Abstract
Progressive multifocal leukoencephalopathy (PML) is a disease usually ocurring in immunosuppressed patients. By far the most common underlying immunosuppressive illness is the acquired immune deficiency snydrome, accounting for about 85% of PML cases currently seen in clinical practice. PML may occur in patients with deficits in the humoral and/or cellular immune response such as lymphoproliferative diseases, myeloproliferative diseases, carcinomatous diseases and acquired immunodeficiency due to autoimmune diseases and immunosuppressive therapy. The humoral immune response in PML is indicative of a persistent, reactivated infection with a prominent immunoglobulin (lgG) G synthesis to virus protein 1 (VP1). An lgM synthesis in serum is rarely found. In about 76% of PML cases, an intrathecal humoral immune response to recombinant VP1 can be found as compared to only 3.2% in healthy controls. The detection of intrathecally synthesized lgG antibodies to VP1 can be used as an additional diagnostic test for the diagnosis of PML. The magnitude of the intrathecal humoral immune response appears to rise over time and may be associated with a decrease of viral load in cerebrospinal fluid (CSF) and possibly the central nervous system (CNS). Compared to healthy controls, proliferation of peripheral blood mononuclear cells (PBMC) is reduced in PML patients. Immunological studies suggest a general impairment of the Th1-type T-helper cell function of cell-mediated immunity. Furthermore, the appearance of JCV-specific cytotoxic T-lymphocytes appears to be associated with a favorable clinical outcome.
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Weber, T., Weber, F., Petry, H. et al. Immune response in progressive multifocal leukoencephalopathy: An overview. Journal of NeuroVirology 7, 311–317 (2001). https://doi.org/10.1080/13550280152537166
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DOI: https://doi.org/10.1080/13550280152537166