Siemen Jager

Bio: Siemen Jager is an academic researcher from University of Groningen. The author has contributed to research in topics: Sperm & Semen. The author has an hindex of 17, co-authored 33 publications receiving 1254 citations.

A simple method of screening for antisperm antibodies in the human male. Detection of spermatozoal surface IgG with the direct mixed antiglobulin reaction carried out on untreated fresh human semen.

Abstract: A simple and rapid test for the detection of antisperm antibodies of the IgG class on freely swimming spermatozoa in fresh human semen is described. The test is based on the formation of motile mixed agglutinates between erythrocytes sensitized with incomplete anti-Rh-antibodies and freely swimming spermatozoa with surface antisperm antibodies, after mixing both cell types together with anti-IgG antiserum. Agglutination of the red blood cells serves as an internal control. The test can be applied on ejaculates with spermatozoa concentrations down to one million per ml, provided the motility is sufficient. The percentage of motile spermatozoa found to be coated with antisperm antibodies of the IgG class, and the extent of the coating, proved to be correlated with the agglutination titer of circulating antisperm antibodies and with the inhibition of sperm penetration into cervical mucus. The test can be used as a screening for the presence of antisperm autoantibodies in serum and semen.

Immunoglobulin class of antispermatozoal antibodies from infertile men and inhibition of in vitro sperm penetration into cervical mucus.

Abstract: The presence of IgG and IgA on motile spermatozoa from normal semen donors and men from infertile couples was studied with mixed antiglobulin reaction (MAR) tests. The percentage of motile spermatozoa with IgG (IgG MAR%) was found to be related to the circulating antispermatozoal IgG. No direct relation could be detected between the IgG MAR% and the sperm agglutinating activity in seminal plasma (SP) or the percentage of motile spermatozoa showing the shaking phenomenon (S%) in the sperm cervical mucus contact (SCMC) test. The percentage of motile spermatozoa with IgA (IgA MAR%) showed no direct relation to the sperm agglutinating activity in serum and SP, but was roughly proportional with the S%. It was discerned that the shaking phenomenon in the SCMC test was probably due to presence of IgA on the motile spermatozoa. Previously it had been demonstrated that also the sperm agglutinating activity in SP is caused by IgA that is probably locally produced in the male genital tract. In conclusion it was thought that the reduced ability of penetration into cervical mucus by spermatozoa from infertile men is caused by locally produced IgA.

The treatment of ejaculation disorders after retroperitoneal lymph node dissection.

Abstract: In 14 patients by bilateral retroperitoneal lymph node dissection for nonseminoma tumors of the testes, several sexual functions before and after node dissection were compared. All patients had normal sexual function before the operation. After the operation, antegrade ejaculation was found to have disappeared completely in 12 patients, retrograde ejaculation was demonstrable in ten of these patients. In ten patients, antegrade ejaculation was restored after treatment with 25 mg imipramine twice daily by mouth. In the two patients who still showed antegrade ejaculation, albeit diminished, imipramine medication led to an increased number of spermatoza. During imipramine medication, the partners of five patients became pregnant. The preliminary conclusion from these findings is that ejaculation disorders, which most males develop after bilateral retroperitoneal lymph node dissection, can be successfully treated with daily oral doses of 25-50 mg imipramine in the majority of patients who still desire children.