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Related Experiment Videos

CD40 expression by gingival fibroblasts: correlation of phenotype with function

A I Dongari-Bagtzoglou1, W D Warren, M T Berton

  • 1Division of Periodontics, School of Dental and Oral Surgery, Columbia University, New York 10032, USA.

International Immunology
|October 6, 1997
PubMed
Summary

High CD40 expression on gingival fibroblasts correlates with increased secretion of inflammatory cytokines like IL-6 and IL-8. Activating CD40 further up-regulates this cytokine release, suggesting a key role for CD40 in fibroblast-mediated inflammation.

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Area of Science:

  • Immunology
  • Cell Biology
  • Oral Biology

Background:

  • CD40, a receptor from the tumor necrosis factor-alpha family, is expressed on various cell types, including fibroblasts.
  • CD40 signaling influences inflammatory cytokine secretion.
  • Fibroblast subsets exhibit diverse cytokine secretion profiles.

Purpose of the Study:

  • To investigate the relationship between CD40 expression and inflammatory cytokine secretion in gingival fibroblasts (GF).
  • To determine if differential CD40 expression on GF subpopulations dictates cytokine secretion.
  • To explore the functional impact of CD40 ligation on GF cytokine production.

Main Methods:

  • Analysis of CD40 expression levels in multiple gingival fibroblast cultures.
  • Quantification of interleukin-6 (IL-6) and interleukin-8 (IL-8) secreting cells.

Related Experiment Videos

  • In vitro stimulation of gingival fibroblasts via CD40 ligation.

    • Main Results:

    • A strong correlation was observed between the frequency of IL-6 and IL-8 secreting cells and the prevalence of high CD40-expressing cells in GF cultures.
    • Ligation of CD40 on gingival fibroblasts, particularly CD40-positive subsets, significantly enhanced the secretion of IL-6 and IL-8.
    • These findings indicate a direct functional link between CD40 expression and inflammatory cytokine release.

    Conclusions:

    • Gingival fibroblast subpopulations with high CD40 expression are associated with increased secretion of IL-6 and IL-8.
    • CD40 signaling plays a crucial role in regulating inflammatory cytokine production by gingival fibroblasts.
    • Targeting CD40 may represent a therapeutic strategy for managing inflammatory conditions involving gingival fibroblasts.