Open Access Human Amnion Epithelial Cells Mediate Lung Repair by Directly Modulating Macrophage Recruitment and Polarization

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Abstract:

Human amnion epithelial cells (hAECs) have been shown to modulate inflammation and restore normal lung structure and respiratory function following bleomycin challenge in immune-competent mice. These effects are exerted despite a lack of significant engraftment of hAECs, suggesting that immunomodulatory effect mechanisms are at play. In this study, using the bleomycin model of injury, we explored the interactions between hAECs and macrophages. We administered 4 million hAECs intraperitoneally to C57Bl6 mice 24 h following a bleomycin challenge. Using FACS analysis and qPCR, we showed that hAEC administration significantly reduced macrophage infiltration into the lungs and that the majority of the pulmonary macrophages were of the M2 phenotype. Using bone marrow-derived macrophages, we then showed that hAEC-conditioned media could alter macrophage polarization, migration, and phagocytosis, without affecting macrophage survival or proliferation in vitro. This study provides the first evidence that hAECs directly influence macrophage behavior in a proreparative manner and suggests that hAECs are able to mediate these effects independently of other immune cell types.

Keywords: Human amnion epithelial cells (hAECs); Immune modulation; Lung inflammation; Macrophages; Placenta

Document Type: Research Article

DOI: http://dx.doi.org/10.3727/096368912X661409

Affiliations: The Ritchie Centre, Monash Institute of Medical Research, Monash University, Clayton, Victoria, Australia

Publication date: March 21, 2014

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  • Cell Transplantation publishes original, peer-reviewed research and review articles on the subject of cell transplantation and its application to human diseases. To ensure high-quality contributions from all areas of transplantation, separate section editors and editorial boards have been established. Articles deal with a wide range of topics including physiological, medical, preclinical, tissue engineering, and device-oriented aspects of transplantation of nervous system, endocrine, growth factor-secreting, bone marrow, epithelial, endothelial, and genetically engineered cells, among others. Basic clinical studies and immunological research papers are also featured. To provide complete coverage of this revolutionary field, Cell Transplantation will report on relevant technological advances, and ethical and regulatory considerations of cell transplants. Cell Transplantation is now an Open Access journal starting with volume 18 in 2009, and therefore there will be an inexpensive publication charge, which is dependent on the number of pages, in addition to the charge for color figures. This will allow work to be disseminated to a wider audience and also entitle the corresponding author to a free PDF, as well as prepublication of an unedited version of the manuscript.
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