Abstract
The constitutive expression of heat shock protein 108 (HSP108) mRNA is mapped in a normal chicken central nervous system using in situ hybridization technique. HSP108 mRNAs were found to be mainly localized in the small neuroglial cells of various regions of the brain, although some neuronal cells also showed positive signals. This tendency is observed to be more marked in the cerebellum; HSP108 signals were not found in the Purkinje cells, but in Bergmann glial cells and oligodendrocytes. Although neuronal cells in the deep cerebellar nuclei and the molecular layer showed occasional HSP108 signals, the expression pattern of HSP108 mRNA is different from homologous HSP90 that is mostly expressed in neurons, but rather similar to that of TfBP immunoreactivity, a new member of the HSP108 family. The constitutive neuroglial localization of HSP108 could suggest that HSP108 may play an important role in the normal metabolism of neuroglial cells in the chicken brain.
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