Noninvasive and quantitative assessment of in vivo fetomaternal interface angiogenesis using RGD-based fluorescence.

Area of Science:

• Reproductive biology
• Medical imaging
• Biochemistry

Background:

• Angiogenesis is crucial for placental development and successful pregnancy.
• Existing in vitro methods for assessing angiogenesis are limited, with few reliable in vivo options available throughout gestation.

Purpose of the Study:

• To develop and validate a novel in vivo technique for specifically measuring placental neovascularization.
• To establish a quantitative and noninvasive method for assessing angiogenic activity during pregnancy.

Main Methods:

• Utilized a fluorescent alpha v beta 3 (αvβ3) integrin-targeting molecule, Angiolone-Alexa-Fluor 700, for in vivo imaging.
• Administered Angiolone to gravid mice at specific gestational points (6.5 and 11.5 days post coitus) and analyzed fluorescence one day later.
• Correlated fluorescence measurements with placental size and gestational age.

Main Results:

• Demonstrated high specificity of Angiolone for targeting αvβ3 protein in the placenta.
• Validated the technique as quantitative, showing a correlation between fluorescence intensity and increasing placental size with gestational age.
• Showcased the potential for early detection of abnormal placentation and assessment of pregnancy outcome.

Conclusions:

• Successfully validated a new noninvasive, quantitative in vivo method for assessing placental angiogenic activity.
• The Angiolone-Alexa-Fluor 700 technique provides a reliable tool for monitoring placental development and health throughout gestation.
• This method facilitates early identification of potential pregnancy complications related to placental function.