A novel neuronal antigen identified by sera from patients with systemic lupus erythematosus.
Using human neuroblastoma cell lines (IMR-6, NMB-7, SK-N-Mc, SK-N-SH) as sources, we characterized surface neuronal antigens as an initial step in determining the pathogenic role and clinical significance of neuronal antibodies in systemic lupus erythematosus ( SLE) patients. SLE sera were screened for the presence of surface neuronal antibodies using a mixed hemadsorption assay. Thirty SLE sera were further tested by Western blotting and immunoprecipitation of lysed IMR-6 cells. Western blotting revealed binding to predominantly intracellular antigens, none of which was restricted to neuroblastoma cells. In contrast, immunoprecipitation experiments demonstrated binding to a 97K antigen, which appeared to be of surface origin, by 3 SLE sera. This was not present on non-neuronal cells and was not precipitated by sera from healthy or disease controls. This 97K antigen was also precipitated from the neuroblastoma cell line NMB-7, but was not present on SK-N-Mc or SK-N-SH cells. Precipitation was depleted by preabsorption with viable IMR-6 and NMB-7 cells, but not with non-neuronal cells. Thus, some SLE sera recognize a 97K neuronal antigen on select neuroblastoma cells.[1]References
- A novel neuronal antigen identified by sera from patients with systemic lupus erythematosus. Hanly, J.G., Rajaraman, S., Behmann, S., Denburg, J.A. Arthritis Rheum. (1988) [Pubmed]
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