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Related Concept Videos

Overview of Fatty Acid Metabolism01:28

Overview of Fatty Acid Metabolism

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.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
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Pharmaceutical substances known as xenobiotics are predominantly lipophilic and nonionized. This enables them to permeate lipid bilayers, such as cell membranes, and interact with intracellular target receptors. Lipophilic drugs have an advantage in crossing biological barriers and reaching their intended sites of action. However, lipophilic drugs often have a restricted capacity for renal expulsion or elimination from the body. When these drugs enter the kidneys and undergo glomerular...
Lipid-Lowering Drugs: Statins and Miscellaneous Agents01:20

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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...
Lipid Absorption01:24

Lipid Absorption

Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
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Bioavailability Enhancement: Drug Permeability Enhancement01:27

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After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...
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Modified-release drug delivery systems are designed to optimize the therapeutic effect of drugs by minimizing side effects, reducing the dosage required, and controlling drug release to align with pharmacokinetic and pharmacodynamic needs. The system depends on two key factors: the drug's release from the formulation and its movement through the body to the target site. Unlike conventional dosage forms, where absorption is the limiting step, the rate of drug release is the key determinant in...

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Differential Effects of Lipid-lowering Drugs in Modulating Morphology of Cholesterol Particles
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Development in lipid drugs.

J Raulin1

  • 1Université Denis Diderot (Paris 7), 2 place Jussieu, 75005 Paris, France. jeanine.raulin@wanadoo.fr

Mini Reviews in Medicinal Chemistry
|May 17, 2005
PubMed
Summary
This summary is machine-generated.

Lipopeptides and novel compounds show promise in vaccine development and gene therapy. Specific lipid esters demonstrate efficacy against orthopoxviruses, suggesting potential for human infection treatment.

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Area of Science:

  • Immunology
  • Virology
  • Gene Therapy

Background:

  • Lipopeptides are known to stimulate immune responses, with applications in vaccines against HIV-1 and melanoma.
  • Novel lipoplexes are being investigated for gene delivery into tumor nodules.
  • Glycyrrhizic acid exhibits antiviral properties against SARS-CoV.
  • Lipid ester derivatives of cidofovir show enhanced activity against vaccinia and cowpox viruses.

Purpose of the Study:

  • To explore the immunomodulatory and therapeutic potential of various lipopeptide and lipid-based compounds.
  • To evaluate the efficacy of novel lipoplexes in gene delivery for cancer therapy.
  • To assess the antiviral activity of glycyrrhizic acid and cidofovir derivatives.

Main Methods:

  • Investigating lipopeptide-mediated dendritic cell internalization and T-cell responses.
  • Utilizing lipoplexes for gene delivery into mouse pancreatic tumor models.
  • Assessing the in vitro and in vivo efficacy of antiviral compounds against orthopoxviruses.

Main Results:

  • Lipopeptides elicit immune responses and sustain HIV control.
  • Anti-melanoma lipopeptides induce strong cytolytic T lymphocyte responses.
  • Lipoplexes mediate gene delivery into tumor nodules.
  • Glycyrrhizic acid inhibits SARS-CoV replication.
  • CDV ether lipid esters show enhanced in vitro activity against VV and CV.
  • Oral CDV ether lipid esters are effective against VV and CV infections in mice.

Conclusions:

  • Lipopeptide-based strategies show potential for vaccine development and cancer immunotherapy.
  • Novel lipoplexes offer a promising avenue for targeted gene therapy.
  • Glycyrrhizic acid and cidofovir derivatives represent potential therapeutic agents against viral infections.
  • CDV ether lipid esters present a viable treatment option for orthopoxvirus infections.