September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Carrageenan - a natural inhibitor of ocular chlamydial infection in vitro and in vivo
Author Affiliations & Notes
  • Nadine Schuerer
    OCUVAC - Laura Bassi, Center for Pathophysiology, Infectiology and Immunology, Medical University Vienna, Vienna, Austria
  • Elisabeth Stein
    OCUVAC - Laura Bassi, Center for Pathophysiology, Infectiology and Immunology, Medical University Vienna, Vienna, Austria
  • Aleksandra Inic-Kanada
    OCUVAC - Laura Bassi, Center for Pathophysiology, Infectiology and Immunology, Medical University Vienna, Vienna, Austria
  • Sandra Belij
    OCUVAC - Laura Bassi, Center for Pathophysiology, Infectiology and Immunology, Medical University Vienna, Vienna, Austria
  • Marijana Stojanovic
    Department of Research and Development, Institute of Virology, Vaccines and Sera – TORLAK, Belgrade, Serbia
  • Jacqueline Montanaro
    OCUVAC - Laura Bassi, Center for Pathophysiology, Infectiology and Immunology, Medical University Vienna, Vienna, Austria
  • Ehsan Ghasemian
    OCUVAC - Laura Bassi, Center for Pathophysiology, Infectiology and Immunology, Medical University Vienna, Vienna, Austria
  • Emilija Marinkovic
    Department of Research and Development, Institute of Virology, Vaccines and Sera – TORLAK, Belgrade, Serbia
  • Ana Filipovic
    Department of Research and Development, Institute of Virology, Vaccines and Sera – TORLAK, Belgrade, Serbia
  • Talin Barisani-Asenbauer
    OCUVAC - Laura Bassi, Center for Pathophysiology, Infectiology and Immunology, Medical University Vienna, Vienna, Austria
  • Footnotes
    Commercial Relationships   Nadine Schuerer, None; Elisabeth Stein, None; Aleksandra Inic-Kanada, None; Sandra Belij, None; Marijana Stojanovic, None; Jacqueline Montanaro, None; Ehsan Ghasemian, None; Emilija Marinkovic, None; Ana Filipovic, None; Talin Barisani-Asenbauer, None
  • Footnotes
    Support  Laura Bassi FFG Project Number 822768
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 2352. doi:
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      Nadine Schuerer, Elisabeth Stein, Aleksandra Inic-Kanada, Sandra Belij, Marijana Stojanovic, Jacqueline Montanaro, Ehsan Ghasemian, Emilija Marinkovic, Ana Filipovic, Talin Barisani-Asenbauer; Carrageenan - a natural inhibitor of ocular chlamydial infection in vitro and in vivo
      . Invest. Ophthalmol. Vis. Sci. 2016;57(12):2352.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : Ocular infection with Chlamydia trachomatis (Ct) is the leading cause of infectious blindness. As Ct infects via extracellular elementary bodies (EB), we suggest that carrageenan, a natural extract from red seaweed that binds virus particles, might physically bind EB and thereby prevent their attachment to epithelial cells. We tested the hypothesis that carrageenan inhibits Ct infection in vitro using an experimental ocular infection model and in vivo using our guinea pig model.

Methods : Confluent monolayers of human conjunctival epithelial (HCjE) cells were inoculated with Ct serovar B in the presence or absence of carrageenan. Cells were cultured for 48 hours, then fixed and stained with α-Chlamydia LPS antibody and visualized with fluorescent microscopy. Hartley strain guinea pigs were treated either with placebo or with 0.06 mg per eye of carrageenan for 2h before infecting with 1x104 IFU of Chlamydia caviae (3 animals per group). The palpebral and bulbar conjunctivae were evaluated for erythema, edema, and exudation on days 4, 7, 14, and 21.

Results : HCjE cells treated with 1.2 mg/ml carrageenan showed minimal infection (mean of 326±10.94 IFU), with a 7-fold reduction compared to placebo treated cells (mean of 2403±89.47 IFU, p=0.001). In the guinea pigs the pathology score was significantly reduced in the group pre-treated with carrageenan at all time points (p=0.05).

Conclusions : Carrageenan reduced the absolute number of infected cells in vitro and the pathology in vivo, suggesting it should be investigated further as treatment and/or prophylaxis for Ct infection.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

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