The sarcoplasmic reticulum from muscle of swine which are susceptible to malignant hyperpyrexia is deficient in inositol 1,4,5-trisphosphate phosphatase (InsP35-ase) activity, which leads to high intracellular concentrations of inositol 1,4,5-trisphosphate (InsP3) and of calcium ions. Halothane inhibits InsP35-ase and further increases myoplasmic InsP3 and calcium ion concentrations, and produces the clinical features of malignant hyperpyrexia.
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Purkinje cell (PC) antibody positivity in a patient with autoimmune glial fibrillary acidic protein (GFAP) astrocytopathy.
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Department of Neurology, The Second Affiliated Hospital of GuangZhou Medical University, Guangzhou, Guangdong Province, China.
Purpose: This case report is the first to describe the detection of antibodies against inositol 1,4,5-trisphosphate receptor 1 (ITPR1, I3PR) in a patient diagnosed with autoimmune glial fibrillary acidic protein (GFAP) astrocytopathy. ITPR1 is known as one of the Purkinje cell antibodies present in autoimmune cerebellar ataxia (ACA). Here, we described the association between autoimmune GFAP astrocytopathy and autoimmune cerebellar disease (ACD).
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