Plexin-B1, glycodelin and MMP7 expression in the human fallopian tube and in the endometrium

Abstract

Background: To study the expression of Plexin-B1, Glycodelin, and MMP7 during the menstrual cycle in the endometrium and in the fallopian tube.

Methods: The research included women undergoing hysterectomy, tubal sterilization or salpingo-oophoerectomy. Total RNA from endometrial and fallopian tube tissues was extracted using a total RNA isolation kit. Semi-quantitative RT-PCR was performed to examine mRNA relative expression.

Results: Plexin-B1 expression in the endometrium was significantly higher on days 19 - 23 compared to days 12 - 14 (1.166 +/- 0.42 versus 0.523 +/- 0.299), P < 0.005. In the fallopian tube the level of plexin-B1 did not change significantly throughout the menstrual cycle. Glycodelin expression was significantly higher on days 19 - 23 compared with days 12-14, both in the endometrium (0.819 +/- 0.564 versus 0.072 +/- 0.343, P < 0.05) and the fallopian tube (0.796 +/- 0.196 versus 0.329 +/- 0.398, P < 0.05). Although the level of MMP7 secretion was the highest in the secretory phase the difference from the proliferative phase did not reach statistical significance, neither in the endometrium nor in the fallopian tube. This could result from a lack of power.

Conclusions: In the endometrium, both Glycodelin and Plexin-B1 are exhibiting a cyclic pattern suggesting a possible steroid regulation and a role in endometrial receptivity.

Figure 1

Glycodelin expression in primary endometrial versus fallopian tube biopsies. Line-graph representing mean ± SEM of total Glycodelin to GAPDH ratio from 22 endometrial and 22 fallopian tube biopsies, taken from different menstrual cycle days. Blue line-graph represents primary endometrial biopsies, Pink line-graph represents fallopian tube biopsies, * = P < 0.05 in both tissues between days 19-23 compared to days12-14.

Figure 2

MMP7 expression in primary endometrial versus fallopian tube biopsies. Line-graph representing mean ± SEM of total MMP7 to GAPDH ratio from 22 endometrial and 22 fallopian tube biopsies, taken from different menstrual cycle days. Blue line-graph represents primary endometrial biopsies, Pink line-graph represents fallopian tube biopsies.

Figure 3

Plexin B1 expression in primary endometrial versus fallopian tube biopsies. Line-graph representing mean ± SEM of total Plexin B1 to GAPDH ratio from 22 endometrial and 22 fallopian tube biopsies, taken from different menstrual cycle days. Blue line-graph represents primary endometrial biopsies, Pink line-graph represents fallopian tube biopsies, * = P < 0.05 in the endometrium between days 19-23 compared to days12-14.