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Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
Published on: April 16, 2015
Sensory neurons shape γδ T cell effector programs to control psoriasiform inflammation
Juan M Inclan-Rico1, Camila M Napuri2, Adriana Stephenson2
1Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA; Department of Neuroscience, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Sensory neurons, specifically NP1, can suppress psoriasis by reducing inflammatory cells. Conversely, NP2 activation worsens the condition, highlighting distinct roles for these nerve subsets in skin immunity.
Area of Science:
- Neuroimmunology
- Dermatology
- Immunology
Background:
- Psoriasis involves IL-17-producing γδ T cells (γδT17) and itch, but the role of sensory neurons is unclear.
- Non-peptidergic (NP) afferents, including NP1 and NP2 subsets, are implicated in itch signaling.
Purpose of the Study:
- Investigate the differential roles of MrgprD/NP1 and MrgprA3/NP2 sensory neuron subsets in psoriasis.
- Determine if activating or ablating these neuron subsets affects psoriasiform dermatitis.
Main Methods:
- Analyzed gene expression in human NP1 and NP2 neurons and psoriatic skin.
- Used imiquimod (IMQ)-induced mouse model of psoriasis.
- Manipulated NP1 and NP2 neuron activity via optogenetics and pharmacological agents (β-alanine).
- Assessed disease severity, epidermal thickness, and immune cell populations (γδT17, IL-13+, GATA3+, IL-10+).
Main Results:
- NP1 neuron ablation worsened IMQ-induced skin disease, while NP1 activation reduced severity and γδT17 cell accumulation.
- NP2 activation increased γδT17 cells, amphiregulin (Areg) expression, and exacerbated skin pathology.
- NP1 stimulation shifted γδ T cells towards an IL-13+ GATA3+ phenotype with IL-10 secretion.
- IL-10 signaling blockade reversed the protective effects of NP1 activation.
Conclusions:
- Distinct sensory neuron subsets (NP1 and NP2) differentially regulate psoriasiform immunopathology.
- NP1 activation suppresses inflammation and promotes an IL-10-mediated anti-inflammatory response.
- NP2 activation exacerbates inflammation via IL-17 and Areg pathways.
- Targeting specific sensory neuron subsets may offer novel therapeutic strategies for psoriasis.
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