Abstract
This light-microscopic (LM) immunohistochemical study has evaluated the presence and distribution of the pan-neural and neuroendocrine marker protein gene product (PGP) 9.5 in pinealocytes and nerve fibres of guinea-pig pineal gland. The pattern of PGP 9.5-immunoreactive (ir) nerve fibres has been compared with that of fibres staining for tyrosine hydroxylase (TH) or neuropeptide Y (NPY). The vast majority of pinealocytes stained for PGP 9.5, although with variable intensity. PGP 9.5 immunoreactivity was localized in pinealocytic cell bodies and processes. Double-immunofluorescence revealed that PGP 9.5 immunoreactivity was absent from glial cells identified with a monoclonal antibody against glial fibrillary acidic protein (GFAP), PGP 9.5 immunoreactivity was also present in a large number of nerve fibres and varicosities distributed throughout the pineal gland. The number of TH-ir and NPY-ir nerve fibres was lower compared with those containing PGP 9.5 immunoreactivity. All fibres staining for NPY also stained for TH. NPY-ir nerve fibres were found to be much more numerous than previously reported for this species. The double-immunofluorescence analysis indicated that almost all TH-ir nerve fibres of the pineal gland contained PGP 9.5 immunoreactivity. However, few PGP 9.5-ir nerve fibres, located in the periphery and the central part of the gland, were TH-negative. A large number of PGP 9.5-ir fibres was concentrated in the pineal stalk. In contrast, TH-ir and NPY-ir nerve fibres were rare in this part of the pineal gland. Our data provide evidence that immunohistochemistry for PGP 9.5 may be a useful tool further to differentiate central and peripheral origins of pineal innervation. Furthermore, the staining of pinealocytes for PGP 9.5 may be exploited to study the three-dimensional morphology and the architecture of pinealocytes and their processes under various experimental conditions.
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Romeo, H.E., Weihe, E., Müller, S. et al. Protein gene product (PGP) 9.5 immunoreactivity in nerve fibres and pinealocytes of guinea-pig pineal gland: interrelationship with tyrosine-hydroxylase- and neuropeptide-Y-immunoreactive nerve fibres. Cell Tissue Res 271, 477–484 (1993). https://doi.org/10.1007/BF02913730
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DOI: https://doi.org/10.1007/BF02913730