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Variable expression of intermediate filament proteins during embryonic development of human optic nerve
Experimental Neurology
|October 1, 1985
Summary
Human optic nerve development shows a shift from vimentin to glial fibrillary acidic protein (GFAP) dominance. Neurofilament proteins appear late, and GFAP/vimentin ratios change during development and in pathological conditions.
Area of Science:
- Neuroscience
- Developmental Biology
- Biochemistry
Background:
- Intermediate filament proteins are crucial for neuronal structure and function.
- The human optic nerve and tract undergo significant developmental changes in protein composition.
Purpose of the Study:
- To analyze the intermediate filament protein composition during human optic nerve and tract development.
- To compare developmental changes with adult tissue and pathological conditions.
Main Methods:
- Two-dimensional gel electrophoresis was used to analyze protein composition.
- Immunoblotting with antibodies against glial fibrillary acidic protein (GFAP) and vimentin visualized specific proteins.
- Proteins were analyzed at various embryonic stages (15-24 weeks) and in adult tissue.
Main Results:
- Vimentin was predominant at 15 weeks, with GFAP increasing significantly by adulthood.
- Neurofilament proteins (70K and 150K) were first observed at 24 weeks.
- GFAP to vimentin ratio was higher in the optic tract than the optic nerve during development, equalizing in adults. Pathological axonal loss showed complete neurofilament loss, with unchanged GFAP/vimentin levels.
Conclusions:
- The study elucidates the dynamic changes in intermediate filament protein expression during human optic nerve development.
- Developmental shifts in GFAP and vimentin reflect maturation processes.
- Neurofilament protein presence correlates with axonal integrity, while GFAP and vimentin levels remain stable in pathological axonal loss.