Subclasses of oligodendrocytes populate the mouse hippocampus

The European Journal of Neuroscience
Jonathan VinetAttila Sík

Abstract

Oligodendrocytes are the myelin-forming cells of the central nervous system that facilitate transmission of axonal electrical impulses. Using transgenic mice expressing 2',3' cyclic nucleotide 3' phosphodiesterase (CNPase)-enhanced green fluorescent protein, a three-dimensional reconstruction tool and analysis, we illustrate that three morphologically different oligodendrocyte types exist in the hippocampus. Those of the ramified type have the most numerous processes, the largest cell body, occupy the largest area and form beaded-like structures, due to mitochondria aggregates, along the processes. Stellar-shaped oligodendrocytes have smaller cell bodies and their processes cover a significantly smaller area. Those of the smooth subtype have a small cell body with at most two processes. In addition to these types, a large number of oligodendrocytes were found that faintly express CNPase-enhanced green fluorescent protein. More than 50% of the faint type colocalized with NG2 and 91% with oligodendrocyte transcription factor-2, whereas 94% of NG2-immunoreactive and 45% of oligodendrocyte transcription factor-2-immunoreactive cells were faintly CNPase-enhanced green fluorescent protein positive. Based on the complexity of the over...Continue Reading

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