Click histochemistry for whole-mount staining of brain structures

Area of Science:

• Neuroscience
• Cell Biology
• Histochemistry

Background:

• Labeling replicating DNA with thymidine analogs marks dividing cells but is limited to histological sections.
• Current 3D tissue visualization methods necessitate detecting dividing cells within entire organs.

Purpose of the Study:

• To describe a novel method for labeling and detecting dividing cells in whole brain structures using 5-ethynyl-2'-deoxyuridine (EdU).
• To enable 3D visualization of cell proliferation and fate in neurogenesis studies within intact tissues.

Main Methods:

• Utilized 5-ethynyl-2'-deoxyuridine (EdU) for labeling DNA replication in dividing cells.
• Employed Copper(I)-catalyzed [3+2] cycloaddition (click reaction) for EdU detection in whole-mount tissues.
• Applied the method to whole brain structures, including the hippocampus, for 3D visualization.

Main Results:

• Developed a whole-mount click histochemistry technique for staining brain structures and other tissues.
• Successfully visualized dividing cells in 3D within whole brain preparations.
• Demonstrated high staining specificity, signal intensity, and low background in mouse brain tissue.

Conclusions:

• The new click histochemistry method facilitates whole-mount staining and 3D visualization of dividing cells.
• This technique is valuable for neurogenesis studies, including birthdating progenitors and tracking cell progeny.
• The method offers a robust approach for analyzing cell proliferation, survival, migration, differentiation, and fate in various tissues.