Simultaneous absence of surfactant proteins A and D increases lung inflammation and injury after allogeneic HSCT in mice Academic Article uri icon

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abstract

  • The relative contributions of the hydrophilic surfactant proteins (SP)-A and -D to early inflammatory responses associated with lung dysfunction after experimental allogeneic hematopoietic stem cell transplantation (HSCT) were investigated. We hypothesized that the absence of SP-A and SP-D would exaggerate allogeneic T cell-dependent inflammation and exacerbate lung injury. Wild-type, SP-D-deficient (SP-D−/−), and SP-A and -D double knockout (SP-A/D−/−) C57BL/6 mice were lethally conditioned with cyclophosphamide and total body irradiation and given allogeneic bone marrow plus donor spleen T cells, simulating clinical HSCT regimens. On day 7, after HSCT, permeability edema progressively increased in SP-D−/− and SP-A/D−/− mice. Allogeneic T cell-dependent inflammatory responses were also increased in SP-D−/− and SP-A/D−/− mice, but the altered mediators of inflammation were not identical. Compared with wild-type, bronchoalveolar lavage fluid (BALF) levels of nitrite plus nitrate, GM-CSF, and MCP-1, but not TNF-α and IFN-γ, were higher in SP-D-deficient mice before and after HSCT. In SP-A/D−/− mice, day 7 post-HSCT BALF levels of TNF-α and IFN-γ, in addition to nitrite plus nitrate and MCP-1, were higher compared with mice lacking SP-D alone. After HSCT, both SP-A and SP-D exhibited anti-inflammatory lung-protective functions that were not completely redundant in vivo.

authors

  • Gram, Kendra
  • Yang, Shuxia
  • Steiner, Marie
  • Somani, Arif
  • Hawgood, Samuel
  • Blazar, Bruce R
  • Panoskaltsis-Mortari, Angela
  • Haddad, Imad Y

publication date

  • February 2009

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