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TSLP and downstream molecules in experimental mouse allergic conjunctivitis.

Xiaofen Zheng1, Ping Ma, Cintia S de Paiva

  • 1Department of Ophthalmology, Baylor College of Medicine, Ocular Surface Center, Cullen Eye Institute, Houston, Texas 77030, USA.

Investigative Ophthalmology & Visual Science
|January 29, 2010
PubMed
Summary

Thymic stromal lymphopoietin (TSLP) produced by ocular surface cells drives allergic conjunctivitis by activating dendritic cells and promoting Th2 inflammation. This highlights TSLP as a key player in ocular allergies.

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Area of Science:

  • Immunology
  • Ophthalmology
  • Allergy Research

Background:

  • Ocular allergic inflammation, such as allergic conjunctivitis (AC), significantly impacts quality of life.
  • The precise molecular mechanisms initiating ocular allergic responses remain incompletely understood.
  • Thymic stromal lymphopoietin (TSLP) is a cytokine implicated in allergic diseases, but its role in the eye is less defined.

Purpose of the Study:

  • To investigate the role of TSLP and its downstream signaling molecules in the development of ocular allergic inflammation.
  • To utilize a short ragweed (SRW)-induced mouse model of allergic conjunctivitis (AC) to explore these mechanisms.
  • To identify the cellular sources and pathways involved in TSLP-mediated ocular allergy.

Main Methods:

  • Induction of allergic conjunctivitis in BALB/c mice using topical SRW challenges after sensitization.

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  • Gene expression analysis (RT-qPCR) of ocular tissues (cornea, conjunctiva) and lymph nodes for key inflammatory markers.
  • Immunohistochemical staining of whole eye cryosections to visualize immune cell infiltration and protein expression.
  • In vitro assessment of dendritic cell maturation using TSLP-conditioned media.

    • Main Results:

    • SRW challenge successfully induced AC-like symptoms in mice.
    • Significantly elevated TSLP mRNA and protein levels were observed in the corneal and conjunctival epithelia of AC mice.
    • Increased infiltration of CD11c(+) and OX40L(+) cells in the conjunctiva, with elevated expression of CD11c, TSLPR, and OX40L in ocular tissues and lymph nodes.
    • Evidence of CD4(+) Th2 cell infiltration, with increased IL-4, IL-5, IL-13, OX40, STAT6, and GATA3 expression in the ocular surface, particularly the conjunctiva.
    • TSLP promoted the maturation of immature dendritic cells in vitro.

    Conclusions:

    • Local mucosal epithelial cells, particularly in the ocular surface, are key initiators of allergic conjunctivitis.
    • Production of TSLP by these cells plays a critical role in initiating ocular allergic inflammation.
    • TSLP activates dendritic cells, leading to Th2 cell differentiation and subsequent allergic inflammation via the TSLP-TSLPR and OX40L-OX40 signaling pathways.