Molecular Human Reproduction, Vol. 5, No. 2, 109-115,
February 1999
© 1999 European Society of Human Reproduction and Embryology
Binding of annexin V to plasma membranes of human spermatozoa: a rapid assay for detection of membrane changes after cryostorage
1 Department of Dermatology/Andrology Unit, University of Leipzig, Liebigstrasse 21, D-04103 Leipzig, and 2 Department of Dermatology, St. Barbara Hospital, Duisburg, Germany
When the cell membrane is disturbed, phospholipid phosphatidylserine (PS) is translocated from the inner to the outer leaflet of the plasma membrane. This is one of the earliest signs of apoptosis and can be monitored by the calcium-dependent binding of annexin V. Therefore, annexin V-binding, in conjunction with flow cytometry, was used to evaluate the integrity of the sperm plasma membrane after different cryostorage protocols: i.e. 10% (v/v) glycerol; sperm maintenance medium (MM); freezing medium TEST yolk buffer (TYB); or cryostorage without protection (cryoshock). Using a combination of two fluorescent dyes, annexin V and propidium iodide (PI), led to three groups of spermatozoa being identified: (i) viable spermatozoa (annexin V-negative and PI-negative); (ii) dead spermatozoa (annexin V-positive and PI-positive); and (iii) cells with impaired but integer plasma membrane (annexin V-positive and PI-negative). The percentage of vital annexin V-negative spermatozoa increased significantly (P < 0.05) from spermatozoa treated by cryoshock (15.0 ± 1.2%) to spermatozoa cryopreserved by TYB (26.6 ± 2.2%) via cryopreservation by 10% (v/v) glycerol (19.9 ± 1.6%) and by MM (22.2 1.8%) and was associated with the percentage of motile spermatozoa (17.6 ± 3.4% by glycerol; 19.6 ± 3.7% by MM and 22.6 ± 3.9% by TYB; P = 0.0001). Of the spermatozoa, 12–22% were annexin V-positive even though they did not bind to PI, indicating viability before as well as after cryostorage. The percentage of vital annexin V-positive spermatozoa was significantly correlated with different sperm motility parameters (velocity straight linear, r = 0.601, P = 0.018; percentage of linearly motile spermatozoa: r = 0.549, P = 0.034). We, therefore, concluded that annexin V-binding is more sensitive in detecting a deterioration of membrane functions than PI staining, and that a considerable percentage of spermatozoa might have dysfunctional plasma membranes besides dead or moribund cells. Of the cryopreservation protocols tested, TYB yielded the most viable spermatozoa. Therefore, we advocate the use of the annexin V-binding assay for the evaluation of the quality and integrity of spermatozoa.
annexin V-binding/apoptosis/cryopreservation/human spermatozoa/plasma membrane
3 To whom correspondence should be addressed
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