Abstract
Central complex modules in the postembryonic brain of the grasshopper Schistocerca gregaria are enveloped by Repo-positive/glutamine-synthetase-positive astrocyte-like glia. Such cells constitute Rind-Neuropil Interface glia. We have investigated the postembryonic development of these glia and their anatomical relationship to axons originating from the w, x, y, z tract system of the pars intercerebralis. Based on glutamine synthetase immunolabeling, we have identified four morphological types of cells: bipolar type 1 glia delimit the central body but only innervate its neuropil superficially; monopolar type 2 glia have a more columnar morphology and direct numerous gliopodia into the neuropil where they arborize extensively; monopolar type 3 glia are found predominantly in the region between the noduli and the central body and have a dendritic morphology and their gliopodia project deeply into the central body neuropil where they arborize extensively; multipolar type 4 glia link the central body neuropil with neighboring neuropils of the protocerebrum. These glia occupy type-specific distributions around the central body. Their gliopodia develop late in embryogenesis, elongate and generally become denser during subsequent postembryonic development. Gliopodia from putatively type 3 glia within the central body have been shown to lie closely apposed to individual axons of identified columnar fiber bundles from the w, x, y, z tract system of the central complex. This anatomical association might offer a substrate for neuron/glia interactions mediating postembryonic maturation of the central complex.
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Acknowledgments
We thank M. Loser for assistance with GS immunolabeling, Dr. Yu Liu for critical comments on the manuscript and Karin Fischer for excellent technical assistance.
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This work was supported by the Deutsche Forschungsgemeinschaft (BO 1434/3-5).
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Supplemetary Fig. 1
Reproducibility of data (arrow with V ventral). Confocal images of horizontal brain slices at the level of the central body (CB; outlined by a dashed white line) in three adult preparations (a–c) following glutamine synthetase (GS) immunolabling reveal consistent morphology of RNI types 1, 2 and 4 astrocyte-like glia (open/white arrowheads). Bar 46 μm (JPEG 41 kb)
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Boyan, G., Williams, L. & Götz, S. Postembryonic development of astrocyte-like glia of the central complex in the grasshopper Schistocerca gregaria . Cell Tissue Res 351, 361–372 (2013). https://doi.org/10.1007/s00441-012-1535-0
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DOI: https://doi.org/10.1007/s00441-012-1535-0