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Goblet cell loss abrogates ocular surface immune tolerance.

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Area of Science:

  • Ophthalmology
  • Immunology
  • Cell Biology

Background:

  • Aqueous-deficient dry eye is linked to goblet cell (GC) loss and elevated IFN-γ in the conjunctiva.
  • Goblet cells are suspected to play a role in maintaining immune tolerance within the ocular surface environment.

Purpose of the Study:

  • To investigate the role of conjunctival goblet cells in regulating immune tolerance.
  • To determine if the loss of goblet cells affects the tolerogenic properties of antigen-presenting cells (APCs) in the conjunctiva and draining lymph nodes.

Main Methods:

  • Utilized mice lacking the Spdef transcription factor (Spdef-KO), which are deficient in goblet cell differentiation.
  • Analyzed the frequency and cytokine expression of immune cells (macrophages, dendritic cells) in the conjunctiva and draining lymph nodes.
  • Assessed the impact of conjunctival goblet cell conditioned media on APC function.
  • Evaluated T cell responses (proliferation, cytokine production, Foxp3 expression) after priming with APCs from Spdef-KO and WT mice.
  • Measured immune tolerance to topical OVA antigen using delayed-type hypersensitivity (DTH) reactions and T cell assays.

Main Results:

  • Spdef-KO mice exhibited increased conjunctival macrophages and CD11b+CD11c+ dendritic cells (DCs) with higher IL-12 expression compared to wild-type (WT) mice.
  • Conditioned media from WT GCs suppressed LPS-induced IL-12 production by conjunctival APCs.
  • T cells primed by Spdef-KO APCs showed enhanced proliferation, reduced Foxp3+ regulatory T cells, and increased IFN-γ and IL-17 production.
  • Immune tolerance to topical OVA antigen was abrogated in Spdef-KO mice, as evidenced by increased DTH, T cell proliferation, and IFN-γ production.

Conclusions:

  • Conjunctival goblet cells play a critical role in conditioning APCs to promote immune tolerance.
  • Goblet cells suppress IL-12 production by APCs, thereby inhibiting Th1 polarization and maintaining ocular immune homeostasis.
  • Loss of goblet cells disrupts immune tolerance, potentially contributing to inflammatory conditions like dry eye disease.