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Underlying Mechanisms:
The exact cause of Stiff-Person Syndrome remains unclear, and it is considered an autoimmune disorder. Autoimmune conditions occur when the immune system, designed to protect the body, mistakenly attacks its tissues. In the case of SPS, the immune system targets the inhibitory neurons responsible for regulating muscle activity.
Anti-GAD antibodies, specifically anti-glutamic acid decarboxylase antibodies, are often found in individuals with SPS. These antibodies target an enzyme involved in the production of gamma-aminobutyric acid (GABA), a neurotransmitter that plays a crucial role in inhibiting nerve impulses. The loss of inhibitory signals due to the immune system’s attack results in the continuous firing of nerve signals, leading to muscle stiffness and spasms.
