B Cells Promote T Cell Immunosenescence and Mammalian Aging Parameters

Area of Science:

• Immunology
• Gerontology
• Cell Biology

Background:

• Adaptive immune system dysregulation is a hallmark of aging, linked to chronic diseases and mortality.
• Aging involves reduced T cell diversity and expanded inflammatory T cell subsets, with underlying causes unclear.
• Understanding drivers of immune aging is crucial for managing age-related health decline.

Approach:

• Investigated B cell influence on T cell aging using B cell manipulation models.
• Employed single-cell omics to analyze cellular changes during aging.
• Examined the role of insulin receptor signaling in B cell-mediated immune aging.

Key Points:

• B cells significantly contribute to the age-related decline in naive T cells and T cell receptor diversity.
• B cells promote the differentiation of T cells into pathogenic, immunosenescent subsets.
• Therapeutic targeting of B cells, such as with CD20 monoclonal antibodies, can reverse these age-related immune shifts.
• Insulin receptor signaling in B cells plays a key mechanistic role in T cell dysfunction and reduced healthspan.

Conclusions:

• B cells are pivotal in driving age-associated adaptive immune dysfunction.
• Modulating B cell activity offers a therapeutic strategy to combat immune aging and improve healthspan.
• These findings open new avenues for managing age-related diseases and multi-morbidity.