Ageing of T-dependent B cell responses

Area of Science:

• Immunology
• Aging Research
• Cellular Biology

Background:

• The human immune system constantly interacts with environmental factors, influencing its efficiency.
• Immune function declines with age due to cellular senescence, a process known as immunosenescence.
• Immunosenescence affects T and B cells, diminishing responses to vaccines and pathogens.

Purpose of the Study:

• To review age-related changes in follicular helper (Tfh) and follicular regulatory (Tfr) T cells.
• To examine the impact of these changes on B cell immunity and germinal center (GC) function.
• To understand how these alterations shape the immune response in the elderly.

Main Methods:

• Review of existing literature on immunosenescence, Tfh, Tfr cells, and germinal centers.
• Analysis of age-related alterations in T cell subsets within lymphoid structures.
• Synthesis of data on the functional consequences for B cell maturation and antibody production.

Main Results:

• Age-related changes significantly affect Tfh and Tfr cell populations and function.
• These alterations impair the regulation and efficiency of germinal centers.
• Reduced Tfh/Tfr cell efficacy compromises B cell affinity maturation and overall adaptive immunity.

Conclusions:

• Age-induced modifications in Tfh and Tfr cells are critical drivers of immunosenescence.
• Understanding these changes is key to improving vaccine efficacy and managing infectious diseases in older populations.
• Targeting Tfh and Tfr cell pathways may offer strategies to rejuvenate immune responses in aging individuals.