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Membrane Lipids01:32

Membrane Lipids

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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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Lipids function as structural components of cellular membranes, in addition to acting as energy reservoirs and signaling molecules. They are thus crucial to all living organisms.  The three biologically important classes of lipids are triglycerides, phospholipids, and steroids.
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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Multistep Interactions between Ibuprofen and Lipid Membranes.

Simou Sun1, Anne M Sendecki1, Saranya Pullanchery1

  • 1Department of Chemistry , Penn State University , University Park , State College , Pennsylvania 16802 , United States.

Langmuir : the ACS Journal of Surfaces and Colloids
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Ibuprofen interacts with lipid membranes in three concentration-dependent steps, from electrostatic adsorption to membrane solubilization. Lipid headgroup chemistry and acyl chain packing significantly influence these ibuprofen-membrane interactions.

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Area of Science:

  • Biochemistry
  • Materials Science

Background:

  • Phosphatidylcholine membranes are crucial biological structures.
  • Ibuprofen is a widely used nonsteroidal anti-inflammatory drug.

Purpose of the Study:

  • To elucidate the concentration-dependent interaction mechanism of ibuprofen with phosphatidylcholine membranes.
  • To investigate how lipid headgroup chemistry and acyl chain packing affect these interactions.

Main Methods:

  • Fluorescence binding assays
  • Vibrational sum frequency spectroscopy
  • Langmuir monolayer compression experiments

Main Results:

  • Ibuprofen interacts in three distinct steps: electrostatic adsorption, hydrophobic insertion, and membrane solubilization.
  • Lipid headgroup chemistry and acyl chain packing modulate ibuprofen binding.
  • Membrane composition alters specific steps in the ibuprofen-membrane interaction.

Conclusions:

  • Ibuprofen's interaction with membranes is a multi-step process influenced by drug concentration.
  • Membrane properties play a critical role in dictating the nature and extent of ibuprofen interaction.