Sperm cryopreservation: A review on current molecular cryobiology and advanced approaches

Area of Science:

• Reproductive Biology
• Cryobiology
• Molecular Biology

Background:

• Sperm cryopreservation has been used for fertility preservation since the 1960s.
• The precise biological and biochemical mechanisms underlying cryopreservation-induced sperm damage remain unclear.
• Factors like temperature shock, ice formation, and osmotic stress are implicated in reduced sperm quality post-thaw.

Purpose of the Study:

• To review recent findings on molecular and cellular alterations in spermatozoa during cryopreservation.
• To consolidate current understanding of sperm cryobiology.
• To discuss advancements in sperm cryopreservation techniques and protective strategies, and assess potential trans-generational impacts.

Main Methods:

• Literature review of recent scientific reports.
• Analysis of molecular and cellular modifications during sperm cryopreservation.
• Evaluation of current and novel cryoprotective strategies.
• Assessment of potential effects on offspring health.

Main Results:

• Cryopreservation can induce molecular changes in spermatozoa, including epigenetic and proteomic modulation.
• The mechanisms of cryo-damage are complex, involving physical and chemical stressors.
• Novel strategies are emerging to mitigate cryo-damage and improve post-thaw sperm viability.
• The long-term and trans-generational effects of sperm cryopreservation require further investigation.

Conclusions:

• Further research is needed to fully elucidate the molecular mechanisms of sperm cryopreservation.
• Optimizing cryopreservation techniques and protective strategies is crucial for maintaining sperm quality.
• Understanding the potential impact of sperm cryopreservation on offspring health is essential for reproductive medicine.