Abstract
To investigate the ability of steroid hormones to interact with endometrium, particularly in cases of unexplained subfertility, intact cells were incubated with tritiated progesterone and oestradiol and their uptake into the nuclei was measured. Samples were taken at dilatation and curettage from 23 fertile women, 14 women with unexplained primary subfertility, and 9 patients whose primary subfertility could be explained. Serum oestradiol and progesterone levels were not significantly different between the three groups, nor were values of 3H-oestradiol uptake. However, low (below 5 pmol/mg DNA) values for nuclear 3H-progesterone uptake were present in most samples from women with unexplained subfertility but in only about half of the women in the other two groups. This biochemical defect may be the cause of some cases of unexplained subfertility.
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