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Serologic responses to nerve antigens in sooty mangabey monkeys with experimental leprosy
1Department of Microbiology, Yonsei University College of Medicine, Seoul, Republic of Korea.
Abstract:
Eight sooty mangabey monkeys were inoculated intravenously and intradermally with varying doses of Mycobacterium leprae from 4.8 x 10(7) to 4.8 x 10(10). Serum samples were obtained from the animals at intervals of about 3 months for 90 months, and were examined for IgM and IgG antibodies to nerve antigens, including ceramide, galactocerebroside (GC), and asialo-GM1 (AGM1), using an enzyme-linked immunosorbent assay (ELISA). The serological results were then compared with clinical findings, particularly nerve involvement. Of 8 mangabey monkeys inoculated with M. leprae, 7 animals had clinical leprosy; 6 of them had nerve damage, including neurologic deformities in 4 monkeys and nerve enlargement in 2. Median time for the initial signs of leprosy was 10 months postinoculation (p.i.), a range from 4 to 35 months. In contrast, nerve damage was noted rather late, about 35 to 86 months p.i. (median 54 months). The major immunoglobulin class to ceramide, GC, and AGM1 antigens was IgM, and the antibody responses to the nerve antigens appeared from 15 to 63 months p.i. (median 37 months). Antineural antibodies were thus detectable about 18 months (range -2 to 60 months) prior to observable nerve damage. In addition, elevation of antineural antibody levels were predictive of clinical exacerbation of the disease and neuritic damage. This study suggests that antineural antibodies are produced during the course of M. leprae infection and may be indicative of nerve damage, such as neurological deformities or nerve enlargement, in leprosy patients.
Insights
Antineural antibodies, particularly IgM, are produced during Mycobacterium leprae infection in sooty mangabeys. These antibodies can be detected before nerve damage, indicating potential for early leprosy diagnosis.
Area of Science:
- Immunology
- Infectious Diseases
- Neurology
Background:
- Leprosy, caused by Mycobacterium leprae, can lead to significant nerve damage.
- Early detection of nerve involvement in leprosy remains a challenge.
Purpose of the Study:
- To investigate the production of antineural antibodies in sooty mangabeys infected with M. leprae.
- To correlate serological findings with clinical signs of nerve damage.
Main Methods:
- Eight sooty mangabey monkeys were inoculated with M. leprae.
- Serum samples were analyzed for IgM and IgG antibodies against nerve antigens (ceramide, galactocerebroside, asialo-GM1) using ELISA.
- Serological results were compared with clinical observations of leprosy and nerve involvement.
Main Results:
- Seven of eight monkeys developed clinical leprosy, with six showing nerve damage.
- Antineural antibodies (primarily IgM) were detected between 15-63 months post-inoculation, preceding clinical nerve damage by up to 18 months.
- Elevated antineural antibody levels predicted disease exacerbation and neuritic damage.
Conclusions:
- Antineural antibodies are produced during M. leprae infection.
- These antibodies may serve as early indicators of nerve damage in leprosy patients.
- The findings suggest a potential role for antineural antibodies in monitoring leprosy progression.