Central Nervous System and Vertebrae Development in Horses: a Chronological Study with Differential Temporal Expression of Nestin and GFAP
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The neural system is one of the earliest systems to develop and the last to be fully developed after birth. This study presents a detailed description of organogenesis of the central nervous system (CNS) at equine embryonic/fetal development between 19 and 115 days of pregnancy. The expression of two important biomarkers in the main structure of the nervous system responsible for neurogenesis in the adult individual, and in the choroid plexus, was demonstrated by Nestin and glial fibrillary acid protein (GFAP) co-labeling. In the 29th day of pregnancy in the undifferentiated lateral ventricle wall, the presence of many cells expressing Nestin and few expressing GFAP was observed. After the differentiation of the lateral ventricle wall zones at 60 days of pregnancy, the subventricular zone, which initially had greater number of Nestin+ cells, began to show higher numbers of GFAP+ cells at 90 days of pregnancy. A similar pattern was observed for Nestin+ and GFAP+ cells during development of the choroid plexus. This study demonstrates, for the first time, detailed chronological aspects of the equine central nervous system organogenesis associated with downregulation of Nestin and upregulation of GFAP expression.
KeywordsNeurodevelopment Equine Fetal brain development Spinal cord Nerves Ganglia Head trauma
The authors are grateful to Andre L. R. Franciolli for producing some pictures and to Rosangela F. Rodrigues, Márcio N. Rodrigues, and Rafael C. Carvalho for helping during processing of the collected materials.
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflicts of interests.
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