The naive humoral immune response also decreases with age; B cells show impaired activation and proliferation, and antibody production is decreased in quantity and quality (i.e., less effective in preventing infection) (Castle, 2000). Diminished CD4
T cell support for B cell activation and differentiation is thought to be largely responsible for an age-related decline in antibody production to antigens (Miller, 1996). For instance, elderly individuals who exhibited a poor, rather than good, influenza vaccine response were also characterized by greater CD8 relative to CD4 clonal expansion
(Saurwein-Teissl et al., 2002), indicative of a low CD4: CD8 ratio. Further, the outcome of previous vaccination is a shorter duration T cell memory in older relative to young adults, consistent with the notion that memory T cell function diminishes with age (Miller, 1996).
The naive humoral immune response also decreases with age; B cells show impaired activation and proliferation, and antibody production is decreased in quantity and quality (i.e., less effective in preventing infection) (Castle, 2000). Diminished CD4T cell support for B cell activation and differentiation is thought to be largely responsible for an age-related decline in antibody production to antigens (Miller, 1996). For instance, elderly individuals who exhibited a poor, rather than good, influenza vaccine response were also characterized by greater CD8 relative to CD4 clonal expansion (Saurwein-Teissl et al., 2002), indicative of a low CD4: CD8 ratio. Further, the outcome of previous vaccination is a shorter duration T cell memory in older relative to young adults, consistent with the notion that memory T cell function diminishes with age (Miller, 1996).
การแปล กรุณารอสักครู่..
