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Molecular Imaging and Biology

, Volume 19, Issue 5, pp 694–702 | Cite as

Imaging of Tumor-Associated Macrophages in a Transgenic Mouse Model of Orthotopic Ovarian Cancer

  • Huanhuan He
  • Alan C. Chiu
  • Masamitsu Kanada
  • Bruce T. Schaar
  • Venkatesh Krishnan
  • Christopher H. Contag
  • Oliver DorigoEmail author
Research Article

Abstract

Purpose

Tumor-associated macrophages (TAMs) are often associated with a poor prognosis in cancer. To gain a better understanding of cellular recruitment and dynamics of TAM biology during cancer progression, we established a novel transgenic mouse model for in vivo imaging of luciferase-expressing macrophages.

Procedures

B6.129P2-Lyz2tm1(cre)Ifo/J mice, which express Cre recombinase under the control of the lysozyme M promoter (LysM) were crossed to Cre-lox Luc reporter mice (RLG), to produce LysM-LG mice whose macrophages express luciferase. Cell-type-specific luciferase expression in these mice was verified by flow cytometry, and via in vivo bioluminescence imaging under conditions where macrophages were either stimulated with lipopolysaccharide or depleted with clodronate liposomes. The distribution of activated macrophages was longitudinally imaged in two immunocompetent LysM-LG mouse models with either B16 melanoma or ID8 ovarian cancer cells.

Results

In vivo imaging of LysM-LG mice showed luciferase activity was generated by macrophages. Clodronate liposome-mediated depletion of macrophages lowered overall bioluminescence while lipopolysaccharide injection increased macrophage bioluminescence in both the B16 and ID8 models. Tracking macrophages weekly in tumor-bearing animals after intraperitoneal (i.p.) or intraovarian (i.o.) injection resulted in distinct, dynamic patterns of macrophage activity. Animals with metastatic ovarian cancer after i.p. injection exhibited significantly higher peritoneal macrophage activity compared to animals after i.o. injection.

Conclusion

The LysM-LG model allows tracking of macrophage recruitment and activation during disease initiation and progression in a noninvasive manner. This model provides a tool to visualize and monitor the benefit of pharmacological interventions targeting macrophages in preclinical models.

Key words

Macrophages Bioluminescence Transgenic mice Ovarian cancer 

Notes

Acknowledgements

This work was supported by the Mary Lake Polan Gynecologic Oncology Endowment for Research (O. D.), the Vivian Scott Fellowship in Gynecologic Oncology (O. D.), the Dean Pizzo Stanford Cancer Center Research Award (O. D.), the Child Health Research Institute at Stanford (C. C.), and a generous gift from the Chambers Family Foundation for Excellence in Pediatric Research (C.C.).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

11307_2017_1061_MOESM1_ESM.pdf (347 kb)
ESM 1 (PDF 347 kb)

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Copyright information

© World Molecular Imaging Society 2017

Authors and Affiliations

  1. 1.Departments of Obstetrics and GynecologyStanford University School of MedicineStanfordUSA
  2. 2.Departments of PediatricsStanford University School of MedicineStanfordUSA
  3. 3.Departments of Microbiology and ImmunologyStanford University School of MedicineStanfordUSA
  4. 4.Departments of RadiologyStanford University School of MedicineStanfordUSA

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