Cited by 47Endometriosis Research and TreatmentEctopic Pregnancy Diagnosis and ManagementPlant and fungal interactions

The establishment of a mouse model of deep endometriosis

Open access
Yan, Dingmin, Liu, Xishi, Guo, Sun-Wei·2019·Human Reproduction

Abstract

STUDY QUESTION: Is it possible to establish a mouse model of deep endometriosis (DE)? SUMMARY ANSWER: A mouse DE model that is macroscopically and microscopically similar to nodular lesions in humans can be constructed in as short as 3 weeks by intraperitoneal injection of uterine fragments along with the infusion of substance P (SP) and/or calcitonin gene-related peptide (CGRP). WHAT IS KNOWN ALREADY: Although a baboon DE model was reported 5 years ago, its prohibitive cost and demand for facilities and expertise associated with the use of non-human primates put its use out of reach for most laboratories. STUDY DESIGN, SIZE, DURATION: A total of 48 female Balb/C mice were used for this study. Among them, 16 were randomly selected as donors that contributed uterine fragments, and the remaining 32 were recipient mice. The mice with induced endometriosis were followed up for 3-4 weeks. PARTICIPANTS/MATERIALS, SETTING, METHODS: One day before the induction of endometriosis by intraperitoneal injection of uterine fragments, osmotic pumps were inserted into equal groups of recipient mice to infuse either sterile saline, SP, CGRP, or both SP and CGRP. The hotplate test was administrated to all mice at the baseline and before and after induction of endometriosis. Four (3 for the SP+CGRP group) weeks after induction, all mice were sacrificed. Their endometriotic lesions were excised, weighed and processed for histopathologic examination, and histochemistry, immunohistochemistry and immunofluorescence analyses of markers of proliferation, angiogenesis, epithelial-mesenchymal transition (EMT), fibroblast-to-myofibroblast transdifferentiation (FMT), smooth muscle metaplasia (SMM), mesothelial-mesenchymal transition (MMT) and endothelial-mesenchymal transition (EndoMT) were done. The extent of lesional fibrosis was evaluated by Masson trichrome staining. To further evaluate surrounding organ/tissue invasion, the peritoneal areas adhesive to the lesions were excised for immunohistochemical analysis. MAIN RESULTS AND THE ROLE OF CHANCE: Endometriotic lesions in mice treated with SP and/or CGRP satisfied all requirements for DE, i.e. presence of endometrial epithelial and stromal cells, abundance of fibromuscular content, and encapsulation in surrounding tissues or organs. The lesion weight in the CGRP, SP and SP+CGRP groups was 1.62, 2.14 and 2.18-fold, respectively, heavier than that of control group. Concomitantly, the SP, CGRP and SP+CGRP groups had significantly shorter hotplate latency than that of control group. Lesions in mice treated with SP and/or CGRP, especially with SP+CGRP, exhibited characteristics consistent with EMT, FMT, SMM and extensive fibrosis, along with signs of MMT and EndoMT. Lesional invasion into surrounding tissues/organs was found to be 25.0, 75.0 and 87.5% in mice treated with CGRP, SP and SP+CGRP, but none in control mice. LARGE SCALE DATA: N/A. LIMITATIONS, REASONS FOR CAUTION: This study is limited by the use of histologic and immunohistochemistry analyses only and lacks molecular data. WIDER IMPLICATIONS OF THE FINDINGS: The establishment of a mouse DE model supports the idea that endometriotic lesions are wounds undergoing repeated tissue injury and repair and underscores the importance of microenvironments in shaping the lesions' destiny. In addition, signs consistent with MMT and EndoMT indicate that there may be more culpable factors that still remain unidentified and should be pursued in the future. Moreover, the close correlation between the extent of lesional fibrosis and markers of EMT, MMT, EndoMT, FMT and SMM as shown here should facilitate our understanding of the molecular mechanisms underlying the DE pathophysiology. Since this DE model is based on a biologically plausible and evidence-backed theory, it should shed much needed insight into the molecular mechanisms underlying the pathophysiology of DE. STUDY FUNDING/COMPETING INTEREST(S): This research was supported by Grants 81471434 (S.W.G.), 81530040 (S.W.G.), 81771553 (S.W.G.), 81671436 (X.S.L.) and 81871144 (X.S.L.) from the National Natural Science Foundation of China. None of the authors has any conflict of interest to disclose.

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  • Sensory nerve fibers play a potent facilitatory role in expediting the development and fibrogenesis of endometriotic lesions.

    “These data, taken together with our in vivo data35 in conjunction with the successful establishment of a mouse DE model of by infusion of SP and CGRP in addition to i.p. endometrium injection45 provide an additional strong piece of evidence that sensory nerve fibers play a potent facilitatory role in expediting the development and fibrogenesis of endometriotic lesions.”

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Authors
Yan, D., Liu, X., & Guo, S.-W.
Affiliations
Fudan University (CN)
Corresponding author
Guo, Sun-Wei
Venue
Human Reproduction
Published
2018-12-15
Volume
34
Issue
2
Pages
235-247
ISSN
  • 0268-1161 (ISSN-L)
  • 1460-2350
OpenAlex
W2904382647
Cited by
47
References
50
Citations by year
2026: 3 · 2025: 7 · 2024: 6 · 2023: 2 · 2022: 9 · 2021: 5 · 2020: 12 · 2019: 3
FWCI
5.36
Type
journal article
Language
en
Open access
Locations
  • Human Reproduction (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation of China (81471434, 81530040, 81771553, 81671436, 81871144)
  • Excellence in Centers of Clinical Medicine grant (2017ZZ01016)
  • Science and Technology Commission of Shanghai Municipality
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Endometriosis Research and Treatment
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Ectopic Pregnancy Diagnosis and Management
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Plant and fungal interactions
Keywords
deep infiltrating endometriosis, mouse model, substance P, calcitonin gene-related peptide, neurogenic inflammation, endometriotic nodules, fibrosis, epithelial-mesenchymal transition, fibroblast-to-myofibroblast transdifferentiation, mesothelial-to-mesenchymal transition
MeSH terms
Animals, Disease Models, Animal, Endometriosis, Endometrium, Female, Fibrosis, Humans, Injections, Intraperitoneal, Peritoneal Diseases, Peritoneum, Substance P, Calcitonin Gene-Related Peptide, Mice, Cell Transdifferentiation, Myofibroblasts, Epithelial-Mesenchymal Transition

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