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[Leprous neuropathy--observation from the standpoint vasculitis]
11st Department of Internal Medicine, School of Medicine, Kyorin University.
Abstract:
Pathogenesis of leprous neuropathy was studied from the standpoint of vasculitis. In vasculitic syndrome, mononeuritis multiplex is the most specific peripheral nerve injury. It occurs most frequently in small vessel vasculitis. Among them, the incidence is highest in microscopic polyangitis (MPO), Churg-Strauss Syndrome (CSS), and Wegener's granulomatosis (WG). All of them are categorized as ANCA associated disease. Because the disease activity is parallel with ANCA titer and ANCA is related directory to the pathogenesis of necrotizing vasculitis as well as the occurrence of peripheral neuropathy. Other small vessel vasculitis, such as lupus or rheumatoid vasculitis which are believed to occur by immune complex mechanism, are accompanied seldom by peripheral neuropathy. In WG, there are granulomatous lesions in upper and lower respiratory tracts which are supposed to be induced by Th1 dominant CD4 T cell infiltration. In cases of leprosy, if peripheral neuropathy were related to small vessel vasculitis, there might be two different pathogenesis. One is granulomatous vasculitis like WG in tuberculoid type. The other is immune complex type necrotizing vasculitis like SLE in lepromatous type, especially ENL. The site of these events may be small vessel in epineurium. Further immunologic studies are needed to clarify detailed mechanisms of leprous neuropathy.
Insights
Leprous neuropathy may stem from vasculitis, potentially involving two distinct pathways: granulomatous inflammation seen in tuberculoid leprosy and immune complex-driven necrotizing vasculitis in lepromatous leprosy, particularly ENL.
Area of Science:
- Neurology
- Immunology
- Pathology
Context:
- Leprosy can cause peripheral neuropathy, a debilitating condition.
- The pathogenesis of leprous neuropathy is not fully understood.
- Vasculitis, inflammation of blood vessels, is implicated in various neuropathies.
Purpose:
- To investigate the potential role of vasculitis in the pathogenesis of leprous neuropathy.
- To differentiate between potential vasculitic mechanisms in different forms of leprosy.
Summary:
- Mononeuritis multiplex, a specific peripheral nerve injury, is characteristic of vasculitic syndromes, especially small vessel vasculitis like ANCA-associated diseases.
- Leprous neuropathy may arise from two distinct vasculitic pathways: granulomatous vasculitis (similar to Wegener's granulomatosis) in tuberculoid leprosy and immune complex-mediated necrotizing vasculitis (similar to lupus vasculitis) in lepromatous leprosy, particularly erythema nodosum leprosum (ENL).
- These vasculitic processes likely affect small epineurial vessels.
Impact:
- This study provides a framework for understanding the immunologic basis of leprous neuropathy.
- Highlights the need for further research into the specific immunologic mechanisms.
- Could inform future diagnostic and therapeutic strategies for managing leprous neuropathy.