Sensory neurons regulate stimulus-dependent humoral immunity

Area of Science:

• Neuroimmunology
• Pulmonary Immunology

Background:

• Sensory neurons inform immune responses, primarily innate immunity.
• Humoral memory is established early, influencing later immune outcomes.
• The role of sensory neurons in lung humoral immunity is not fully defined.

Purpose of the Study:

• To investigate sensory neuron influence on B-cell and antibody responses in the lung.
• To determine the role of specific sensory neuropeptides in bacterial infection and allergic asthma.

Main Methods:

• Murine models of Streptococcus pneumoniae infection and allergic asthma.
• Sensory neuron depletion and neuropeptide administration/ablation.
• Analysis of B-cell populations, antibody production (IgG, IgE), and immune cell recruitment.

Main Results:

• Sensory neuron depletion worsened S. pneumoniae infection (increased bacterial burden) and reduced IgG production.
• Sensory neuron depletion ameliorated allergic asthma (reduced IgE and inflammation).
• Vasoactive intestinal polypeptide (VIP) was key in bacterial infection, while substance P was involved in asthma.

Conclusions:

• Sensory neurons differentially regulate humoral immunity in the lung based on the immunogen.
• Specific neuropeptides (VIP, substance P) released by sensory neurons target B-cells.
• Targeting sensory neurons offers a potential therapeutic strategy for humoral immune disorders.