| Summary: | The aim of this study was to compare thepercentages of sperm with an acrosome reaction between those with and without calcium ionophore A23187 induction after two-layer Percoll gradient separation. Thirty normal semen samples were obtained from the male partners of infertile couples attending the Infertility Clinic at Siriraj Hospital. After the process of sperm separation by two-layer Percoll gradient technique, the final samples samples were divided into 2 portions. An aliquot of 10 μM of calcium ionophore A23187 was added to one portion to induce an acrosome reaction, while the other portion was used as a control. Fluorescein isothiocyanate-conjugated Pisum sativam agglutinin (FITC-PSA) staining was performed on both specimens and the acrosome reated-sperm were evaluated. The percentage of acrosome-reated sperm in the calcium ionophore A23187 induced group was significantly higher than those of the control group (24.8 ± 6.6 vs 15.4 ± 6.0 ; p < 0.001). It is concluded that calcium ionophore can significantly induce an acrosome reaction on sperm separated by two-layer Percoll gradient technique, and it may be beneficial to add calcium ionophore A23187 to sperm preparation for use in IUI or IVF.
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