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Updated: Jun 23, 2025
Development of a Uterosacral Ligament Suspension Rat Model
Published on: August 17, 2022
Inflammatory Cells in Control and Prolapsed Uterosacral Ligament Tissue
David J Orlicky1, E Erin Smith2, Joshua Johnson3
1Department of Pathology, University of Colorado School of Medicine, Aurora, CO, USA. david.orlicky@cuanschutz.edu.
Insights
Pelvic organ prolapse (POP) involves increased inflammatory cells in uterosacral ligaments, suggesting complex causes. Identifying specific inflammatory patterns may lead to personalized treatments for this common condition.
Area of Science:
- Gynecology
- Pathology
- Immunology
Background:
- Pelvic organ prolapse (POP) affects up to 40% of women, with unclear etiologies despite known risk factors.
- Uterosacral ligaments (USLs) are crucial for uterine and vaginal support.
- Previous studies noted neutrophils in some POP patients' USLs, prompting further investigation.
Purpose of the Study:
- To investigate the presence and types of inflammatory cells in the uterosacral ligaments of women with POP.
- To correlate inflammatory cell presence with specific POP phenotypes and potential vascular involvement.
Main Methods:
- Immunohistochemical staining of USL tissue to identify neutrophils, lymphocytes, macrophages, and mast cells.
- Comparison of inflammatory cell presence in POP subtypes (POP-Inflammatory, POP-Vascular) versus controls.
Main Results:
- All four inflammatory cell types were elevated in the POP-Inflammatory (POP-I) phenotype USL tissue compared to controls.
- T-lymphocytes and macrophages were found in arterial walls of some POP-Vascular (POP-V) patients, suggesting arterial injury.
- Atherosclerosis markers (foamy macrophages) were present in USLs of some POP-V and control subjects.
Conclusions:
- Findings support a complex, multifactorial etiology for POP.
- Increased inflammatory cells in USLs are linked to specific POP phenotypes.
- Personalized prevention and treatment strategies for POP may be necessary based on underlying mechanisms.
Abstract:
Pelvic organ prolapse (POP), a downward descent of the vagina and/or uterus through the vaginal canal, is a prevalent condition affecting up to 40% of women. Several risk factors of POP have been identified, including childbirth, connective tissue defects, and chronic intra-abdominal pressure; however, the underlying etiologies of POP development are not fully understood, leading to a high burden on patients and the healthcare systems. The uterosacral ligaments are key support structures of the uterus and upper vagina. Our previous work describes observed histopathological changes in uterosacral ligament (USL) tissue and demonstrates the presence of neutrophils in a subgroup of POP individuals. This presence of neutrophils prompted an examination for the presence of a broader spectrum of inflammatory cell types in the USL. Immunohistochemical staining was performed to identify neutrophils, lymphocytes, macrophages, and mast cells outside of the vasculature. All 4 inflammatory cell types were increased in the POP-HQ system-defined POP-Inflammatory (POP-I) phenotype USL tissue relative to the USL tissues of control or other POP-HQ phenotypes. Focal T-lymphocyte and macrophage co-accumulations were observed in the arterial walls from some patients of the POP-vascular (POP-V) phenotype suggesting previous arterial injury. In addition, 1 control and 2 POP-V subjects' USLs contained arterial wall foamy macrophages, evidence of atherosclerosis. These findings further support a complex etiology for POP and indicate that personalized approaches to preventing and treating the condition may be warranted.
