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Fluorescent nanoparticles for observing primo vascular system along sciatic nerve.

Zhao-Feng Jia1, Byung-Cheon Lee, Ki-Hoon Eom

  • 1Biomedical Physics Laboratory, Department of Physics and Astronomy, Seoul National University, 599 Gwanak, Gwanak-gu, Seoul, Korea.

Journal of Acupuncture and Meridian Studies
|September 28, 2010
PubMed
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Researchers discovered the primo vascular system within the rat sciatic nerve

Area of Science:

  • Anatomy
  • Microscopy
  • Nanotechnology

Background:

  • The primo vascular system, a network of fine vessels, is increasingly recognized in various tissues.
  • Its presence and characteristics along peripheral nerves require further elucidation.
  • Standard imaging techniques often struggle to visualize these delicate structures.

Purpose of the Study:

  • To investigate the presence and morphology of the primo vascular system in the epineurium of the rat sciatic nerve.
  • To evaluate the utility of fluorescent nanoparticles for in vivo imaging of this system.
  • To differentiate primo-vessels from other vascular and neural structures.

Main Methods:

  • Subcutaneous injection of fluorescent nanoparticles into the Zusanli acupoint (ST-36) in rats.

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  • Tracking nanoparticle flow along the sciatic nerve using fluorescence imaging.
  • Isolation and staining of nerve tissue with 4',6-diamidino-2-phenylindole (DAPI).
  • Confocal microscopy for high-resolution imaging of primo-vessel structures.

    • Main Results:

    • Fluorescent nanoparticles were observed within a previously poorly detectable structure in the epineurium of the sciatic nerve.
    • Primo-vessels exhibited a distinct nuclei distribution and multi-lumen morphology.
    • These features clearly differentiated primo-vessels from lymphatic vessels, blood capillaries, and nerve fibers.
    • Nanoparticle-based fluorescence imaging proved effective for in vivo visualization.

    Conclusions:

    • The study confirms the presence of the primo vascular system within the epineurium of the rat sciatic nerve.
    • Fluorescent nanoparticles offer a novel and effective tool for in vivo imaging of primo-vessels.
    • This technique enhances the ability to study the anatomy and function of the primo vascular system.