[Non-Invasive Diagnosis of Ocular Graft-versus-Host Disease]

A semifluorinated alkane (F4H5) as novel carrier for cyclosporine A: a promising therapeutic and prophylactic option for topical treatment of dry eye

Purpose

Cyclosporine A (Cs) has been used as effective topical therapy for inflammatory dry eye disease since more than a decade. However, due to its lipophilic character, Cs is formulated as emulsions or oily solutions for topical application. This experimental study aimed to test if the use of semifluorinated alkanes (SFAs) as a preservative-free, well-tolerated non-stinging or burning vehicle maintains or even improves the benefits of Cs in the topical therapy of dry-eye disease.

Methods

Desiccating stress was applied to C57BL/6 mice for 14 consecutive days to induce experimental dry-eye. Cs dissolved in SFA (perfluorobutylpentane = F4H5with 0.5% Ethanol), F4H5 with 0.5% ethanol only, 0.05% Cs (Restasis®), and dexamethasone (Monodex®) were applied three times daily beginning either at day 4 or day 11 of desiccating stress for up to 3 weeks after end of dry-eye induction.

Results

In comparison to other groups, Cs/F4H5 demonstrated high efficacy and earlier reduction of corneal staining. In this study, Cs/F4H5 had the ability to maintain conjunctival goblet cell density once applied on day 4. Flow cytometry analysis from cervical lymphnodes demonstrated a significantly lower CD4+ and CD8+ T-cells in the Cs/F4H5 group following 3 weeks of therapy than at baseline, but no difference in regulatory T cells from regional lymphnodes were seen.

Conclusions

Overall, compared to a commercially available Cs formulation (Restasis®) and dexamethasone, Cs/F4H5 was shown to be equally effective but with a significantly faster therapeutic response in reducing signs of dry-eye disease in an experimental mouse model.

[Ocular graft-versus-host disease]

Ocular graft-versus-host disease (GvHD) is predominantly an inflammatory ocular surface disorder after allogeneic hematopoietic stem cell transplantation (HSCT) with increasing incidence. It is not only associated with reduced quality of life because of dry eye syndromes but can also impair visual acuity and lead to blindness due to corneal complications. The GvHD is mostly associated with severe moisturizing disorder of the ocular surface, which is often resistant to therapy and accompanied by chronic inflammation. Corneal complications are an important problem in these patients. An individually adapted multimodal stage-related and interdisciplinary therapy in cooperation with hematologists and oncologists is therefore important for the treatment of patients with ocular GvHD.