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Nucleons II: cryopreservation and metabolic activity.
R Reyes1, J C Flores-Alonso, H M Rodríguez-Hernández
1Biology of Reproduction Division, Mexican Institute of Social Security, Puebla.
Archives of Andrology
|July 10, 2001
Summary
Selecting viable sperm for intracytoplasmic sperm injection (ICSI) is challenging. This study introduces a metabolic test using fluorescein diacetate (FDA) to identify live sperm after cryopreservation, improving fertilization and pregnancy rates.
Area of Science:
- Assisted reproductive technology
- Spermatozoa cryopreservation
- Cellular metabolism
Background:
- Intracytoplasmic sperm injection (ICSI) is a key treatment for male infertility.
- A major challenge in ICSI is distinguishing live from dead immotile sperm.
- Cryopreservation significantly reduces sperm viability.
Purpose of the Study:
- To identify a reliable metabolic test for assessing sperm viability after cryopreservation.
- To enable the selection of metabolically active sperm for ICSI.
- To improve fertilization and pregnancy rates in assisted reproduction.
Main Methods:
- Cryopreservation of sperm nucleons at 5°C and -5°C.
- Analysis of sperm morphology using Metamorph Imaging System software.
- Assessment of sperm viability using fluorescein diacetate (FDA) staining and fluorescence microscopy.
Main Results:
- Fluorescein diacetate (FDA) hydrolysis indicates metabolic activity in sperm.
- Metabolic activity, detected by FDA, allows for the selection of viable sperm.
- Cryopreserved sperm, selected via FDA, demonstrated suitable fertilization and pregnancy rates after months.
Conclusions:
- FDA staining is a viable method for assessing sperm viability post-cryopreservation.
- This metabolic test facilitates the selection of live sperm for ICSI.
- The technique offers a simple approach to improve ICSI outcomes with cryopreserved sperm.