What question did this study set out to answer?

To evaluate the distribution and expression patterns of class 1 and class 2 major histocompatibility complex products and beta 2 microglobulin in muscle tissue across various neuromuscular disorders.

January 1, 1988Annals of Neurology

Expression of immunoreactive major histocompatibility complex products in human skeletal muscles

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Authors

GKGeorge KarpatiMontreal Neurological Institute and Hospital YPYannick PouliotTempus Labs (United States)SCStirling CarpenterUniversity of Toronto

Discussion

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Implication

Biopsy analysis demonstrates distinct sarcolemmal class 1 MHC expression across inflammatory myopathies, indicating immune-mediated targeting and cellular stress.

Key Points

To evaluate the distribution and expression patterns of class 1 and class 2 major histocompatibility complex products and beta 2 microglobulin in muscle tissue across various neuromuscular disorders.
Examined cryostat sections of skeletal muscle biopsies from 67 patients presenting with normal muscle, Duchenne dystrophy, chronic denervation, polymyositis, dermatomyositis, inclusion body myositis, and other conditions.
Assessed immunoreactive class 1 and class 2 MHC gene products and beta 2 microglobulin using microscopic immunocytochemistry.
Normal mature muscle fibers lacked MHC expression, whereas blood vessels expressed class 1 and 2 MHC, and regenerating fibers consistently showed sarcolemmal class 1 MHC reactivity across all disease categories.
Extensive sarcolemmal class 1 MHC expression was observed in polymyositis, dermatomyositis, and inclusion body myositis, with intense expression occurring in nonnecrotic fibers invaded by cytotoxic lymphocytes.
Dermatomyositis cases displayed prominent class 1 MHC staining in perifascicular regions and zones of capillary loss, consistent with an ischemia-associated cellular stress response.

Cite This Study

Karpati et al. (1988) studied this question.

synapsesocial.com/papers/6a7de9f3cf7e8b32dacb58f9 https://doi.org/10.1002/ana.410230111

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Implication

Biopsy analysis demonstrates distinct sarcolemmal class 1 MHC expression across inflammatory myopathies, indicating immune-mediated targeting and cellular stress.

Expression of immunoreactive major histocompatibility complex products in human skeletal muscles

Discussion

Member takes

Implication

Key Points

Cite This Study

Expression of immunoreactive major histocompatibility complex products in human skeletal muscles

Discussion

Member takes

Implication

Key Points

Cite This Study

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Also Consider