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Improvement of post-thaw sperm motility in poor quality human semen.

Abstract：

OBJECTIVE:To find alternative cryopreservation methods to improve the post-thaw fertilizing capacity of poor quality human sperm. DESIGN:Controlled clinical study. SETTING:Fertility clinic of a teaching hospital. PATIENTS:Men with poor quality semen samples, i.e., asthenozoospermia (< 40% motile sperm) and/or oligozoospermia (< 20 x 10(6) sperm/mL). Fertile sperm donors were used for comparison. INTERVENTIONS:Semen samples were divided into four aliquots and slowly diluted 1:1 with: [1] n-tris (hydroxymethyl) methyl-2-amino ethane sulfonic acid (TES) and tris (hydroxymethyl) aminomethane (Tris)-citric acid-egg yolk buffer with 12% glycerol (TEST), [2] TEST+CryoSeeds (Cell Systems, Ltd., Cambridge, UK), [3] TEST + 10 mM dithiothreitol (DTT), or [4] TEST+CryoSeeds + 10 mM DTT. Cryovials were frozen using slow staged cooling and static vapor freeze and stored at -196 degrees C. MAIN OUTCOME MEASURE:The frozen aliquots were randomly thawed and, after 15 minutes at 37 degrees C, motion analysis was performed. RESULTS:The percent motility after freeze-thaw in TEST was significantly decreased to 42 +/- 5% of prefreeze motility (P < 0.001). Addition of CryoSeeds with holding at -5 degrees C for 10 minutes resulted in 47 +/- 6% of prefreeze motility, which was not different than TEST alone. Addition of DTT to TEST significantly improved post-thaw motility over TEST alone to 71 +/- 7% of initial motility (P < 0.01). The combination of CryoSeeds and DTT further improved post-thaw motility to 80 +/- 10% of initial motility, which was not different than the neat semen. CONCLUSION:The present results suggest that DTT, a reducing agent that prevents oxidation of sulfhydryl groups, protects poor quality spermatozoa from excessive cryodamage. Thus, DTT along with seeding may be a useful addition when long-term storage of poor quality semen is crucial for maintaining reproductive potential.

journal_name

Fertil Steril

journal_title

Fertility and sterility

authors

Sawetawan C,Bruns ES,Prins GS

doi

10.1016/s0015-0282(16)56227-x

subject

Has Abstract

pub_date

1993-10-01 00:00:00

pages

706-10

issue

eissn

0015-0282

issn

1556-5653

pii

S0015-0282(16)56227-X

journal_volume

pub_type

临床试验,杂志文章

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Improvement of post-thaw sperm motility in poor quality human semen.