Abstract
We have examined the regional distribution of several chondroitin sulfate proteoglycans (neurocan, brevican, versican, aggrecan, phosphacan), of their glycosaminoglycan moieties, and of tenascin-R in the spinal cord of adult rat. The relationships of these molecules with glial and neuronal populations, identified with appropriate markers, were investigated by using multiple fluorescence labeling combined with confocal microscopy. The results showed that the distribution of the examined molecules was similar at all spinal cord levels but displayed area-specific differences along the dorso-ventral axis, delimiting functionally and developmentally distinct areas. In the gray matter, laminae I and II lacked perineuronal nets (PNNs) of extracellular matrix and contained low levels of chondroitin sulfate glycosaminoglycans (CS-GAGs), brevican, and tenascin-R, possibly favoring the maintenance of local neuroplastic properties. Conversely, CS-GAGs, brevican, and phosphacan were abundant, with numerous thick PNNs, in laminae III-VIII and X. Motor neurons (lamina IX) were surrounded by PNNs that contained all molecules investigated but displayed various amounts of CS-GAGs. Double-labeling experiments showed that the presence of PNNs could not be unequivocally related to specific classes of neurons, such as motor neurons or interneurons identified by their expression of calcium-binding proteins (parvalbumin, calbindin, calretinin). However, a good correlation was found between PNNs rich in CS-GAGs and the neuronal expression of the Kv3.1b subunit of the potassium channel, a marker of fast-firing neurons. This observation confirms the correlation between the electrophysiological properties of these neurons and the specific composition of their microenvironment.
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Confocal microscopy was carried out at the Centro Interdipartimentale di Microscopia Avanzata (CIMA) of the University of Milan. The phosphacan/RPTPζ/β monoclonal antibodies (3F8, 3H1 and 2B49) and the versican (12C5) monoclonal antibody were obtained from the Developmental Studies Hybridoma Bank.
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This paper is dedicated to Prof. Aurelio Bairati on the occasion of his retirement from his professorship at the University of Milan.
This work was supported by grants from the Italian Ministry of Education, University and Research (COFIN 03 and 05) and the University of Milan (FIRST).
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Vitellaro-Zuccarello, L., Bosisio, P., Mazzetti, S. et al. Differential expression of several molecules of the extracellular matrix in functionally and developmentally distinct regions of rat spinal cord. Cell Tissue Res 327, 433–447 (2007). https://doi.org/10.1007/s00441-006-0289-y
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DOI: https://doi.org/10.1007/s00441-006-0289-y