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Myelin-associated glycoprotein in the developing human retina
Abstract:
The immunohistochemical presence of myelin-associated glycoprotein (MAG) in Müller cells of the developing human retina was examined with rat monoclonal antibodies to MAG and the peroxidase antiperoxidase (PAP) method of Sternberger. Retinas of various developmental stages ranging between 9-31 gestational weeks were stained. There was no staining in the retinas of 9-12-week embryos. Between 13-16 gestational weeks the staining was faint and located mostly in the inner and middle portion of the retina, primarily around the optic nerve head. After midterm, Müller cells invariably stained through all retinal layers. The staining increased gradually up to the twenty-third gestational week, when it reached the level found in the retinas of newborn children.
Insights
Myelin-associated glycoprotein (MAG) presence in human Müller cells was studied during retinal development. MAG staining in Müller cells appears after 13 weeks and increases significantly by 23 weeks of gestation.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- Müller cells are the principal glial cells of the vertebrate retina.
- Myelin-associated glycoprotein (MAG) is a key component of myelin sheaths.
- The role of MAG in retinal development is not fully understood.
Purpose of the Study:
- To investigate the temporal and spatial expression of myelin-associated glycoprotein (MAG) in Müller cells during human retinal development.
Main Methods:
- Immunohistochemistry using rat monoclonal antibodies to MAG.
- Peroxidase antiperoxidase (PAP) staining method.
- Analysis of human retinas from 9 to 31 gestational weeks.
Main Results:
- No MAG staining was observed in Müller cells of retinas between 9-12 gestational weeks.
- Faint MAG staining appeared in Müller cells around 13-16 gestational weeks, primarily in the inner retina and near the optic nerve head.
- After midterm, Müller cells consistently stained for MAG throughout all retinal layers, with gradually increasing intensity up to 23 gestational weeks.
Conclusions:
- Myelin-associated glycoprotein (MAG) is expressed in human Müller cells during the second trimester of gestation.
- MAG expression in Müller cells follows a specific developmental timeline, increasing significantly by mid-gestation.