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Novel Protocol for Generating Physiologic Immunogenic Dendritic Cells
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Integrin-driven monocyte to dendritic cell conversion in modified extracorporeal photochemotherapy.

A L Gonzalez1, C L Berger, J Remington

  • 1Department of Biomedical Engineering, Yale University, New Haven, Connecticut, USA.

Clinical and Experimental Immunology
|November 6, 2013
PubMed
Summary

Extracorporeal photochemotherapy (ECP) enhances monocyte-to-dendritic cell (DC) differentiation through plasma protein adsorption and integrin signaling. This discovery offers a new mechanism to potentially improve ECP treatment for conditions like CTCL and GVHD.

Keywords:
DCintegrinsmonocytetransimmunization

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Extracorporeal photochemotherapy (ECP) is a standard treatment for cutaneous T cell lymphoma (CTCL) and graft-versus-host disease (GVHD).
  • The precise cellular mechanisms underlying ECP's efficacy, particularly its role in dendritic cell (DC) modulation, remain incompletely understood.
  • ECP's ability to induce antigen-presenting cell (DC)-mediated immune responses suggests involvement of cell signaling pathways.

Purpose of the Study:

  • To investigate the role of integrin signaling and adsorbed plasma proteins in monocyte-to-DC differentiation during ECP.
  • To elucidate the specific molecular mechanisms by which ECP influences immune cell differentiation.

Main Methods:

  • Utilized two model systems of ECP to analyze monocyte-to-DC differentiation.
  • Examined the adhesion of monocytes to plasma proteins (fibronectin) adsorbed onto ECP plates.
  • Assessed DC differentiation markers (CD80, CD86, CD36, HLA-DR, CD83) and integrin signaling pathways (RGD motif, αVβ3, α5β1).

Main Results:

  • Monocytes adhered to adsorbed plasma proteins on ECP plates, initiating signaling pathways for differentiation.
  • Plasma protein adsorption significantly enhanced monocyte-to-DC differentiation (54.2% ± 4.7%), with fibronectin alone supporting 29.8% ± 7.2%.
  • The arginine-glycine-aspartic (RGD) motif in plasma proteins drove differentiation via αVβ3 and α5β1 integrin signaling, with high-density RGD substrates yielding 54.1% ± 5.8% differentiation.

Conclusions:

  • Plasma protein binding via integrins is a key mechanism driving monocyte-to-DC differentiation in ECP.
  • Specific binding domains of plasma proteins and integrins are crucial for this process.
  • Understanding this mechanism offers potential strategies to enhance the therapeutic efficacy of ECP.