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Humoral and Cellular Immunity Changed after Traumatic Brain Injury in Human Patients.

Previous studies have suggested that there is a disproportionally higher risk of infection following traumatic brain injury (TBI). This predisposition to infection may be driven by a poorly understood, brain-specific response in the immune system after TBI. However, there is a lack of studies that have fully characterized TBI patients to understand the relationship between TBI and peripheral immune function. In the present study, markers for humoral immunity and cellular immunity were measured for up to 2 weeks in the peripheral blood of 37 patients with TBI in order to elucidate the time course and the type of the peripheral immune response following TBI. 12 relatively healthy individuals without TBI and other neurological diseases were enrolled into the control group. Our data indicated that TBI could induce significant changes in humoral immunity characterized by a decrease in IgG and IgM levels and an increase in the complements C3 and C4 levels in comparison with the control group. Moreover, compared with the control group, a significant reduction in peripheral blood CD3(+) and CD3(+)CD4(+) lymphocyte counts occurred early (days 1-3) following the onset of trauma. These results provide evidence that TBI is associated with substantial changes in humoral immunity and cellular immunity, which may explain the high incidence of infection encountered in these patients.

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