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Archimedes' principle is fundamental in analyzing the buoyant force and stability of floating bodies. In this example, a wooden block with a rectangular section floats in seawater. Based on the block's dimensions, its specific gravity and the specific weight of seawater are used to find the volume of water displaced and the center of buoyancy.
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Custom-made Microdialysis Probe Design
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Design Principles for Cationic, Astrocyte-Targeted Probes.

Alyssa N Preston1, Joshua D Farr2, Kevin C Tan1

  • 1Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, NY, 11794, USA.

Chembiochem : a European Journal of Chemical Biology
|November 13, 2018
PubMed
Summary
This summary is machine-generated.

Researchers modified a fluorescent marker to better target brain astrocytes. A positive charge and specific chemical structure were found crucial for accurate astrocyte labeling, enabling new molecular tools.

Keywords:
astrocytescationic fluorophoresfluorescent probesglia imagingneuroimaging

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Astrocytes are crucial brain cells involved in both normal function and disease.
  • Targeting specific brain cell types like astrocytes with small molecules is essential for research and therapeutic development.
  • Developing precise astrocyte-targeting tools requires understanding the chemical properties that drive cell-specific interactions.

Purpose of the Study:

  • To investigate how synthetic modifications to an astrocyte-targeting moiety affect its specificity and efficiency.
  • To determine the optimal physicochemical properties (hydrophobicity, charge, pKa) for robust astrocyte labeling.
  • To establish a foundation for creating advanced astrocyte-targeted molecular tools.

Main Methods:

  • Synthetically modified a rhodamine-based fluorescent marker with varying astrocyte-targeting moieties.
  • Tested the targeting capabilities of modified markers on isolated mouse cortical astrocytes and neurons.
  • Analyzed the impact of hydrophobicity, charge, and pKa of the targeting moiety on astrocyte labeling.

Main Results:

  • Identified that a specific molecular charge of +2 is critical for effective astrocyte targeting.
  • Determined that a targeting moiety containing a heterocyclic aromatic amine is essential for specific and strong astrocyte labeling.
  • Demonstrated that these modifications significantly improve the selectivity of the marker for astrocytes over neurons.

Conclusions:

  • Specific physicochemical properties, particularly overall molecular charge and the nature of the targeting moiety, are key determinants for astrocyte-specific labeling.
  • The findings provide a rational design strategy for engineering novel astrocyte-targeted molecular probes.
  • These improved tools hold potential for applications such as metabolite sensing and optogenetic manipulation of astrocytes.