AlphaVBeta3 Integrin expression within uterine endometrium in unexplained infertility: a prospective cohort study

Area of Science:

• Reproductive biology
• Infertility research
• Integrin signaling

Background:

• Implantation defects contribute to unexplained infertility.
• Integrin expression, particularly Alpha v Beta 3 (αVβ3) integrin, increases during the mid-luteal phase, marking the window of implantation.
• αVβ3 integrin may act as a receptor for embryonic attachment.

Purpose of the Study:

• To investigate differences in endometrial αVβ3 integrin expression between women with unexplained infertility and fertile women.
• To determine if αVβ3 integrin can serve as a marker for the window of implantation in unexplained infertility.

Main Methods:

• Comparative study involving two groups: unexplained infertility and fertile controls.
• Endometrial thickness and subendometrial blood flow Resistance Index (RI) measured via transvaginal ultrasound (TVS).
• Immunohistochemistry (IHC) used to quantify endometrial αVβ3 integrin expression from endometrial samples.

Main Results:

• Women with unexplained infertility exhibited significantly lower endometrial αVβ3 integrin scores compared to fertile controls (P < 0.0001).
• The unexplained infertility group showed significantly higher subendometrial flow RI.
• Endometrial thickness was significantly thinner in the unexplained infertility group.

Conclusions:

• Significantly lower endometrial αVβ3 integrin in unexplained infertility suggests a link to defective uterine receptivity.
• Underexpression of αVβ3 integrin may be an unrecognized cause of infertility.
• Larger studies are needed to confirm clinical utility and investigate multiple cycles.