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Impact of Lacrimal Gland Extraction on the Contralateral Eye in an Animal Model for Dry Eye Disease

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Purpose: Although there is still no consensus on the best animal model for dry eye disease research, a model based on lacrimalgland extraction (LGE) model is widely used. In this study, we aimed to investigate the histopathological changes takingplace on the contralateral eye after unilateral LGE to determine whether it is useful as a control. Methods: Seven-week-old male C57BL/6 mice were divided into naive control, environmental chamber model, and LGEgroups. Corneal fluorescein staining was scored to quantify the severity of damage. Morphological changes in the cornea,conjunctiva, and lacrimal gland (LG) were determined by hematoxylin and eosin staining and compared to those on naive controlanimals. Results: Compared to naive subjects, the unilateral LGE model showed enhanced corneal erosion scores and loss of conjunctivalgoblet cells, not only on the ipsilateral but also on the contralateral side. These changes in the ocular surface becamemore pronounced in a time-dependent manner. Furthermore, loss of LG acinar cells and leukocyte infiltration were detectedin the contralateral LGs of the LGE model. Conclusions: Considering the changes observed in the ocular surface and LGs, the contralateral side of the LGE model maynot offer proper control conditions for the experimental comparison of the effects of dry eye disease in vivo. There may beregulatory feedback or crosstalk system between both eyes activated in response to LGE.

Abstract

Purpose: Although there is still no consensus on the best animal model for dry eye disease research, a model based on lacrimalgland extraction (LGE) model is widely used. In this study, we aimed to investigate the histopathological changes takingplace on the contralateral eye after unilateral LGE to determine whether it is useful as a control. Methods: Seven-week-old male C57BL/6 mice were divided into naive control, environmental chamber model, and LGEgroups. Corneal fluorescein staining was scored to quantify the severity of damage. Morphological changes in the cornea,conjunctiva, and lacrimal gland (LG) were determined by hematoxylin and eosin staining and compared to those on naive controlanimals. Results: Compared to naive subjects, the unilateral LGE model showed enhanced corneal erosion scores and loss of conjunctivalgoblet cells, not only on the ipsilateral but also on the contralateral side. These changes in the ocular surface becamemore pronounced in a time-dependent manner. Furthermore, loss of LG acinar cells and leukocyte infiltration were detectedin the contralateral LGs of the LGE model. Conclusions: Considering the changes observed in the ocular surface and LGs, the contralateral side of the LGE model maynot offer proper control conditions for the experimental comparison of the effects of dry eye disease in vivo. There may beregulatory feedback or crosstalk system between both eyes activated in response to LGE.

참고문헌 (38)

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