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Related Experiment Video

Updated: Apr 17, 2026

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives
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High temperature is essential for preserved human sperm function during the devitrification process.

M A Mansilla1, O Merino1, J Risopatrón1,2

  • 1Center for Reproductive Biotechnology (CEBIOR-BIOREN), Faculty of Medicine, La Frontera University, Temuco, Chile.

Andrologia
|February 4, 2015
PubMed
Summary

Optimal warming of vitrified human spermatozoa at 42°C for 5-10 seconds significantly enhances sperm motility and plasma membrane function, crucial for maintaining fertilization potential after cryopreservation.

Keywords:
CryobiologyHOS testhuman spermatozoasperm functionsperm vitrification

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Area of Science:

  • Reproductive biology
  • Cryobiology
  • Human fertility preservation

Background:

  • Sperm vitrification offers rapid cryopreservation by direct immersion in liquid nitrogen (N2L), bypassing traditional slow cooling methods.
  • Maintaining sperm viability and function post-thaw is critical for successful assisted reproductive technologies.

Purpose of the Study:

  • To determine the optimal warming temperature for vitrified human spermatozoa.
  • To assess the impact of different warming temperatures on sperm motility and plasma membrane integrity.

Main Methods:

  • Human spermatozoa were vitrified via direct plunging into liquid nitrogen (N2L).
  • Vitrified sperm were warmed for 5 and 10 seconds at 38°C, 40°C, and 42°C.
  • Sperm motility was assessed using the CASA system, and plasma membrane function was evaluated by the HOST test.

Main Results:

  • Progressive sperm motility significantly increased with warming temperature, reaching 65.4 ± 15% at 42°C (P < 0.05 compared to 38°C).
  • Plasma membrane function, assessed by HOST test, was best preserved at 42°C (76.3 ± 2.0%).
  • Warming temperature critically affects sperm motility, plasma membrane integrity, and function.

Conclusions:

  • Warming vitrified human spermatozoa at 42°C is optimal for preserving key physiological parameters.
  • This warming protocol enhances sperm motility and plasma membrane integrity, supporting fertilization potential.