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Assessment of Maternal Vascular Remodeling During Pregnancy in the Mouse Uterus
Published on: December 5, 2015
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Material properties of mouse cervical tissue in normal gestation
Kyoko Yoshida1, Mala Mahendroo2, Joy Vink3
1Department of Mechanical Engineering, Columbia University, New York, NY, USA.
Acta Biomaterialia
|March 11, 2016
Summary
Researchers quantified cervical material property changes in pregnant mice using a novel porous fiber composite model. The cervix softens significantly between days 6 and 12 of gestation, providing insights into pregnancy and delivery.
Area of Science:
- Biomedical Engineering
- Reproductive Biology
- Materials Science
Background:
- Cervical remodeling is crucial for healthy delivery, but human tissue accessibility limits understanding of its material property changes during pregnancy.
- Rodent models offer a viable alternative for studying gestation-timed cervical tissue due to sample availability and genetic manipulation possibilities.
- Characterizing mouse cervix material properties is challenging due to its small size and intricate geometry.
Purpose of the Study:
- To quantify cervical material property changes throughout normal mouse pregnancy.
- To develop and validate a microstructurally-inspired porous fiber composite model for mouse cervix biomechanics.
- To establish a combined experimental and computational framework for analyzing cervical tissue remodeling.
Main Methods:
- Mechanically testing intact, whole mouse cervix samples under tension via sutures inserted through the cervical canal.
- Employing inverse finite element analysis to interpret mechanical test results under combined loading conditions.
- Fitting a porous fiber composite material model to experimental load-deformation and osmotic swelling data, validated with independent deformation data.
Main Results:
- The porous fiber composite model accurately captures the large deformation mechanical behavior of the mouse cervix.
- Cervical softening initiates between gestation day 6 and day 12 in a 19-day gestation period.
- Key material parameters, including collagen fiber and ground substance stiffness, decrease substantially from early to late gestation.
Conclusions:
- The study successfully quantifies cervical material property changes during normal mouse pregnancy.
- The developed model provides a robust method for analyzing the biomechanics of small, geometrically complex biological tissues.
- Findings reveal a critical window of cervical softening during mid-pregnancy, offering potential insights into parturition mechanisms.
