Journal
PLOS ONE
Volume 9, Issue 7, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0099328
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Funding
- Japan Society for the Promotion of Science [22791694]
- Johnson and Johnson Vision Care Company
- Grants-in-Aid for Scientific Research [22791694] Funding Source: KAKEN
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Purpose: The purpose of our study was to investigate alterations in the meibomian gland (MG) in Cu, Zn-Superoxide Dismutase-1 knockout (Sod1(-/-)) mouse. Methods: Tear function tests [Break up time (BUT) and cotton thread] and ocular vital staining test were performed on Sod1(-/-) male mice (n = 24) aged 10 and 50 weeks, and age and sex matched wild-type (+/+) mice (n = 25). Tear and serum samples were collected at sacrifice for inflammatory cytokine assays. MG specimens underwent Hematoxylin and Eosin staining, Mallory staining for fibrosis, Oil Red O lipid staining, TUNEL staining, immunohistochemistry stainings for 4HNE, 8-OHdG and CD45. Transmission electron microscopic examination (TEM) was also performed. Results: Corneal vital staining scores in the Sod1(-/-) mice were significantly higher compared with the wild type mice throughout the follow-up. Tear and serum IL-6 and TNF-alpha levels also showed significant elevations in the 10 to 50 week Sod1(-/-) mice. Oil Red O staining showed an accumulation of large lipid droplets in the Sod1(-/-) mice at 50 weeks. Immunohistochemistry revealed both increased TUNEL and oxidative stress marker stainings of the MG acinar epithelium in the Sod1(-/-) mice compared to the wild type mice. Immunohistochemistry staining for CD45 showed increasing inflammatory cell infiltrates from 10 to 50 weeks in the Sod1(-/-) mice compared to the wild type mice. TEM revealed prominent mitochondrial changes in 50 week Sod1(-/-) mice. Conclusions: Our results suggest that reactive oxygen species might play a vital role in the pathogensis of meibomian gland dysfunction. The Sod1(-/-) mouse appears to be a promising model for the study of reactive oxygen species associated MG alterations.
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