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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Related Experiment Video

Updated: Feb 19, 2026

Flow Cytometry Analysis of Immune Cell Subsets within the Murine Spleen, Bone Marrow, Lymph Nodes and Synovial Tissue in an Osteoarthritis Model
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Immune Contributions to Osteoarthritis.

Erika Barboza Prado Lopes1, Adrian Filiberti2, Syed Ali Husain2

  • 1Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA.

Current Osteoporosis Reports
|November 4, 2017
PubMed
Summary

Low-grade inflammation, including synovitis and immune cell activity, is central to osteoarthritis (OA) development. Targeting these inflammatory pathways may lead to new disease-modifying osteoarthritis drugs (DMOADs).

Keywords:
ChemokinesMacrophagesOsteoarthritisSynovitisT cells

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Area of Science:

  • Immunology
  • Rheumatology
  • Pathophysiology

Background:

  • Osteoarthritis (OA) is increasingly understood to involve low-grade inflammation.
  • Synovitis, complement activation, cytokines, and immune cells are implicated in OA pathogenesis.

Purpose of the Study:

  • To review and discuss the role of inflammatory components in osteoarthritis.
  • To explore the contribution of synovitis, complement, cytokines, and immune cells to OA.

Main Methods:

  • Literature review and discussion of existing evidence.
  • Analysis of findings from newer imaging modalities and immune cell studies.

Main Results:

  • Synovitis is prevalent in OA knees, often detected by advanced imaging.
  • Complement activation and pro-inflammatory cytokines contribute significantly to cartilage damage and synovitis.
  • Immune cell infiltration, including T cells and macrophages, correlates with OA progression and pain.

Conclusions:

  • The innate and acquired immune systems are key players in OA-associated inflammation.
  • Inflammatory pathways in OA represent potential targets for novel disease-modifying osteoarthritis drugs (DMOADs).