What happens to immune system function when regulatory T cells fail in the thymus during negative selection?

💡 Explanation

When regulatory T cells fail to develop in the thymus due to defects in negative selection, self-reactive T cells are not suppressed and escape into circulation, leading to autoimmune reactions, because central tolerance is lost; therefore, autoimmunity increases, rather than being contained by regulatory mechanisms.

• If a marathon runner experiences muscle fatigue primarily in their quadriceps toward the end of a race despite adequate hydration, which process is most likely responsible?
• Why does rheumatoid arthritis develop after some infections trigger antibody production that targets both the pathogen and joint tissues?
• Why does peripheral tissue hypothyroidism persist despite normal TSH levels and thyroid hormone production following an autoimmune attack on deiodinase enzymes?
• If a marathon runner experiences prolonged, intense exercise, which consequence concerning muscle function is most likely?
• Why does the proteasome system become less effective at protein aggregate clearance with aging in neurons?
• If a patient consistently excretes highly concentrated urine with elevated calcium and oxalate levels, but does *not* develop kidney stones, which mechanism is most likely protecting them?