Am J Psychiatry 158:605-610, April 2001
© 2001 American Psychiatric Association
Elevated D8/17 Expression on B Lymphocytes, a Marker of Rheumatic Fever, Measured With Flow Cytometry in Tic Disorder Patients
Pieter J. Hoekstra, M.D.,
Johan Bijzet, B.Sc.,
Pieter C. Limburg, Ph.D.,
Mark-Peter Steenhuis, M.Sc.,
Pieter W. Troost, M.D.,
Menno D. Oosterhoff, M.D.,
Jakob Korf, Ph.D.,
Cees G.M. Kallenberg, M.D., Ph.D., and
Ruud B. Minderaa, M.D., Ph.D.
OBJECTIVE: Elevated D8/17 expression on B lymphocytes is a known susceptibility marker of rheumatic fever. Previous studies have reported higher than usual D8/17 expression on B lymphocytes of patients with tic disorders. The purpose of this study was to assess D8/17 expression on B lymphocytes of tic disorder patients by using an objective method in which no operator variability was involved. METHOD: D8/17 expression on B lymphocytes was assessed with flow cytometry by using an immunoglobulin M (IgM) monoclonal D8/17-specific antibody in an unselected group of Dutch patients with tic disorders (N=33) and healthy volunteers (N=20). Binding of this monoclonal antibody was compared with binding of an irrelevant IgM monoclonal antibody, and the shift in mean fluorescence intensity of the D8/17-specific antibody compared to that of the irrelevant IgM monoclonal antibody was used as a measure of D8/17 overexpression. For the patients, Yale Global Tic Severity Scale scores were used to assess disease severity. RESULTS: D8/17 overexpression in the patient group (mean=16.8 arbitrary units, SD=30.5) was significantly higher than in the comparison group (mean=3.2, SD=3.0). A significant minority of the patients (N=13, 39.4%), however, had levels of D8/17 overexpression within the range of that of the healthy comparison subjects. Flow cytometric analysis did not indicate a separate subpopulation of D8/17-positive B cells. CONCLUSIONS: These data confirm the utility of D8/17 B cell overexpression as a peripheral blood marker in patients with tic disorders and are compatible with a streptococcus-related pathogenesis for at least a subgroup of patients with tic disorders.
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