Abstract
We investigated the evidence for an infectious etiology of Kawasaki disease (KD), an acute vasculitis of unknown etiology, by assessing the effects of KD on the T cell antigen receptor variable beta region families (V beta). Using 3-color flow cytometry, we studied KD patients pre- and post-intravenous gamma globulin (IVIG) therapy and at > 40 days post therapy, additionally comparing them to matched pediatric control patients (PCC) and their own healthy parents (one parent/KD child). Of all the V beta families examined, only V beta 2 exhibited statistically significant differences, between the pre- and post-IVIG samples and preIVIG and parent samples. No associations were found between V beta 2 findings and T cell memory, activation, or adhesion markers. For 2 KD patients, 4 parents, and 1 PCC participant, > 15% of resting CD8+ lymphocytes and > 15% of blastic CD8+ lymphocytes expressed a single V beta family, which varied by individual, without similar expansions in the CD4+ cell populations. One of the participants with this abnormality was the only one with significant cardiac abnormalities. For all participants with the V beta abnormality, other T-cell abnormalities were extensive and involved both CD4+ and CD8+ cells. We ...Continue Reading
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