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. 1987 Oct 1;166(4):890–908. doi: 10.1084/jem.166.4.890

Pathogenesis of arteritis of SL/Ni mice. Possible lytic effect of anti- gp70 antibodies on vascular smooth muscle cells

PMCID: PMC2188704  PMID: 2888832

Abstract

The SL/Ni strain of mice spontaneously develops a necrotizing polyarteritis (NPA) that is histologically quite similar to human polyarteritis nodosa. This NPA most frequently affected parametrial tissues and/or ovaries of females and small arterioles of the major salivary glands. Electron microscopic studies of early arterial lesions revealed massive budding of C-type particles from arterial smooth muscle cells just before or at the onset of arteritis. In addition, binding of mouse IgG and C3 to the plasma membrane of virus-producing smooth muscle cells was shown by immunoelectron microscopy. Antibody- bound muscle cells showed disintegration of their plasma membrane, but degeneration and necrosis of muscle cells were not associated with dense infiltration of neutrophils. SL/Ni mice had natural antibodies that bound specifically to a fibroblast cell line infected with an endogenous ecotropic murine leukemia virus (MuLV) recovered from a SL/Ni mouse. Most of the natural antibodies were cytotoxic in the presence of murine complement. Western blot immunoassays revealed that among 14 SL/Ni female mice tested, all of the 9 mice that were affected by arteritis had anti-gp70 antibodies, while the 3 anti-gp70- mice were not affected. The presence of anti-p30 or anti-p15 (anti-p12) antibodies, which were also detected in some SL/Ni mice, did not correlate with the development of arteritis. These results strongly support the hypothesis that NPA in SL/Ni mice is mediated by the lysis of arterial smooth muscle cells due to the deposition of cytotoxic natural antibodies directed to cell membrane-bound gp70 molecules of an endogenous ecotropic MuLV.

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Selected References

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