Toll-Like Receptors in Adaptive Immunity

Area of Science:

• Immunology
• Molecular Biology
• Cell Biology

Background:

• The immune system protects against external and internal dangers using innate and adaptive responses.
• Pattern recognition receptors (PRRs), like Toll-like receptors (TLRs), detect danger signals (PAMPs/MAMPs and DAMPs) to initiate immune responses.
• TLRs were initially recognized for their role in innate immunity but are also expressed on adaptive immune cells.

Purpose of the Study:

• To introduce the evolution of innate and adaptive immunity and TLRs.
• To describe the role of TLRs in innate immune function and inflammation.
• To detail the expression and function of TLRs on human and murine adaptive immune cells (T and B cells).

Main Methods:

• Literature review and synthesis of existing research on TLRs and immune system evolution.
• Analysis of TLR expression patterns and signaling pathways in innate and adaptive immune cells.
• Exploration of the therapeutic potential of TLR modulation.

Main Results:

• TLRs are crucial PRRs that link innate and adaptive immunity.
• TLRs are expressed on various adaptive immune cells, including different T cell subsets and B cells.
• The study outlines the evolutionary timeline of TLRs and the adaptive immune system.

Conclusions:

• Modulating TLRs on T and B cells holds significant promise for developing novel vaccine candidates and immunotherapies.
• Targeting TLRs can address challenges in treating microbial infections, cancers, and autoimmune/autoinflammatory diseases.
• Understanding TLRs' dual role in innate and adaptive immunity is vital for future therapeutic strategies.