A type of T cell that activates other immune cells, including B cells and cytotoxic T cells.
also known as CD4 T-cells or helper CD4 T-cells. These are cells that can help B cells make antibody in response to challenge. The most efficient helper cells are also known as Th2, cells that make the cytokines IL-4 and IL-5. Some experts refer to all CD4 cells as helper cells, regardless of function. Function determination requires cellular assays that show that some CD4 T cells kill the cells they interact with, and therefore not all CD4 cells are helper cells.
Type of white blood cell. Helper T cells stimulate B cells to make antibodies as part of the immune response.
See CD4 (T4) or CD4+ Cells.
See helper cells.
Lymphocytes developed in the thymus that stimulate the growth, differentiation, and immune response of B cells.
lymphocytes that bind B cells if they recognise a foreign particle on the B cells' surface.
components of the human immune system and the target cells of HIV
a group of T cells help produce antibodies, activate killer T cells, and make sure the immune system works smoothly.
A type of lymphocyte that stimulates the production of antibodies by activating B cells when an antigen is present.
white blood cells, responsible for regulating other cells in the body's immune system, that are the main targets of the AIDS virus; also called CD4 cells
T cells that participate in the activation of B cells and of other T cells; targets of the HIV-I virus, the agent of AIDS. (Contrast with cytotoxic T cells, suppressor T cells.)
a subset of T cells that carry the CD4 protein and increase immune responses by the secretion of specialized factors, the cytokines, that activate other white blood cells to fight off infection.
Lymphocytes bearing the CD4 marker that are responsible for many immune system functions, including turning antibody production on or off.
T lymphocytes that have a major role in assisting other lymphocytes, known as B cells, to produce antibody against an antigen.
A subset of T cells that typically carry the T4 marker and are essential for turning on antibody production, activating cytotoxic T cells, and initiating many other immune responses.
A class of T cells which help trigger B cells to make antibody against thymus-dependent antigens. Helper T cells also help generate cytotoxic T cells.
T cells that are essential for many immune responses. CTL and B cells functioning in cooperation with T helper cells have the CD4 antigen
T cells that recognize foreign substances in the body and initiate a response against them.
Lymphocytes whose secretions and other activities coordinate cell-mediated and antibody-mediated immunities; also called TH cells.