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Development of ocular mucin: scanning EM analysis
Abstract:
Ocular mucin (mucus) development in the mouse was examined using several different fixatives and scanning electron microscopy. One of the fixatives, a picric acid--paraformaldehyde-glutaraldehyde (PA-P-G) preparation which fixes mucin at the adult mouse corneal surface, first demonstrated mucin at the surface of the pup cornea and conjunctiva at postnatal day 10. The mucus was scant, strand-like as well as granular in morphology and did not form smooth patches as in the adult. Thus, mucin is present at the ocular surface well before the mouse eye opens (day 14-15). Its presence is essential to ensure tear film stability, corneal wettability and possibly to protect the eye from bacterial and viral insult.
Insights
Ocular mucin development begins before eye opening in mice, appearing by postnatal day 10. This early mucus is crucial for tear film stability and eye protection.
Area of Science:
- Ophthalmology
- Developmental Biology
- Microscopy
Background:
- Ocular surface mucins are vital for tear film stability and eye protection.
- Understanding the timeline of mucin development is key to addressing ocular surface disorders.
Purpose of the Study:
- To investigate the initial development and morphology of ocular mucin in mouse pups.
- To determine the presence of mucin before the mouse eye opens.
Main Methods:
- Utilized scanning electron microscopy for high-resolution imaging.
- Employed a picric acid-paraformaldehyde-glutaraldehyde (PA-P-G) fixative optimized for ocular mucin.
Main Results:
- Ocular mucin was detected on the cornea and conjunctiva of mouse pups by postnatal day 10.
- The early mucus exhibited scant, strand-like, and granular morphology, differing from adult patterns.
- Mucin presence precedes eye opening (postnatal day 14-15).
Conclusions:
- Ocular mucin is present on the surface of the developing mouse eye well before it opens.
- This early mucin is essential for maintaining tear film stability and corneal wettability.
- The presence of ocular mucin likely contributes to protecting the eye from microbial infections.