Complementing T Cells' Functions: Bringing in Metabolism Matters.

Area of Science:

• Immunology
• Cellular Biology
• Metabolism

Background:

• The complement system is a crucial part of innate immunity.
• T cells, including conventional and regulatory subsets, play vital roles in immune responses.
• The direct interaction between complement components and T cells is an emerging area of research.

Purpose of the Study:

• To investigate the direct effects of complement system components on T cell subsets.
• To elucidate the molecular mechanisms by which complement influences T cell function and metabolism.
• To understand how complement signaling impacts mammalian target of rapamycin complex 1 (mTORC1) activation in T cells.

Main Methods:

• Analysis of T cell subsets in the presence of complement components.
• Assessment of mTORC1 pathway activation using biochemical assays.
• Investigation of cellular metabolic changes in T cells upon complement stimulation.

Main Results:

• Complement components directly modulate both conventional and regulatory T cell subsets.
• Complement stimulation leads to sustained activation of the mTORC1 pathway in T cells.
• This sustained mTORC1 activation by complement influences T cell cellular metabolism.

Conclusions:

• The complement system actively regulates T cell populations and function.
• Complement-mediated mTORC1 activation is a key mechanism controlling T cell metabolism.
• These findings reveal a novel link between innate immunity and adaptive immune cell function via metabolic regulation.