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Cytological organization of the central gelatinosa in the turtle spinal cord
Author(s) -
TrujilloCenóz Omar,
Fernández Anabel,
Radmilovich Milka,
Reali Cecilia,
Russo Raúl E.
Publication year - 2007
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.21306
Subject(s) - biology , spinal cord , neuroepithelial cell , anatomy , cilium , microbiology and biotechnology , neuroscience , ultrastructure , stem cell , neural stem cell
This paper deals with the cytological organization of the central gelatinosa (CG) in the spinal cord of juvenile (2–12 months) turtles. We found two main cell classes in the CG: one with characteristics of immature neurons, the other identified as radial glia (RG). The cells surrounding the central canal formed radial conglomerates in such a way that the RG lamellae covered the immature neurons. We found three major subpopulations of RG that expressed S‐100, glial fibrillary acidic protein, or both proteins. Electron microscopic images showed gap junctions interconnecting RG. As with the mammalian neuroepithelial cells, most CG cells displayed intrinsic polarity expressed by structural and molecular differences between the most apical and basal cell compartments. The apical zone was characterized by the occurrence of a single cilium associated with a conspicuous centrosomal complex. We found a prominent expression of the PCM‐1 centrosomal protein concentrated close to the central canal lumen. In the particular case of RG, the peripheral end feet contacted the subpial basement membrane. We also found “transitional cell forms” difficult to classify by the usual imaging approaches. Functional clues obtained by patch‐clamp recordings of CG cells defined some of them as already committed to follow the neuronal lineage, whereas others had properties of less mature or migrating cells. The CG appeared as a richly innervated region receiving terminal branches from nerve plexuses expressing γ‐aminobutyric acid, serotonin, and glutamate. The results presented here support our previous studies indicating that the CG is an extended neurogenic niche along the spinal cord of turtles. J. Comp. Neurol. 502:291–308, 2007. © 2007 Wiley‐Liss, Inc.