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Polyneuropathy in Waldenström's macroglobulinaemia. Passive transfer from man to mouse
Abstract:
To support the hypothesis of an immunopathogenesis of polyneuropathy in Waldenström's macroglobulinaemia (MW), serum IgM fractions of MW patients were applied intraperitoneally to mice for 17 days. Sections of liver, kidney, M. glutaeus maximus, central nervous system (CNS) and both Nn. ischiadici were examined for IgM, IgG, C3 and as control IgD with PAP-immunostaining. IgM deposits were found in every organ except the CNS. In peripheral nerves larger amounts were visualized in perineurium and endoneural space, whereas myelin lamellae and periaxon did not stain. Therefore, perhaps our investigation reveals a greater permeability of the blood-nerve barrier (BNB) compared with the blood-brain barrier (BBB). The involvement of the monoclonal IgM of MW, which has been shown to react in vitro with peripheral nerve constituents, appears possible in the pathogenesis of polyneuropathy.
Insights
This study investigated Waldenström's macroglobulinaemia (MW) and polyneuropathy. It found IgM deposits in peripheral nerves of mice exposed to MW serum, suggesting a role for IgM in nerve damage.
Area of Science:
- Immunology
- Neurology
- Pathology
Background:
- Waldenström's macroglobulinaemia (MW) is a B-cell lymphoproliferative disorder.
- The immunopathogenesis of polyneuropathy in MW is not fully understood.
- Monoclonal IgM in MW may interact with peripheral nerve components.
Purpose of the Study:
- To investigate the hypothesis of immunopathogenesis of polyneuropathy in MW.
- To examine IgM deposition in various organs and peripheral nerves in a mouse model.
- To assess the potential role of monoclonal IgM in MW-associated polyneuropathy.
Main Methods:
- Serum IgM fractions from MW patients were administered intraperitoneally to mice for 17 days.
- Immunohistochemical staining (PAP) was used to detect IgM, IgG, C3, and IgD.
- Tissues examined included liver, kidney, gluteus maximus muscle, CNS, and sciatic nerves.
Main Results:
- IgM deposits were detected in all examined organs except the CNS.
- Significant IgM deposition was observed in the perineurium and endoneural space of peripheral nerves.
- Myelin lamellae and periaxons did not show IgM staining.
Conclusions:
- The findings suggest increased permeability of the blood-nerve barrier (BNB) compared to the blood-brain barrier (BBB).
- The monoclonal IgM in MW may contribute to the pathogenesis of polyneuropathy.
- Further research is warranted to elucidate the precise mechanisms involved.