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  2. CD4+/CD8+ ratio - Wikipedia

    en.wikipedia.org/wiki/CD4+/CD8+_ratio

    A reduced CD4 + /CD8 + ratio is associated with reduced resistance to infection. [9]Patients with tuberculosis show a reduced CD4 + /CD8 + ratio. [9]HIV infection leads to low levels of CD4 + T cells (lowering the CD4 + /CD8 + ratio) through a number of mechanisms, including killing of infected CD4 +.

  3. Naive T cell - Wikipedia

    en.wikipedia.org/wiki/Naive_T_cell

    In immunology, a naive T cell (T h 0 cell) is a T cell that has differentiated in the thymus, and successfully undergone the positive and negative processes of central selection in the thymus. Among these are the naive forms of helper T cells ( CD4 + ) and cytotoxic T cells ( CD8 + ).

  4. T cell - Wikipedia

    en.wikipedia.org/wiki/T_cell

    T cells are grouped into a series of subsets based on their function. CD4 and CD8 T cells are selected in the thymus, but undergo further differentiation in the periphery to specialized cells which have different functions. T cell subsets were initially defined by function, but also have associated gene or protein expression patterns.

  5. T helper cell - Wikipedia

    en.wikipedia.org/wiki/T_helper_cell

    Their key effector cytokine is IL-10. Their main effector cells are NK cells as well as CD8 T cells, IgG B cells, and IL-10 CD4 T cells. The key THαβ transcription factors are STAT1 and STAT3 as well as IRFs. IL-10 from CD4 T cells activate NK cells' ADCC to apoptose virus-infected cells and to induce host as well as viral DNA fragmentation ...

  6. Priming (immunology) - Wikipedia

    en.wikipedia.org/wiki/Priming_(immunology)

    Priming of naive CD8 T cells generates cytotoxic T cells capable of directly killing pathogen-infected cells. CD4 cells develop into a diverse array of effector cell types depending on the nature of the signals they receive during priming. CD4 effector activity can include cytotoxicity, but more frequently it involves the secretion of a set of ...

  7. Helper/suppressor ratio - Wikipedia

    en.wikipedia.org/wiki/Helper/suppressor_ratio

    Normal values (95% confidence intervals) are approximately 30-60% CD4 and 10-30% CD8 depending on age (ratio 0.9 to 3.7 in adults). [1] One reason for abnormal results is the loss of CD4-positive cells to the human immunodeficiency virus (HIV) infection. The loss of CD4-positive cells to HIV infection can result in various distortions in the ...

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