Inverse Correlation of TRIM32 and Protein Kinase C ζ in T Helper Type 2-Biased Inflammation
Zhiping Wang1, Yeon Jung Yoo1, Rachel De La Torre1
1Department of Dermatology, Oregon Health & Science University, Portland, Oregon, USA.
The Journal of Investigative Dermatology
|October 23, 2020
Summary
TRIM32 deficiency enhances T helper 2 (Th2) cell differentiation, a key factor in atopic dermatitis (AD). TRIM32 regulates protein kinase C zeta (PKCζ) stability, impacting Th2 cell development and AD pathogenesis.
Area of Science:
- Immunology
- Dermatology
- Molecular Biology
Background:
- Atopic dermatitis (AD) is characterized by T helper 2 (Th2) cell-driven inflammation.
- TRIM32, an E3 ubiquitin ligase, has been previously linked to AD and Th2-biased skin inflammation.
- The precise role of TRIM32 in regulating Th2 cell differentiation in AD remains to be fully elucidated.
Purpose of the Study:
- To investigate the role of TRIM32 in Th2 cell differentiation.
- To identify TRIM32-interacting proteins involved in Th2 signaling.
- To determine the therapeutic potential of targeting the TRIM32-PKCζ axis in AD.
Main Methods:
- In vitro studies assessing Th2 cell differentiation in Trim32-deficient settings.
- Bioinformatic analysis to identify TRIM32-associated proteins.
- In vivo studies using Prkcz null mice in an AD model.
- Analysis of TRIM32 and PKCζ expression in human AD skin samples.
Main Results:
- TRIM32 deficiency promotes Th2 cell differentiation in vitro.
- Protein kinase C zeta (PKCζ) was identified as a TRIM32-ubiquitinated protein, with its stability increased in Trim32 null Th2 cells.
- Prkcz null mice exhibited reduced AD-like phenotypes.
- A high PKCζ/TRIM32 ratio was observed in CD4+ cells from human AD skin.
Conclusions:
- TRIM32 acts as a negative regulator of PKCζ stability, thereby controlling Th2 cell differentiation.
- The TRIM32-PKCζ axis is a critical regulator of Th2 cell differentiation and plays a significant role in atopic dermatitis pathogenesis.
- Targeting this pathway may offer novel therapeutic strategies for AD.
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