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Updated: Jul 2, 2026
12:21
Thermostabilization, Expression, Purification, and Crystallization of the Human Serotonin Transporter Bound to S-citalopram
Published on: November 27, 2016
Serotonin Degradation and Lipid Metabolism Regulate Human Tc2 Cell Effector Functions
Sabrina de Souza Ferreira1,2, Lisa Holla1, Sophia Björkander3
1Centre for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden.
Allergy
|July 1, 2026
Summary
Cytotoxic type 2 T cells (Tc2) require lipid metabolism and serotonin breakdown for cytokine production. Serotonin-modifying drugs may reduce allergic sensitization by altering Tc2 cell function.
Area of Science:
- Immunology
- Metabolic pathways
- Type 2 inflammation
Background:
- Cytotoxic type 2 T cells (Tc2) contribute to type 2 inflammation, such as asthma.
- The metabolic requirements supporting Tc2 cell function are not well understood.
- This study investigated Tc2 cell metabolism and the impact of serotonin pathways on allergic responses.
Purpose of the Study:
- To define the metabolic needs of Tc2 cells.
- To identify pathways regulating Tc2 effector functions.
- To examine the association between serotonin-modifying therapies, Tc2 responses, and allergic sensitization in humans.
Main Methods:
- Analysis of human Tc2 cells using Seahorse assays, flow cytometry, and RNA sequencing.
- Evaluation of effector functions after inhibiting glycolysis, fatty acid metabolism, and monoamine oxidase A (MAOA).
- Assessment of anti-depressant prescription data and ex vivo Tc2 cell responses in individuals on SSRIs.
Main Results:
- Tc2 cells show high mitochondrial respiration, glycolysis, and express GLUT1 and CD36.
- Type 2 cytokine production is dependent on glycolysis, fatty acid metabolism, and PPARγ.
- MAOA inhibition selectively reduced type 2 cytokines; SSRI use correlated with reduced allergic sensitization and altered Tc2 cytokine profiles.
Conclusions:
- Tc2 cell function relies on coordinated lipid metabolism and serotonin catabolism.
- Serotonin-modifying therapies are linked to decreased allergic sensitization and modified Tc2 cell activity in humans.
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