PubMed Health⌕ Search

Biomedical subjects

L Nebel

Publications and source records attributed to L Nebel.

95 records · Page 6Linked to original sources
PubMedDate not supplied

Human embryo chromosomes: preliminary results of a study to karyotype multipronuclear human oocytes fertilized in vitro.

Using special techniques the authors have analyzed the chromosome constitution of human gametes participating in fertilization in vitro. Only oocytes with multiple pronuclei have been used in this study. Two conclusions are reached by the Authors: first, that the gametes involved in the production of oocytes with multiple pronuclei can be chromosomally abnormal, specifically aneuploid and that not all oocytes with three pronuclei will cleave to form triploid embryos. The Authors underline that even normal, normospermically fertilized oocytes could have a chromosomal abnormality. They conclude that embryos with chromosomal abnormalities may be produced by IVF and ET and that their existence is reflected by the inability of the vast majority of transferred embryos to survive to term delivery.

Cell Nucleus↗
PubMedDate not supplied

[Leukocyte reactions "in vitro" to human spermatozoa in infertile females].

Leucocyte migration test was done in 55 couples facing fertility problems for detection of antispermatozoal cellular hypersensitivity. In 29 cases out of 55, the sterility was unexplained and in 26 cases out of 55, various infertility factors were found. In this study, wife's leucocytes separated on Ficoll-Urografin gradient were incubated (4.10(6) per capillary) with washed fresh husband's spermatozoa suspended at 7.10(6)/ml in M 199 and 20 p. 100 fetal bovine serum. The results were read after 18h. Two kinds of migration inhibition were found: 1) Specific wives leucocyte migration inhibition in 4 out of 55 cases, all of them unexplained infertility cases. 2) Leucocyte migration inhibition not related to wife's immunity state and possibly due to a direct effect of a toxic or inhibitory property of some husband's spermatozoa in 22 out of 55 cases, 11/19 cases with known male factors, and 11/36 cases without any male factor. In the follow up, only 1 woman out of the 22 couples with husband's spermatozoal inhibitory factor was pregnant later, while in the group of 29 women in which normal leucocyte spreading was found, 8 women conceived later. No woman out of the 4 suspected of antispermatozoal delayed hypersensitivity have conceived. Attention must be paid to the possible role of delayed hypersensitivity to sperm in unexplained infertility and also to the occurrence of spermatozoal toxic factor and its possible implications on human infertility.

Adult↗