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Expression, and Diminishes Systemic Pathology1
Laboratory of Molecular Autoimmune Disease, Renal Division, Brigham and Womens Hospital, Boston, MA 02115
Autoimmune disease in MRL-Faslpr mice is characterized by fatal nephritis, systemic pathology, and autoantibodies, mimicking human lupus. We previously reported that 1) intrarenal IL-12 elicits nephritis by fostering the accumulation of intrarenal IFN-
-secreting T cells, and 2) MRL-Faslpr mice deficient in the IFN-
receptor were spared from nephritis. Therefore, we hypothesized that eliminating IL-12 in MRL-Faslpr mice reduces IFN-
-secreting cells and thereby prevents systemic pathology. For this purpose, we constructed an IL-12p40-deficient MRL-Faslpr(IL-12-/-) strain. We determined that glomerular and interstitial, but not perivascular, renal pathology were decreased in IL-12-/- mice vs the wild-type (WT) strain (5 mo of age). Similarly, systemic pathology (lung, lacrimal and salivary glands, skin, and lymphadenopathy) was diminished. The intrarenal accumulation of T cells (CD4+, CD8+, CD4-CD8-B220+) and macrophages was dramatically reduced in IL-12-/- MRL-Faslpr kidneys. We determined that there were fewer IFN-
transcripts (>70%) in the IL-12-/- protected kidneys compared with the WT kidneys. Similarly, cells propagated from IL-12-/- MRL-Faslpr kidneys generated substantially less IFN-
when stimulated with IL-12 and IL-18 compared with those from WT kidneys, and we detected fewer CD8 and B220 T cells producing IFN-
in these IL-12-/- MRL-Faslpr kidneys. Of note, survival was modestly extended in the IL-12-/- MRL-Faslpr mice. While lung and lacrimal and salivary gland pathology remained reduced in moribund IL-12-/- MRL-Faslpr mice, renal pathology and IFN-
expression were equivalent to those in the WT strain. Thus, we suggest that IL-12 is a therapeutic target for multiple tissues in lupus; however blocking IL-12 alone is not sufficient to confer enduring protection from lupus nephritis.
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