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3D imaging of biological specimen using MS.

John S Fletcher1

  • 1Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg Sweden.

Bioanalysis
|October 30, 2015
PubMed
Summary

Imaging mass spectrometry (MS) offers unique insights into compound distribution in biological samples. Advanced techniques like MALDI MS and secondary ion MS enable high-resolution 3D molecular imaging for drug distribution and action studies.

Area of Science:

  • Biomedical imaging
  • Analytical chemistry
  • Molecular imaging

Background:

  • Imaging mass spectrometry (MS) provides spatial distribution data for native and non-native compounds in biological specimens.
  • Matrix-assisted laser desorption/ionization MS (MALDI MS) and secondary ion MS are key techniques offering complementary molecular and elemental information.
  • Existing methods allow for 2D and 3D molecular imaging, from whole organs to single cells.

Purpose of the Study:

  • To highlight the capabilities of imaging MS for analyzing compound distribution in biological samples.
  • To discuss the complementary nature of MALDI MS and secondary ion MS.
  • To explore the potential of 3D imaging MS for high-precision drug distribution and action studies.

Main Methods:

  • Utilizing Matrix-assisted laser desorption/ionization MS (MALDI MS) for high mass species.

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  • Employing secondary ion MS for high spatial resolution and elemental signals.
  • Developing and applying 3D imaging MS approaches for enhanced z-dimension resolution.

    • Main Results:

    • MALDI MS excels at detecting high mass species like proteins.
    • Secondary ion MS provides high spatial resolution for low mass species and elemental signals.
    • 3D imaging MS achieves higher resolution in the z-dimension compared to x and y, enabling detailed molecular localization.

    Conclusions:

    • Imaging MS techniques, particularly MALDI MS and secondary ion MS, offer powerful, complementary approaches for molecular distribution analysis.
    • 3D imaging MS significantly enhances precision in visualizing molecular distribution, with potential applications in drug action studies at the organelle level.