Alginate Effects on Human Sperm Parameters during Freezing and Thawing: A Prospective Study

Area of Science:

• Reproductive Biology
• Biomaterials Science
• Cryobiology

Background:

• Cryopreservation of human sperm is crucial for assisted reproductive technologies.
• Standard cryopreservation methods can lead to decreased sperm quality and function.
• Novel protective agents are needed to enhance sperm survival post-thaw.

Purpose of the Study:

• To investigate the protective effects of alginate on human sperm parameters during cryopreservation.
• To evaluate alginate's impact on sperm motility, morphology, viability, acrosome reaction, and DNA integrity after rapid freezing and thawing.

Main Methods:

• A prospective study involving 25 normozoospermic sperm samples.
• Samples were divided into two groups: 1% alginate encapsulation and a control group.
• Rapid freezing and thawing protocols were applied, followed by assessment of key sperm parameters.

Main Results:

• While sperm motility decreased in the alginate group post-thaw, viability and morphology remained comparable to the control.
• Alginate significantly preserved intact acrosome rates compared to the control group (55.25% vs. 45.12%).
• Significantly higher native DNA integrity was observed in the alginate group post-thaw (68.12% vs. 52.2%).

Conclusions:

• Alginate encapsulation appears to protect human sperm from DNA denaturation during cryopreservation.
• Alginate may prevent premature acrosome reactions, preserving sperm function post-thaw.
• This suggests alginate is a promising biomaterial for improving sperm cryopreservation protocols.