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Immunoreactivities of calbindin‑D28k, calretinin and parvalbumin in the somatosensory cortex of rodents during normal aging.
Molecular Medicine Reports 2017 November
Calbindin‑D28k (CB), calretinin (CR) and parvalbumin (PV), which regulate cytosolic free Ca2+ concentrations in neurons, are chemically expressed in γ‑aminobutyric acid (GABA)ergic neurons that regulate the degree of glutamatergic excitation and output of projection neurons. The present study investigated age‑associated differences in CB, CR and PV immunoreactivities in the somatosensory cortex in three species (mice, rats and gerbils) of young (1 month), adult (6 months) and aged (24 months) rodents, using immunohistochemistry and western blotting. Abundant CB‑immunoreactive neurons were distributed in layers II and III, and age‑associated alterations in their number were different according to the species. CR‑immunoreactive neurons were not abundant in all layers; however, the number of CR‑immunoreactive neurons was the highest in all adult species. Many PV‑immunoreactive neurons were identified in all layers, particularly in layers II and III, and they increased in all layers with age in all species. The present study demonstrated that the distribution pattern of CB‑, CR‑ and PV‑containing neurons in the somatosensory cortex were apparently altered in number with normal aging, and that CB and CR exhibited a tendency to decrease in aged rodents, whereas PV tended to increase with age. These results indicate that CB, CR and PV are markedly altered in the somatosensory cortex, and this change may be associated with normal aging. These findings may aid the elucidation of the mechanisms of aging and geriatric disease.
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