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Isolation Protocol of Mouse Monocyte-derived Dendritic Cells and Their Subsequent In Vitro Activation with Tumor Immune Complexes
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Published on: May 31, 2018

Controlled release of CD200 inhibits inflammatory macrophages and chondrocyte catabolism

Shreedevi Kumar1, Folly M Patterson1,2, Tiffany Conklin1

  • 1J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA.

Npj Biomedical Innovations
|July 29, 2026
PubMed

Insights

Delivering CD200 via microparticles shifts macrophages to a regenerative state, reducing cartilage breakdown in osteoarthritis. This approach shows promise for intra-articular OA treatment.

Area of Science:

  • Immunology
  • Biomaterials Science
  • Orthopedics

Background:

  • Osteoarthritis (OA) involves pro-inflammatory macrophages driving cartilage degeneration.
  • The CD200:CD200R pathway regulates macrophage activation and is a potential therapeutic target.

Purpose of the Study:

  • To investigate if CD200 delivery to macrophages can alter their inflammatory profile towards regeneration.
  • To assess the impact of CD200 on chondrocyte catabolism in an OA context.

Main Methods:

  • CD200 protein was encapsulated in poly(lactide-co-glycolide) microparticles (MPs).
  • Murine bone marrow-derived macrophages were treated with CD200-loaded MPs.
  • Gene and protein expression of inflammatory and anti-inflammatory mediators were analyzed.
  • Chondrocytes were exposed to conditioned media from treated macrophages.

Main Results:

  • CD200 MP treatment decreased pro-inflammatory mediators (M1) and increased anti-inflammatory mediators (M2/M1/2).
  • Conditioned media from CD200 MP-treated M1 macrophages reduced chondrocyte expression of catabolic enzyme genes.
  • This study demonstrates CD200 delivery alters macrophage inflammatory cascades and paracrine signaling.

Conclusions:

  • CD200 delivery via microparticles effectively modulates macrophage phenotype from pro-inflammatory to pro-regenerative.
  • This strategy shows potential for reducing chondrocyte catabolism and offers a novel intra-articular treatment for osteoarthritis.

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