Pentraxin 3 deficiency enhances features of chronic rejection in a mouse orthotopic lung transplantation model
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Mitsuteru Yoshida1, Hisashi Oishi1, Tereza Martinu1,2,3, David M. Hwang1,4, Hiromitsu Takizawa1, Junichi Sugihara1, Trevor D. McKee1, Xiaohui Bai1, Zehong Guana1, Christina Lua1, Hae-Ra Cho1, Stephen Juvet1,2,3, Marcelo Cypel1,2,5, Shaf Keshavjee1,2,5 and Mingyao Liu1,2,3,5
1Latner Thoracic Surgery Research Laboratories, Toronto General Hospital Research Institute, University Health Network, Toronto, Ontario, Canada
2Institute of Medical Science, University Health Network, Toronto, Ontario, Canada
3Department of Medicine, University Health Network, Toronto, Ontario, Canada
4Laboratory Medicine and Pathobiology, University Health Network, Toronto, Ontario, Canada
5Surgery, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
Mingyao Liu, email: firstname.lastname@example.org
Keywords: innate immunity; Micro-CT; bronchiolitis obliterans; lymphatic aggregates; Th1/Th2 response
Received: July 03, 2017 Accepted: November 12, 2017 Published: January 03, 2018
Chronic lung allograft dysfunction (CLAD) is a serious complication after lung transplantation and thought to represent chronic rejection. Increased expression of Pentraxin 3 (PTX3), an acute phase protein, was associated with worse outcome in lung transplant patients. To determine the role of recipient PTX3 in development of chronic rejection, we used a minor alloantigen-mismatched murine orthotopic single lung transplant model. Male C57BL/10 mice were used as donors. Male PTX3 knockout (KO) mice and their wild type (WT) littermates on 129/SvEv/C57BL6/J background were used as recipients. In KO recipients, 7/13 grafted lungs were consolidated without volume recovery on CT scan, while only 2/9 WT mice showed similar graft consolidation. For grafts where lung volume could be reliably analyzed by CT scan, the lung volume recovery was significantly reduced in KO mice compared to WT. Interstitial inflammation, parenchymal fibrosis and bronchiolitis obliterans scores were significantly higher in KO mice. Presence of myofibroblasts and lymphoid aggregation was significantly enhanced in the grafts of PTX3 KO recipients. Recipient PTX3 deficiency enhanced chronic rejection-like lesions by promoting a fibrotic process in the airways and lung parenchyma. The underlying mechanisms and potential protective role of exogenous PTX3 as a therapy should be further explored.
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