Answer :
Helper T cells are an essential part of the immune system. They are responsible for activating other immune cells, secreting antibodies that mark foreign antigens for destruction, triggering an inflammatory response in allergic reactions, directly killing target cells, and suppressing immune reactions to prevent autoimmune diseases.
Helper T cells also play a role in allergic reactions. When the body is exposed to an allergen, the helper T cells will cause an inflammatory response, resulting in the production of histamine and other pro-inflammatory molecules. This inflammatory response causes the symptoms of an allergic reaction, such as sneezing, coughing, and itchy eyes.
In addition to these roles, helper T cells can also directly destroy target cells. This is done by secreting molecules such as perforin and granzymes, which are proteins that can break down the cell membrane of the target cell, effectively killing it. This is an important part of the immune response, as it can help eliminate infected cells before they have a chance to spread the infection to other cells.
Finally, helper T cells can also suppress immune reactions. This is done by secreting cytokines such as interleukin 10, which can reduce inflammation and prevent an overly aggressive immune response from occurring. This is important, as an overly aggressive immune response can cause damage to healthy cells and tissues, leading to autoimmune diseases such as rheumatoid arthritis and type 1 diabetes.
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