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129X1/SvJ Mouse Strain Has a Novel Defect in Inflammatory Cell Recruitment¹

Peter White^2,*, Stephen A. Liebhaber^*, and Nancy E. Cooke^3,*,

^* Departments of Medicine and Genetics and Howard Hughes Medical Institute, University of Pennsylvania, Philadelphia, PA 19104; and Division of Endocrinology, Diabetes and Metabolism, Departments of Medicine and Genetics, University of Pennsylvania School of Medicine, Philadelphia, PA 19104

Vitamin D-binding protein (DBP) has been reported to contribute to innate immunity. To verify prior in vitro and cell-based observations supporting this role, we assessed the ability of a recently developed DBP-null mouse line to recruit neutrophils and macrophages to a site of chemical inflammation. The interrupted DBP allele had been generated by homologous recombination in 129X1/SvJ embryonic stem cells and these cells were subsequently used to generate a line of DBP^-/- (null) mice. Initial studies revealed a marked defect in the ability of these DBP^-/- mice to recruit cells to the peritoneum after localized thioglycolate injection. However, progressive outcrossing of the DBP^-/- mice to the C57BL/6J strain, conducted to provide a uniform genetic background for comparison of DBP-null and control mice, resulted in a progressive increase in cell recruitment by the DBP^-/- mice and a loss in their apparent recruitment defect when compared with the DPB wild-type controls. These data suggested that the observed recruitment phenotype initially attributed to the absence of DBP was not linked to the DBP locus, but instead reflected the underlying genetic composition of the 129X1/SvJ ES cells used for the initial DBP gene disruption. A profound cell recruitment defect was confirmed in the 129X1/SvJ mice by direct analysis. Each of three commonly used inbred lines was discovered to have a distinct level of cell recruitment to a uniform stimulus (C57BL/6J > BALB/c > CD1 > 129X1/SvJ). Thus, this study failed to support a unique role for DBP in cellular recruitment during a model inflammatory response. Instead, the data revealed a novel and profound defect of cell recruitment in 129X1/SvJ mice, the strain most commonly used for gene deletion studies.

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