The effect of progesterone on the accumulation of leukocytes in the human endometrium.

OBJECTIVE

Our purpose was to determine the role of progesterone on the number and type of leukocytes found in human endometrium.

STUDY

DESIGN

Endometrial tissue was obtained from normally cycling women and from women receiving hormone replacement therapy for premature ovarian failure. All tissues were formalin fixed, sectioned, and stained with specific antibodies to leukocytes, T cells, B cells, and macrophages. Each tissue was also dated by means of published techniques. Quantitation was performed by counting all immunopositive cells in five high-powered fields. Data were compared by analysis of variance and Mann-Whitney U test.

RESULTS

Leukocytes increased from 31.1 to 99.1 per high-powered field (p = 0.0001), and T cells increased from 10.9 to 20.4 per high-powered field (p = 0.001) after 12 days of progesterone treatment of women with ovarian failure. Normally menstruating women in the late luteal phase had similar concentrations. Neither B cells nor macrophages were found to increase with progesterone treatment.

CONCLUSIONS

These data indicate that progesterone results in an increased leukocyte and T-cell concentration in human endometrium.