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Association between immune cells and urticaria: a bidirectional Mendelian randomization study.

Yongjun Chen1, Xuejie Chen2, Zhipeng Zhang3

  • 1Department of Dermatology, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Huangshi, China.

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|November 28, 2024
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Summary

This study reveals a two-way causal link between specific immune cells and urticaria (hives). Identifying these immune cell associations can guide the development of targeted urticaria therapies.

Keywords:
bidirectional Mendelian randomizationimmune cellsinstrumental variableslymphocytesurticaria

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Area of Science:

  • Immunology
  • Genetics
  • Dermatology

Background:

  • Urticaria (hives) involves mast cell activation and immune cell involvement, but direct causal links remain unclear.
  • Understanding the interplay between immune cells and urticaria is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the causal relationship between immune cell phenotypes and urticaria using a bidirectional Mendelian randomization approach.
  • To identify specific immune cell markers associated with increased or decreased urticaria risk.

Main Methods:

  • Utilized Genome-wide Association Study (GWAS) data to identify genetic variants associated with immune cells and urticaria.
  • Employed bidirectional Mendelian randomization (MR) analysis with instrumental variables (IVs).
  • Conducted sensitivity analyses (MR-Egger, scatter plots, funnel plots, leave-one-out) to ensure robustness.

Main Results:

  • Identified 31 immunophenotypes associated with urticaria risk (18 increasing, 13 decreasing).
  • Four immunophenotypes showed a strong causal relationship: HLA DR+ CD4+AC, CD45 on CD8br, and HLA DR on plasmacytoid dendritic cells (increased risk); CD8dim NKT %lymphocyte (protective).
  • Reverse MR analysis indicated a bidirectional effect between urticaria and CD8dim NKT %lymphocyte.

Conclusions:

  • Established a bidirectional causal relationship between specific immune cell phenotypes and urticaria.
  • Findings provide a basis for developing targeted urticaria therapies based on immune cell profiles.