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Modulation of conjunctival goblet cell function by inflammatory cytokines.

L Contreras-Ruiz1, A Ghosh-Mitra2, M A Shatos2

  • 1Department of Ophthalmology, Boston University School of Medicine, Boston, MA 02118, USA.

Mediators of Inflammation
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Inflammatory cytokines like TNF-α and IFN-γ induce goblet cell apoptosis and inhibit mucin secretion in Sjögren

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Area of Science:

  • Ophthalmology
  • Immunology
  • Cell Biology

Background:

  • Ocular surface inflammation in Sjögren's syndrome involves goblet cell dysfunction.
  • The precise impact of inflammatory cytokines on conjunctival goblet cell function is not well understood.

Purpose of the Study:

  • To investigate the effects of specific inflammatory cytokines on mouse conjunctival goblet cell function.
  • To elucidate the role of cytokines in Sjögren's syndrome-related ocular surface damage.

Main Methods:

  • Primary culture of mouse conjunctival goblet cells was established.
  • Goblet cell apoptosis, mucin secretion, and proliferation were assessed in response to various inflammatory cytokines (TNF-α, IFN-γ, IL-6, IL-13, IL-17).
  • Cytokine exposure was evaluated in goblet cells from Thrombospondin-1 deficient mice, a model for Sjögren's syndrome.

Main Results:

  • Tumor necrosis factor-alpha (TNF-α) and interferon-gamma (IFN-γ) were identified as primary inducers of goblet cell apoptosis.
  • TNF-α and IFN-γ inhibited cholinergic-stimulated mucin secretion, while interleukin-6 (IL-6) enhanced it.
  • Interleukin-13 (IL-13) and interleukin-17 (IL-17) did not significantly alter secretory responses.
  • All tested cytokines induced goblet cell proliferation, with IL-13 and IL-6 showing the most significant effects.

Conclusions:

  • Inflammatory cytokines directly impair conjunctival goblet cell function in ocular surface disease.
  • Disruption of goblet cell function compromises tear film integrity and contributes to ocular surface damage.
  • These findings highlight a key mechanism in Sjögren's syndrome pathogenesis.