Why can T-cells sometimes attack the body’s own antigens?

• A. They are miscommunicating with B-cells
• B. The immune system remains activated after an infection
• C. Increased levels of antibodies
• D. Inactivity of regulatory T-cells

Answer: (B)

T-cells can sometimes attack the body’s own antigens due to the prolonged activation of the immune system after an infection. Normally, T-cells are activated in response to foreign pathogens, and once the infection is cleared, the immune response diminishes, and T-cells return to a resting state. However, if the immune system remains activated for an extended period, it may lead to a situation where the T-cells continue to react, mistakenly targeting the body's own tissues as if they were foreign invaders.

This persistent activation can be influenced by various factors, such as the presence of chronic infection or persistent inflammatory stimuli, which can keep the immune system in a heightened state of responsiveness. As a result, T-cells may begin to recognize self-antigens as threats, contributing to autoimmune responses.

The other factors listed, such as miscommunication between T-cells and B-cells, increased levels of antibodies, or inactivity of regulatory T-cells, while related to immune function, do not directly explain the phenomenon of T-cells attacking the body’s own antigens in the context of prolonged immune activation.