Abstract
Clinical and experimental findings in idiopathic amyothrophic lateral sclerosis (ALS) would be compatible with a retroviral involvement. In 35 adult patients with non-familial ALS we observed elevated circulating immune complexes, a decrease in IgG3 isotype and enzyme-linked sorbent assay (ELISA) serum antibodies against human spuma retrovirus (HSRV), confirmed by specific human foamy virus immunoblots. All 35 were negative for IgM or relevant IgG anti-ganglioside antibodies. We treated 12 HIV-negative, immune-complex-positive ALS patients with 500 mg d-1 zidovudine p.o. over 2-10 months and found reductions of serum creatine kinase and circulating immune complexes from two days to two weeks after the beginning of medication.
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