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Circulating and tissue immune complexes in mercury-treated mice.

P Hultman1, T Skogh, S Eneström

  • 1Department of Pathology, Linköping University, Sweden.

Journal of Clinical & Laboratory Immunology
|August 1, 1989
PubMed
Summary

Mercury exposure increased circulating immune complexes (CIC) in mice. The type of immune deposits, primarily IgG1, correlated with mild kidney injury, unlike in aged MRL-lpr/lpr mice.

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Area of Science:

  • Immunology
  • Toxicology
  • Nephrology

Background:

  • Circulating immune complexes (CIC) play a role in autoimmune diseases and can deposit in kidneys.
  • Mercury is a known environmental toxin with potential immunomodulatory effects.
  • Understanding mercury's impact on immune complex formation and deposition is crucial for assessing its health risks.

Purpose of the Study:

  • To investigate the effect of mercury exposure on circulating immune complexes (CIC) in different mouse strains.
  • To analyze the composition and location of immune deposits in mercury-treated mice.
  • To correlate immune complex deposition with kidney pathology following mercury exposure.

Main Methods:

  • Quantification of CIC using conglutinin-binding assay and polyethylene glycol (PEG) precipitation test in mercury-treated Balb/c, SJL, and C57BL/6J mice.
  • Analysis of blood clearance of preformed soluble immune complexes (IC).
  • Histopathological examination of kidney tissues and characterization of mesangial and vessel wall deposits (IgG isotypes, C3).

Main Results:

  • Mercury treatment led to a transient increase in CIC in SJL mice and increased CIC in Balb/c mice (PEG test).
  • Blood clearance of preformed IC was not impaired.
  • Mesangial deposits in mercury-treated SJL mice were predominantly IgG1, with less IgG2a and C3 compared to MRL-lpr/lpr mice. Vessel wall deposits showed IgG1, with some IgG2 and C3 in a few mice. Kidney pathology was mild (glomerulopathy) in mercury-treated SJL mice, contrasting with severe glomerulonephritis in MRL-lpr/lpr mice.

Conclusions:

  • Mercury exposure can induce circulating immune complexes in susceptible mouse strains.
  • The composition of immune deposits, particularly the predominance of IgG1, may influence the severity of kidney injury.
  • Mercury-induced CIC may contribute to systemic immune deposit formation, but the resulting tissue damage appears limited, possibly due to the specific IgG isotype involved.

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