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Updated: Nov 21, 2025

Lymphocyte Isolation from Human Skin for Phenotypic Analysis and Ex Vivo Cell Culture
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Tissue-Resident Memory CD8+ T Cells From Skin Differentiate Psoriatic Arthritis From Psoriasis.

Emmerik F Leijten1, Tessa S van Kempen1, Michel A Olde Nordkamp1

  • 1University Medical Center Utrecht, Utrecht, The Netherlands.

Arthritis & Rheumatology (Hoboken, N.J.)
|January 16, 2021
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Summary

Tissue-resident memory CD8+ T cells are increased in psoriatic arthritis (PsA) patients compared to psoriasis patients. These skin-derived cells may contribute to PsA pathogenesis by affecting cutaneous tissue homeostasis.

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Area of Science:

  • Immunology
  • Dermatology
  • Rheumatology

Background:

  • Psoriatic arthritis (PsA) and psoriasis share inflammatory pathways, but distinct immune cell profiles may underlie their differing clinical manifestations.
  • Understanding these differences is crucial for developing targeted therapies for PsA.

Purpose of the Study:

  • To compare immune cell phenotype and function in psoriatic arthritis (PsA) versus psoriasis.
  • To elucidate the specific immune cell populations that differentiate PsA from psoriasis.

Main Methods:

  • In-depth immunophenotyping of T cell and dendritic cell subsets in peripheral blood, synovial fluid, and skin biopsies.
  • Flow cytometry, high-throughput transcriptome analysis, and functional assays were employed.
  • Comparison was made between patients with PsA, psoriasis, axial spondyloarthritis, and healthy controls.

Main Results:

  • Peripheral blood in PsA showed increased regulatory CD4+ T cells and IL-17A/IL-22-producing CD8+ T cells compared to controls.
  • A specific CD8+CCR10+ T cell population, expressing skin-homing receptors and GATA3/FOXP3, was enriched in PsA patients.
  • These CD8+CCR10+ T cells exhibited a regulatory, Tc2/22-like cytokine profile and lacked cytotoxic potential.

Conclusions:

  • Tissue-resident memory CD8+ T cells originating from the skin are elevated in the circulation of PsA patients compared to psoriasis patients.
  • This finding suggests that disruptions in skin tissue homeostasis may play a role in the development of psoriatic arthritis.