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Author Spotlight: Achieving High-Purity In Vitro Differentiation of Th17 Cells Using Cytokine Concentration Modulation
Published on: October 25, 2024
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Sterol metabolism controls T(H)17 differentiation by generating endogenous RORγ agonists
Xiao Hu1, Yahong Wang1, Ling-Yang Hao1
1Lycera Corp, Ann Arbor, Michigan, USA.
Nature Chemical Biology
|January 7, 2015
Summary
Cholesterol metabolism fuels TH17 cell differentiation, a key player in autoimmune diseases. This process generates desmosterol, activating the RORγt receptor essential for TH17 cell development.
Area of Science:
- Immunology
- Cell Biology
- Metabolic Pathways
Background:
- Retinoic acid receptor-related orphan receptor gamma (RORγt) is crucial for T helper 17 (TH17) cell differentiation.
- TH17 cells play a significant role in the pathogenesis of autoimmune diseases.
- The metabolic regulation of TH17 differentiation is not fully understood.
Purpose of the Study:
- To investigate the role of cholesterol metabolism in TH17 cell differentiation.
- To identify endogenous ligands that modulate RORγt activity during TH17 differentiation.
Main Methods:
- Analysis of gene expression related to cholesterol pathways during TH17 differentiation.
- Measurement of sterol levels in differentiating TH17 cells.
- Pharmacological inhibition of cholesterol synthesis pathways.
- Assessment of RORγt and LXR receptor activity.
Main Results:
- TH17 differentiation induces cholesterol biosynthesis and uptake while suppressing metabolism and efflux.
- Accumulation of desmosterol, a potent RORγt agonist, occurs during TH17 differentiation.
- Inhibition of cholesterol synthesis prior to desmosterol formation impairs TH17 differentiation.
- Sterol-sulfate conjugates are produced, favoring RORγt activation over LXR inhibition.
Conclusions:
- TH17 differentiation is tightly regulated by coordinated changes in sterol synthesis, mobilization, and metabolism.
- Desmosterol and specific sterol-sulfates act as endogenous agonists that selectively activate RORγt.
- Targeting cholesterol metabolism presents a potential therapeutic strategy for autoimmune diseases.
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