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GABA(Abeta2-3) immunoreactive cells in the developing chick retina
Pedro Henrique Oliveira Cavalcanti Barros1, Karin da Costa Calaza, Patrícia Franca Gardino
1Lab. Neurobiologia da Retina, Depto Neurobiologia, Instituto de Biofísica Carlos Chagas Filho, Cidade Universitária, CCS, Bloco G, UFRJ, RJ 21949-900, Rio de Janeiro, Brazil.
Summary
The study reveals that GABA(Abeta2-3) expression in chick retina cells begins after their generation period, with cell bodies appearing at embryonic day 14. This finding is crucial for understanding GABAergic system development.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- Gama-aminobutyric acid (GABA) is a key inhibitory neurotransmitter in the central nervous system (CNS).
- GABAergic functions, primarily mediated by GABA(A) receptors, are vital for CNS maturation.
- Understanding the developmental trajectory of GABA(A) receptor subunits is essential for comprehending GABA's role during development.
Purpose of the Study:
- To investigate the ontogenesis and neurogenesis of cells expressing beta2-3 subunits of GABA(A) receptor (GABA(Abeta2-3)) in the developing chick retina.
- To establish the temporal relationship between GABA(Abeta2-3) cell generation and the appearance of GABA(Abeta2-3) immunoreactivity.
Main Methods:
- Ontogenesis was studied using immunohistochemistry for GABA(Abeta2-3).
- Neurogenesis was assessed via a double-labeling method combining [H(3)]-thymidine autoradiography and GABA(Abeta2-3) immunohistochemistry.
- Cumulative counting of autoradiographic grains quantified cell generation rates.
Main Results:
- GABA(Abeta2-3) immunoreactivity was initially confined to the inner plexiform layer at embryonic day 9 (E9).
- The first GABA(Abeta2-3) immunoreactive cell bodies were observed at E14, with increasing cell numbers and immunoreactivity intensity thereafter.
- Cells expressing GABA(Abeta2-3) were generated between E6 and E9, with a rapid increase in neurogenesis rate from E7 to E9.
Conclusions:
- GABA(Abeta2-3) detection in the chick retina occurs after the neurogenesis period for these cells is complete.
- This study provides critical insights into the developmental timeline of GABAergic signaling in the retina.