Journal
CELLULAR AND MOLECULAR NEUROBIOLOGY
Volume 32, Issue 8, Pages 1265-1273Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10571-012-9851-1
Keywords
Osteocalcin; Osteopontin; Brain stem; Cerebellum; Immunohistochemistry; Rat
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Funding
- Grants-in-Aid for Scientific Research [24890021] Funding Source: KAKEN
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Immunohistochemistry for osteocalcin (OC) and osteopontin (OPN) was performed to know their distributions in the hind brain of adult rats. OC- and OPN-immunoreactivity (-ir) were detected in neuronal cell bodies, including perikarya and proximal dendrites and the neuropil. In the cranial nerve motor nuclei, numerous OC- and OPN-immunoreactive (-ir) neurons were detected. The neuropil in the cranial motor nuclei mostly showed strong OC- and OPN-staining intensity. The cranial nerve sensory nuclei and other relay and modulating structures in the lower brain stem also contained various numbers of OC- and OPN-ir neurons. The staining intensities in the neuropil were varied among these regions. In the cerebellar cortex, Purkinje cells and granule cells showed OPN-ir but not OC-ir. However, OC- and OPN-ir neurons were abundantly distributed throughout the cerebellar nuclei. The neuropil in the cerebellar nuclei showed moderate OC-ir and strong OPN-ir staining intensities. These findings indicate that the distribution patterns of OC- and OPN-ir neurons were similar in many structures within the hind brain. OC may play a role in modulating neuroprotective function of OPN.
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