Nerve-driven immunity. The direct effects of neurotransmitters on T-cell function

Area of Science:

• Neuroimmunology
• Cellular Immunology
• Molecular Pharmacology

Background:

• The interaction between the nervous and immune systems is complex.
• T-cell functions are crucial for adaptive immunity.
• The direct impact of neurotransmitters on T cells remains largely unexplored.

Purpose of the Study:

• To investigate direct neurotransmitter interactions with T-cell receptors.
• To determine the effects of neurotransmitters on T-cell functions like cytokine secretion, proliferation, and adhesion.
• To elucidate the signaling pathways involved in these interactions.

Main Methods:

• Exposure of human and mouse T cells to neurotransmitters (somatostatin, CGRP, NPY, dopamine, substance P) in vitro.
• Assessment of T-cell functions including cytokine secretion, proliferation, and integrin-mediated adhesion/migration.
• Utilized receptor antagonists to confirm specific receptor-mediated effects.

Main Results:

• Somatostatin, CGRP, NPY, and dopamine directly activated T-cell beta 1 integrins, promoting adhesion.
• Substance P inhibited integrin-mediated T-cell adhesion.
• Neurotransmitters modulated the secretion of both typical and atypical cytokines by T cells.

Conclusions:

• Neurotransmitters directly bind to T-cell surface receptors, delivering either activating or inhibitory signals.
• These interactions significantly impact T-cell adhesion, migration, and cytokine profiles.
• Neurotransmitters play a critical, previously unrecognized role in modulating T-cell functions in health and disease.