calcium and clofibrate demonstrated an enhancement of copper metabolism, leading to a reduction in cholesterol.
  • Fenofibrate's cholesterol-lowering effect was potentially masked by severe dietary challenges (cholesterol and fructose).

Conclusions:

  • Chemicals exert significant and often opposing effects on cholesterol and copper metabolism.
  • Dietary factors can influence the efficacy of metabolic modulators like fenofibrate.
  • Further research is warranted to elucidate the precise mechanisms and therapeutic potential.