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A Hydrophobic Tissue Clearing Method for Rat Brain Tissue
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Aqueous-based tissue clearing in crustaceans.

Alu Konno1, Shigetoshi Okazaki1

  • 1Department of Medical Spectroscopy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu-City, Shizuoka-Pref 431-3192 Japan.

Zoological Letters
|June 23, 2018
PubMed
Summary

We developed a new tissue clearing method for crustaceans, enabling detailed 3D visualization of internal organs in pigmented, calcified specimens. This technique advances zoological research on diverse arthropod morphology.

Keywords:
Advanced CUBICCrustaceaDecapodaIsopodaTissue clearing

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Area of Science:

  • Zoology
  • Histology
  • Biotechnology

Background:

  • Traditional tissue investigation methods like dissection cause spatial information loss.
  • Existing aqueous-based tissue clearing techniques are optimized for small rodents, not pigmented or calcified organisms.
  • Applicability of advanced tissue clearing to diverse non-model organisms remains largely untested.

Purpose of the Study:

  • To adapt and apply an aqueous-based tissue clearing technique to small crustaceans.
  • To overcome challenges posed by strong pigmentation and calcified exoskeletons in crustaceans for 3D histology.
  • To enable detailed morphological studies of crustaceans using whole-mount tissue clearing.

Main Methods:

  • Adapted the advanced CUBIC (Clear, Unobstructed Brain/Body Imaging) technique for crustaceans.
  • Introduced pretreatment steps including decalcification and bleaching for pigmented and calcified specimens.
  • Utilized fluorescent nuclear staining with propidium iodide (PI) for enhanced visualization.

Main Results:

  • Successfully cleared the terrestrial isopod, *Armadillidium vulgare*, making it transparent.
  • Internal organs, including the digestive and reproductive tracts, became visible in cleared isopods.
  • The method was also effective for the marine crab, *Philyra* sp.

Conclusions:

  • Developed the first aqueous-based whole-mount tissue clearing method for crustaceans.
  • The adapted technique significantly improves the clearing capacity for organisms with calcified exoskeletons and pigmentation.
  • This method offers a valuable tool for advancing morphological studies in crustaceans and similar organisms.