Microscopical advances in assisted reproduction.

Area of Science:

• Reproductive Biology
• Microscopy Techniques
• Assisted Reproduction

Background:

• Sperm quality is crucial for assisted reproduction success.
• Light microscopy for intracytoplasmic sperm injection (ICSI) selection misses vital ultrastructural details.
• Current methods rely heavily on sperm motility, overlooking other critical factors.

Purpose of the Study:

• To integrate polarization microscopy into the ICSI technique.
• To evaluate the birefringence of sperm organelles for enhanced analysis.
• To improve the selection of optimal spermatozoa for ICSI by providing more detailed information.

Main Methods:

• Implementation of polarizing and analyzing lenses in an inverted microscope.
• Use of compensators to evaluate birefringence retardation in sperm organelles.
• Real-time video capture and computer storage of images for analysis.
• Maintaining sperm viability and motility during polarization microscopy examination.

Main Results:

• Spermatozoa remained viable and motile under polarization microscopy.
• Birefringence patterns observed were consistent with fixed and sectioned biological samples.
• Polarization microscopy provided sperm analysis data closer to Transmission Electron Microscopy (TEM) than phase contrast microscopy.

Conclusions:

• Polarization microscopy offers a valuable tool for detailed sperm analysis in assisted reproduction.
• This technique enhances the selection of spermatozoa for ICSI by revealing ultrastructural characteristics.
• It bridges the gap between light microscopy and electron microscopy for sperm evaluation.