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Am J Physiol Lung Cell Mol Physiol 278: L365-L373, 2000;
1040-0605/00 $5.00
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Vol. 278, Issue 2, L365-L373, February 2000

Pulmonary-specific expression of SP-D corrects pulmonary lipid accumulation in SP-D gene-targeted mice

James H. Fisher1, Vladimir Sheftelyevich1, Ye-Shih Ho2, Suzanne Fligiel3, Francis X. McCormack4, Thomas R. Korfhagen5, Jeffrey A. Whitsett5, and Machiko Ikegami5

1 Pulmonary/Critical Care Medicine, Denver Health Medical Center and University of Colorado Health Sciences Center, Denver, Colorado 80262; 5 Division of Pulmonary Biology, Children's Hospital Medical Center, and 4 Pulmonary and Critical Care Medicine, University of Cincinnati School of Medicine, Cincinnati, Ohio 45229-3039; 2 Institute of Chemical Toxicology, Wayne State University, and 3 Department of Pathology, John D. Dingell Veterans Affairs Medical Center, Detroit, Michigan 48201

Targeted disruption of the surfactant protein (SP) D (SP-D) gene caused a marked pulmonary lipoidosis characterized by increased alveolar lung phospholipids, demonstrating a previously unexpected role for SP-D in surfactant homeostasis. In the present study, we tested whether the local production of SP-D in the lung influenced surfactant content in SP-D-deficient [SP-D(-/-)] and SP-D wild-type [SP-D(+/+)] mice. Rat SP-D (rSP-D) was expressed under control of the human SP-C promoter, producing rSP-D, SP-D(+/+) transgenic mice. SP-D content in bronchoalveolar lavage fluid was increased 30- to 50-fold in the rSP-D, SP-D(+/+) mice compared with the SP-D(+/+) parental strain. Lung morphology, phospholipid content, and surfactant protein mRNAs were unaltered by the increased concentration of SP-D. Likewise, the production of endogenous mouse SP-D mRNA was not perturbed by the SP-D transgene. rSP-D, SP-D(+/+) mice were bred to SP-D(-/-) mice to assess whether lung-selective expression of SP-D might correct lipid homeostasis abnormalities in the SP-D(-/-) mice. Selective expression of SP-D in the respiratory epithelium had no adverse effects on lung function, correcting surfactant phospholipid content and decreasing phosphatidylcholine incorporation significantly. SP-D regulates surfactant lipid homeostasis, functioning locally to inhibit surfactant phospholipid incorporation in the lung parenchyma and maintaining alveolar phospholipid content in the alveolus. Marked increases in biologically active tissue and alveolar SP-D do not alter lung morphology, macrophage abundance or structure, or surfactant accumulation.

pulmonary surfactant; alveolar epithelium; alveolar macrophage; surfactant protein D; surfactant protein A; saturated phosphatidylcholine


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