Evaluation of human sperm acrosome reaction and viability by flow cytometry.
We report in this work a quantitative procedure developed to evaluate the acrosomal reaction and vitality of human spermatozoa, with three color staining simultaneously. Twenty normal human sperm were labeled with GB24 monoclonal antibody, a fluorescein isothiocyanate conjugated lectin and propidium iodide (supravital stain). Four conjugated lectins were investigated: WGA, Con-A, PNA and UEA-1. Acrosome reaction was induced with calcium ionophore A-23187. Analyses were made by flow cytometry and electron microscopy. A high percentage of spermatozoa that stained with propidium iodide was found. The results of four lectins show an interaction between GB24 and lectin binding. Significant differences of fluorescence index were obtained between the samples with calcium ionophore A-23187 and the samples without it. The WGA-GB24 association shows an independent behavior and this may depend on the fact that WGA binds to the cytoplasmic membrane of human spermatozoa and GB24 antibody bind inner acrosome membrane. Using Con-A, PNA and UEA-I a crowded staining is likely to occur because these lectins and GB24 antibody mainly bind to acrosome membranes, and our results then show a close relation.
Fierro
R
R
Depto. Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, México, DF, México. reyna@xanum.uam.mx
Bene
M C
MC
Foliguet
B
B
Faure
G C
GC
Grignon
G
G
D020101:Acrosome Reaction / Q000187:drug effects / Q000502:physiology*; D001665:Binding Sites; D000001:Calcimycin / Q000494:pharmacology; D002470:Cell Survival / Q000502:physiology; D003208:Concanavalin A / Q000378:metabolism; D005434:Flow Cytometry / Q000379:methods*; D006801:Humans; D007476:Ionophores / Q000494:pharmacology; D037102:Lectins / Q000378:metabolism*; D008297:Male; D008854:Microscopy, Electron; D019887:Peanut Agglutinin / Q000378:metabolism; D037121:Plant Lectins; D013094:Spermatozoa / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D014909:Wheat Germ Agglutinins / Q000378:metabolism
D007476:Ionophores; D037102:Lectins; D019887:Peanut Agglutinin; D037121:Plant Lectins; C036850:Ulex europaeus lectins; D014909:Wheat Germ Agglutinins; D003208:Concanavalin A; D000001:Calcimycin