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Collection, Isolation, and Flow Cytometric Analysis of Human Endocervical Samples
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Heterogeneous microstructural changes of the cervix influence cervical funneling.

A Ostadi Moghaddam1, Z Lin2, M Sivaguru3

  • 1Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA.

Acta Biomaterialia
|December 27, 2021
PubMed
Summary

Pregnancy causes non-uniform cervical remodeling, with collagen fibers reorienting in the inner zone. These microstructural changes impact cervical funneling, a risk factor for preterm birth (PTB).

Keywords:
Cervical funnelingCervical remodelingCollagen microstructurePreterm birth

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Area of Science:

  • Reproductive biology
  • Biomedical engineering
  • Biophysics

Background:

  • The cervix maintains pregnancy but abnormal remodeling can cause preterm birth (PTB).
  • Previous studies have not fully characterized the complex 3D microstructure of the cervix during pregnancy.
  • Understanding cervical microstructural changes is crucial for identifying PTB risk factors.

Purpose of the Study:

  • To investigate the 3D microstructural remodeling of the rat cervix during pregnancy.
  • To determine if cervical remodeling is uniform across different regions.
  • To explore the relationship between microstructural changes and cervical funneling, a marker for PTB risk.

Main Methods:

  • Quantitative 3D second-harmonic generation microscopy to image cervical microstructure.
  • Finite element simulation to model the mechanical impact of microstructural changes.
  • Analysis of collagen fiber orientation and regional tissue properties.

Main Results:

  • Cervical remodeling during pregnancy is heterogeneous, with collagen fibers reorienting perpendicularly to the canal in the inner cervical zone.
  • Initially distinct cervical regions become more similar in microstructure as pregnancy progresses.
  • Simulations show heterogeneous remodeling significantly influences cervical funneling, with the inner cervical zone's fiber orientation playing a key role.

Conclusions:

  • Cervical microstructural remodeling is region-specific and dynamic during pregnancy.
  • The orientation of collagen fibers in the inner cervical zone is critical for maintaining cervical integrity and preventing premature dilation.
  • These findings provide new insights into PTB mechanisms and support further clinical research on cervical funneling.