Fixation of testicular tissue for immunohistochemical and ultrastructural examination

Area of Science:

• Reproductive biology
• Histopathology
• Immunohistochemistry

Background:

• Glutardialdehyde fixation often compromises antigenicity, hindering combined morphological and immunohistochemical studies of testicular tissue.
• Preserving both structural integrity and epitope antigenicity is crucial for accurate testicular diagnostics.

Purpose of the Study:

• To develop and evaluate a novel fixation method for testicular tissue that preserves both morphology and antigenicity.
• To enable simultaneous light microscopy, electron microscopy, and immunohistochemical staining of human testicular biopsies.

Main Methods:

• A mixed fixative solution containing 3.7% formalin, 0.2% glutardialdehyde, and 0.05% saponin in phosphate buffer (pH 7.4) was formulated.
• Human testicular tissues were fixed, embedded in Epon 812 or paraffin, and subjected to light microscopy, electron microscopy, and immunohistochemical staining.
• Immunohistochemistry focused on the lamina propria, examining vimentin and desmin immunoreactivity in peritubular cells.

Main Results:

• The novel fixative demonstrated excellent preservation of testicular tissue structure at both light and electron microscopic levels.
• Cytological details were well-maintained, facilitating the recognition of individual tumor cells.
• Immunohistochemical analysis confirmed retained antigenicity, evidenced by strong vimentin and desmin immunoreactivity in peritubular cells.

Conclusions:

• The developed fixation technique successfully preserves testicular tissue morphology and antigenicity, outperforming standard glutardialdehyde fixation for combined analyses.
• This method supports detailed cytological examination and reliable immunohistochemical assessment of testicular biopsies.
• The findings offer improved diagnostic potential for various testicular pathologies.