Serum surfactant protein D is increased in acute and chronic inflammation in mice

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Surfactant protein A (SP-A) and surfactant protein D (SP-D) are important components of innate immunity that can modify the inflammatory response. However, alterations and regulation of SP-A and SP-D in acute and chronic inflammation are not well defined. In addition, serum SP-D may serve as a biomarker of lung inflammation.We determined the expression of SP-A and SP-D in murine models. To study acute inflammation, we instilled bleomycin intrabronchially. To study chronic lung inflammation, we used a transgenic mouse that overexpresses tumor necrosis factor (TNF)-α under the control of the SP-C promoter. These mice have a chronic mononuclear cell infiltration, airspace enlargement, pulmonary hypertension, and focal pulmonary fibrosis.In acute inflammation model, levels of mRNA for all surfactant proteins were reduced after bleomycin administration. However, serum SP-D was increased from days 7 to 28 after instillation. In chronic inflammation model, SP-D mRNA expression was increased, whereas the expression of SP-A, SP-B and SP-C was reduced. Both serum and lung SP-D concentrations were increased in chronic lung inflammation.These data clarified profile of SP-A and SP-D in acute and chronic inflammation and indicated that serum SP-D can serve as a biomarker of lung inflammation in both acute and chronic lung injury in mice.

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