Abstract
Among recent vertebrates only birds possess a glycogen body (corpus gelatinosum), located in the rhomboidal sinus of the lumbosacral region of the spinal cord and separated from the neural tissue proper. Because of the specific topographical situation of this circumventricular organ, the structure of its vascular system is of special interest with respect to the still unsolved functional problems. The existence of a blood-brain barrier is demonstrated by the exclusion of intravascularly injected tracer (horseradish peroxidase), and immunocytochemical demonstration of glucose transporter-1 as a functional marker and of neurothelin, occludin and ZO-1 as structural markers. Alkaline phosphatase and γ-glutamyltransferase activities, two enzyme reactions frequently used for demonstration of an established blood-brain barrier in vitro, were localized histochemically on the plasmalemma of glycogen body cells and were absent from the endothelium. In addition, local enlargements of the intercellular space were observed by transmission and scanning electron microscopy. In accordance with the concept of a third circulation the cerebrospinal fluid may be the vehicle for distributing substances originating in the glycogen body to the CNS, while the vascular endothelium maintains the internal milieu by virtue of its dynamic barrier functions.
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Acknowledgements
The authors thank Dr. B. Schlosshauer, Tübingen, Germany, for kindly supplying the monoclonal neurothelin antibody, and Dr. M. Furuse, Kyoto, Japan, for supplying the monoclonal antibodies OC1 and OC2. The skillful technical assistance of G. Möller, E. Richter, S. Wiegand, K. Michael, G. Magdowski and G. Kripp is gratefully acknowledged.
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Möller, W., Kummer, W. The blood-brain barrier of the chick glycogen body (corpus gelatinosum) and its functional implications. Cell Tissue Res 313, 71–80 (2003). https://doi.org/10.1007/s00441-003-0742-0
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DOI: https://doi.org/10.1007/s00441-003-0742-0