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Membrane attack complex in thickened cutaneous sensory nerves of leprosy patients
O Parkash1, V Kumar, A Mukherjee
1Central JALMA Institute for Leprosy, Tajganj, Agra, India.
Abstract:
Membrane attack complex (MAC) is a terminal end product produced as a result of complement activation. The deposition of MAC, in tissues, is known to have a local tissue damaging effect in several clinical conditions. Therefore, an attempt was made to demonstrate MAC in peripheral nerve biopsies, collected from leprosy patients. Interestingly, we could demonstrate deposition of MAC in involved cutaneous sensory nerves from most of the lepromatous leprosy patients. Contrary to this, majority of nerve biopsies from tuberculoid leprosy patients did not stain for MAC. Though MAC positive sections showed reactivity for S-protein, our observations support the possibility that MAC, either acting directly or indirectly, may be implicated in nerve damage, at least, in lepromatous leprosy patients.
Insights
Membrane attack complex (MAC) deposition was found in nerves of lepromatous leprosy patients, suggesting its role in nerve damage. This finding was not observed in tuberculoid leprosy patients, differentiating disease mechanisms.
Area of Science:
- Immunology
- Neurology
- Pathology
Background:
- The Membrane Attack Complex (MAC) is a key component of the complement system.
- MAC deposition in tissues can cause local damage.
- Leprosy is a disease that affects peripheral nerves.
Purpose of the Study:
- To investigate the presence of MAC in peripheral nerve biopsies from leprosy patients.
- To determine if MAC deposition correlates with specific leprosy types.
Main Methods:
- Peripheral nerve biopsies were collected from leprosy patients.
- Immunohistochemical staining was used to detect MAC deposition.
- S-protein reactivity was also assessed.
Main Results:
- MAC deposition was detected in cutaneous sensory nerves of most lepromatous leprosy patients.
- The majority of tuberculoid leprosy patient nerve biopsies did not show MAC staining.
- MAC-positive sections exhibited S-protein reactivity.
Conclusions:
- MAC may play a role in nerve damage in lepromatous leprosy.
- The presence or absence of MAC may help differentiate leprosy subtypes and their pathological mechanisms.