T cells {CD4+ T lymphocyte} {helper T cell} can have cell-surface CD4-protein receptors {co-receptor}, which assist T-cell receptors. Helper T cells have T-cell receptors.
process
Helper T cells start disease-organism killing. Helper T cells secrete lymphokines, such as interleukin, interferon, colony-stimulating factor, and tumor necrosis factor. Lymphokines activate cytotoxic T cells, signal B cells to make antibodies, attract macrophages and platelets with chemotactic factor, multiply helper T cells, and multiply immune precursor cells.
regulatory T cells
5% to 10% of helper T cells have CD25 surface protein and Foxp3 transcription factor and inhibit autoreactive CD4+ T lymphocytes.
problems
CD4+ T lymphocytes can alter to cause multiple sclerosis, insulin-dependent diabetes of youth, and rheumatoid arthritis.
Biological Sciences>Zoology>Organ>Immune System>Cells>T Cell
4-Zoology-Organ-Immune System-Cells-T Cell
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Date Modified: 2022.0224